| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 342159000 | CLUTTER ELIMINATION | 64 |
| 20080231500 | Receiving method and receiver - There is provided a receiver comprising: an estimator configured to estimate an initial noise-plus-interference covariance matrix on the basis of a received signal; a calculator configured to calculate a parameter using the received signal; and a calculator configured to decrease magnitude of off-diagonal values of the estimated initial covariance matrix relative to diagonal values of the same matrix based on the calculated parameter in order to estimate a final noise-plus-interference covariance matrix. | 09-25-2008 |
| 20080284640 | Polarimetric Selectivity Method for Suppressing Cross-Track Clutter in Sounding Radars - Methods for suppressing cross-track clutter in a sounding radar utilize polarimetric selectivity in two ways: (1) transmitting full-beam circular polarization and separating the desired signal of interest from the clutter based on the signal and clutter having different polarizations, and (2) transmitting and receiving circular polarization at the radar's nadir and elliptical polarization at the radar's off-nadir regions and filtering out the elliptical polarization. | 11-20-2008 |
| 20090027257 | SYSTEM AND METHOD FOR DETECTION AND DISCRIMINATION OF TARGETS IN THE PRESENCE OF INTERFERENCE - Systems and method of detection and discrimination of targets in the presence of interference are disclosed. A system transmits a signal and then receives signals including interference and reflections of transmitted signals. The system processes the received signals and transmitted signals to generate a 2D representation of the STAP cube with one of the dimensions collapsed. The system then reduces the interference contributions and identifies angle and Doppler component of potential targets. The system then computes slices, which are one dimensional representation of cross-ambiguity functions of the received and transmitted signals. It reduces the interference contributions in the slices and determines range components of the targets. | 01-29-2009 |
| 20090121918 | RADAR APPARATUS ENABLING SIMPLIFIED SUPPRESSION OF INTERFERENCE SIGNAL COMPONENTS WHICH RESULT FROM RECEPTION OF DIRECTLY TRANSMITTED RADAR WAVES FROM ANOTHER RADAR APPARATUS - In a FM-CW or CW radar apparatus, when interference components are Contained in channel signals obtained as beat signals from array antenna elements of respective channels, and the interference components result from directly receiving transmitted CW radar waves from an external source, phase shifting is applied to each of the channel signals to shift respective phases of the interference components of the respective channels to a condition corresponding to reception of interference waves from a predetermined direction. The interference components are then eliminated, and reverse phase shifting is applied to restore remaining components of the channel signals to their original phase condition. | 05-14-2009 |
| 20090237294 | WEIGHT CALCULATION METHOD, WEIGHT CALCULATION DEVICE, ADAPTIVE ARRAY ANTENNA, AND RADAR DEVICE - A received data storage situation is monitored, and a covariance matrix R | 09-24-2009 |
| 20090303109 | METHOD FOR FILTERING SEA CLUTTER IN A RADAR ECHO USING A HYDROGRAPHIC MODEL - There is disclosed a method for filtering sea clutter in a radar echo using a hydrographic model. The method comprises the steps of determining parameter values of the hydrographic model using the radar echo, estimating the sea clutter corresponding to the sea surface as deduced from the hydrographic model and filtering of the estimated sea clutter from the radar echo. | 12-10-2009 |
| 20100026559 | SYSTEM FOR ENHANCED DETECTION OF A TARGET - A method for discrimination of a target from clutter, comprising: providing phase-range data associated with a return pulse of a radar device and second phase-range data associated with a subsequent return pulse; comparing the phase-range data and the second phase-range data to obtain a difference; differentiating the differences with respect to range; and discriminating the target from the clutter by identifying coordinates from the differentiated differences satisfying velocity thresholds associated with the clutter. In one embodiment, the subsequent return pulse is drawn after skipping one or more pulses after the return pulse. In another embodiment, the subsequent return pulse is drawn successive to the return pulse. In other aspects, the invention can be a detection system and/or computer-readable medium adapted implement the method. | 02-04-2010 |
| 20100090884 | GAUSSIAN MODEL ADAPTIVE PROCESSING IN THE TIME DOMAIN - Embodiments of the present invention provide a Gaussian adaptive filter for ground clutter filtering and signal parameter estimation for weather radars in the time domain. In some embodiments, the filtering can be applied to dual polarization radar systems. In some embodiments, the clutter component of the signal can be transformed to noise. An interpolation procedure can then be used to recover the transformed part of the weather. A unique filter can be designed to use for both H and V channels for dual-polarization parameter estimation. In addition, the filter can be directly extended for staggered PRT 2/3 sampling scheme. | 04-15-2010 |
| 20100134345 | METHOD FOR FILTERING A RADAR SIGNAL AFTER IT HAS BEEN REFLECTED BY A TARGET - There is disclosed a method for filtering a signal y, the signal y being the reflection of a signal s emitted by a radar, the signal s having been reflected by a target. | 06-03-2010 |
| 20100176984 | METHOD OF ELIMINATING GROUND ECHOES FOR A METEOROLOGICAL RADAR - The present invention relates to a method of eliminating ground echoes for a meteorological radar. The ground echoes being received from a predetermined area by a radar, the radar illuminating, for a predetermined number R of transmission recurrences, the area over a number P of distance cells, the method includes a step for calculating a spatial statistical parameter of the cluttered echoes received by the radar in response to the recurrences over an analysis path for distance cells, and a step to compare the spatial variation level of the spatial statistical parameter along the analysis path, the echoes being considered to be ground echoes when the level of said variation is greater than a predetermined threshold. | 07-15-2010 |
| 20100201564 | REMOVING CLUTTER FROM RADAR CROSS SECTION MEASUREMENTS USING SPECTRAL TAGGING - A system for performing radar cross section measurements of a target may include a radar system and an antenna associated with the radar system to transmit signals and to receive reflected signals from the target and a clutter source. An EM tagging device is locatable proximate to the clutter source to spectrally tag the clutter source by causing changes in an electromagnetic signal reflected by the clutter source when a predetermined radar signal transmitted by the radar system is incident on the target, the clutter source and the EM tagging device. A module may identify a spectrally tagged component of reflected signals received by the radar system from the target, the clutter source and the EM tagging device. The module monitors the spectrally tagged component, compensates for variations in an un-tagged component of the reflected signals caused by the clutter source and EM tagging device, and subtracts contamination caused by the clutter source and EM tagging device and their interactions with the target, to provide a radar cross section of the target with reflected signals from the clutter source removed. | 08-12-2010 |
| 20100277362 | RADAR DETECTION METHOD AND APPARATUS USING THE SAME - A method for detecting radar signal comprises the steps of: receiving a signal by a receiver, wherein the strength of the received signal is controlled within a range; sampling the received signal so as to obtain a plurality of sampling values; dividing the sampling values into a plurality of segments; summing up the absolute values of the sampling values in each segment; and determining that the received signal includes radar signals if at least one summation is greater than a threshold. | 11-04-2010 |
| 20100283664 | SELECTIVE-SAMPLING RECEIVER - A receiver that selectively samples a received signal in order to suppress an interference component of the signal while recovering a desired component. The selective sampling may be accomplished by low cost, low complex analog or digital circuitry. The receiver includes a first input that receives a first signal, including a desired signal component and an interference signal component and a second input that receives a second signal including the interference component only. The first and second signals are then provided to the sampling circuitry. First, the phase of the interference component of the both the first and second signals is aligned. Next, the points in a wave cycle that the second signal is at a power minimum are detected. Finally, first signal is sampled close to the point when the second signal is at the power minimum to recover the desired signal component and suppress the interference component. | 11-11-2010 |
| 20110063161 | DUAL POLARIZATION RADAR APPARATUS AND INTERFERENCE JUDGMENT METHOD - According to one embodiment, a dual polarization radar apparatus includes a received power calculation unit configured to calculate a horizontal polarization received power and a vertical polarization received power, the horizontal polarization received power indicating a power value of a horizontal polarization received signal reflected from an observation target, the vertical polarization received power indicating a power value of a vertical polarization received signal reflected from the observation target, a power ratio calculation unit configured to calculate a power ratio between the horizontal polarization received power and the vertical polarization received power, and an interference judgment unit configured to judge that an interference signal is mixed to the horizontal polarization received signal or the vertical polarization received signal when the power ratio is greater than a predetermined threshold value. | 03-17-2011 |
| 20110102246 | Noise-canceling down-converting detector - A detector system has a first detector configured to detect a first high-frequency signal having amplitude-modulated (“AM”) noise to produce a first detected signal having at least a first detected AM noise signal component and a demodulated signal component and a second detector configured to detect a second high-frequency signal having the AM noise to produce a second detected signal having at least a second detected AM noise signal component. An algebraic combining network combines the first detected signal and the second detected signal to cancel the first detected AM noise signal component with the second detected AM noise signal component to produce an output signal including the demodulated signal component. | 05-05-2011 |
| 20110102247 | Adaptive Clutter Filter for Maritime Surface Search Radar - A time sequence of raw radar data for a region of space is subdivided into a plurality of processing frames. The processing frames are subdivided into a plurality of processing cells and iteratively processed by selecting a single processing cell for processing, transforming the radar data of the processing cell to form transformed radar data in either the time domain or the Fourier domain. The transformed data is converted to a Power Spectrum Density Matrix in the case of the Fourier domain and a Time Space Correlation Matrix in the case of the time domain. This is smoothed and thresholded and then the clutter for the processing cell is estimated. Estimated local non-speckle clutter is estimated and removed from the transformed radar data, with the cleaned transformed radar data converted back to the time domain if required. | 05-05-2011 |
| 20110187584 | Method for Suppressing Clutter in Space-Time Adaptive Processing Systems - A method surpresses clutter in a space-time adaptive processing system. The method achieves low-complexity computation via two steps. First, the method utilizes an improved fast approximated power iteration method to compress the data into a much smaller subspace. To further reduce the computational complexity, a progressive singular value decomposition (SVD) approach is employed to update the inverse of the covariance matrix of the compressed data. As a result, the proposed low-complexity STAP procedure can achieve near-optimal performance with order-of-magnitude computational complexity reduction as compared to the conventional STAP procedure. | 08-04-2011 |
| 20110241931 | ITERATIVE CLUTTER CALIBRATION WITH PHASED ARRAY ANTENNAS - An iterative clutter calibration method comprises measuring an average of a sidelobe power in a range-Doppler image for a plurality of ranges. A determined value of an objective function is responsive to an average of the sidelobe clutter power. A plurality of beamformer weights is modified and the step of determining the value of the objective function is repeated until a maximum value of the objective function is determined. Each beamformer weight determines a gain and phase of a respective antenna element in an antenna system. | 10-06-2011 |
| 20110291877 | METHODS AND APPARATUS FOR NON-ISOTROPIC SEA CLUTTER MODELING - Methods and apparatus to provide computing, using a processor, sea clutter threshold bias values as a function of range and azimuth, receiving a first shape corresponding to a first region of sea clutter about a radar, combining the sea clutter threshold bias values with the first shape to provide non-isotropic sensitivity time control (STC) for the radar, and outputting radar return for display with sea clutter suppressed in the first shape. | 12-01-2011 |
| 20120026031 | Method and System for Continuous Wave Interference Suppression in Pulsed Signal Processing - A System and Method for CW interference suppression in pulsed signal processing having a front-end, an A/D converter, a data store, and a suppressor module coupled to both the A/D converter and the data store. The front-end is operable to receive a waveform and communicate such to the A/D converter to digitize for processing by the suppressor module. The suppressor module being operable to further process the digitized waveform by way of applying a FFT to obtain a corresponding amplitude spectrum of the digitized waveform, clipping the amplitude spectrum to obtain a clipped amplitude spectrum, performing successive piece-wise IFFTs on the positive frequency points of the clipped amplitude spectrum to obtain multiple amplitude-time series, each having a frequency value assigned, and then stacking such amplitude-time series successively in the data store to form a time-frequency spectrogram array to thereby facilitate suppression of interference signals and detection of data pulses. | 02-02-2012 |
| 20120098695 | ANTENNA ARRANGEMENT - An antenna has multiple antenna elements, with a beam forming Butler matrix, having antenna ports and input/output ports, with each of said antenna elements being connected to a respective port of the beam forming Butler matrix. Transceiver circuitry is connected to each of the input/output ports of the beam forming matrix by means of respective distinct transmit and receive paths and a respective duplexer. Individually controllable gain control elements are located in each of the transmit and receive paths. These can be controlled in response to signal strength measurements made by the antenna. | 04-26-2012 |
| 20120105272 | METHOD FOR FILTERING THE RADAR ECHOES PRODUCED BY WIND TURBINES - In the field of the radar monitoring of airspace zones, and more particularly to the low altitude air surveillance of zones that are more or less densely populated with fixed objects comprising moving parts, such as wind turbines for example, two processing modules are applied to the raw signal S | 05-03-2012 |
| 20120112955 | METHOD OF DETERMINING THRESHOLD FOR DETECTION OF PEAK FREQUENCY IN RADAR AND OBJECT INFORMATION PRODUCING APPARATUS USING THE SAME - A peak detecting threshold determining method is provided which determines a peak detecting threshold which is used by an FMCW radar in detecting a peak frequency component which appears as representing a target object in a frequency spectrum. A CW radar wave is transmitted to produce a CW noise spectrum. An offset is added to frequency components in a high-frequency region of the CW noise spectrum to define a first distribution as a value of the peak detecting threshold. This enables the value of the peak detecting threshold in the high-frequency region to be determined with high precision by reflecting a receiver noise containing a leakage noise. | 05-10-2012 |
| 20120154204 | METHODS AND APPARATUS FOR SEA STATE MEASUREMENT VIA RADAR SEA CLUTTER ECCENTRICITY - Methods and apparatus to fit the range extent of radar sea clutter to an ellipse to determine sea state. From one or more ellipse parameters, a sea state, which can include direction, can be identified. In one embodiment, the system autonomously determines the sea state and automatically selects non-isotropic STC filtering based on the ellipse that measures the sea state. | 06-21-2012 |
| 20120242536 | DOPPLER RADAR SYSTEM HAVING A HIGH PHASE NOISE TRANSMITTER - Disclosed herein are systems and methods for using high phase noise oscillators in Doppler radar systems. In some embodiments, a transmit pulse is sampled corresponding with a transmission time, and a phase noise correction factor is developed based on the sample transmit pulse and corresponding with the transmission time. A return echo is received that corresponds with the transmission time of the transmit pulse, and the return echo is modified based on the phase noise correction factor derived from the corresponding transmit pulse. In some embodiments, the transmit pulse can be generated from a magnetron or other high power oscillator having high phase noise. In some embodiments, the modified return echo is processed to differentiate clutter by resolving a Doppler shift. | 09-27-2012 |
| 20120249361 | Method for Detecting Targets Using Space-Time Adaptive Processing - A method for detecting a target in a non-homogeneous environment using a space-time adaptive processing of a radar signal includes normalizing training data of the non-homogeneous environment to produce normalized training data; determining a normalized sample covariance matrix representing the normalized training data; tracking a subspace represented by the normalized sample covariance matrix to produce a clutter subspace matrix; determining a test statistic representing a likelihood of a presence of the target in the radar signal based on the clutter subspace matrix and a steering vector; and comparing the test statistic with a threshold to detect the target. | 10-04-2012 |
| 20120280854 | SIGNAL PROCESSING SYSTEM AND METHOD - An FMCW radar system includes received signal processing arranged to apply multiple window functions in parallel to a received beat signal including at least one window function having a narrower main-lobe in its frequency response than at least one other window function and said at least one other window function having relatively higher side-lobe attenuation in its frequency response, transform the output of the multiple window functions from the time domain to the frequency domain, and combine the outputs of the transforms for further processing. Both narrow frequency resolution and thus good range discrimination, and also good side-lobe attenuation to avoid close interference are achieved. | 11-08-2012 |
| 20120280855 | Detector system with adjustable phase stage - A detector system has a local oscillator port, a radio frequency port, and an oscillator providing a local oscillator signal having amplitude-modulated (“AM”) noise coupled. A first detector detects the local oscillator signal and produces a first detected signal having a first detected AM noise signal component and a demodulated signal component at a first phase. A second detector detects a second high-frequency signal to produce a second detected signal having a second detected AM noise signal component at a second phase. An algebraic combining network combines the first detected signal and the second detected signal to produce a demodulated signal component at an output. A phase delay disposed between the local oscillator and the output of the algebraic combining network is calibrated to offset the first phase from the second phase to improve signal-to-noise ratio at the output. | 11-08-2012 |
| 20120293361 | RADAR CLUTTER SUPPRESSION SYSTEM - Sidelobe suppression methods and systems for use in processing radar video streams generated by rotational radar antenna scanners. The sidelobe suppression methods function in parallel with traditional Sensitivity Control (SC) processing by selectively reducing sensitivity where necessary depending on sidelobe suppression schemes that can be either directional, omni-directional (non-directional), or a combination of these. | 11-22-2012 |
| 20120313813 | Direct-to-Digital Software-Defined Radar - A direct-to-digital software defined radar system includes a high-speed digitizer coupled directly to a receive antenna and outputs a digital signal to a processor which receives the digitized signal, along with an arbitrarily-defined reference signal provided by signal generator, and indexes the signal data according to time and geo-location, arranges the data according to a three-dimensional data structure, declutters and filters and refines the data for storage or display. | 12-13-2012 |
| 20120326919 | RADAR SENSOR HAVING INTERFERENCE SIGNAL COMPENSATION - Radar sensor having a mixer for mixing a received signal with a reference signal and having a device for compensating interference signals which would overload the mixer, wherein the device for compensating the interference signals has an adjustable reflection point at the reference input of the mixer. | 12-27-2012 |
| 20130016002 | METHOD OF DETECTING A CLUTTER RETURN AT A SENSORAANM Edwards; Philip TrevelyanAACI NewportAACO GBAAGP Edwards; Philip Trevelyan Newport GB - There is disclosed a method for counteracting the effect which crags and other such environmental formations can have on radar returns or returns in similar sensor systems. In particular it has been found that the gaps between crags can lead to false detections because of firstly the function of certain signal processors which compare the high frequency return from a certain cell to a low frequency return from that cell, and secondly the effect of smearing of the returns from one cell to another. The invention seeks to mitigate this effect by selecting the maximum low frequency return from a group of range cells as the high frequency offset. | 01-17-2013 |
| 20130021196 | FMCW RADAR SYSTEM AND INTERFERENCE RECOGNITION METHOD FOR FMCW RADAR SYSTEMS - An FMCW radar system is provided having a transceiver unit which is designed to transmit radar signals, which are modulated with the aid of at least one modulation parameter, and to receive radar signals, which are reflected from objects, and having an interference detector for detecting interferences in the received radar signals based on at least one frequency-dependent reception power threshold value corresponding to the particular modulation parameters, one of the modulation parameters being a modulation slope of the transmitted radar signal. An interference recognition method is also provided. | 01-24-2013 |
| 20130127656 | RADAR FILTER - A method of filtering radar return signals to discriminate between targets of interest and clutter is presented in which a filter filters radar return signals received by a first radar receiver, based on radar return signals received at another radar receiver, to produce filtered radar return data in which radar return signals received by the first radar receiver for targets of interest are present and radar return signals received by the first radar receiver but arising from clutter are suppressed. | 05-23-2013 |
| 20130169473 | METHOD FOR FILTERING OF CLUTTER BY SCAN-TO-SCAN CORRELATION USING DOPPLER INFORMATION - The present disclosure concerns a method for post-processing of radar data that uses information of Doppler speed as obtained by coherent processing of the input data, to reduce clutter due to waterbodies, in particular the sea clutter. The present disclosure further concerns a coherent radar provided with means suitable to implement the invention method. | 07-04-2013 |
| 20130181863 | Antenna Sidelobe Reduction Using Phase Only Control - A method for reducing sidelobe interference in a radar or communication system. The method includes selecting a desired amplitude weight (W | 07-18-2013 |
| 20130194130 | Enhanced target detection using dispersive vs non-dispersive scatterer signal processing - A method of target discrimination and identification, on a computer including a processing unit and a non-volatile storage device, from a radar signal having a plurality of radar return signals, is presented. The method includes: modeling, on the computer, the radar return signals by linear prediction to produce linear prediction equations; solving, on the computer, the linear prediction equations by the Burg algorithm to produce linear prediction coefficients for a linear prediction coefficient polynomial; computing, on the computer, roots of the linear prediction coefficient polynomial to produce scattering modes; computing, on the computer, a distance of each of the scattering modes to a unit circle; computing, on the computer, a complex envelope for each mode of the scattering modes; and selecting, on the computer, target scattering modes from among the scattering modes based on the distance of the mode to the unit circle and the complex envelope of the mode. | 08-01-2013 |
| 20130241766 | RADAR DEVICE - Under control of a first transmission code controlling section, a first radar transmitting section periodically transmits a first radar transmission signal with a first transmission period based on a first transmission trigger signal produced after elapse of a first delay time period from reception of a predetermined synchronization establishment signal by a first transmission trigger signal producing section. Under control of a second transmission code controlling section, a second radar transmitting section periodically transmits a second radar transmission signal with a second transmission period similarly. In accordance with the first delay time period and the second delay time period, arrival times of interference signals from the first radar transmitting section and the second radar transmitting section are within transmission zones of the second radar transmission signal and the first radar transmission signal. | 09-19-2013 |
| 20130257645 | TARGET VISIBILITY ENHANCEMENT SYSTEM - A method and apparatus ( | 10-03-2013 |
| 20130271312 | METHOD FOR DETERMINING AN ESTIMATE OF RADIAL SPEED OF RADAR ECHOES BY USING DOPPLER INFORMATION - The present disclosure concerns a method of post-processing of the radar data that uses information of Doppler speed obtained by coherent processing of the input data, in order to calculate the radial speeds of the detected objects, in particular close to waterbodies. The present disclosure further concerns a coherent radar provided with means suitable to implement the method of the present disclosure. | 10-17-2013 |
| 20140240169 | RADAR APPARATUS USING IMAGE CHANGE DETECTOR AND METHOD OF OPERATING THE SAME - Disclosed herein are a radar apparatus and a method of operating the same. The radar apparatus includes a clutter analysis unit, a screen change detection unit, a representative value acquisition unit, and a target detection unit. The clutter analysis unit analyzes the clutter value of a signal that is received by a reception unit. The screen change detection unit calculates the screen change time up to the time at which a screen has been changed from an image captured by an imaging apparatus. The representative value acquisition unit acquires a representative value based on a plurality of clutter values analyzed for the screen change time by the clutter analysis unit. The target detection unit determines the signal to be a target signal if the size of the signal is larger than both the clutter value and representative value of the signal. | 08-28-2014 |
| 20150109165 | Using Orthogonal Space Projections to Generate a Constant False Alarm Rate Control Parameter - An adaptive parameter for adjusting a threshold in a sensor system that provides a constant false alarm rate is disclosed. A projection space generator performs projection operations to create a matched projection space and first and second mismatched projection spaces such that each mismatched projection space is orthogonal or nearly orthogonal to the matched projection space. A mitigator engine receives the matched and first mismatched projection spaces and generates a covariance matrix from the first mismatched projection space and an image space from the covariance matrix and the matched projection space. A second mismatched projection space that is mismatched to both the matched and first mismatched projection spaces is provided to a clutter characterization engine that generates samples from the second mismatched projection space and the covariance matrix. The adaptive parameter is generated from the samples and is used as an input to a threshold adjuster in a target detector. | 04-23-2015 |
| 20150301158 | Waveform Selection for Mitigation of Radar Saturating Clutter - A computer-implemented method is provided for maximizing surveillance volume in a radar system. This includes determining saturation range probability | 10-22-2015 |
| 20150316642 | MITIGATION OF ANOMALOUS PROPAGATION EFFECTS IN RADAR - Disclosed is a method of mitigating the effects of anomalous propagation in a Radar system, comprising the steps of: receiving a plurality of returns from a plurality of transmit pulses; calculating a difference in magnitude between each of the plurality of returns and its successor; if one of the calculated differences indicates a first step change greater than a first predetermined threshold, calculating a first average magnitude of the returns received after the first step change, and replacing the returns received before the first step change with synthesised returns having a magnitude equal to the first calculated average magnitude. | 11-05-2015 |
| 20150338507 | RADAR SIGNAL PROCESSING METHOD AND APPARATUS - Provided is a radar signal processing method and apparatus, the method including transmitting a radar signal through a transmission antenna, receiving, through a reception antenna, a first reflection signal generated based on the radar signal reflected by an obstacle and a second reflection signal generated based on the radar signal reflected by a target located behind the obstacle, performing filtering by using a filter for removing the first reflection signal, and processing the second reflection signal extracted based on a result of the filtering. | 11-26-2015 |
| 20160018518 | DETECTION DEVICE, RADAR DEVICE, DETECTION METHOD, AND DETECTION PROGRAM - A detection device detects a target based on a reception signal obtained from a reflection signal of a transmission signal. The detection device includes a Doppler frequency component generator that acquires a Doppler frequency component that indicates the amplitude level of a reception signal, for at least one Doppler frequency, based on the reception signal, a region identifier that identifies a first region and a second region that is outside the first region, based on the value of the amplitude level and the increase rate in the amplitude level, a second-Doppler frequency component suppressor that suppresses the Doppler frequency component of an unnecessary signal, out of the Doppler frequency component corresponding to the second region, and a combiner that combines the Doppler frequency component corresponding to the first region outputted from the region identifier, and the output of the second Doppler frequency component suppressor. | 01-21-2016 |
| 20160061938 | Clutter Rejection Using Spatial Diversity In Wideband Radar For Enhanced Object Detection - Techniques are described that enable wideband radar systems with fast signal processing to detect certain types of targets in crowded and cluttered areas that challenge conventional radar architectures and signal processing methods. Multiple data sets are collected from at least one receiver within a radar system. Various weighting parameters are applied to the data sets to reduce the effect of clutter objects. Related systems, apparatus, methods, and articles are also described. | 03-03-2016 |
| 342160000 | MTI (Moving target indicator) | 17 |
| 20090046001 | Pulse doppler coherent method and system for SNR enhancement - A method and system for SNR enhancement in pulse-Doppler coherent target detection. In accordance with the method of the invention, complex signals are obtained for each of two or more sub-intervals of the time-on-target interval, allowing simultaneous rang and Doppler measurements. A coherent integration is then performed on the signals to generate complex-valued folded matrices. The folded matrices are unfolded and target detection is then performed in a process involving one or more of the unfolded matrices. A pulse-Doppler coherent system is also provided configured for target detection by the method of the invention. | 02-19-2009 |
| 20090091490 | METHOD AND SYSTEM FOR RADAR TRACKING OF MOVING TARGET FROM MOVING STATION - A method and system is proposed for use by a moving station (such as a jetfighter) for radar tracking of a moving target (such as an air-to-air missile). The proposed method and system involves the use of a hybrid FSK/LFM (Frequency Shift Keying & Linear Frequency Modulation) scheme for acquiring a collection of raw radar data, a first Gaussian-noise filter array of one-stage linear Kalman filters for S/N-enhancement of the raw radar data, a trilateration module, and a second Gaussian-noise filter array of one-stage linear Kalman filters for S/N-enhancement of the trilateration-resulted radar data. These features allow the radar tracking of moving objects to be more fast and accurate. | 04-09-2009 |
| 20100045509 | RADAR APPARATUS - The present invention provides a radar apparatus including: a transmission pulse group generator configured to generate: a first transmission pulse group from a first transmission pulse train formed of N first transmission pulses (N>2, where N is an integer number) having constant first time intervals t | 02-25-2010 |
| 20100079331 | METHOD FOR PROCESSING A RADAR ECHO SIGNAL - A method to process a radar echo signal is described. The method determines the value of at least one target motion parameter by selecting from a plurality of possible test values (VR | 04-01-2010 |
| 20100134346 | METHOD FOR THE MULTIDIMENSIONAL TEMPORAL KINEMATIC FILTERING OF RADAR BLIPS, FROM ANTENNA REVOLUTION TO ANTENNA REVOLUTION - The invention relates to the general field of the detection, notably the radar detection, of mobile or fixed targets. It consists of a method making it possible mainly to qualify the blips supplied by the processing subsystem of the detection system before the latter are analysed to generate tracks, each track being assumed to represent the trajectory of a moving object that has been detected. According to the invention, an analysis duration is considered, and all of the blips detected during this period are considered. These blips are divided up into subsets, each subset corresponding to the blips that, during the analysis duration, have been detected in one and the same analysis channel defined by an initial position and a speed vector. The subsets formed in this way are then grouped together, one and the same group combining the subsets comprising blips for which the combined assertion of a plurality of attributes is verified. | 06-03-2010 |
| 20100302090 | ADAPTIVE MICROWAVE SECURITY SENSOR - A method and apparatus are provided for operating a microwave detector for detecting intruders within a secured area. The method includes the steps of selecting a noise floor based upon a setting of a range setting potentiometer, detecting a magnitude of a signal reflected from a test subject within the secured area that exceeds the selected noise floor and establishing a threshold value for detecting an intruder based upon the magnitude of the detected signal and sensor mounting height. | 12-02-2010 |
| 20100321232 | Apparatus and Methods for Remote Detection of Physiological Changes - An apparatus for sensing motion having a transmitter for transmitting a carrier signal; a frequency control connected to the transmitter for controlling the frequency of the carrier signal; a first receiver for receiving the reflected transmitted carrier signal; a second receiver for receiving the reflected transmitted carrier signal, the second receiver being placed out of phase by less than a wavelength of the carrier signal from the first receiver; means for subtracting the carrier signal received by the second receiver from the carrier signal received by the first receiver to produce an error signal; wherein when motion is sensed by the apparatus, the error signal moves from zero thereby causing a corrective signal to be generated and sent to the frequency control, the frequency control forcing the error signal to zero. | 12-23-2010 |
| 20150301170 | A METHOD OF ESTIMATING A LOCAL PLOT DENSITY IN A RADAR SYSTEM; A PLOT DENSITY ESTIMATOR AND A RADAR SYSTEM WITH A PLOT DENSITY ESTIMATOR - A method of estimating a local plot density in a radar system observing an observation volume, the radar system configured to generate plots with plot attributes, by establishing a non-empty set of M-dimensional basis functions and corresponding coefficients, and repeatedly updating at least one coefficient based on at least one plot as obtained from the radar system, adjusting the basis functions and corresponding coefficients to represent a number of plots in a predetermined adjusting interval, and estimating the local plot density at a given point in the observation volume. | 10-22-2015 |
| 20160061944 | CLUTTER SUPPRESSING DEVICE AND RADAR APPARATUS PROVIDED WITH THE SAME - A clutter suppressing device for suppressing echo data of reflection waves caused by radar transmission signals reflecting on a static object is provided. Each of the radar transmission signals is transmitted at a predetermined azimuth from a radar antenna at a predetermined time interval. The clutter suppressing device includes an echo data memory configured to sequentially store a plurality of echo data of reflection waves caused by the radar transmission signals reflecting on objects, a filter configured to select, from the plurality of echo data, a data row in the azimuth direction for a predetermined distance, and suppress, in the data row, echo data of a target object moving at a speed within a predetermined range, and a suppression echo data output unit configured to output suppression echo data containing the echo data suppressed by the filter. | 03-03-2016 |
| 20160124084 | METHOD AND RADAR APPARATUS FOR DETECTING TARGET OBJECT - The present invention relates to a method for detecting a target object by a radar apparatus and an apparatus therefor, and more particularly, to an apparatus and a method for preventing deterioration of performance through a signal processing technology by recognizing a situation in which the detection performance of a radar is deteriorated, for example, in a steel tunnel. The radar apparatus includes: a signal transmission unit that transmits a transmission signal for detecting a target object; a signal reception unit that receives a reception signal generated when the transmission signal is reflected; a determination unit that determines a presence of a clutter structure using frequency response information of the reception signal; and a target detection unit that corrects a detection threshold value for detecting a target object according to the determination result on the presence of the clutter structure and detects a target object. | 05-05-2016 |
| 342161000 | With vehicle movement compensation (e.g., AMTI (Airborn MTI)) | 3 |
| 20110309972 | Adaptive sidelobe blanking for motion compensation - A motion compensation method and system is included in a radar antenna system mounted on a moving platform which is subject to pitch, yaw and roll. The radar antenna system includes a main array antenna, and an auxiliary antenna. The auxiliary channel associated with the auxiliary antenna utilizes roll, pitch and yaw angle motion compensations as its auxiliary antenna always steers a horizontal fan shape beam at the horizon to blank any surface (land or sea) based EM interferences. Such motion compensations are provided by a ship motion compensator component and process included within the antenna system. The ship motion compensator component in response to platform motion signals indicative of changes in platform motion angles generates new sets of values using an initial set of weighting coefficient values as a function of such angle motion changes. This produces changes in both amplitude and phase weighting coefficient values which results in both the quadrant phase rotation and the element weighting rotation. The process steers and spreads out the received auxiliary antenna pattern making sidelobe coverage broad enough to compensate for such changes in platform motion. | 12-22-2011 |
| 20140009324 | AUTOFOCUS-BASED COMPENSATION (ABC) SYSTEM AND METHOD FOR A HOVERING GROUND MOVING TARGET INDICATION (GMTI) SENSOR - Embodiments of the present invention generally relate to motion compensation, and in particular to an autofocus-based compensation (ABC) systems and methods for a ground moving target indication platform. According to one embodiment, a method for autofocus based compensation of range data acquired from an object in motion is provided. The method may include: receiving range data; steering at least one receive beam of the range data in a desired direction; transforming the range data into the range domain; determining the width of a main clutter lobe; excluding data that is not part of the main lobe clutter response; transforming the main-lobe clutter response into the range domain; calculating a phase correction term; and applying the phase correction to the original range data. | 01-09-2014 |
| 20160061946 | METHODS AND APPARATUS FOR ADAPTIVE MOTION COMPENSATION TO REMOVE TRANSLATIONAL MOVEMENT BETWEEN A SENSOR AND A TARGET - Methods and apparatus for performing adaptive motion compensation to remove translational movement between a sensor and a target using data from the sensor. After whitening, data can be processed to select a target and focus frequency components. Dynamic sliding window processing can be performed on processed time domain data to estimate an instantaneous range rate for the target. | 03-03-2016 |
| 342162000 | Digital | 3 |
| 20090174595 | SAR ATR treeline extended operating condition - A synthetic aperture radar acquires an image of one or more objects and identifies them as targets. The objects are located in the proximity of clutter within the image such of trees, or a tree line. The radar acquires a SAR image having pixels descriptive of the clutter and the object(s). Regions having object pixels are identified within the synthetic aperture image using an object identification (algorithm), where the object identification (algorithm) utilizes one or more historically known target characteristics and one or more measured characteristic to obtain an output. Boundaries are identified for the one or more objects within the output using an object isolation, such as, for example, a Watershed transform. Clutter pixels are identified external to the one or more objects. The clutter pixels are suppressed from the synthetic aperture image thereby generating a clutter reduced image containing the one or more objects. The objects are compared with known images of a probable target until a match is found, the match representing the target identification. | 07-09-2009 |
| 20100245157 | Generalized inner product method and apparatus for improved detection and discrimination - Method and apparatus for improving the detection and discrimination of slow moving or stationary range-Doppler spread objects on or in close proximity to the ground (or sea surface). Invention detects, discriminates and separates radar returns from interference including ground clutter discretes via a coherent process for separating target returns from the myriad of received signals. Thus the method and apparatus improves the probability of detecting and declaring the presence or absence of an object at the same time that the probability of false declaration decreases. The method and apparatus may be applied to the processing of any over resolved object, including airborne radar. | 09-30-2010 |
| 20100302091 | WIDEBAND INTERFERENCE CANCELLATION USING DSP ALGORITHMS - A method and system is provided for detecting and characterizing pulsed threat radar emitters through heavy in-band interference. System includes an advanced digital signal processing method provides spatial and temporal interference cancellation, super-resolution direction-finding, and high resolution spectrum analysis techniques. The system receives the digitized output of a discriminator bank and produces highly accurate threat pulse radio frequency estimates. The invention further provides a two-channel configuration for a DF subsystem, to perform adjacent-beam direction-finding through severe interference environments. The invention provides increased sensitivity, increased frequency accuracy, and up to 40 dB of increased interference look-through capability in ES system but remains transparent to ES system functioning and to ES system operators. | 12-02-2010 |
| 342164000 | With storage tube | 1 |
| 20110063162 | IMAGE PROCESSING DEVICE, RADAR APPARATUS EQUIPPED WITH THE SAME, METHOD OF PROCESSING IMAGE, AND IMAGE PROCESSING PROGRAM - This disclosure provides an image processing device, which includes an actual trail image memory for storing an actual trail data group indicating absolute changes in position of a target object detected by echo signals obtained corresponding to detection signals transmitted while changing an azimuth direction of the transmission, and a moving target object determination processing module for determining whether the target object detected with the detection signals is a moving target object based on the actual trail data group. | 03-17-2011 |
