Class / Patent application number | Description | Number of patent applications / Date published |
342465000 | Plural receivers only | 16 |
20080204322 | Determining Positional Information - Apparatus for determining positional information relating to an object, comprising: means for receiving, comprising a plurality of receiving elements; detection means for detecting signals received at the receiving elements and for generating output signals representative of the received signals; and processing means operable to apply, for each receiving element, a process to the output signal generated from the signal received at that receiving element separately from any output signal generated from a signal received at any other receiving element, so as to obtain a respective value of a parameter representative of the signal received at that receiving element, the processing means being further operable to compare the values of the parameter thus obtained so as to, obtain positional information relating to the object. | 08-28-2008 |
20090219211 | Method and apparatus for locating the source of radio frequency emissions - At least two receiver sets are provided. A data processor is in communication with the receiver sets, wherein the data processor tags position data and radio frequency emission data from the receiver sets. A data storage unit is in communication with the data processor and is at least capable of storing tagged data. A processing unit is capable of processing the tagged data. The processing unit defines a search grid within which to search for the source of the radio frequency emission. The processing unit motion compensates the tagged data separately for each point on the grid. The processing unit assigns a value to each grid point based on a phase coherence of the motion compensated data. The processing unit determines a location within the grid having a highest assigned value, thereby determining the source of the radio frequency emission. | 09-03-2009 |
20090243934 | Wireless time reference system and method - Instead of normalizing time reference of independent spatially-located clocks using a reference tag transmission from known location, the present invention uses an interarrival time interval between a pulse pair of UWB pulses as a timing metric. Thus, a method of synchronizing spatially-located clocks or normalizing time indications thereof comprises transmitting a UWB pulse pair, determining at first and second monitoring stations a respective count value indicative of a locally measured time interval between received pulse pairs, determining a ratio between clock counts of first and second monitoring stations, and utilizing the ratio to determine clock skew, e.g., a timing correction to be applied to respective local clocks of the monitoring stations. A corresponding system comprises a reference tag transmitter that transmits a pulse pair of UWB pulses to define a time reference interval, a first independent receiver that receives, the pulse pair to generate a first count value indicative an interarrival interval between the pulse pair, a second independent receiver that receives the pulse pair to similarly generate a second count value, and a processor hub responsive to the count values to determine a ratio corresponding to the ratio of respective clock frequencies of the first and second receiver clocks. Once the correction is applied, time-of-arrival information from object tag transmissions may be used to determine object location with sub-foot position accuracies. | 10-01-2009 |
20120293373 | RTLS SYSTEM USING TDO - Provided is an RTLS system using TDOA, the RTLS system tracking, by a positioning unit, a position of a transmitter based on a position signal transmitted by the transmitter, the system comprising a plurality of receivers receiving the position signal from the transmitter, and a gateway calculating a time difference of position signal arriving at the plurality of receivers from the transmitter and providing the time difference to the positioning unit. | 11-22-2012 |
20130207845 | METHOD AND APPARATUS FOR DETERMINING THE POSITION AND ORIENTATION OF A MOBILE TRANSMITTER - A method and an apparatus for determining the position and orientation of a mobile transmitter that has at least two linearly polarized antennas arranged at a predefined angle to one another. A plurality of receivers, which can be synchronized with the mobile transmitter and of which the position is known, each receive transmitter signals of predefined carrier frequency via a circularly polarized antenna. A field-theoretical model of the transmission path between the mobile transmitter and receivers is set up and defines the carrier phase measured values, the field-theoretical model is implemented in a Kalman filter, and the receiver signals are evaluated in terms of carrier phase measured values and/or time of arrival values. The position and orientation of the mobile transmitter are determined in the Kalman filter with use of the field-theoretical model and the carrier phase measured values and/or time of arrival values established from the receiver signals. | 08-15-2013 |
20130293423 | METHOD AND SYSTEM FOR DETERMINING THE LOCATION OF AN ELECTRONIC DEVICE USING MULTI-TONE FREQUENY SIGNALS - Embodiments of the present invention include a method of determining a location of a mobile device. The method comprises transmitting a signal between a plurality of known locations and receiving signal at device of unknown location such as a mobile device. The signal may include multiple tones having different frequencies and resulting in sets of residual phase differences. The location of the mobile device may be determined using the known locations and the frequency and phase differences between the transmitted tones. In one embodiment, OFDM signals may be used between an access point and mobile device, for example, to determine the location of the mobile device. | 11-07-2013 |
20140022128 | GEOLOCATION - In selected embodiments, a process of geolocation of a transmitter uses a receiver with an antenna array that is non-line-of-sight (NLoS) to the transmitter. A first plurality of scatterers within line-of-sight (LoS) of the array is located using multilateration based on time difference of arrival (TDoA) from the first scatterers, and applying a spatial consistency requirement. Time of emission/reflection from the first scatterers is also determined. The coordinates and timing of the first scatterers are used to locate either the transmitter or another set of scatterers, by applying multilateration to the TDoA at the first scatterers, and applying the spatial consistency requirement. The process is iteratively repeated until the transmitter is identified. The multilateration may be linearized without sacrificing precision. In each iteration, a non-singularity requirement is applied to ensure that the selected scatterers produce unambiguous results. | 01-23-2014 |
20140247187 | ESTIMATION OF TIME DIFFERENCE OF ARRIVAL (TDOA) IN MULTIPATH ENVIRONMENTS BASED ON SUB-NYQUIST RATE SAMPLING - A method is provided for to determining a time difference of arrival (TDOA) between a first signal and a second signal. The method includes sampling a first signal at a sub-Nyquist rate to provide a first sampled signal; sampling a second signal at the sub-Nyquist rate to provide a second sampled signal, the first and second signals representing corresponding multipath channels; cross-correlating the first and second sampled signals; and determining an estimate of the TDOA between the first and second signals based on the sampled first and second signals. | 09-04-2014 |
20140354481 | 406 MHZ RECEIVER MEASURING TOA AND FOA FOR USE IN DETERMINING THE POSITION OF AN EMERGENCY BEACON - A method for locating a Cospas-Sarsat emergency beacon comprises transmitting a Cospas-Sarsat compliant transmission from an emergency beacon and receiving the transmission at a plurality of receivers wherein the plurality of receivers comprises at least one terrestrial receiver operable to receive the transmission directly from the emergency beacon. The method further comprises measuring, utilizing a processing circuit, at the at least one terrestrial receiver a frequency of arrival and time of arrival of the transmission and transmitting the frequency of arrival and the time of arrival of the transmission to a central processing terminal operable to determine the location of the emergency beacon. | 12-04-2014 |
20150097732 | SYSTEM FOR TRACKING AN OBJECT USING PULSED FREQUENCY HOPPING - Tracking systems and methods for obtaining position coordinates of transmitters are provided. One or more transmitters send multiple carrier signals to multiple receivers, where the time difference of arrival of the multiple carrier signals are used to determine the location of each transmitter. Accuracy is obtained by using phase information of multiple carrier frequencies for time difference of arrival measurements. The accuracy obtained by a receiver depends on the quality of the received carrier signal; a received carrier signal may become distorted by the presence of multipath interference. By using multiple signals with different frequencies, the system can screen or compensate for multipath effects. This screening can be accomplished either through various signal-sampling techniques or by averaging the signals received at the receiver. Because signals with different frequencies have different multipath experiences, a computer can analyze and compensate for “good” and “bad” signals. | 04-09-2015 |
20150145728 | HIGH FREQUENCY TRANSMITTER AND RECEIVER TRACKING SYSTEM - A tracking system for remotely tracking the movement and location of an object in a three-dimensional space. The tracking system including a transmitter for transmitting a signal, a plurality of receivers for receiving the signal, and a computing device for determining a location of the object based on known positions of the receivers and a time difference between the time that the signal is transmitted and the time that the receivers receive the signal. | 05-28-2015 |
20150346313 | WIRELESS ACCESS POINT LOCATION ESTIMATION USING COLLOCATED HARVEST DATA - Collocated access point (AP) harvest data is combined with accurate location-tagged harvest data to improve access point location estimates and to estimate the location of access points that could not be previously estimated. | 12-03-2015 |
20160041254 | METHOD FOR THE PASSIVE LOCALIZATION OF RADAR TRANSMITTERS - A method of passive location of radar transmitters implemented by at least two ESM stations, the radars having a quasi-constant scanning speed in the course of the transit over the set comprising at least two ESM stations, each of the ESM stations being able to intercept the transmission lobes of radar transmitters and to estimate their lobe transit times (LTT) and at least one station being able to estimate the angle of arrival α of the transmission lobes, the location of the radar transmitters being performed by testing the intersection between an iso-LTTD curve passing through at least the two ESM stations and a sighting straight line passing through the ESM station having measured the angle of arrival and of azimuth equal to the measured angle of arrival α. | 02-11-2016 |
20160097837 | Method for Iterative Target Location in a Multiple Receiver Target Location System - The present invention provides methods for an active RFID tag target location system that provides for an iterative recalculating of a target location estimate by successively testing receiver TOA and DTOA error measurements and discarding outlier receivers. The present invention works to reduce the erratic effects that multipath channel interference and random noise play in target location systems due to incorrect identification of the main pulse of the transmit signal. In addition to providing for a greater accuracy and consistency in a TOA-based target location system, the method also provides for an opportunity to reduce a transmission bandwidth associate with the TOA transmission by the multiple receivers. The method may be considered a post-processing element, as the determination of TOA and DTOA may require a real-time calculation, where the timing constraints for the ensuing target location estimate may be less severe. | 04-07-2016 |
20160139240 | MOVING OBJECT DETECTION SYSTEM WITH DIRECTION AND DISTANCE PREDICTION - In one representative embodiment, a method of detecting position relative to a wind turbine can comprise detecting a condor within a detection area, determining a first position of the condor relative to the wind turbine, assigning the condor to a first predetermined zone of a plurality of predetermined zones based on the first position, determining a second position of the condor relative to the wind turbine, assigning the condor to a second predetermined zone of the plurality of predetermined zones based on the second position, predicting a trajectory of the condor based on a relationship between the first position and the second position. | 05-19-2016 |
20170234962 | METHOD AND APPARATUS FOR LOCATING OF A MOBILE DEVICE | 08-17-2017 |