Patent application number | Description | Published |
20110187594 | Method for Self-Calibration of Frequency Offsets - A method for self-calibration of frequency offsets in a measurement equipment of an interference monitoring system is provided. The method involves sampling I/Q data using the interference monitoring system measurement equipment and acquiring satellite navigation signals from the I/Q data. A carrier frequency of the satellite navigation signal is estimated and an expected carrier frequency of the satellite navigation signal is calculated. The expected carrier frequency of the satellite navigation signal is compared with the estimated carrier frequency of the satellite navigation signal and a frequency offset value is calculated as the difference between the expected and estimated carrier frequencies of the satellite navigation signal. The frequency offset value is stored in a memory and used to compensate the frequency offset of at least one subsequent measurement. | 08-04-2011 |
20120026035 | Method for Resolving Sub-Carrier Ambiguities of a Number of Tracking Channels of a Navigation Signal - A method for resolving sub-carrier ambiguities of a total number of tracking channels of a binary offset carrier (BOC) navigation signal is provided. For a simultaneously considered subset of at least four tracking channels, a set of sub-carrier candidate ambiguities is determined based on the sub-carrier modulation. Position and receiver clock error are calculated for each possible combination of sub-carrier ambiguities. Predicted delays are calculated based on each calculated position and receiver clock error. Differences between the predicted delays and the delay candidates originating from each specific combination of subcarrier ambiguities are calculated. A residual is calculated based on the differences and the set of sub-carrier ambiguities and the corresponding position and receiver clock error leading to the smallest residual are selected. | 02-02-2012 |
20120319897 | METHOD AND SYSTEM FOR DETERMINING THE POSITION OF A GNSS RECEIVER ARRANGED IN A MOTOR VEHICLE - Method and system for determining, via sensor network, position of GNSS receiver arranged in a motor vehicle intentionally is impaired in a targeted manner by interference source. Sensor network includes traffic route points having at least one sensor to detect a presence of interference source. Method includes detecting, as motor vehicle passes one of traffic route points, an interference signal emitted by interference source and/or a received signal of GNSS receiver impaired by interference source by the at least one sensor of the one traffic route point; processing the detected signals to establish whether interference source is present in passing motor vehicle; and when the presence of interference source established, generating information that signals at least a location of the one traffic route point and the interference source in the motor vehicle. A position of the motor vehicle is determined from the location of the traffic route point. | 12-20-2012 |
20120323438 | Device for Detecting and Tracking Motor Vehicles - A device for detecting and tracking vehicles includes a position-determining device for determining a current vehicle position, a transmitting device for transmitting the current vehicle position to a receiver via a communication channel, and a device for detecting an activated interfering transmitter and for triggering an action depending on the detection of an activated interfering transmitter. | 12-20-2012 |
20140247184 | Platform Relative Navigation Using Range Measurements - A method for platform relative navigation using range measurements involves four or more transmitters of positioning signals located on and/or near a platform of a first object and a second object approaching the platform that includes three or more receivers for receiving the positioning signals. For each received positioning signal, a range measurement between the transmitter of the positioning signal and the receiver of the positioning signal is performed. The relative position and relative attitude of a body frame of the second object is estimated with regard to the first object by processing the range measurements with a state space estimation algorithm implementing a model of the system of the first and second object. | 09-04-2014 |
20140368383 | Method for Carrier-to-Noise Ratio Estimation in GNSS Receivers - A method for determining an indicator of an amount of noise comprised within a received signal within a satellite communication network or a GNSS involves extracting a received modulating signal from the received signal. An estimate of the transmission delay is determined based on the in-phase component of the modulating signal. A prompt replica of the modulating signal is generated using the estimate of the transmission delay. A prompt quadrature correlation of the quadrature component of the received modulating signal and of the quadrature component of the prompt replica is determined, and the indicator of the amount of noise comprised within the received signal is determined based on the prompt quadrature correlation. | 12-18-2014 |
20150236751 | Receiver for Acquiring and Tracking Spread Spectrum Navigation Signals with Changing Subcarriers - A receiver acquires and tracks a spread spectrum navigation signal with changing subcarriers. The carrier signal changes between several subcarriers according to a hopping frequency and is modulated with data and a pseudorandom noise code signal. The receiver includes a carrier wipe off unit for down converting a received spread spectrum navigation signal from its carrier frequency to a baseband frequency, a frequency hopping wipe off unit for wiping off the hopping frequency from the received spread spectrum navigation signal, and a replica signal generation unit for generating at least one replica signal of the pseudorandom noise code signal for acquiring and tracking the received spread spectrum navigation signal after carrier wipe off. The generation of the at least one replica signal is performed depending on a sojourn time of the spread spectrum navigation signal at a subcarrier and a selected predetection integration time, and a correlation and integration unit correlates and integrates the received spread spectrum navigation signal after carrier wipe off with the at least one replica signal for the selected predetection integration time. | 08-20-2015 |
20160072546 | Spread Spectrum GMSK Signals - A method for generating a spread spectrum Gaussian Minimum Shift Keying (GMSK) signal includes obtaining a sequence of data symbols for a data channel, obtaining at least one first spread spectrum code comprising a first sequence of spread spectrum chips for the data channel, obtaining at least one second spread spectrum code comprising a second sequence of spread spectrum chips for a pilot channel, and generating a sequence of pre-modulation chips by combining the sequence of data symbols for the data channel with the spread spectrum chips of the first sequence of the at least one first spread spectrum code and data symbols for the pilot channel with the spread spectrum chips of the second sequence of the at least one second spread spectrum code to a combined sequence of chips. The method further includes assigning the chips of the combined sequence of chips to the transmission channels In-Phase I and Quadrature Q of the spread spectrum GMSK signal so that not more than two consecutive pre-modulation chips generated with the same spread spectrum code are transmitted in the same transmission channel I or Q, and performing GMSK modulation using the sequence of pre-modulation chips to generate a spread spectrum GMSK signal. | 03-10-2016 |