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公开(公告)号：US20210373179A1
公开(公告)日：2021-12-02
申请号：US17334477
申请日：2021-05-28
申请人： oneNav, Inc.
摘要： Global navigation satellite systems and methods use L5 GNSS signals to acquire secondary code phases of those signals without using L1 GNSS signals to aid in the acquisition of secondary code phases. Various embodiments are described to perform this acquisition.
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公开(公告)号：US11086021B1
公开(公告)日：2021-08-10
申请号：US16910230
申请日：2020-06-24
申请人： Regulus Cyber Ltd.
发明人： Avner Zangvil , Gal Cohen , Stanislav Gutliansky , David Ramati , Yoav Zangvil
摘要： A duplicate peak detector acquires and tracks a first correlation peak for a data sequence associated with a navigation satellite in a satellite navigation signal. During tracking of the first correlation peak, a second correlation peak is acquired and tracked for the same data sequence. Respective values of at least one tracking variable of the two correlation peaks are analyzed, and based on the analysis it is determined whether the first and second correlation peaks are associated with the same navigation signal or different navigation signals. If the first correlation peak and the second correlation peak are associated with the same navigation signal, tracking of one of the correlation peaks is discontinued.
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公开(公告)号：US20210226346A1
公开(公告)日：2021-07-22
申请号：US16745277
申请日：2020-01-16
申请人： u-blox AG
发明人： Thomas KAUFMANN , Roderick BRYANT
摘要： An apparatus includes an antenna assembly including an antenna configured to receive a signal and generate, at a plurality of feed points of the antenna, a plurality of corresponding polarized signals having respective polarization directions different from each other, using the received signal; and a switching circuit configured to periodically switch between the plurality of feed points to select a corresponding one of the polarized signals among the plurality of polarized signals at a point of time based on a switching signal.
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24.发明申请公开(公告)号：US20210132237A1
公开(公告)日：2021-05-06
申请号：US17058219
申请日：2018-05-24
摘要： A receiver is provided for use with a global navigation satellite system (GNSS) comprising multiple satellites. The receiver comprises a receiver clock and at least one antenna for receiving multiple signals over multiple respective channels, each channel being defined by a transmitting satellite and a receiving antenna at opposing ends of the channel. The receiver further comprises at least one correlator for calculating cross-correlation functions between (i) the signals received over the multiple channels and (ii) reference versions of the navigation signals provided by the receiver. The receiver is configured to use the calculated cross-correlation functions to perform a joint estimate of (i) a clock bias of the receiver clock relative to the time reference maintained by the GNSS, and (ii) a composite channel comprising the combined contribution of the multiple channels as a function of time-delay.
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公开(公告)号：US20210026021A1
公开(公告)日：2021-01-28
申请号：US15999093
申请日：2017-02-10
申请人： SEPTENTRIO N.V.
发明人： Daniel SALLAERTS , Koen PAUWELS , Wim DE WILDE
摘要： A receiver for satellite navigation includes a signal processor for deriving from a satellite signal a pseudorandom sequence of code chips, a converter for producing a digitized version of the received PRN sequence, a first and second shift register (3, 7), a code generator (4), a set of correlators, circuitry for summing correlation values and circuitry for determining a maximum of the summed correlation, and a scheduler (20). The receiver includes at least one multiplexer (6, 24), configured to transform multiple PRN sequences into an interleaved sequence and to enter the interleaved sequence into the first or second shift register (3, 7). The summing circuitry has multiple summing circuits (11) for separately summing correlation values related to the multiple PRN sequences. The circuitry for determining a maximum is configured to determine the maximum in one or more subgroups of sums determined by the multiple summing circuits (11).
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公开(公告)号：US10830903B2
公开(公告)日：2020-11-10
申请号：US15974711
申请日：2018-05-09
发明人： Gowdayyanadoddi Shivaiah Naveen , Smruthi Marapacheru , Chandrakala Ravindra , Srinivas Bhaskar
摘要： A global navigation satellite system (GNSS) signal tracking system (GNSSSTS), deployed in a tracking channel of a GNSS baseband engine, includes a piecewise down sampling module for generating code bit accumulated values (CBAVs) at different time instants at a reduced rate from samples of intermediate frequency data received at a high rate, and a pseudo random noise (PRN) code generation module for generating a PRN code bit sequence (PRNCBS) corresponding to a GNSS signal and storing arms of the PRNCBS. The GNSSSTS includes a primary mixer for generating a despread value for a selected arm of the PRNCBS and a phase component generation module (PCGM) for generating inphase and quadrature phase correlation components of the despread value for storage in a storage array. The primary mixer, the PCGM, and the storage array perform their functions continuously for each CBAV generated at a corresponding time instant in a time multiplexed manner.
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公开(公告)号：US10816673B2
公开(公告)日：2020-10-27
申请号：US14919710
申请日：2015-10-21
IPC分类号： G01S19/30 , H04B1/7075
摘要： A personal navigation device includes a correlator for processing GNSS signals from a constellation of satellites A signal is received from a navigation beacon containing a repeating code word, in which the code word includes a number N of samples corresponding to N phases, and in which reception of each code word occurs within a defined time period T. The sequence of N code samples is correlated with a known code word to determine a maximum value of correlation for a particular phase of the received signal. The correlation is performed using a correlator of size M, in which M is less than N, such that N/M=P complete correlations for a partial code phase are performed such that each correlation of a partial code phase is performed within a time period of approximately T/P. All P correlations of partial code phases are completed within time T.
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公开(公告)号：US20200225360A1
公开(公告)日：2020-07-16
申请号：US16648314
申请日：2018-09-19
申请人： SAAB AB
发明人： Patrik DAMMERT , Hans HELLSTEN
摘要： The present invention relates to a method for determining a synthetic aperture of a synthetic aperture radar, SAR, system using information from a global navigation satellite system, GNSS, which includes a plurality of satellites each transmitting a radio frequency signal comprising a unique pseudo random number, PRN. The method comprises: receiving the radio frequency signal from a group of satellites in the GNSS, determining a first maximum correlation peak of the PRN of the received radio frequency signal from each satellite in the group of satellites, determining the phase shift between the first determined maximum correlation peak and a second determined maximum correlation peak of a received PRN from the same satellite at a later time, for each satellite in the group of satellites, determining a line-of-sight, LOS, movement of the SAR system relative each of the satellites in the group of satellites by means of the determined phase shift for each satellite in the group of satellites, and determining a synthetic aperture using the LOS movement relative each satellite in the group of satellites.
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公开(公告)号：US20200158880A1
公开(公告)日：2020-05-21
申请号：US16689544
申请日：2019-11-20
摘要： A GNSS receiver comprises a memory interface, one more front end processors, a correlator and a computation unit. The one more front end processors are configured to store, using the memory interface, in a first portion of a shared memory, a set of captured data samples of a received GNSS signal. The correlator is configured to retrieve, using the memory interface, at least a portion of the data samples from the first portion, generate a plurality of correlation results, each correlation result indicating a degree of correlation between the retrieved data samples and a ranging code of a plurality of ranging codes, and store, using the memory interface, the plurality of correlation results in a second portion of the shared memory. The computation unit is configured to retrieve, using the memory interface, at least one of the correlation results from the second portion of the shared memory, process the retrieved correlation results to generate one or more processed results, and store the one or more processed results in a third portion of the shared memory.
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公开(公告)号：US20190331801A1
公开(公告)日：2019-10-31
申请号：US16319356
申请日：2017-01-19
发明人： Zuping TANG , Jiaolong WEI , Xuan XIAO , Tian LI
摘要： The invention discloses a method for receiving TD-AltBOC signal, which belongs to the field of global satellite navigation. The method of the invention includes steps of: converting a TD-AltBOC radio-frequency signal into an medium frequency, performing a band-pass filtering and sampling on the signal, and peeling off a sampled signal carrier by using a local carrier to obtain a sampled baseband signal; correlating on a local waveform with the sampled baseband signal chip-by-chip in a time division manner; performing a data demodulation according to correlated output signals, and obtaining a carrier phase deviation estimated value and a code phase deviation estimated value according to the correlated output signals; generating the local waveform according to the code phase deviation estimated value; generating the local carrier according to the carrier phase deviation estimated value. The invention also provides an apparatus for receiving TD-AltBOC signal.
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