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公开(公告)号：US10649095B2
公开(公告)日：2020-05-12
申请号：US15586254
申请日：2017-05-03
Inventor： Jiaolong Wei , Zuping Tang , Jianfeng Shi
Abstract: A method for joint data-pilot tracking of navigation signal, including: multiplying a digital intermediate frequency signal with a local carrier to accomplish carrier removal; multiplying a signal after the carrier removal with a data baseband signal and a pilot baseband signal respectively to accomplish code removal; processing a signal after the code removal with integration-and-dump to obtain a coherent integration result of each branch; using the coherent integration results to accomplish data-bit flip detection and calculation of probability-weighting factor; acquiring a data-pilot joint carrier tuning-amount, and tuning the carrier numerically controlled oscillator by the carrier tuning-amount to realize data-pilot joint signal carrier tracking; and acquiring a data-pilot joint code tuning-amount, and tuning the code numerically controlled oscillator to realize baseband signal tracking.
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公开(公告)号：US10298338B2
公开(公告)日：2019-05-21
申请号：US15532501
申请日：2014-10-16
Inventor： Zuping Tang , Jiaolong Wei , Xiaoqing Zhang , Changjian Liu
Abstract: A method for evaluating the quality of a radio frequency signal for a satellite navigation system, the method comprising: sampling the payload radio frequency signal of a satellite to obtain an intermediate frequency signal, and filtering the signal; downconverting the filtered intermediate signal to obtain the corresponding actual baseband signal; generating the signal components of the ideal baseband signal branches on the basis of the obtained actual baseband signal and the signal system thereof; reproducing the ideal baseband signal, which is used to evaluating the actual baseband signal; establishing a correlation function between the actual baseband signal to be evaluated and the ideal baseband signal, and obtaining through corresponding calculations a series of quality evaluation indexes such as spurious transmission in the band and related loss, thereby enabling the evaluation of the quality of the radio frequency signal. The present invention clarifies the relation between signal quality indexes and the capturing, tracking, and demodulation performance of a signal, and can clearly and regularly evaluate the effect of the signal quality on navigation performance.
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公开(公告)号：US10763896B2
公开(公告)日：2020-09-01
申请号：US16263947
申请日：2019-01-31
Inventor： Li Peng , Gaofeng Li , Jiaolong Wei , Kun Liang , Bo Zhou
IPC: H03M13/15 , H03M13/03 , H03M13/00 , H04L12/935 , H04B3/54
Abstract: A construction method for a (n,n(n−1),n−1) permutation group code based on coset partition is provided. The presented (n,n(n−1),n−1) permutation group code has an error-correcting capability of d−1 and features a strong anti-interference capability for channel interferences comprising multi-frequency interferences and signal fading. As n is a prime, for a permutation code family with a minimum distance of n−1 and a code set size of n(n−1), the invention provides a method of calculating n−1 orbit leader permutation codewords by On={αo1}α=1n-1(mod n) and enumerating residual codewords of the code set by Pn=CnOn={(l1)n-1On}={(rn)n-1On}. Besides, a generator of the code set thereof is provided. The (n,n(n−1),n−1) permutation group code of the invention is an algebraic-structured code, n−1 codewords of the orbit leader array can be obtained simply by adder and (mod n) calculator rather than multiplication of positive integers. Composition operations of the cyclic subgroup Cn acting on all permutations oα of the orbit leader permutation array On are replaced by well-defined cyclic shift composite operation functions (l1)n-1 and (rn)n-1 so that the action of the cyclic group acting on permutations is realized by a group of cyclic shift registers.
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公开(公告)号：US10230397B2
公开(公告)日：2019-03-12
申请号：US15060111
申请日：2016-03-03
Inventor： Li Peng , Gaofeng Li , Jiaolong Wei , Kun Liang , Bo Zhou
IPC: H03M13/15 , H03M13/00 , H04L12/935 , H04B3/54
Abstract: A construction method for a (n,n(n−1),n−1) permutation group code based on coset partition is provided. The presented (n,n(n−1),n−1) permutation group code has an error-correcting capability of d−1 and features a strong anti-interference capability for channel interferences comprising multi-frequency interferences and signal fading. As n is a prime, for a permutation code family with a minimum distance of n−1 and a code set size of n(n−1), the invention provides a method of calculating n−1 orbit leader permutation codewords by On={αo1}α=1n−1(mod n) and enumerating residual codewords of the code set by Pn=CnOn={(l1)n−1On}={(rn)n−1On)}. Besides, a generator of the code set thereof is provided. The (n,n(n−1),n−1) permutation group code of the invention is an algebraic-structured code, n−1 codewords of the orbit leader array can be obtained simply by adder and (mod n) calculator rather than multiplication of positive integers. Composition operations of the cyclic subgroup Cn acting on all permutations oα of the orbit leader permutation array On are replaced by well-defined cyclic shift composite operation functions (l1)n−1 and (rn)n−1 so that the action of the cyclic group acting on permutations is realized by a group of cyclic shift registers.
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