A boc(n,n) shift correlation unambiguous acquisition method and device
A technology without ambiguity and correlation function, applied in the field of satellite navigation and positioning, it can solve the problem of inability to deal with ambiguity, and achieve the effect of saving calculation amount, eliminating multimodality, and improving capture accuracy
Active Publication Date: 2021-02-19
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology
The BOC signal direct processing method is to correlate the received signal with the locally generated BOC signal. Although the algorithm is simple to implement, it cannot deal with the ambiguity problem caused by the multimodality of the autocorrelation function.
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[0056] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.
[0057] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the compo...
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The present invention proposes a BOC (n, n) shift-related unambiguous acquisition method, including: performing down-conversion processing on the BOC signal to obtain an intermediate frequency signal; mixing the intermediate frequency signal with a local carrier to obtain the in-phase branch signal and the quadrature branch signal Road signal; divide the local PRN sequence into odd branch signal and even branch signal; multiply the odd branch signal and the complex signal to obtain the first signal; advance the first signal by a quarter of a chip respectively and lag three quarters of chips to obtain the second signal and the third signal respectively; carry out coherent integration operation on the second signal and the third signal to obtain the fourth signal and the fifth signal; according to the reconstruction correlation rule, The sixth signal and the seventh signal are obtained, and according to the detection statistic formula, an unambiguous detection statistic is obtained; it is judged whether the detection statistic is greater than the set detection threshold value, if so, it means that the signal is accurately captured.
Description
technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and in particular relates to a BOC (n, n) shift-related unambiguous acquisition method. Background technique [0002] At present, satellite navigation has entered the GNSS multi-system era from the single GPS era. With the continuous increase of signals, the spectrum resources are limited, and the spectrum overlap of satellite signals causes signal interference within and between systems, thereby affecting the performance of satellite navigation and positioning. The BOC modulation technology has the characteristic of spectrum splitting and can realize spectrum sharing. However, the autocorrelation function of the BOC modulated signal has multiple correlation peaks. The multiple peaks of the signal cause the energy dissipation of the correlation peaks, which easily causes the peak value of the secondary peak to exceed the peak value of the main peak, thus causing false...
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IPC IPC(8): G01S19/24G01S19/29G01S19/30
CPCG01S19/24G01S19/29G01S19/30
Inventor 孙希延周青纪元法严素清付文涛符强王守华黄建华
Owner GUILIN UNIV OF ELECTRONIC TECH