Ambiguity-free acquisition method and device based on correlation shift boc(n,n)
A capture device and non-ambiguous technology, applied in the field of satellite navigation and positioning, can solve problems such as signal capture ambiguity, achieve the effects of saving computation, improving capture sensitivity, and wide applicability
Active Publication Date: 2020-08-04
GUILIN UNIV OF ELECTRONIC TECH
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[0003] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of ambiguity-free acquisition method and device applicable to BOC (n, n) signal, to solve binary offset carrier (BOC) modulation technique in the prior art The autocorrelation function has multiple sub-peaks, which causes the problem of ambiguity in signal capture
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[0049] 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.
[0050] 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 invention provides a non-ambiguity capture method and device based on correlation displacement BOC (n,n). The method comprises the following steps: acquiring one path of in-phase signal and one path of orthogonal signal; obtaining an odd branch signal and an even branch signal; modding a complex signal I+jQ subjected to carrier stripping, multiplying the modeled result with the odd branch signal CO(t), and integrating to obtain -SO; taking negating hysteretic Tc / 2 sampling points to obtain -SOE; multiplying -SO by -SOE to obtain detection quantity SOE with an edge peak; modding SOE to obtain |SOE|; adding the SOE to the |SOE| to obtain non-ambiguity detection quantity; comparing the detection quantity with a detection threshold set by a decision device; if a detection value exceeds thedetection threshold, considering a signal to be accurately captured; if the detection value does not exceed the detection threshold, considering the signal not be accurately captured, and repeating the steps. According to the non-ambiguity capture method and the non-ambiguity capture device provided by the invention, on the base of a splitting reconstruction idea, BOC provided by the invention issplit into one path of odd unit signal and one path of even unit signal; two paths of signals and unit correlation functions of received signals are reconstructed; the multimodality is completely eliminated while the advantages of narrow correlation main peaks are retained, and the capture sensitivity is improved.
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)-based correlation shifting ambiguity-free acquisition method and device. Background technique [0002] At present, in order to make full use of the frequency band resources and enhance the anti-interference ability, the major satellite navigation systems in the world have proposed a new modulation method---binary offset carrier (BOC) modulation. Compared with BPSK modulation, the advantages of BOC modulation are mainly two aspects: First, BOC modulation first pre-modulates pseudo-random codes with square wave subcarriers, so that the signal spectrum is symmetrically split at the edge of the frequency band, and the separation distance varies with the modulation order. It changes with the change, making full use of the limited spectrum resources and reducing the interference between signals; second, its autocorrelation function h...
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IPC IPC(8): G01S19/29
CPCG01S19/29
Inventor 孙希延郝放纪元法甄卫民彭良福蔚保国甘兴利
Owner GUILIN UNIV OF ELECTRONIC TECH