Binary offset carrier signal tracking loop

A technology of carrier tracking loop and carrier offset, which is applied in the phase modulation carrier system, radio wave measurement system, satellite radio beacon positioning system, etc., can solve the problem of not fully utilizing the subcarrier periodicity and the anti-multipath performance of the peak jump method Poor, weak signal tracking stability and other problems, to achieve the effect of improving tracking stability, eliminating tracking ambiguity, and increasing the dynamic range

Inactive Publication Date: 2010-09-08
BEIHANG UNIV
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Problems solved by technology

However, in practice the spacing of the correlation peaks increases slightly as the winger moves away from the main peak
[0007] (3) The anti-multipath performance of

Method used

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  • Binary offset carrier signal tracking loop
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  • Binary offset carrier signal tracking loop

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Embodiment

[0078] Take the tracking loop implementing BOC (15, 2.5) as an example to illustrate, the spreading code period is 2ms, and the subcarrier frequency f sc =15*1.023MHz, spreading code rate f c =2.5*1.023MHz, IF carrier frequency f IF = 46.52MHz.

[0079] This embodiment is implemented on a hardware platform with FPGA+DSP as the core. The FPGA selects VC4VSX55 ​​in the VIRTEX-4 series of Xilinx Company, and the DSP is a floating-point type TMS320C6713 of TI Company. The correlator module 1 is implemented in FPGA, and the phase detector unit 2 and filter module 3 are implemented in DSP.

[0080] Carrier numerically controlled oscillator 105, subcarrier numerically controlled oscillator 106, and spread spectrum code numerically controlled oscillator 107 generate local sine-cosine signals and spread spectrum code sequences of the same frequency as the intermediate frequency carrier and subcarrier. Each time the numerically controlled oscillator overflows, a recurring carrier cyc...

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Abstract

The invention discloses a binary offset carrier signal tracking loop, which comprises a correlator module, a phase discriminator unit and a filter unit. The correlator module is used for performing demodulation and despread processing on the input intermediate frequency BOC signals, and acquiring multi-path correlation values IIP, IIE, IIL, IQP, IQE, IQL and QIP between local signals and the intermediate frequency BOC signals; the phase discriminator unit is used for detecting the tracking error theta of the carrier phase and the subcarrier phase and measuring the tracking error tau of the spreading codes; and the filter unit is used for performing noise reduction and smoothing on the phase demodulation result, converting the output tracking error into corresponding frequency control words, correspondingly feeding the frequency control words back to the correlator module, tracking the input intermediate frequency BOC signals, and closing the tracking loop. The binary offset carrier signal tracking loop realizes the split tracking of the subcarrier and spreading codes, eliminates the tracking fuzziness of the BOC signals, reduces the requirement on the acquisition precision, improves the tracking performance of weak signals, widens the dynamic range of the loop, and improves the tracking stability of the BOC signals by using the periodicity of the subcarrier.

Description

technical field [0001] The invention belongs to the technical field of GNSS signal processing, and in particular relates to a binary offset carrier signal tracking loop. Background technique [0002] The satellite navigation signals of the new generation of GPS system, Galileo system and China's BD2 system will generally adopt binary offset carrier (BOC) modulation technology. Compared with the traditional BPSK modulation method, the BOC modulation method has the advantages of improving the utilization of the navigation frequency band, suppressing signal multipath errors, reducing signal coherence loss, improving pseudo-range measurement accuracy, and enhancing signal anti-interference performance. However, due to the multi-peak characteristic of the autocorrelation function of the BOC signal, the tracking loop may be wrongly locked on the winger, that is, the so-called "false lock" phenomenon (tracking ambiguity) occurs. In order to eliminate the ambiguity of BOC signal tr...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04L27/18G01S19/29G01S19/35
Inventor 杨再秀耿生群黄智刚农晓东宋超张婧雯
Owner BEIHANG UNIV
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