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Binary offset carrier modulation signal side peak eliminating and main peak capturing method

A technology of modulating signal and shifting carrier wave, which is applied in the field of capture processing, can solve problems such as false capture and easy capture of wrong main peak, and achieve the effect of eliminating side peaks

Inactive Publication Date: 2014-07-02
HARBIN ENG UNIV
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Problems solved by technology

However, for the modulated signal of BOC (15, 2.5), since the difference between the heights of the main peak and the peaks on both sides is not very large, it is easy to capture the wrong main peak by using this method, and miscapture occurs.
(4) Auto-correlation side peak cancellation technology (ASPeCT—auto-correlationside-peak cancellation technique), by using the special characteristics between the square of the BOC autocorrelation function and the square of the BOC / PRN cross-correlation function to achieve the purpose of removing side peaks, but This method is only applicable to SinBOC(n,n) type

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  • Binary offset carrier modulation signal side peak eliminating and main peak capturing method
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  • Binary offset carrier modulation signal side peak eliminating and main peak capturing method

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Embodiment Construction

[0020] The following examples describe the present invention in more detail.

[0021] The method described in the present invention is a novel satellite modulation signal acquisition method, that is, the BOC modulation signal acquisition method. The invention uses a synthetic correlation function method. Compared with the general BOC modulation signal acquisition method, this method can completely remove the BOC modulation Signal-specific side peaks prevent signal side peaks from interfering with capture. The technical scheme of the present invention is as figure 1 As shown, the steps are as follows:

[0022] Step 1: Take a piece of 1ms IF signal data as the received data, and select an appropriate Doppler frequency shift range (ω Dmin ,ω Dmax ), and the search frequency step Δω D , and set the detection threshold γ at the same time.

[0023] Step 2: The data is subjected to carrier stripping processing, and the received data is mixed with the local replicated carrier to ...

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Abstract

The invention provides a binary offset carrier modulation signal side peak eliminating and main peak capturing method. The method includes the steps that (1) 1ms medium-frequency signals serve as received data, a Doppler frequency shift range is selected, stepped frequency is searched, and meanwhile a detection threshold value is set; (2) frequency mixing is carried out on the received data and local copy carriers, and signals with the carriers removed are obtained and undergo FFT processing; (3) 12 sub signals are generated locally due to decomposition of a BOC modulation signal, FFT is carried out, a conjugation is obtained, the received data are respectively multiplied by the conjugation, IFFT is carried out, and the results are stored; (4) needed 12 sub-formulas of an auxiliary formula are stored locally; (5) the position, where a self-correlation main peak of the signal is located, is determined, and the results of the step (3) and the results of the step (4) are correspondingly added; (6) correlated functions are transformed and reconstructed, the results are compared with a preset threshold value, and whether capturing is successful is judged. A side peak of the BOC (15, 2.5) modulation signal can be completely eliminated, and accordingly a receiver can well capture the main peak of the signal.

Description

technical field [0001] The invention relates to a receiver acquisition processing method in GNSS (Global Satellite Navigation System), in particular to an acquisition method of COMPASS (Beidou Navigation System) BOC (15, 2.5) modulation mode. Background technique [0002] The Beidou system is a satellite navigation system independently developed by my country. The entire Beidou project consists of three parts: the first step was completed in 2003, that is, to build a navigation test system with 3 Beidou navigation satellites - the Beidou-1 satellite navigation test system. The Beidou-2 satellite navigation system is currently under construction. It is a regional navigation system covering the entire Asia-Pacific region and providing navigation services for the entire Asia-Pacific region. The third step is to form a global navigation system in 2020 to provide navigation services for the whole world. [0003] With the gradual increase of satellite navigation systems, the sate...

Claims

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Application Information

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IPC IPC(8): G01S19/29G01S19/21
CPCG01S19/21G01S19/29
Inventor 沈锋韩浩桑靖刘明凯李伟东周阳兰晓明迟晓彤张金丽刘向峰
Owner HARBIN ENG UNIV
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