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Unambiguous GNSS satellite navigation signal tracking method

A satellite navigation signal and unambiguous tracking technology, which is applied in the field of global navigation satellite systems, can solve the problems of easy false detection and missed detection in tracking, and achieve the elimination of multi-peak characteristics, avoid false detection and missed detection problems, and related calculations small effect

Active Publication Date: 2014-04-30
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a method for unambiguous tracking of GNSS satellite navigation signals, which solves the problem that there are multiple secondary peaks in the correlation function of the BOC modulation signal, which is easy to generate when the received satellite navigation signals are captured and tracked. The problem of false detection and missed detection

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  • Unambiguous GNSS satellite navigation signal tracking method
  • Unambiguous GNSS satellite navigation signal tracking method
  • Unambiguous GNSS satellite navigation signal tracking method

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Embodiment Construction

[0031] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0032] A method for unambiguous tracking of GNSS navigation signals in an embodiment of the present invention, such as figure 1 shown, including the following steps:

[0033] Step 1: Multiply the received satellite navigation signal with the local carrier, perform carrier stripping (that is, signal demodulation), and then undergo secondary mixing to obtain the intermediate frequency input signal;

[0034] Step 2: Perform discrete Fourier transform DFT on the intermediate frequency input signal obtained in step 1 to obtain the frequency domain received BOC signal re_boc_fft;

[0035] For BOC(m,n) modulated signals, the spreading code rate is f c =n×f 0 , the subcarrier frequency is f sb =m×f 0 , f 0 = 1.023MHz. Each spreading code chip contains k=2×m / n subcarrier half periods, and the number of sampling points of each 1 / 2 subcarrier cycle chip of BOC modul...

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Abstract

The invention relates to an unambiguous GNSS satellite navigation signal tracking method. In order to cancel secondary peaks of related functions of BOC signals of a GNSS, the unambiguous signal tracking method is adopted. Because subcarriers are used in the generation process of BOC modulating signals, the secondary peaks of the related functions of the BOC modulating signals appear; the received BOC signals and local BOC signals are transformed so as to approach BPSK modulating signals without subcarrier modulation, the related function with a single peak like the BPSK modulating signals is obtained in lower complexity, so the ambiguity of the subsequent capturing process and a tracking loop are cancelled, and the purpose of unambiguous signal tracking is achieved.

Description

technical field [0001] The invention belongs to Global Navigation Satellite System (GNSS), and in particular relates to a method for unambiguous tracking of GNSS satellite navigation signals, aiming at binary offset carrier modulation (BOC) signals to realize unambiguous tracking of signals. Background technique [0002] The Global Navigation Satellite System (GNSS) is a global position and time measurement system, which is widely used in civil and military fields because it can provide high-precision, global, and all-weather navigation services. With the rapid development of modern GNSS, the modern GPS system in the United States and the Galileo system in Europe have adopted new satellite navigation signals, such as high-order BOC (kn,n) signals (k≥2), MBOC, AltBOC, etc. Compared with traditional BPSK-modulated satellite navigation signals, the binary offset carrier (BOC) modulation technology can concentrate the signal energy on the edge of the frequency band, make full us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29
CPCG01S19/29
Inventor 赵亮翟建勇
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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