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Fast capturing method of high-dynamic weak L1CP signal

A high dynamic and signal technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problem of high dynamic weak L1CP signal capture and other issues

Active Publication Date: 2018-05-01
NAT UNIV OF DEFENSE TECH
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  • Abstract
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Problems solved by technology

[0004] The present invention proposes a fast acquisition method of high dynamic weak L1CP signal, which is used to solve the problem of high dynamic weak L1CP signal acquisition in the presence of Doppler value and its rate of change value and cover code symbol reversal

Method used

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  • Fast capturing method of high-dynamic weak L1CP signal
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Embodiment Construction

[0028] The present invention is further described below. Among them, the splitting example of the matrix is ​​as follows:

[0029] Let the matrix Q: Split by odd and even rows, you can get two matrices Q1 and Q2 (assuming k=2j+1):

[0030] and

[0031] Experiments performed using the present invention are as follows. Carry out Monte Carlo simulation on the capture of L1CP signal, the experimental parameters are as follows figure 2 As shown, the experimental results are as image 3 shown. image 3 The abscissa of represents the carrier-to-noise ratio of the received baseband signal, and the ordinate represents the coherent gain, which represents the ratio of the signal-to-noise ratio of the coherent capture output to the input signal-to-noise ratio, and represents the increase of the signal-to-noise ratio during the capture process. Depend on image 3 It can be seen that when the carrier-to-noise ratio of the baseband signal is low (less than 40dBHz), the gain reac...

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Abstract

The invention provides a fast capturing method of a high-dynamic weak L1CP signal. The technical scheme comprises following steps: a step S1 of using a receiver to receive a satellite signal, carryingout down-conversion, sampling and demodulation on the received satellite signal to obtain a baseband signal; a step S2 of generating a local code sequence of the receiver; a step S3 of determining aparameter; a step S4 of segmented correlation on the baseband signal and a local pseudo code in the frequency domain; a step S5 of estimating a Doppler value and a Doppler rate-of-change value; and astep S6 of capturing a decision. By means of segmented correlation, a receipt signal is compensated through the estimated Doppler value and the estimated Doppler rate-of-change value, coherent loss brought by high dynamics can be effectively reduced, and the capturing performance is greatly improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation and positioning terminal equipment, in particular to a fast capture method with high dynamic weak signal capture capability. Background technique [0002] The purpose of satellite navigation signal acquisition is to realize the rough estimation of signal Doppler value and pseudo-code phase through the operation of the received signal, and then realize the tracking and demodulation of the signal. High dynamic weak signal capture has always been a difficult problem in the research of satellite navigation signal processing. For the capture of signals with weak characteristics, long-term coherent accumulation is required to obtain higher gain. Long-term coherent accumulation will give the acquisition of signals with high dynamic characteristics It causes a fatal impact, causing the correlation peak of the signal pseudo code to shift with time accumulation, and when the carrier has acceler...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/30
Inventor 刘小汇李子强黄仰博李柏渝唐璐杨安盼盼谢金石孙鹏跃左勇
Owner NAT UNIV OF DEFENSE TECH
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