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Method and device for capturing GPS weak signals

A technology for weak signal capture and signal reception, which is applied in measuring devices, satellite radio beacon positioning systems, instruments, etc., can solve the problem of low utilization rate of received signals, inability to completely overlap each correlation peak, and inability to accurately judge the occurrence of data bit jumps Position and other issues, to achieve the effect of solving incomplete overlapping and improving utilization

Active Publication Date: 2018-12-18
CHINA MOBILEHANGZHOUINFORMATION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method and device for capturing weak GPS signals, which are used to solve the problems of low utilization rate of received signals by the traditional half-bit method, inability to completely overlap each correlation peak due to code phase slip of the received signal, and inability to accurately judge the occurrence of data bit jumps location problem

Method used

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  • Method and device for capturing GPS weak signals
  • Method and device for capturing GPS weak signals
  • Method and device for capturing GPS weak signals

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiments of the present invention provide a method for capturing weak GPS signals, such as figure 1 shown, including the following steps:

[0049] S11: Capture a received signal within a predetermined length at a predetermined carrier frequency point, and perform carrier stripping on the received signal, where the predetermined length is not less than 32ms.

[0050] In order to process the received signal conveniently, it is necessary to perform carrier stripping processing on the received signal after receiving the received signal, so as to remove the carrier.

[0051] Specifically, the predetermined length may be equal to 32ms or greater than 32ms.

[0052] S12: Generate the C / A code of the predetermined length with the same phase, and correct the code phase of the C / A code.

[0053] The C / A code is a pseudo-random code with a cycle of 1 ms, and the code phase of each cycle is the same. The length of the generated C / A code is also a predetermined length, which en...

Embodiment 2

[0074] If the target non-coherent integration result is not greater than the threshold value, it means that the currently captured received signal is not a satellite signal. On the basis of the above embodiments, in the embodiment of the present invention, if it is determined that the target non-coherent integration result is not greater than the threshold value, then Tag capture failed.

[0075] If the acquisition fails, it means that the received signal captured at the current predetermined carrier frequency point is not a satellite signal. In order to successfully capture the satellite signal, the carrier frequency point can be reset, and the reset carrier frequency point can be used as the predetermined carrier frequency point, and then perform the steps S11-S17 re-acquisition of weak GPS signals.

Embodiment 3

[0077] In order to reduce the amount of calculation and improve the efficiency of signal capture, on the basis of the above embodiments, in the embodiment of the present invention, the correction of the code phase of the C / A code includes:

[0078] Obtain the code phase correction amount of each cycle of the C / A code according to the following formula;

[0079] k is a positive integer not greater than the predetermined length; where N k Indicates the correction amount of the kth period, T indicates 1ms, f s Indicates the sampling frequency of the received signal, f d Indicates the predetermined carrier frequency point, f L1 Indicates the L1 band carrier frequency;

[0080] Correct the C / A code of each period according to the obtained code phase correction amount of each period, where N k If it is greater than 0, the code phase of the C / A code of the kth period is cyclically shifted to the left by N k bit; if N k Not greater than 0, the code phase of the C / A code of the...

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Abstract

The invention discloses a method and device for capturing GPS weak signals. The method comprises the steps that receiving signals within the preset length are captured at a preset carrier wave frequency point, and the receiving signals are subjected to carrier wave stripping; C / A codes with the preset length are generated, and code phases of the C / A codes are corrected according to the preset carrier wave frequency point; the receiving signals subjected to carrier wave stripping and the corrected C / A codes are divided and overlaid, and 5N sections of first data of 16 ms and 5N sections of second data of 16 ms are obtained to be subjected to coherent integration; coherent integration results are divided into five groups according to the set interval, all the sets of coherent integration results are subjected to inherent integration, and five inherent integration results are obtained; and according to the maximum value and the minimum value in the five inherent integration results, the position of jumping change is accurately judged, and final capturing is completed. According to the method and device, the utilization rate of the receiving signals is high, and the influences of Doppler frequency shift of the C / A codes and noise are lowered.

Description

technical field [0001] The invention relates to the field of global positioning system weak signals, in particular to a method and device for capturing weak signals of a global positioning system (Global Positioning System, GPS). Background technique [0002] GPS has been widely used at present, has the characteristic that navigation error does not diverge with time, and can provide users with accurate position, speed, time and other information on a global scale. However, in low signal-to-noise ratio environments such as forests, urban valleys, and indoors, the satellite signal is relatively weak, and the GPS receiver may not be able to successfully capture the satellite signal, and its follow-up navigation function will not be realized at this time. [0003] In order to improve the GPS receiver's ability to capture weaker satellite signals, the most effective method is to extend the coherent integration time of satellite signals. Considering that the navigation data in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24G01S19/30
CPCG01S19/24G01S19/30
Inventor 王嘉榕陈思聪刘香香
Owner CHINA MOBILEHANGZHOUINFORMATION TECH CO LTD
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