Flash break recapturing system and method of satellite receiver signal

A satellite receiver and signal technology, applied in the field of satellite receivers, can solve the problems of time-consuming and low signal efficiency, and achieve the effect of short capture time and narrowed search range

Inactive Publication Date: 2009-11-25
BEIJING BDSTAR NAVIGATION CO LTD
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AI Technical Summary

Problems solved by technology

At present, the commonly used signal flash recapture is to search according to the initial acquisition method again to complete the flash recapture. The process is to perform ±10kHz Doppler frequency and 1023 code phases on the received satellite signal The two-dimensional search, such a recapture process is very time-consuming, and the efficiency of capturing signals is not high

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  • Flash break recapturing system and method of satellite receiver signal
  • Flash break recapturing system and method of satellite receiver signal
  • Flash break recapturing system and method of satellite receiver signal

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Embodiment Construction

[0034] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention.

[0035] In the process of flash recapture, it is necessary to judge the occurrence of flash, and then perform flash recapture. The system judges whether there is a flash by detecting the change of the magnitude of the correlation value R(m).

[0036] (1) Flash judgment process

[0037] Under normal circumstances, the magnitude of the correlation result R(m) at the mth correlation is relatively large. When the signal flickers, the magnitude of the correlation value R(m) drops rapidly, which is basically white noise. Therefore, whether there is a flicker can be judged by detecting the change of the magnitude of the correlation value R(m).

[0038] The specific method ...

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Abstract

The invention discloses a flash break recapturing system and method of the satellite receiver signal, capable of shortening the time for recapturing the signal when the flash break takes place. The method comprises: via real-time estimation, obtaining the related amplitude value under the normal condition, and recording the pseudo-code phase and the downstream signal Doppler frequency; calculating a plurality of continuous related peak; judging that the signal flash break takes place if the plurality of related peak is below the related amplitude value; obtaining the Doppler frequency estimated value during the flash break recapturing period according to the downstream signal Doppler frequency and the variation velocity; setting the search range and search step-size of the Doppler frequency according to the pseudo-code phase and the Doppler frequency estimate(d) value; conducting the carrier and code phase search according to the search step-size and the related operation to obtain the correlative value; the signal flash break being over if the plurality of continuous correlative value amplitude is more than the predetermined recapturing threshold. The invention can recapture quickly to the satellite signal after the signal flash break, and the capture time is short in the recapture.

Description

technical field [0001] The invention relates to a satellite receiver, in particular to a satellite receiver signal flash-off recapture system and method. Background technique [0002] In actual satellite-to-ground communication, factors such as ionospheric jitter and sudden changes in the atmosphere will cause the receiver's carrier-locked loop and delay-locked loop to lose lock. At this time, it is necessary to recapture the downlink signal to obtain a new pseudo-code phase , Doppler frequency estimation. [0003] In the flash recapture process of the satellite-ground communication signal, it is first necessary to determine the occurrence of the flash, and then perform the flash recapture to judge the end of the flash, so that the loop enters the normal tracking state. At present, the commonly used signal flash recapture is to search according to the initial acquisition method again to complete the flash recapture. The process is to perform ±10kHz Doppler frequency and 102...

Claims

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Application Information

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IPC IPC(8): G01S1/02G01S5/02
Inventor (请求不公开姓名)
Owner BEIJING BDSTAR NAVIGATION CO LTD
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