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Devices and methods for fast catching signal in high dynamic satellite navigation receiving machine

A satellite navigation and receiver technology, applied in satellite radio beacon positioning system, measuring device, beacon system using radio waves, etc., can solve the problems of long capture time and high hardware cost, so as to avoid capture and ensure stability performance, reducing complexity

Inactive Publication Date: 2007-12-05
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

The acquisition of highly dynamic satellite signals is essentially a two-dimensional search process of the received signal on the code phase and Doppler frequency offset. The traditional sliding serial search acquisition strategy is simple and requires less hardware resources, but the acquisition time Long; and based on the traditional matched filter capture strategy, the capture speed is fast, but the hardware overhead is large

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  • Devices and methods for fast catching signal in high dynamic satellite navigation receiving machine
  • Devices and methods for fast catching signal in high dynamic satellite navigation receiving machine
  • Devices and methods for fast catching signal in high dynamic satellite navigation receiving machine

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Embodiment Construction

[0040]The present invention is a key component in the high dynamic satellite navigation receiver, it realizes the fast and accurate capture of the high dynamic satellite signal, makes the local code and the carrier and the received signal realize rough synchronization, and carries out a certain adjustment to the Doppler frequency deviation Accuracy estimation, so as to assist the subsequent part of the processing module in the satellite navigation receiver (fine tracking, PVT solution, etc.). In the embodiment, two-stage cascaded filter extraction is used to reduce the data rate, and the correlation values ​​of all code phases are obtained within one spread spectrum code period by segmented matched filter, and the Doppler is compensated by changing the intermediate frequency value of the down-converter Frequency offset, and the envelope is detected and judged by a non-coherent accumulation detector, which can quickly capture the signal, preliminarily determine its code phase po...

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Abstract

The invention discloses a signal rapid-capturing device and method in the high-dynamic satellite navigational receiver based on segmented mated filter, which comprises the following parts: frequency converter, low-pass filter, extractor, segmented mated filter, envelope calculator, incoherent signal accumulated tester and central controller, wherein the mated filter searches the entire code phase within time T in relative to integral, which obtains a relative result of all code phases under one Doppler frequency deviation to improve signal-to-noise ratio through incoherent signal accumulated tester, in order to judge whether the signal exists; the central frequency is changed by frequency converter to do frequency shaft stepping research. The invention can transmit two-dimensional research on the traditional code phase and Doppler frequency deviation into one-dimensional research on the Doppler frequency deviation, which improves the capture speed of signal greatly to save hardware resource through the design of the segmented mated filter.

Description

technical field [0001] The invention relates to a device and method for fast capturing of signals in a high dynamic satellite navigation receiver. Background technique [0002] High dynamic satellite navigation technology has a wide range of applications in modern military, aerospace, aviation and other fields, and is of great significance to national security. So far, foreign high-performance fighters, advanced missiles and other weapons have been guided by high-performance high-dynamic satellite navigation receivers. Benefits; at the same time, the high dynamic satellite navigation system is the most ideal navigation system for space shuttles and spacecraft. The existing satellite navigation systems include the GPS system of the United States and the GLONASS system of Russia. Europe is also actively developing its own Galileo satellite navigation system. Autonomous satellite navigation systems (such as the Beidou satellite navigation system). With the deepening of resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/02G01S5/02G01S19/38
Inventor 俞晨晟赵民建许峰张浩
Owner ZHEJIANG UNIV
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