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Method for solving crystal oscillator frequency deviation of receiver in receiving big-dipper satellite signals rapidly

A Beidou satellite and crystal oscillator frequency technology, which is applied in satellite radio beacon positioning systems, baseband systems, instruments, etc., can solve the problems of long capture time of satellite receivers and the inability to capture Beidou satellite signals, etc., achieving convenient implementation and application, The effect of preventing long capture time and ensuring timeliness

Active Publication Date: 2013-03-27
CHENGDUSCEON ELECTRONICS
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AI Technical Summary

Problems solved by technology

Once the amount of change is large, the acquisition time of the satellite receiver will be too long, and it will not even be able to capture the Beidou satellite signal

Method used

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  • Method for solving crystal oscillator frequency deviation of receiver in receiving big-dipper satellite signals rapidly
  • Method for solving crystal oscillator frequency deviation of receiver in receiving big-dipper satellite signals rapidly

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Embodiment

[0045] Such as figure 2 As shown, the method of the present invention for solving the receiver crystal oscillator frequency offset when receiving the Beidou satellite signal quickly comprises the following steps:

[0046] 1. Set the standard value of Doppler frequency shift

[0047] The frequency offset of the crystal oscillator is a slow changing process. It is quite stable for a period of time. It is not necessary to store and correct the small offset frequency values. Therefore, it is necessary to set a reasonable Doppler frequency shift standard value, which can effectively reduce the number of modifications to the frequency offset value of the receiver crystal oscillator, that is, reduce the write operation to the flash in the Beidou satellite receiver, thereby shortening the receiving time of the signal and improving the receiving efficiency. The present invention mainly receives GEO satellite signals, and after referring to the existing Doppler frequency shift value, ...

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Abstract

The invention discloses a method for solving crystal oscillator frequency deviation of a receiver in receiving big-dipper satellite signals rapidly. The method mainly comprises the following steps: (1) presetting a Doppler frequency shift standard value in a big-dipper satellite receiver; (2) capturing big-dipper satellite signals, and acquiring an initial Doppler frequency shift value; (3) comparing the initial Doppler frequency shift value with the preset Doppler frequency shift standard value, storing the Doppler frequency shift value and the corresponding crystal oscillator deviation value if the preset Doppler frequency shift standard value is exceeded; and discarding the Doppler frequency shift value reversely; and (4) starting up the big-dipper satellite receiver again, and correcting the big-dipper satellite receiver by calling the stored crystal oscillator frequency deviation value. According to the invention, through correcting the crystal oscillator frequency inventively, adverse effects to the rapid receiving of the big-dipper satellite signals by the crystal oscillator frequency deviation are solved effectively.

Description

technical field [0001] The invention relates to a Beidou satellite navigation receiver, in particular to a method for solving the receiver crystal oscillator frequency offset when receiving Beidou satellite signals quickly. Background technique [0002] BeiDou (Compass) Navigation Satellite System [BeiDou (Compass) Navigation Satellite System] is an independently developed and independently operated global satellite navigation system being implemented by China. my country plans to successively launch 5 geostationary orbit satellites and 30 non-geostationary orbit satellites to build a global Beidou satellite navigation system. In 2000, my country built the Beidou navigation test system, making my country the third country in the world to have an independent satellite navigation system after the United States and Russia. Around 2012, the Beidou satellite navigation system will first provide navigation, timing and short message communication service capabilities covering the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/00G01S19/27G01S19/29
Inventor 李斌李士庆覃光全
Owner CHENGDUSCEON ELECTRONICS
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