GNSS satellite signal acquisition method, device and satellite navigation receiver

A satellite signal and computer program technology, applied in the field of satellite positioning and navigation, can solve the problems of consuming hardware resources and time resources, long capture time, and low satellite capture efficiency

Inactive Publication Date: 2018-05-22
ARKMICRO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a GNSS satellite signal acquisition method, device, readable storage medium and satellite navigation receiver, aiming to solve the problem that FFT operation consumes a lot of hardware resources and time resources in the process of satellite signal acquisition in the prior art. The problem of low capture efficiency and long capture time

Method used

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  • GNSS satellite signal acquisition method, device and satellite navigation receiver
  • GNSS satellite signal acquisition method, device and satellite navigation receiver
  • GNSS satellite signal acquisition method, device and satellite navigation receiver

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Experimental program
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Effect test

Embodiment 1

[0039] see figure 1 , the method for acquiring GNSS satellite signals provided by Embodiment 1 of the present invention, said method includes the following steps: It should be noted that if there are substantially the same results, the method for acquiring GNSS satellite signals of the present invention does not use figure 1 The flow sequence shown is limited.

[0040] S101. Perform frequency mixing on the intermediate frequency discrete data according to the local intermediate frequency, the intermediate frequency discrete data is obtained by sampling the down-converted navigation signal at a sampling frequency, and the local intermediate frequency is the intermediate frequency after superimposing the Doppler frequency offset f IF .

[0041] Among them, the Doppler frequency offset is n*f step , n is an integer, n=0 in the first search, f step is the Doppler frequency step size, and the Doppler frequency step size is determined by the satellite type and the starting metho...

Embodiment 2

[0085] Embodiment 2 of the present invention provides a device for capturing GNSS satellite signals, the device comprising:

[0086] The frequency mixing module 11 is used to mix the intermediate frequency discrete data according to the local intermediate frequency, the intermediate frequency discrete data is obtained by sampling the down-converted navigation signal at the sampling frequency, and the local intermediate frequency is superimposed on the Doppler frequency The rear intermediate frequency;

[0087] A down-sampling module 12, configured to down-sample the data obtained after frequency mixing;

[0088] FFT module 13, is used for carrying out 2 to the data after down-sampling N Point FFT, the result is stored in the first storage unit, wherein, N is a natural number greater than or equal to 12;

[0089] A search module 14, configured to perform a parallel code phase search according to data read from the first storage unit;

[0090] Acquisition judging module 15, i...

Embodiment 3

[0097] Embodiment 3 of the present invention also provides a readable storage medium, the readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for acquiring GNSS satellite signals as provided in Embodiment 1 of the present invention is implemented. A step of.

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Abstract

The invention is applicable to the field of satellite positioning and navigation and provides a GNSS satellite signal acquisition method, device and a satellite navigation receiver. The method comprises steps: read signals and address information of a first storage unit storing 2<N> point FFT results are controlled to be outputted; through controlling the address information, data in the first storage unit are subjected to ring shift left readout or ring shift right readout; and according to the read signals and the address information, the data in the first storage unit are read. Thus, shiftof the read data is thus controlled through controlling the address, and movement of a search frequency point is further realized. A large amount of FFT operations can be avoided, the acquisition efficiency is improved, and the acquisition time is shortened.

Description

technical field [0001] The invention belongs to the field of satellite positioning and navigation, in particular to a method and device for capturing GNSS satellite signals and a satellite navigation receiver. Background technique [0002] At present, the Global Navigation Satellite System (GNSS) includes GPS of the United States, GLONASS of Russia, Galileo system of the European Union, and Beidou Navigation System (BDS) of China. GNSS aims to provide users with satellite navigation and positioning services around the clock . [0003] Taking the GPS system as an example, the basic components of the system include: the space segment, the ground control segment and the user segment. First, each satellite in the space segment transmits navigation signals to the ground control segment; then, the ground control segment receives and measures each satellite signal , and then determine the orbit of the satellite, and upload the orbit information of the satellite to the satellite, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/30G01S19/37
CPCG01S19/30G01S19/37
Inventor 阳金金严卫健刘俊秀石岭
Owner ARKMICRO TECH
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