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High-speed GPS receiver signal capture method

A technology of GPS receiver and signal capture, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of unfavorable GPS signal fast capture, etc., to solve the problem of GPS signal capture and meet the requirements of real-time, The effect of increasing the capture speed

Inactive Publication Date: 2014-10-01
BEIJING INFORMATION SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Code phase estimation and Doppler frequency shift estimation are the main factors affecting the detection probability, therefore, this case is not conducive to the rapid acquisition of GPS signals

Method used

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  • High-speed GPS receiver signal capture method
  • High-speed GPS receiver signal capture method
  • High-speed GPS receiver signal capture method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In order to compare and analyze the capture effect of the traditional FFT capture algorithm and the improved algorithm, the traditional FFT capture algorithm is first used to search for the PRN=22 satellite signal, in which the signal center frequency of the intermediate frequency digital signal is 0.42MHz, and the sampling frequency It is 4.092MHz, and the Doppler frequency shift search step is 500Hz. The capture result is attached image 3 And attached Figure 4 : The code phase is 2250, the base code phase is 562 according to formula (2), and the Doppler frequency shift is 40kHz.

Embodiment 2

[0051] The improved acquisition algorithm is used to search for the satellite signal of PRN=22. The signal center frequency of the intermediate frequency digital signal is 0.42MHz, the sampling frequency is 4.092MHz, and the Doppler frequency shift search step is 500Hz.

[0052] According to step 1, the speed of the carrier at time T provided by the inertial navigation system is 6600m / s, and the speed of PRN=22 satellite provided by the ephemeris data at time T is 929m / s. , from formula (1) to get =39.5KHz. use Drive the local digitally controlled oscillator, and determine the search range of the Doppler frequency shift at T+1 as [39.0KHz, 40.5KHz].

[0053] According to step 2, perform local code Sampling, taking 1ms data, there are 4092 data points, the sampling factor M is 4, that is, a point is taken every three points to form a new sequence ,in . By padding a sequence of zero pairs Take the conjugate after FFT operation.

[0054] According to step 3, the i...

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Abstract

Provided is a high-speed GPS receiver signal capture method. A capture loop is assisted through inertia information and ephemeris information, Doppler frequency shift at the next moment is forecasted, the frequency range of GPS signals is estimated in advance, and Doppler frequency is searched for within the range; before a complex signal and a local code sequence of a base band are subjected to FFT operation, extraction processing with the extraction factor of M is performed, and then iteration is performed on the value of M according to the capture result till capture succeeds. According to the method, operand is reduced by reducing the number of operation points of FFT. According to the method, the operand is reduced by reducing the number of operation points of the FFT, meanwhile, the frequency search time is shortened, and high-dynamic GPS signals can be fast captured.

Description

technical field [0001] The invention belongs to the technical field of signal capture in satellite navigation, in particular to a signal capture method for a high-speed GPS receiver. Background technique [0002] GPS (Global Position System) is a satellite navigation system that can provide users with real-time, continuous, high-precision position, speed and time information around the world around the clock, and its main terminal equipment is a GPS receiver. GPS signal acquisition is one of the key technologies of GPS receivers, which directly affects the follow-up tracking of signals and the calculation of positioning data, and determines the performance of the receiver. [0003] There are two main methods for capturing C / A codes in existing GPS receivers: one is the serial search and capture method based on the time domain. Fast acquisition and positioning of the receiver; the other is the FFT-based parallel acquisition method, which reduces the amount of computation by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/254G01S19/258
Inventor 李擎王超亮苏中付国栋孙晓溪刘宁
Owner BEIJING INFORMATION SCI & TECH UNIV
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