Satellite signal capturing method and device

A satellite signal capture and satellite signal technology, applied in the field of communication, can solve problems such as low efficiency and slow satellite signal capture speed

Inactive Publication Date: 2017-01-04
SPACE STAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a satellite signal acquisition method and device, which is used to solve the problem that the satellite signal acquisition speed of the receiver is relatively slow and the efficiency is low in the prior art

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  • Satellite signal capturing method and device
  • Satellite signal capturing method and device
  • Satellite signal capturing method and device

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Embodiment Construction

[0052] An embodiment of the present invention provides a satellite signal acquisition method, the method comprising: acquiring a satellite signal, and performing signal processing on the satellite signal to obtain an intermediate frequency digital signal corresponding to the satellite signal, and performing carrier de-carrier down-conversion on the intermediate frequency digital signal Sampling to obtain 2L point baseband satellite signals, complex multiplication of the obtained 2L local pseudo-code frequency domain extension signal and M inverse Fourier IFFT modules to obtain M point time domain signals, and pass Fourier The transform FFT module performs Fourier transform on the M-point time-domain signal, and obtains a parallel Doppler search result under a code phase; performs peak detection on the Doppler search result, obtains the maximum point, and records the maximum point Code phase and Doppler value; according to the verification result of the code phase and Doppler va...

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Abstract

The invention discloses a satellite signal capturing method and device which achieve fast and real-time capture by a code parallel and frequency parallel search method. The satellite signal capturing method and device can be applied to military codes and civilian codes with the same rate, improve the sensitivity without increasing the resources. The whole process can be realized in a FPGA, which is beneficial to the miniaturization design of a receiver. The method of the invention is applicable to the receiver terminals of satellite navigation systems such as Beidou, GPS and the like, and has strong practicability.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular to a satellite signal acquisition method and device. Background technique [0002] The main task of the receiver is to receive and process the signals transmitted by the satellites to obtain navigation messages and observations. To accomplish these tasks, the first thing to do is to capture satellite signals. Navigation satellite signal acquisition is a two-dimensional search process for the carrier frequency and pseudocode phase of the received signal. When the local reference sequence and the satellite signal are roughly synchronized and the frequency is approximately equal, a correlation peak will be generated, and it will be judged whether it is completed. capture. [0003] The sensitivity and speed of capture directly determine how strong the receiver can capture the signal and how much dynamics it can adapt to. It can capture satellite signals in real ...

Claims

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Application Information

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IPC IPC(8): G01S19/24G01S19/29G01S19/30
CPCG01S19/24G01S19/29G01S19/30
Inventor 魏婵娟张爽娜董启甲李东俊
Owner SPACE STAR TECH CO LTD
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