Beidou satellite signal capturing method and device

Abstract

The invention provides a Beidou satellite signal capturing method and device. The method comprises steps of segmenting Beidou intermediate frequency signal data into a first block, generating a pseudocode, and segmenting the pseudo code into a second block; respectively carrying out fast Fourier transform of the first block and the second block, multiplying the result of the first block by a conjugate of the result of the second block, and carrying out reverse fast Fourier transform of a product result; filling the product result into a matrix, carrying out zero padding expansion to form a first matrix, carrying out Fourier transform of each column of the first matrix, taking an absolute value, and superposing the first matrixes; and capturing a Beidou satellite signal according to the element with the maximum numerical value of the first matrix. The method is advantaged in that the satellite signal capturing time is short, hardware resource requirements are few, precision is high, advantages of a Beidou system constellation can be used for preferentially capturing Beidou satellite signals, capturing of other constellations is assisted, and satellite signal capturing efficiency isimproved.

Description

technical field [0001] The invention relates to the field of navigation signal detection, in particular to a Beidou satellite signal acquisition method and device. Background technique [0002] The BeiDou (COMPASS) Navigation Satellite System is a global satellite navigation system independently developed and operated by China. It is also known as the world's four major satellite navigation systems together with the US GPS, Russia's GLONASS, and the EU's Galileo system. Compared with other satellite navigation systems, the space segment of the Beidou satellite navigation and positioning system is a mixed constellation consisting of satellites in three different orbits. The Beidou satellite navigation system has more high-orbit satellites and has stronger anti-shading capabilities. The priority acquisition of the Beidou system is conducive to the rapid solution of the base station system. [0003] The main methods of satellite signal capture are serial capture, parallel cap...

AI Technical Summary

Problems solved by technology

Serial capture means that in the process of capturing the pseudo code, the phase of one spread spectrum symbol is slid each time to carry out the correlation operation until the set correlation value is obtained, then the capture is successful and the code tracking is performed. The hardware implementation of this method is simple. It has been widely used in spread spectrum communication systems, but the capture time is long and the real-time performance is poor; in parallel capture, a correlator is set for each phase, and correlation operations are performed at the same time, and the phase with the same set correlation value is regarded as a successful capture Compared with serial capture, the capture time of parallel capture is greatly shortened, but it requires more hardware resources and is more complicated to implement; matched filter capture uses the principle of matched filtering to match the entire spread spectrum symbol Correlation to realize the capture of pseudocode, the capture time is short and easy to implement, but the capture method has low precision

Images