Coherent multi-carrier two-dimensional acquisition method, device, electronic device and storage medium

Abstract

The present invention relates to a coherent multi-carrier two-dimensional acquisition method, device, electronic equipment and storage medium. The method includes: acquiring a Doppler frequency offset / code phase offset two-dimensional search plane; for each received signal of a subcarrier signal, respectively Doppler frequency offset / code phase offset joint search is performed on each search unit of the two-dimensional search plane to determine the two-dimensional capture result of each subcarrier; coherently accumulate the two-dimensional capture results of all subcarriers to obtain multiple Carrier coherent accumulation of two-dimensional capture results; determine whether the capture is successful based on the correlation peak of the multi-carrier coherent accumulation two-dimensional capture result, and when the capture is determined to be successful, the Doppler frequency offset search amount and code phase offset corresponding to the correlation peak The search amount is used as the Doppler frequency offset and the code phase offset of the subcarrier respectively. The invention avoids the square loss introduced by sub-carrier non / differential coherent combination, improves the acquisition performance of multi-carrier direct sequence spread spectrum, and shortens the average acquisition time.

Description

technical field [0001] The present invention relates to the technical field of multi-carrier direct-sequence spread spectrum communication, in particular to a coherent multi-carrier two-dimensional acquisition method, device, electronic equipment and storage medium. Background technique [0002] Multi-carrier direct-sequence spread spectrum modulation (MC-DSSS) is a combination of multi-carrier modulation technology and direct-sequence spread spectrum technology. Compared with traditional single-carrier direct-sequence spread The spread spectrum and despread of the channel have higher frequency band utilization, and can achieve higher spread spectrum gain and larger spread spectrum bandwidth with lower complexity, thus effectively improving the concealment of spread spectrum signals and multiple access capabilities. [0003] In the multi-carrier direct sequence spread spectrum modulation technology, the design of the capture technology in the capture module of the communica...

AI Technical Summary

Problems solved by technology

[0004] The existing acquisition technology adopts non-coherent accumulation or differential coherent accumulation between subcarriers. These two accumulation methods will introduce combining loss when subcarriers are accumulated, and a "threshold effect" will appear in the case of low signal-to-noise ratio. , leading to a sharp drop in capture performance

In addition, the existing acquisition technology searches for Doppler frequency offset and transmission delay (code phase offset) separately in a serial manner, which is difficult to deal with the large dynamic problem of the satellite-ground link

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