Signal capturing method based on frequency domain focusing and synthetic Fourier transform

Abstract

The embodiment of the invention provides a signal capturing method and device based on frequency domain focusing and synthetic Fourier transform, equipment and a computer readable storage medium. The method comprises the following steps: receiving a hopping spread signal; preprocessing the hopping spread signal to obtain an n-time sampling baseband digital signal; and de-spreading the n-times sampling baseband digital signal, and processing the de-spread signal based on a frequency domain focusing and synthetic Fourier transform mode to complete signal capture. In this way, rapid capture of the frequency hopping pattern / spreading code under the requirements of ultra-low signal-to-noise ratio and large dynamic condition indexes is achieved, and occupation of operation resources of an FPGA is greatly reduced.

Description

technical field [0001] Embodiments of the present disclosure generally relate to the field of signal acquisition, and more particularly, to a signal acquisition method, apparatus, device, and computer-readable storage medium based on frequency-domain focusing and composite Fourier transform. Background technique [0002] In the high dynamic and large frequency offset satellite communication system using the spread spectrum hopping communication system, the fast synchronization between the local frequency hopping pattern / spreading code of the satellite communication terminal and the system frequency hopping pattern / spreading code is the key to determine the ability of the satellite communication terminal. Whether it is the most critical link to successfully access the satellite communication system. At present, in the digital de-hopping / de-spreading acquisition module of traditional satellite communication terminals, the following three signal acquisition technical solutions ...

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Problems solved by technology

[0007] 1. Although the multi-hop fully coherent capture scheme has a high capture probability, it also has problems such as a high probability of false alarms, uneven integration results, multiple glitches, and a large consumption of FPGA computing resources.

[0008] 2. The intra-hop coherent and inter-hop non-coherent capture schemes have the problems of low capture probability and high consumption of FPGA computing resources

[0009] 3. The intra-bit coherent / inter-bit non-coherent acquisition scheme is suitable for jump-spread communication of static / low dynamic satellite users, but for ultra-low signal-to-noise ratio and large dynamic satellite communication application scenarios, the terminal FPGA consumed by this scheme The computing resources are very large, which cannot meet the index requirements of the ultra-high dynamic hopping spread spectrum satellite communication system

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