Signal capturing method under high-dynamic low signal-to-noise ratio (SNR) environment

Abstract

The invention provides a signal capturing method under high-dynamic low signal-to-noise ratio (SNR) environment. The method is suitable for a frequency spectrum or frequency-hopping spread system, andcomprises the following steps: S1, decomposing long-time data into N sub-data sections, performing coherent integral on the sub-data sections and the local code with the corresponding length througha correlator to obtain N groups of integral values, wherein N is power of 2; S2, determining K groups of time domain interpolations according to a frequency analysis range of the FFT and the requiredfrequency domain analysis range, performing interpolation operation on N groups of integral values of the correlator on the time domain to acquire K groups of segmented coherent interpolation data foreliminating time domain sequential feature; and S3, performing coherent accumulation on each group of segmented coherent interpolation data to obtain the FFT operation required count form the obtained K groups of data, performing K-times FFT operation according to the accumulation result to obtain the frequency domain information. The resource consumption is greatly reduced through the signal capturing method provided by the invention.

Description

technical field [0001] The invention relates to spread frequency hopping communication and spread spectrum communication technology of aerospace products, in particular to a signal acquisition method in a high dynamic and low signal-to-noise ratio environment. Background technique [0002] In the 1970s, the research on spread spectrum communication was also started in China, and until now there have been more in-depth theoretical researches on direct spread and frequency hopping technology. my country's military communication system is also gradually changing from narrowband communication and ordinary frequency hopping to a more advanced direct spread / frequency hopping hybrid anti-jamming technology system. [0003] In terms of satellite communication and measurement and control, spread spectrum technology is the most basic anti-jamming technology in satellite communication. At present, spread frequency hopping technology has been widely used in both military and civilian a...

AI Technical Summary

Problems solved by technology

Due to the high complexity of spread frequency hopping and spread spectrum system correlators, and the long correlation events due to the purpose of anti-interference communication, in the case of limited processing resources, in order to obtain high coherent integration gain, it is impossible to balance Its highly dynamic application scenarios

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