Design of High Dynamic Short Burst Spread Spectrum Adaptive Signal Fast Capture System
In high dynamic environments,the transmission process of short burst signals often produces Puller frequency offset,increasing the acquisition time of spread spectrum signals,and even reducing the signal-to-noise ratio of signal acquisition.In order to achieve fast and effective acquisition of spread spectrum adaptive signals,a high dynamic short burst spread spectrum adaptive signal fast acquisition system is designed.The system hardware adopts a modular design approach to modify the signal receiving module and filtering module,and adjust the system circuit from two aspects:signal buffering and phase-locked loop.Supported by the hardware system,the characteristics of high dynamic short burst spread spectrum signals are determined through the simulation of the spread spectrum process,and the adaptive search of short burst spread spectrum signals in high dynamic environments is achieved through the feature matching.The capture length,frequency,threshold and other parameters are calculated to achieve the system's fast cap-ture function of short burst spread spectrum adaptive signals.The experimental results show that under the condition of no noise,the average signal-to-noise ratio of the optimized design system's output spread spectrum signal is 141.6,the average capture time is 8 s,and the average capture area is 90 km2;Under noisy conditions,the average signal-to-noise ratio of the system's output spread spec-trum signal is 121.8,the capture time is 10 s,and the capture area is 130 km2.
high dynamic short burst signalspread spectrum signaladaptive signal fast captureDoppler shift
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