基于二分法STFT的宽带信号检测算法研究

Study on the Broadband Signal Detection Algorithm Based on Dichotomy-STFT

本文提出了基于二分法的STFT算法对宽带雷达信号进行检测。首先,对STFT方法中窗函数的选择和窗口滑动步长等关键环节进行了仿真对比分析。然后,提出了基于二分法的STFT算法,确定信号起始时刻所处数据段,并对信号起始时刻进一步测量,提高检测精度。最后,采用二分法STFT算法对带宽200MHz的宽带LFM信号进行仿真分析,检测时间精度可以达到62.5ns。该算法综合考虑了计算量与检测精度要求,可对宽带雷达信号进行快速精确检测。

The dichotomy-STFT algorithm is used to detect the radar broadband signal. Firstly, the key links of window function selection and window sliding step in STFT method are compared and analyzed. Then, the STFT algorithm based on dichotomy is proposed, and the data segment of the signal start time is determined in this paper. Through the dichotomy-STFT algorithm, the signal start time is further measured, and the detection accuracy is improved. Finally, the dichotomy-STFT algorithm is used to simulate and analyze the broadband LFM signal with 200 MHz bandwidth, and the detection time accuracy can reach 62.5 ns. The dichotomy-STFT algorithm takes into account the requirements of calculation and detection accuracy, and the wideband radar signal can be detected quickly and accurately.