基于瞬时频率估计的双曲调频信号检测技术

Hyperbolic frequency modulated signal detection based on instantaneous frequency estimation

基于双曲调频信号的特征分析,提出了一种新的HFM信号检测方法——周期斜率方差检测器。根据不同信噪比下周期斜率方差的概率密度,给出了该检测器的二元假设检验模型,并对比了相同条件下该检测器与匹配滤波器的性能。仿真结果表明,周期斜率方差检测器是一种恒虚警概率检测器,在较低信噪比下可有效检测双曲调频信号,并对多普勒失配有很好的适配性。

Based on the characteristic analysis of hyperbolic frequency modulated （HFM） signal, a new kind of detector towards HFM signal was put forward, which was called Variance -of- Period -Slope Detector, VPSD for short. According to the probability density of the variance - of - period - slope in different SNR, the detector＇s binary hypothesis testing mode was indicated, and then the property of VPSD and that of matching filter （MF） were compared in the same condition. The simulation result shows that VPSD is a kind of constant false alarm rate detector, which can detect HFM signal effectively in low SNR, and can adapt to the Doppler mismatch very well.