摘要
在线性调频信号特征分析的基础上,提出了一种新的LFM信号检测器——调频斜率方差检测器,根据不同信噪比下调频斜率方差的概率密度分布情况,给出了该检测器的二元假设检验模型,并对比了在相同条件下该检测器与匹配滤波器的性能.仿真结果表明,调频斜率方差检测器是一种恒虚警概率检测器,在较低信噪比下可以有效检测线性调频信号,并对多普勒失配具有很好的适配性能.
Based on the characteristic analysis of the linear frequency modulation （LFM） signal, a new kind of detector towards LFM signal was put forward, which was called Variance-of-Frequency-Modulation - Slope Detector（VFMSD）. According to the probability density distribution of the varlance-of-frequency-modulation - slope in different SNR, the detector＇ s binary hypothesis testing mode was indicated, and then the property of VFMSD and that of matching filter （MF） were compared in the same condition. The result shows that VFMSD is a kind of constant false alarm rate detector（ CFAR detector）, which can detect LFM signal effectively in low SNR, and can adapt to the Doppler mismatch very well.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2007年第11期1844-1848,共5页
Journal of Harbin Institute of Technology
