基于驻相法的一种雷达调频信号频谱分析  

Spectrum analysis of radar FM signals based on stationary phase method

作　　者：周旭广 杨志强[1] 吴前垠 

机构地区：[1]93897部队 [2]93856部队

出　　处：《空军预警学院学报》2015年第3期177-179,183,共4页Journal of Air Force Early Warning Academy

摘　　要：为从频域上研究双曲调频(HFM)信号特性,运用驻相法推导其频谱表达式,绘出近似频谱图;再利用匹配滤波器的频域输出与雷达发射信号频谱之间的固有关系,通过傅里叶逆变换,得到HFM回波经过匹配滤波后的时域输出.最后,分别对HFM信号作FFT运算和对目标回波进行匹配滤波运算仿真,得到相应的频谱和脉压结果,与驻相法推导的结果相符.研究结果说明,驻相法分析HFM信号的脉压性质是一种更为简单有效的方法.To study the characteristics of hyperbolic frequency modulated（HFM） signals in frequency domain, this paper deduces the spectrum expression of the signals by applying to the stationary phase method,plots an approximate spectrogram, and obtains the HFM echoes＇ output after matched filtering in time domain, by using the inherent relationship between the match filter＇s output in frequency domain and the spectrum of radar signal transmitted and Fourier inverse transform. And finally, the simulations of conducting the FFT operation on HFM signals and matched filtering operation on the target＇s echoes are performed respectively, thus acquiring the results of corresponding spectrum and pulse compression, and conforming to those derived from the stationary phase method. Research results illustrate that the stationary phase method is simpler and more effective in analysis of the properties of HFM signal pulse compression.

关 键 词：雷达调频信号 双曲调频信号 驻相法 信号频谱 匹配滤波 

分 类 号：TN957.51[电子电信—信号与信息处理]