复合线性调频信号的模糊函数分析

摘要

In order to improve the joint distance-velocity-resolution of the single slope linear frequency modulation (LFM) ,a composed linear frequency modulation radar signal composed of chirp up and chirp down slopes is proposed. The ambiguity functions of the composed linear frequency modulation signal and the single slope linear frequency modulation signal are deduced and analyzed. The simulations of the two kinds of signals about the ambiguity function, - 3 dB ambiguity graph, distance ambiguity graph and velocity ambiguity graph have been presented and compared. The differences of them show that the composed linear frequency modulation radar signal has a better performance on velocity resolution and joint distance-velocity-resolution than the single slope linear frequency modulation radar signal.%为提高单斜率线性调频信号的距离速度联合分辨力,提出了一种正负双斜率的复合线性调频信号,推导并分析了该信号的模糊函数.仿真得到了复合线性调频信号以及单斜率线性调频两种信号的模糊函数图、-3 dB模糊度图、距离模糊函数图以及速度模糊函数图,对比研究发现复合线性调频信号相对单斜率线性调频信号具有更好的速度分辨力和距离速度联合分辨力.