断续谱线性调频信号特性仿真

Characteristic Simulation of Linear Frequency Modulation Signal with Discontinuous Spectrum

高频雷达工作的恶劣环境促使了对断续谱信号的研究。断续谱信号的频谱随着断续频带大小以及位置变化而变化,影响了断续谱信号的模糊函数。推导了断续谱线性调频信号的模糊函数,讨论了频带断续大小以及位置变化对距离模糊函数的影响,针对脉压后旁瓣较高的问题,采用失配滤波的方法进行旁瓣抑制,利用迭代最小二乘法对失配滤波器的系数求解。

The bad environment of high frequency radar promotes the research into discontinuous spectrum signal. The spectrum of discontinuous spectrum signal changes with the size and position of intermittent frequency band,which influences the ambiguity function of discontinuous spectrum signal. This paper deduces the ambiguity function of linear frequency modulation signal with dis-continuous spectrum, discusses the influence of frequency band discontinuous size and position change on the range ambiguity function, aiming at the problem that the side lobe after pulse com-pression is relatively high, adopts the mismatched filtering method to perform side lobe suppres-sion, uses the iterative least square method to solve the coefficients of mismatched filter.