利用单频正弦调频信号的Bessel函数曲线特性抑制连续波雷达近距离信号

Close-in Signal Interference Suppression for CW Radar by Using Bessel Function Curves Characteristics of Single Frequency Sinusoidal FM Signal

连续波(CW)雷达没有近距离盲区,但存在近距离信号泄漏和目标强回波干扰问题,严重影响雷达的探测性能。针对该问题,提出了一种基于单频调频信号的贝塞尔函数曲线特性进行近距离信号抑制的方法。首先建立了调频发射信号回波及I、Q解调数学模型,推导了调频信号的贝塞尔函数曲线特性;其次阐述了如何选择合适的调频频率和调频指数,能够更好的解决近距离干扰问题;最后,针对设置的参数进行仿真,结果表明该方法有效。

There exists no close-in spots for continuous wave（ CW） radar,but its close-in signal leakage and strong echo will seriously affect the detection performance of radar. To solve the problem,a new close-in signal suppression method is proposed which is based on Bessel function curves characteristics of single frequency sinusoidal frequency modulation（ FM） signal. Firstly,an FM transmitter signal echo and I,Q de-modulator mathematical models are developed,and Bessel function curves characteristics of FM signal are derived. Then,how to choose suitable FM frequency and FM factor is expounded,which can solve the close-spots interference problem. Finally,simulation for parameter settings shows that this method is effective.