双基地雷达低空目标信号建模与电视“同步加白”信号的模糊函数研究

本文从目标探测的角度出发,首先建立了低空情况下,目标对双基地雷达接收站直行临近的回波信号模型。并对其进行了精度分析;在此基础上,又根据矩形脉冲的模糊函数。利用“叠加法”推出了电视“同步加白”信号模糊函数的数学表达式,并由此作出了单周期及多周期信号的模糊图及其在时间,频率轴上的交迹,从而使得对“同步加白”信号的探测性能有了更进一步的认识,也为今后利用此类信号进行探测研究奠定了基础。

A STUDY ON THE BUILDING UP OF MODELS AND THE AMBIGUITY FUNCTION OF "SYNC-PLUS-WHITE"SIGNAL OF TELEVISION-BASED BISTATIC RADAR AT LOW ALTITUDES

From the angle of target detection, the target echo model for a low altitude target rectilineally approaching the receiver of a bistatic radar is built up and its accuracy analyzed. On the basis of the model and the ambiguity function of rectangular pulse, the mathematical expression for the ambiguity function of "sync plus white" signal is derived using overlapping method, and the ambiguity plot and intersection of the signals in one and several periods at the time and frequency axis plotted. This makes the detectability of "sync plus white" signal well known and lays a foundation for further study on target detection using this kind of signals in the future.