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根据非合作双基地雷达系统的特点,讨论了非合作双基地雷达的基本几何关系与信号能量关系,提出了采用中频数字化技术在频域上实现参考通道与目标通道的快速互相关检测的方法,并在仿真实验中模拟了噪声背景中直达波与目标散射回波的互相关检测与时差估计的过程,实验表明该方法能够在参考通道与目标通道的信噪比相差十分悬殊的情况下,有效地完成微弱目标的检测。蒙特·卡罗仿真分析了信噪比、信号脉宽、带宽和相关脉冲数对互相关时差估计性能的影响。
According to the characteristics of noncooperative bistatic radar system, the relationship between basic geometric relation and signal energy of noncooperative bistatic radar is discussed, and a method of fast cross-correlation detection between reference channel and target channel by using IF digitization technology is proposed. In the simulation experiment, the cross-correlation detection and the time difference estimation between the direct wave and the target scattering echo are simulated. The experimental results show that this method is effective in the case of very poor signal-to-noise ratio between the reference channel and the target channel To complete the detection of weak targets. Monte Carlo simulation analyzes the effect of signal-to-noise ratio, signal pulse width, bandwidth and number of correlated pulses on cross-correlation time difference estimation performance.