噪扰下数字化多频连续波雷达的测距模糊问题

Ambiguity Problem of Digitized Multiple Frequency CW Ranging Radar Under Noisy Condition

数字化多频连续波测距雷达是一种新体制雷达 .它具有能同时测定多个目标、便于同时得到目标多个运动参数等突出优点 .为了解决增大最大测距不模糊距离与提高测距精度之间的矛盾 ,我们将会在多频雷达中采用参差频差关系进行测距 ,这样我们可以大大提高测距最大不模糊距离 .但此时噪声对测距结果有着各种有待讨论的影响 ,包括 :能否正确解模糊 ;对输入信号信噪比有何要求 ;理论测距精度有何变化 ;直至对参差系数有何要求等 .数字化多频雷达的这些问题 ,本文对这些问题进行了详细的讨论 ,并给出了本文结论的计算机仿真结果 .从而在理论上为这种雷达的深入研究提供了一个很好的基础 .

Digitized multiple frequency CW radar is a kind of new system radar. It can detect lots of targets and acquire different movement parameters as well. But it is hard to enlarge maximum unambiguous range while improving ranging accuracy at the same time. To deal with such a contradiction, stagger frequency differences are adopted, thus maximum unambiguous range can be enlarged greatly. The influences of the noise on the ranging results are presented. Correct solutions for ambiguous range, the limitation for input SNR, change in ranging accuracy and restriction to staggering parameters are discussed. Simulation results verify the conclusion, which could be a groundwork to future research.