多频测距解模糊的实现方式通常有两种:二次差频和参差双频.二次差频测距具有原理简单、接收机和发射机设计相对容易等优点.本文对二次差频测距的基本原理进行了详细推导,并对正确解模糊对信噪比的要求给出了理论分析,最后通过仿真实验验证了该方法的有效性,为多频连续波测距雷达的设计提供了一定的理论依据.

The realization mode of solving ambiguity for multiple frequency ranging usually has two kinds:quadric difference frequency and uneven dual frequency.The former has the advantages such as simple principle and easy design of receiver and transmitter.This paper deduces the principle of ranging based on quadric difference frequency in details and analyzes the need for SNR when solving ambiguity correctly.Finally simulation results verify the validity of the method.It provides the theory basis for design of multiple frequency CW ranging radar.