高精度锯齿波调频主动雷达中频模拟器设计

Design of the High Precision of Intermediate Frequency Simulator for Sawtooth FM Active Radar Seeker

在介绍锯齿波调频主动雷达测距原理基础上,分析锯齿波调频主动雷达中频模拟器需具备的功能;着重阐述距离频差模拟方法以及弹目相对速度造成的距离频差细微变化的模拟方法;多普勒频率模拟以及由于发射信号波长变化带来多普勒频率变化的模拟方法;基于D触发器的回波延时产生方法。并利用FPGA和DDS设计实现了高精度锯齿波调频主动雷达中频信号模拟器,该模拟器通过上位机控制软件进行参数设置,可灵活地模拟不同情况下的目标,已经应用于锯齿波主动雷达导引头的调试和测试中。

According to the introduction of the principle of the measuring distance with sawtooth FM.Analyses the function of the intermediate frequency simulator of active radar which must have.Describes in details the method of the simulation of rang-frequency and the method of the compensating error because of the velocity between seeker and targets;the method of the simulation of Doppler frequency and the method of the compensating error because of the vary of the signal carrier＇s wavelength;the method of the time delay based on D register and the distance warp because of high velocity.The IF simulator used FPGA and DDS,and it can simulate flexibly the different targets controlled by computer;it is also successfully used in the debug of the sawtooth FM active radar seeker.