调频调相应答机距离零值测量新方法

叙述了分频调制度变换器的工作原理和时延测量。提出了根据测量FM信号源大频偏调制与小频偏调制的时延差来挑选出恒时延FM信号源，采用恒时延FM调制器构成FM—PM应答机（或FM—PM测距地面站）距离零值测量方法和设备，这是FM—PM体制侧音测距系统的一种距离零值测量新方法；提出了采用分频调制度变换器和非恒时延FM信号源构成FM—PM应答机（或FM-PM测距地面站）距离零值测量方法及设备。

A New Method for Measurement of the Zero Range of FM-PM Transponders

The paper discusses the principle of frequency divider modulation index converter and delay measurement. Constant delay FM modulators can be selected by measuring the delay difference between large and small modulation index FM modulators. Constant delay FM modulator is used to make up the zero-range measurement method and equipment for the FM-PM transponder （or FM-PM ranging earth station）. This is a new method for measurement of the zero range of FM-PM system side tone ranging system. The paper proposes a method and equipment using frequency divider modulation index converter and non-constant delay FM signal source to make up a zero-range measurement method and equipment for an FM-PM transponder （or FM-PM ranging earth station）.