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前言锁相技术已经广泛应用个近代无线电工程系统中。就远程雷达测距机而言,为在甚弱信噪比条件下高精度也跟踪动态目标,窄带锁相环更将发挥着独特的功能。无论三阶环,变带宽二阶环,或者具有多普勒补偿的窄带在二阶环。通过合理的精心设计,都能
Foreword Phase locking technology has been widely used in modern radio engineering systems. In the case of long-range radar range finders, narrow-band PLLs will also play a unique role in tracking dynamic targets with high accuracy and under very weak signal-to-noise conditions. No matter the third order loop, the variable bandwidth second order loop, or the narrowband with Doppler compensation in the second order loop. Through reasonable design, can