三阶锁相环接收机在深空通信系统中还未获得广泛的应用,因为目前采用的二阶环路已足以完成以往的宇宙飞行器的飞行任务了。对于今后的飞行任务来说,通过对多普勒特性的调查表明,单用二阶环路在一定的误差范围内可能无法完成任务。本文讨论一种简单的三价环路,它是现有的二阶环路的引伸这种环路不仅能扩展多普勒跟踪能力,并能扩展捕捉范围,也能减少捕捉时间。 Third-order phase-locked loop receivers have not been widely used in deep space communication systems because the second-order loop currently used is sufficient to accomplish the mission of previous spacecraft. For future missions, a survey of Doppler properties shows that a single second-order loop may not be able to accomplish its task within a certain margin of error. This article discusses a simple trivalent loop that is an extension of the existing second-order loop. This loop not only extends Doppler tracking capabilities but also extends the capture range and reduces the capture time.