一、引言载波锁相环是VTR最重要的组成部份。这种环路如果跟踪得不准确,就会丢掉上行数据的载波。此外,VTR的载波环路有好几种工作方式,可做出新奇的环路结构。因此,美国防空司令部(ADCOM)对这种环路的性能进行了大量的分析,并正作进一步的研究。 First, the introduction Carrier phase-locked loop is the most important part of the VTR. If this loop is inaccurately tracked, it will lose the uplink data carrier. In addition, the VTR’s carrier loop has several ways of working to make a novel loop structure. As a result, the United States Air Defense Command (ADCOM) conducted extensive analysis of the performance of this loop and is conducting further research.