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一、前言数字锁相环路是一种性能优良的环路。它具有模拟环路难以比拟的稳定性、可靠性、灵活性,调试简单,以及便于数字控制等优点。因此得到了越来越广泛的应用。在我所研制的y7-1编码遥测系统中,PSK解调器应用全数字化的二阶Costas(同相——正交)相锁环路和全数字化的一阶数据转换跟踪环路,码同步器应用全数字化二阶数据转换跟踪环路,均得到了较满意的性能。数字式锁相环路一般由数字式鉴相器,数字式环路滤波器和压控振荡器VCO组成,如图1。但是,通常环路VCO仍然采用高稳
I. Introduction Digital phase-locked loop is a kind of excellent performance loop. It has analog loop unmatched stability, reliability, flexibility, easy debugging, as well as the advantages of digital control. It has been more and more widely used. In our developed y7-1 coded telemetry system, the PSK demodulator employs a fully digital second-order Costas (Inphase-Quadrature) phase locked loop and a fully digitized first-order data conversion tracking loop. The code synchronizer Application of fully digital second-order data conversion tracking loop, have been more satisfactory performance. Digital phase-locked loop is generally digital phase detector, digital loop filter and VCO composed of voltage-controlled oscillator, shown in Figure 1. However, the loop VCO is still generally stable