在深空遥测、跟踪和指向系统中,以及在需要消除或测量多普勒效应的卫星和空载设备中,接收机必须解调极其微弱的讯号,达种情况下以使用锁相接收机效果最好。锁相接收机可以线性解调淹没于噪声中20到 In deep space telemetry, tracking and pointing systems, and in satellites and no-load devices that need to eliminate or measure Doppler effects, the receiver must demodulate extremely weak signals, using the phase-locked receiver effect the best. The phase-locked receiver can be linearly demodulated submerged in noise for 20 to