摘要
针对空间站上行复合调相信号解调时存在输出噪声过大,以及测距信道和话音信道之间互相干扰的问题,提出一种改进的锁相接收机。引入了自动静噪控制电路,利用中频信号和参考信号同相相乘后产生的锁定指示电压控制静噪开关。无上行信号时,自动静噪控制电路可以关断解调输出,避免大量噪声进入测距信道、遥控信道和话音信道。基于巴特沃兹低通滤波器原型设计的测距信号滤波器,可有效抑制测距信道内的话音信号,使发射频谱中的残留话音信号抑制度达到47 dB以上。基于巴特沃兹带通滤波器原型设计的话音信号滤波器,可使话音信道内测距信号的抑制度达到62 dB以上,保证话音信号不受测距信号的干扰。该锁相接收机可适应空间站的统一S波段载波(USB)测控体制。
This paper presents an improved phase-locked receiver,aiming at the problems of excessive output noise and mutual interference between ranging channel and speech channel when demodulating the uplink complex PM signal of space station.Automatic noise suppression control circuit is introduced in the receiver,in which a noise suppression switch can be controlled by the lock indication voltage generated by same-phase multiplication of IF signal and reference signal.When there is no uplink signal,the automatic noise suppression control circuit can turn off demodulation output,to avoid a large amount of noise entering the ranging channel,the telecommand channel and the speech channel.The ranging signal filter based on Butterworth low-pass filter prototype can effectively suppress the speech signal in the ranging channel,thus reject the residual speech signal in the transmitted signal spectrum to larger than 47 dB.The speech signal filter based on Butterworth band-pass filter prototype can make the rejection of the ranging signal in the speech channel to larger than 62 dB,thus ensure that the speech signal is not interfered by the ranging signal.This phase-locked receiver can be adapted to the unified S-band(USB)TT&C system of space station.
作者
金骏
黄波
崔锐
孙晨
陈翔
JIN Jun;HUANG Bo;CUI Rui;SUN Chen;CHEN Xiang(Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China)
出处
《上海航天（中英文）》
CSCD
2022年第S02期154-160,共7页
Aerospace Shanghai（Chinese&English）
