BPSK-PM深空通信信号载波捕获方案  

The Carrier Acquisition Scheme of BPSK-PM Signal

作　　者：王晓东[1] 甘淼[1] 王小锭[1] 蒋伟[1] 罗武[1] 

机构地区：[1]北京大学信息科学技术学院,北京100871

出　　处：《空军工程大学学报（自然科学版）》2011年第1期64-67,共4页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国防预研基金资助项目(9140A22031010XXXX)

摘　　要：BPSK-PM是一种以BPSK为副载波调制方式,而主载波使用PM调制方式的调制体制。这种体制使调制后的遥测遥控数据频谱与载波频谱分离,残留载波可用于测角测速和跟踪,因而常用于深空通信。首先介绍BPSK-PM调制体制,分析了其调制信号的频谱特性,然后根据应用场景要求提出了中频数字接收和载波捕获方案,其中载波捕获方案分为基于FFT的频率搜索和基于全数字锁频环技术的频率跟踪2个部分,并对这2部分做了详细的分析。最后给出了该载波捕获方案的实际应用案例,该载波捕获方案的有效性已在实际应用中得到初步验证。BPSK-PM is a modulation mechanism in which BPSK is used as its sub-carrier modulation mode and PM as its main-carrier modulation mode.This mechanism makes the spectrum of the modulated telemetry signal separate from that of carrier signal,while the residual carrier can be applied in A/V measuring and tracking.This paper firstly introduces the BPSK-PM modulation mechanism and analyzes the spectrum characteristics of its modulation signal,and then proposes a mid-frequency digital reception and carrier acquisition scheme according to the specific application.The carrier acquisition scheme is divided into a frequency searching part based on FFT and a frequency tracking part based on digital frequency-lock loop technology,which are analyzed in details.Finally,this paper shows a practical application of the carrier acquisition scheme,and the effectiveness of the scheme has been preliminarily verified in the Martian deep-space exploration of China.

关 键 词：载波捕获 BPSK-PM 频率搜索 频率跟踪 

分 类 号：TN927.2[电子电信—通信与信息系统]