改进的数字化TDRSS中频信号捕获跟踪系统  

Improved TDRSS IF signal acquisition and tracking digital system

作　　者：王诺[1] 戴逸民[1] 

机构地区：[1]中国科学技术大学电子工程与信息科学系,安徽合肥230026

出　　处：《通信学报》2003年第6期90-98,共9页Journal on Communications

摘　　要：跟踪与数据中继卫星系统(TDRSS)是转发地球站对低、中轨道航天器的跟踪测控信号和中继从航天器发回地面的信息的通信卫星系统,美国和俄罗斯的跟踪与数据中继卫星早已组网并投入运行,为适应我国现代航天测控技术的需要,我们对其中频信号扩频码及载波的捕获跟踪数字系统做了完整设计和实现。本文对其中关键技术及算法的改进设计,如扩频码的频域/时域二维序贯搜索捕获环与窄间隔超前、滞后数字锁相跟踪环,及载波自动频率捕获环、锁相跟踪环等的实现做了介绍。最后给出了基于FPGA实现的完整方案及性能。-The tracking and data relay satellite system (TDRSS) is a communication signal relay system which provides tracking and data acquisition services between low earth-orbiting spacecraft and ground control or data processing facilities, which has been launched and in use for many years in America and Russia. To suit for the development of modern TT&C technology in China, we redesigned a whole digital implementation of TDRSS IF carrier and PN code acquisition and tracking system. This paper introduces the key technologies and method in implementation of it, such as frequency/time two dimensional sequential acquisition loop and narrow-band early/lag DPLL of PN code; automatic frequency and phase tracking loop of carrier. Finally we give the performance of it抯 fully implementation on FPGA.

关 键 词：跟踪与数据中继卫星系统 中频接收系统 非平衡QPSK 序贯检测 自动频率控制 

分 类 号：V443.1[航空宇航科学与技术—飞行器设计]