Improved TDRSS IF signal acquisition and tracking digital system
Dai Yi-ming · Journal of China Institute of Communications · 2003
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 TTC 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.