LIU Wen-tao1, XIE Jin-shi2

(1. the 10rd Institute of China Electronics and Technology Group Corporation, Chengdu 610036, China;

2. the Unit 61081 of PLA, Beijing 100094, China) 

Abstract：The key techniques of the baseband signal processing for the MSAS(multi-functional satellite augmentation system) is introduced. For the IF data of MSAS, which were sampled and stored at the top of a building in Chengdu in 2006, the baseband signal processing is realized through software, and the algorithm principle of the key techniques is verified. Besides, it is proposed to add a MSAS processing channel to the GPS receiver so as to improve the positioning precision and strengthen the GPS integrity monitoring.

Key words：multi-functional satellite augmentation system; Viterbi decoding; CRC(cyclic redundancy check)