Partial Algorithm And Position Error Research Of Beidou Receiver

Basing on the Double Star Active Positioning System, this article conducted the research on the Beidou Tri-star Passive Positioning System. The Double Star Active Positioning System is the first independent satellite navigational system of China. It has the function of telecommunication which doesn't exist in GPS, but it also has the the shortcoming that user is few and easy to expose simultaneously. Beidou Tri-star Passive Positioning System is enormous supplement of the Double Star Active Positioning System and has the enormous military value. This article conduct the whole design on the Tri-star Passive Receiver.Firstly, this article elaborate the development of the world satellite navigation and present situation of satellite navigation in China. , at the same time point out the shortcoming and the insufficiency of the Double Star Active Positioning System. After that,the article introduces the signal system as well as modulation and demodulation of Beidou satellite, next, explain the telegram form elaborately. These work build the foundation for design of the whole receiver.Secondly, the article research the whole receiver. At first, design the hardware platform, next explain the principle work of the receiver, Then research Witerbi decode which belong to part of the rear process .At last listed the algorithm as well as the software flow.Finally, the article carry on the analysis to the error of the receiver from each aspect, and limit the entire erroneous scope of receiver.