Beidou Satellite Research, And The Combination Of The Pseudo-satellite Positioning System

Dual-Satellite Positioning System was designed and controlled by our country. The integrated positioning system based on Dual-Satellite and pesudolite technology to improve Dual-Satellite performance is researched. The mode of navigation processing unit in the receivers is passive, and the positioning precision was improved in this improved integrated positioning system. This research enlarged the applied field of pesudolite system and advanced the research in Dual-Satellite system.The new integrated system scheme is planed out. Positioning algorithms are constructed. Code-phase pseudorange algorithm and Carrier-phase differential navigation algorithm are analyzed in details and carried out in computer. The result of simulation demonstrates well.Some problems such as far-near field affection, synchronization between pseudolite and satellite etc. affect obviously. The dissertation tries to eliminate these affection in details: Far-near field problem can be relieved by changing the pesudolite's signal format and increasing the dynamic range of receivers; Dual-Satellite's dual directions timing technology and atomic tinier are contributions to enhance synchronization, The constraints of the layout and location of pesudolite stations, such as GDOP, proof-interfere etc., are also focused in. Pesudolite station hardware is designed and some advices are supplied to the improvement of receivers.The most import performance to evaluate a position and navigation system is precision. The position precision is also discussed approximately by the analyses of error and GDOP. Effective methods to reduce error and interference are suggested.