Research And Implementation Of Beidou Receiver Lacation Algorithm Based On DSP

With the improvement of computer, communication and measure-control technologies, satellite navigation technology continues to advance, especially gets widely applied in military and civil fields, and has gradually becomes an essential measure of national military strength and scientific and technical level. China started to launch the Beidou Navigation Satellite System in the middle of 1990s. By Mar.30, 2016, China has successfully launched 22 satellites. Beidou is now able to provide service for the Asia-Pacific region, indicating the improvement of global navigation satellite system(Global Navigation Satellite System,GNSS).Global Navigation Satellite System receptor is an important part of navigation system. With the application of circuit chips such as Field Programmable Gate Array (FPGA) and digital signal processor(DSP), such performance as the instantaneity and precision of the receptor continues to improve. To meet the demand of instantaneity and large data storage, this thesis adopts the best combination method of FPGA+DSP and the latest and the most high-performance DSP chip as the processor. By the design and optimization of positioning solution algorithm, which makes a little contribution to China's beidou satellite positioning system.This thesis focuses on the study of the positioning solution of Beidou satellite receiver and implementation on DSP processor.This thesis firstly explains the basic positioning principle of Beidou-1 and Beidou-2, describes the mediation of navigation message and extraction of observations of Beidou satellites, and introduces the location and speed of Beidou satellites, the location of user receivers, and the calculation principle of speed. Then it describes the architecture of Beidou receiver, gives details of the software and hardware design for the DSP in the receiver, and establishes a model for positioning solution. On the basis of least square method, it mainly introduces the weighted least square and extended Kalman filter to establishes and modifies the model of pseudo-range observation error. In the end, it conducts an experimental verification for navigation solution algorithms, and adopts VC6.0 software in PC to show the host computer interface in real time, to ensure the high-precise and fast-speed positioning of Beidou satellite receiver both on the static and dynamic conditions.