Research And Design Of BD Receiver Baseband Processing

The GNSS satellite navigation is not only related to national defense and security technical support system, but also to serve the public, building a harmonious society, an important tool to improve the quality of life. The “Bei Dou” Navigation Satellite System and positioning technology is rapidly developing. The construction of Bei Dou with global navigation and positioning capabilities, has a profound impact on China’s economic construction and national defense construction.The two generation Bei Dou Navigation Satellite System(BD-2) is a new generation of satellite navigation system which is developed by China stand on its’ own. The baseband signal processing module is the core module of the Bei Dou user machine.Firstly, this paper analyzed the development situation of global satellite positioning system, described BD-2 positioning system and their signal form in detail; Then According to the doppler effect on the signal reception and the common methods of signal acquisition, improve the original receiver acquisition algorithm.Navigation receiver tracking loop includes a carrier tracking loop and the code tracking loop, In this paper analyzed the operating principle of tracking calculation method. In this paper, its analysis and research, including the carrier loop integrator, carrier loop discriminator, loop filter, and the study of codes and narrow ring of measurement error related technologies. According to the results of the Institute of the key parameters to design and improve the tracking loop.Then, the thesis introduces the BD-2 receiver hardware platform based on FPGA+DSP, Separately on the FPGA in the module design and DSP in the control algorithm of software process are introduced in detail. Test the receiver positioning performance in a static environment, the positioning results show that, the development of the subject of the static environment of Beidou receiver single point positioning error within 10 meters; At the end of the positioning error causes were analyzedFinally, the summary and Prospect of the whole paper. Looking forward to China’s Beidou navigation positioning field to achieve greater breakthroughs...