Research On Technologies Of Reconfigurable Multi-Mode Satellite Positioning Signal Processing

Satellite navigation and positioning technologies have found broad applications in both military and civil domain, and brought invaluable military, economic and social merit. Under the circumstance of the existence of multiple satellite positioning systems (SPS), it is valuable to research on multi-system compatible, high sensitivity and high precision satellite positioning signal processing technologies.The state of arts of satellite positioning signal processing technologies is studied in this thesis. Orienting the development direction of satellite positioning signal processing technologies and based on the existing digital and software methods, the multi-system adaptive satellite positioning signal processing technology founded on reconfigurable digital logic or reconfigurable software algorithm, and the multi-mode satellite positioning signal processing technology integrating the existing digital autonomous mode, software assisted mode, and self-assisted mode, are deeply studied. The following contributions are made to the satellite positioning signal processing technologies in this thesis:(1) A multi-system compatible and reconfigurable digital satellite positioning signal processing technique is proposed. In order to improve the flexibility and compatibility of the digital satellite positioning signal processing technologies, a multi-system compatible reconfigurable digital satellite positioning signal processing channel, that mainly consists of a reconfigurable carrier numerically controlled oscillator, a reconfigurable spread code driver clock generator and a reconfigurable spread code generator, was designed. This satellite positioning signal processing channel has reconfigurable carrier frequency, spread code rate and spread code sequence, thus has the ability to acquire, track and demodulate multi-system satellite positioning signals, and is actually the base of research and development of multi-system compatible digital satellite positioning receivers.(2) Two algorithms for fast and high precision measurement of spread code phase of satellite positioning signals are proposed. The first one combines FFT and direct correlation, and consumes 51%, 29%, 18% and 13% computational expenditure of the existing algorithms in the case of the spread code phase measurement resolution being 1/4, 1/8, 1/16 and 1/32 of spread code chip width, respectively. The second algorithm decreases the error of spread code phase measurement to 32-48% of the existing algorithms and improves the precision of measurement without increasing the computational expenditure. The performance of the two proposed algorithms is experimentally proven to be better than the existing algorithms, and...