Data Research And Analysis On B1Signal Of BDS

BeiDou Navigation Satellite System (BDS) is a completely independent globalsatellite navigation system, now is the research hotspot of global satellite navigationsystem. BDS signals use new modulation, quadrature phase shift keying modulation（QPSK） to improve the data transfer rate, reduce the mutual interference betweenthe signal to improve the positioning performance, become one of the moderndevelopment in the direction of the global satellite positioning system. B1band ofBDS includes a civilian band, bring enormous social and economic benefits for themajority of the people, and therefore have a greater research value.In this paper, the B1band signal of BDS in-depth study, completed two platforms,in the software simulation and real satellite data processing signal generation,conversion, acquisition, tracking, and navigation message demodulation and otherrelated research.The main contents of this paper include: detailed basic principles for BDS, tograsp the BDS IF signal generation method and Simulink software platform togenerate a multi-satellite IF signal. Then the FFT acquisition of the signal generatedfor authentication, the results show that the generated signal having the realcharacteristics of the signal can be used for the latter part of the navigation messagesolver.And then I analyzed the the BDS IF signal acquisition, tracking, navigationmessage demodulation processing principle, based on QPSK modulationcharacteristics of the signal, I presents a method, a two-channel parallel acquisitionmethod, to improved signal tracking model, and make the acquisition more faster andbetter.In the end, Real BDS satellite IF signal processing by the data processing method calculated the coordinates of the location of the satellite in the coordinatesystem, verified the correctness of the principles and methods.