Design And Implementation Of Acquisition Algorithm For BeiDou Satellite Navigation B1C Signal

BeiDou Navigation Satellite System(BDS)has evolved into a global networking phase.In order to improve the navigation and positioning performance,BeiDou Navigation Satellite System has added the B1C signal as a global public service signal.With the acceleration of global networking speed,BeiDou B1C signal will become an important broadcast signal in BeiDou navigation satellite system.The acquisition of B1C signal is the key to signal synchronization in satellite navigation receivers,and its acquisition algorithm directly affects the navigation performance of the receiver.Therefore,the design and implementation of acquisition algorithm for BeiDou satellite navigation B1C signal has important practical value.Based on the review of the research status of navigation signal acquisition algorithms at home and abroad,the acquisition algorithm of BeiDou B1C signal is designed and implemented for the signal characteristics of BeiDou B1C signal.The main works are as follows:1.The basic theory of navigation signal acquisition is expounded,and performance indexes of acquisition algorithm for navigation signal are analyzed.Acquisition algorithms for the GNSS(Global Navigation Satellite System)signal are studied.The acquisition algorithm for traditional BPSK modulation signal and the modern BOC modulation signal are given,and the performance of each acquisition algorithm is analyzed.2.The signal characteristics of BeiDou B1C signal are studied.According to the characteristics of BeiDou B1C signal,a BeiDou B1C signal acquisition algorithm based on PCF(pseudo correlation function)is proposed.The pseudo correlation function of QMBOC(Quadrature Multiplexed Binary Offset Carrier)signal is designed,and the joint acquisition strategy of data component and pilot component is adopted,and an adaptive threshold decision method is given in the algorithm.The autocorrelation peak of B1C signal is eliminated effectively by proposed algorithm.The unambiguous acquisition of B1C signal is implemented,and the acquisition sensitivity is improved.3.Aiming at the large bandwidth of BeiDou B1C signal,a satellite navigation receiver based on ZYNQ architecture is designed.The acquisition algorithm for BeiDou B1C signal is modularized,and the implementation flow of each functional module is given.Using VHDL language and C language,the circuit design and software development of each functional module are carried out on the ZYNQ platform,and the functions of each module of the acquisition algorithm proposed in this paper are verified.4.The acquisition algorithm for BeiDou B1C signal is tested on the satellite navigation receiver.The performance of the navigation IF signal bandwidth,B1C signal acquisition,acquisition time and power consumption of the acquisition algorithm are tested.The test results show that the proposed acquisition algorithm can acquire the,BeiDou B1C signal accurately.