Analysis Of Ranging And Positioning Performance For L1C And E1OS Signal

In order to provide users with better navigation and positioning services,GPS and Galileo designed and broadcast interoperable signals L1 C and E1 OS.Time-multiplexed binary offset carrier(TMBOC)and composite multiplexed binary offset carrier(CBOC)modulation are used respectively.However,whether the advantages brought by the theory can be reflected in the actual reception has yet to be verified.Therefore,this paper studies L1 C and E1 OS signal receiving algorithms,designs and implements L1 C + E1 OS signal software-defined receiver with better flexibility and portability.The measured GPS III,QZSS(Quasi-Zenith Satellite System)L1C signal and Galileo E1 OS signal were used to study the signal's ranging and positioning performance.The main work of this paper are:(1)The acquisition,tracking and positioning algorithms of L1 C + E1 OS signal software-defined receiver are studied.According to the different message structure of L1 C and E1 OS signal,algorithms such as frame synchronization,decoding,satellite orbit calculation and GPS III + QZSS + Galileo joint positioning were studied respectively.According to the above algorithm models,the L1 C + E1 OS signal software-defined receiver is designed and implemented.(2)The measured data are used to verify the functions of each part of the L1 C + E1 OS signal software-defined receiver.The accuracy of the L1 C + E1 OS signal software-defined receiver's acquisition,tracking and positioning are verified by the observations of the carrier frequency,code phase,time,ephemeris,etc.output by the software-defined receiver.(3)Based on the processing results of the L1 C + E1 OS signal software-defined receiver on the L1 C signal,the ranging and positioning error of the L1 C signal are analyzed.The constellation visibility of GPS III and QZSS in Xi'an and Sanya was studied,and a test plan was designed and the effect of joint positioning was analyzed.The results show that the ranging and positioning error of BOC(1,1)is proportional to the correlator spacing.The ranging and positioning error of TMBOC(6,1,4/33)will deteriorate at the platform of the correlation function.The front-end bandwidth has little effect on the ranging and positioning deviations of BOC(1,1)and TMBOC(6,1,4/33),and the enhancement effect of QZSS on GPS III is verified.(4)Based on the processing results of E1 OS signal by L1 C + E1 OS signal software-defined receiver,the ranging and positioning error of E1 OS signal and the joint positioning effect of L1 C and E1 OS signal are analyzed.The results show that the ranging and positioning error of CBOC(6,1,1/11,+)and CBOC(6,1,1/11,-)will deteriorate at the platform of the correlation function.CBOC(6,1,1/11,-)has less error in ranging and positioning at the other correlator spacing.The front-end bandwidth has little effect on the ranging and positioning error of CBOC(6,1,1/11,+)and CBOC(6,1,1/11,-),and the joint positioning optimizes the positioning accuracy factor,and the positioning accuracy is higher.