Design And Performance Research Of Navigation Signal Enhancement Simulation Platform

Satellite navigation systems are playing an increasingly important role in both civilian and military applications,but the satellite navigation signal is easily disturbed by the outside world.In some special environments,such as mountains,jungles,indoor etc,the performance of the satellite navigation system is not ideal,or even it's function may not be realized at all.So research on navigation signal enhancement is imperative.In view of the existing satellite navigation system,the performance is not ideal in some special environment.On the basis of existing navigation signal system,two kinds of navigation signal enhancement platform is designed and simulated in software.The main works of this dissertation can be summarized as follows:(1)simple description of the existing satellite navigation augmentation system have been made,and the current development status of satellite navigation augmentation system have been thoroughly analyzed and introduced.The composition of all kinds of navigation signal system have been summarized,the signal system have been compared and analyzed.(2)Using the combination of CDMA and FDMA,the architecture of the simulation platform is constructed based on Simulink,the baseband analog simulation design of transmitter and receiver is completed on this platform,The functions of main models are described detailedly,And the realization method is given.The results verified the feasibility of the method,moreover the BPSK modulation makes carrier supperession with good concealment and strong anti-jamming ability.The method meets thelocation needs of the special environment and has a good application prospects.(3)Using the combination of OFDM and the direct sequence spread spectrum,the architecture of the simulation platform is constructed based on MATLAB programming language,the baseband analog simulation design of transmitter and receiver is completed on this platform,the structure of the original data is recovered completely through the spread spectrum and OFDM modulation and demodulation,The feasibility of the scheme is verified.(4)In two ways,the theory of navigation signal enhancement platform is verified.The performance of the two is compared,The difficulties that may exist in the practical engineering application are put forward,And the corresponding solutions are given.