Design And Implementation Of High Dynamic Digital Intermediate Frequency Source For Satellite Navigation

Along with social and economic progress and development of our country,the satellite navigation devices is arised in all aspects of people's daily life.People propose higher requirements in technical for the function and performance of equipment under high dynamic environment.But because of the satellite navigation equipment in high dynamic environment is inconvenient of mobility,so the high dynamic intermediate frequency source is a big demand for in the process of research.And the research of high dynamic intermediate frequency source is imperative.The high dynamic digital intermediate frequency source of satellite navigation can simulate the satellite signal generated in the high dynamic environment and provide the intermediate frequency signal to the receiver in real time,which can provide the basic signal for testing the high dynamic circuit board,verifying the different operation performance of the high dynamic receiver and improving the anti-jamming performance of the satellite navigation signal.By designing different high dynamic motion models,digital intermediate frequency sources with different high dynamic characteristics can be generated.The design and implementation of high dynamic digital intermediate frequency source for satellite navigation is of great significance to the development of high dynamic receiver.Based on satellite navigation high dynamic digital intermediate frequency source as the theme,the design and implementation of a brief introduction to the B1 I signal and its composition,satellite navigation was deduced dynamic mathematical model of intermediate frequency source with high speed and doppler frequency shift are analyzed,the relationship between high dynamic intermediate frequency source index is given,and the study of more than a single array and array yuan high dynamic mathematical model of intermediate frequency source.The motion scene conforming to the high dynamic target is designed,and the simulation model of the high dynamic intermediate frequency source is established to verify the generated intermediate frequency source and the real capture and tracking signal.The navigation message,dynamic pseudo-code,dynamic carrier and Gaussian white noise of B1I signal are designed by algorithm generation.On this basis,the generation algorithm of high dynamic intermediate frequency source for satellite navigation in multi-array environment is further studied,the array delay calculation methods for several different array models are derived,and the multi-array high dynamic intermediate frequency source is verified by DOA estimation.The algorithm is implemented and tested on ZYNQ software and hardware development platform,and the results show that the algorithm is correct and feasible.In the whole implementation scheme of high dynamic digital intermediate frequency source,a method of deriving phase difference based on displacement difference is proposed,which can accurately obtain the carrier Doppler frequency shift control word and pseudo code Doppler frequency shift control word,and then generate the high dynamic if source.The mathematical model of multi-array high-dynamic intermediate frequency source is established,and the azimuth information of spatial received signal is converted into signal phase delay,and the high-dynamic analog intermediate frequency source based on multi-array is generated,which lays a foundation for anti-jamming navigation signal.ZYNQ is adopted as the development platform of hardware realization,which improves the problems of low data transmission rate and complex hardware design caused by the previous combination of DSP and FPGA.