The Design And Implementation Of Multi-mode Satellite Navigation Receiver

Satellite navigation receiver is applied widely in the military and civilian field of military equipment,aviation and aerospace,and is much important navigated equipment in aerocraft.It can fix the position of aerocraft accurately under all kinds of complex terrain condition,and ensure aerocraft performing the task.It is extremely important for ensuring the safe operation of aerocraft,and can guide it to land safely by operating with other equipment in the aerocraft during the flying.Therefore,the safely completion of task depends on the performance of satellite navigation receiver directly.The navigation requirement can not be meted by the single system,GPS,GLONASS and BDS in complex condition which is full of occluding objects,such as forest,bridge and building,etc.And the multi-mode satellite navigation receiver,for instance GPS+GLONASS or GPS+BDS+GLONASS,performs better than single mode's in availability,continuity and integrity.It can meet high-dynamic and high-precision navigating requirement.This paper elaborates the design and implementation of multi-mode satellite navigation receiver,the multi-mode satellite navigation receiver can receive GPS / GLONASS / BD2 signals,extracts the ephemeris information and Doppler frequency shift information broadcasted by satellite through the base-band signal processing,solves the navigation information required by carrier real-time through the navigation processing module,and provide the navigation information and other additional information(time information,status information)to the navigation computer through the external interface.This receiver board has the advantages of small size,high dynamic range performance.Firstly,this paper expounds the basic navigating theory of triple-mode satellite navigation receiver.Then,gives its whole development solution and the realization details,including hardware and software part.Hardware part related,finished the design and realization of receiver's power supply unit,clock unit,RF unit,AD unit,DSP and FPGA unit.Software part related,finished the programming of FPGA chip EP4CE115 and chip TMS320C6747 based on DSP.Finally,the debugging and test result of soft and hard-ware illustrate that triple-mode satellite navigation receiver system can meet the specification of applicable performance requirement.