Research On Anti-jamming Technologies For The GPS Receiver

Global positioning system(GPS) is a high-precision navigation and Positioninging system which provides users with longitude, latitude, altitude, velocity and time information.It has been widely applied in military and civil fields. But the GPS receiver receives satellite navigation signal is very weak, susceptible to a variety of jammers. Minor jammer signal could cause instability or even complete failure of the GPS receiver. Therefore, the problem is more and more people’s attention. In order to allow navigation receiver can work properly in a variety of noisy environments, it is necessary for the receiver jamming key technologies for effective research.This paper mainly for satellite navigation receiver anti-jamming capability studies, first discussed the principles of GPS signal generation, and the receiver can be subject to jammer intentionally or unintentionally, analyzing, mainly for intentional jammer narrowband and broadband jammer introduced in detail.Based on the analysis for the narrowband jammer immunity performance based on direct-type IIR notch filter on the narrowband tone jammer inhibition effective for certain bandwidth narrowband jammer has proposed direct type IIR notch filter algorithm improvements, direct-type IIR notch filter cascade, as well as anti-jamming performance and effectiveness of the algorithm is validated by simulation.Adaptive Algorithm for interference to suppress jammer when wideband jammer,wideband jammer and narrowband jammer exist for paper, empty, detailed derivation algorithm adaptive immunity unconstrained space, adaptive anti-air uniform circular array-based jammer algorithm focused analysis in MATLAB and broadband jammer narrowband jammer exist, the algorithm is still able to effectively determine the jammer wave direction, to produce a deep neutral. Compared with LCMV algorithm can better improve the output of the system SJR. Verify the validity of the algorithm through simulation.With the development of space technology in recent years, the GPS system, the GLONASS system and under construction in China "Beidou" navigation satellite system, are based on satellite navigation and positioning system principle, therefore, a strong one another comparability and mutual reference. Therefore, in the relatively mature, and Interference withinterference problems the GPS system used on the basis of universal, then transition to the "Compass" system is feasible and necessary.