Research On Modeling And Simulation Of The GPS And Its Performance Analysis For Anti-interference

With the GPS for navigation, positioning, precision strike weapons and otheraspects of the wide range of applications, GPS receiver anti-jamming performance isvery important. In this paper, a combination of theoretical analysis and simulation tostudy the GPS receiver and interference conditions, in particular their synchronizationand demodulation performance.This paper first describes the development status at home and abroad, give anaccount of the GPS satellite navigation system components, principles and structure,and transmission of Channel Doppler shift, and a common analysis and comparison ofthe interference pattern for the GPS receiver. Then, a GPS C/A code software receivermodel is established, including GPS satellite signal acquisition, tracking algorithm. Forthe initial phase of the signal demodulation performance is generally poor, and there isnoise in the stable phase, the carrier tracking loop filter is improved to improve thenavigation data demodulation performance.Third, from the positioning accuracy anderror rate analysis of both the anti-jamming GPS receiver performance analysis fornarrow-band interference and wide-band interference effects of capture and positioningaccuracy, the results show that adding the right channel signal to interference powerfrom to the interference of the receiver, the receiver can not correctly position, andfocused on analyzing the receiver channel with different styles in the suppression ofjamming, the demodulation error rate. Finally, the summary of the text, and the prospectof next step.