Study On Implementation And Experiment Of Anti-jamming Technology In Space-domain For Satellite Navigation Systems

Global Positioning System (GPS) and BD navigation system use directsatellite navigation signal for navigation and location, but in actual signalpropagation environment, may exist all kinds of interferences, this will seriouslyaffect the normal work of the receiver. So anti-interference technology isimportant to realize the satellite navigation functions. For anti-jammingtechniques, adaptive anti-jamming algorithm in space-domain is the keytechnique.Navigation system receiver mainly includes acquisition tracking, decodingand location. For signal strength is very weak, when the interference exist,acquisition will not success. Although the space anti-jamming algorithm caneffectively restrain the interference signals, so the affect of the anti-interferencealgorithm to acquisition is also an important question. Based the research of theacquisition and the anti-interference principle, through the GPS system in thedifferent simulations under the interference environment, and the result ofacquisition and loss of signal to noise ratio,the performance and effect of thespace anti-jamming algorithm to acquisition is analyzed.Based on the some project, the dissertation realized the hardware system ofthe navigation anti-jamming in space-domain and acquisition . All program codedesign in the FPGA chip is completed, including FPGA and DSP communication,digital beamforming to achieve and acquisition the associated channelcoding,and also the commissioning and performance are analyzed.