Research On The Testing Scenes Design Technologies Of GNSS Anti-Jamming Antenna Arrays

As we all know, adaptive beam forming by using antenna array is an effective wayto improve the anti-jamming ability of receivers in Global Navigation Satellite System(GNSS), the performance estimation and measurement technology of antenna arrayreceivers has been a bottleneck to improve its anti-jamming performance. At thisbackground, this thesis studied on how to design the testing scenes efficiently whenmeasuring the anti-jamming performance of an antenna array receiver, which will dohelp to improving the efficiency of algorithm research and performance evaluating ofantenna array receivers.Firstly, the basic principles of antenna array anti-jamming for GNSS, the indexesused to estimating the anti-jamming performance, the array output Signal to NoiseRation (SNR) and antenna array pattern were analyzed. Then, we summarized thepresent methods of anti-jamming performance measurement and scene designing forantenna array receivers, which made theoretical preparation for the following research.Focusing on the shortage of tradition scene designing in test, based on theoryanalysis, we concluded that anti-jamming performance of antenna array iscorrespondent to the angle between signal subspace and jammer subspace rather thanangle between signals and jammers. The further simulation result demonstrated that, theusually ideal which thinks that the bigger the signal and jamming angle, the better theanti-jamming performance did not hold always, there exists situations where the signaland jamming angle is big, while the anti-jamming ability is weak, and we demonstratedthe conclusion by theory analysis results.The Singularity phenomenon makes it difficult and complex to set scene inestimating the anti-jamming performance of antenna array. Traditional method whichrestricts the signal and jamming angle has obvious shortage, so this thesis studied on thesome test scenarios, which have typical representative. A method on how to set thesignal and jamming position to obtain the optimal performance was given, and weobtained a series classic scene. The worst scene designing will be studied in our nextwork. The simulation results demonstrated that, the array gain could reach6dB (thetheory optimal value) by our scene designing method for a4-elements antenna array.Finally, outfield testing method for real signal environments was studied based onthe Compass II system. Static test method on top floor of buildings was designed.Testing results demonstrated that Carrier to noise ratio (CNR) is not correspondent tosignal and jamming angle, which verified our theoretical analysis and simulation results.