Effectiveness Analysis of the Blanket Jamming Mode to GPS M Code Signal
Aiming at the feature and superiority on anti jamming of global position system(GPS) M code signal, in order to find an effective jamming mode for M code signal, the jamming efficiency of three types of typical blanket jamming, single frequency, band limited Gaussian noise, and pseudo code with the same rate, are analyzed. In the analysis, the power spectral density change of GPS receiver cross correlation filtering output is taken as the qualitative evaluation bases; the code tracking error and the ephemeris bit error rate(BER) are taken as the quantitative evaluation indexes. The influence process of jamming to evaluation factor and the oneness of each evaluation factor are derived theoretically by modeling M code signal receiving system. The simulation results show that single frequency jamming exhibits the best jamming effect while band limited Gaussian noise jamming is the worst, the second comes pseudo code with the same rate jamming when the influence of sub carrier modulation was eliminated. Considering the complexity of smart jamming implementation, it is suggested to choose the pseudo code with the same rate as M code signal jamming since single frequency jamming needs strict frequency setting and it is easily eliminated by frequency domain filtering.