GPS Simulation Method Based on SDR Analog Signal Deception

This paper proposes a dynamic GPS deception signal generation method based on Software Defined Radio (SDR) to address the security issue of civilian GPS receiving devices being susceptible to deception and interference. By analyzing NASA ephemeris data in real-time and combining Kepler’s law with Newton’s gravity model to accurately calculate satellite spatiotemporal parameters; Innovatively adopting carrier phase pseudorange joint optimization algorithm and ionospheric/tropospheric delay dynamic compensation technology, significantly reducing multipath effects and wall reflection interference; In the actual testing scenario in the Dishui Lake area of Shanghai, the spectral correlation of deception signals increased by 40%, the success rate of deception by receiving devices exceeded 90% (traditional methods were only $60 \%-70 \%$), and the probability of signal interruption decreased by $\mathbf{3 0 \%}$.