卫星导航欺骗式干扰源高精度直接定位方法

A direct position determination method called DS-DPD(DeSpreading Direct Position Determination) which is based on satellite navigation signal characteristics is proposed to improve the positioning accuracy of satellite navigation spoofing. The received signal model is first established, which takes the transmission delay, Doppler frequency shift and satellite code signal into account. The maximum likelihood(ML) criterion is then utilized to construct the objective function of DS-DPD, and the location parameters can be obtained through a two-dimensional spectral search of the objective function. The proposed method utilizes partial knowledge of the satellites'code sequences, which in turn provides significant gains in positioning accuracy. Numerical simulations verify the positioning performance improvement of the proposed DS-DPD algorithm. Especially, when the interference to noise ratio(INR) is −30 dB, the positioning accuracy could be improved by more than 10 times due to its full utilization of the delay, Doppler frequency shift and code sequences information.