GPS接收机在高动态下的抗干扰技术实现

针对GPS接收机的功率倒置算法(PI)在高动态环境下的加权系数更新速度滞后于干扰入射的变化速度问题,提出基于零陷加宽的PI功率倒置算法,通过零陷的加宽对来向干扰的接触面积更大,能抑制干扰的角度范围更大。同时为了满足硬件平台的可行性,改进了基于零陷加宽的PI功率倒置算法,对协方差矩阵引入了与零陷宽度相关的矩阵T,一次权值更新只需计算一次协方差矩阵。仿真结果表明在高动态环境下,抗干扰的零陷增益达到68 d B。在DSP+FPGA的硬件平台上,一次权值更新时间只需6.3 ms,满足高动态的干扰入射角度的变化速度。

Research on Interference Suppression of GPS Receiver in High-dynamic Environment

Aimed at the problem of interference suppression of GPS receiver in high dynamic environment,found interference suppression ability of the traditional power inversion algorithm has the flaw in high dynamic environment: the interference direction changes rapidly within a short time, the conventional interference suppression algorithm which uses receiving data covariance matrix failed. The algorithm is improved by widening the nulling, which makes the contact area with the interference larger, So that the interference Angle which can be restrained is wider and high dynamic interference suppression effect is enhanced. However, the widening of nulling leads to the lower of nulling gain. The simulation show that widening the nulling algorithm is suitable for interference suppression in static environment and high dynamic environment,the algorithm has the nulling gain of 68dB. On DSP + FPGA hardware platform, a weight update time is just 6.3ms, meet high dynamic rate of change of the angle of incidence of interference.