对GPS军码信号的高效带限高斯噪声干扰分析

Analysis of efficient band-limited Gaussian noise jamming for GPS military signal

为提升带限高斯噪声干扰效率,以接收机码跟踪误差和星历误码率作为干扰效果评估指标,结合全球定位系统P(Y)码和M码信号的功率谱特点,对其不同干信比以及副载波调制相位下的最佳干扰带宽分别进行了理论公式推导和定量仿真计算。对拟采取的分布式带限高斯噪声干扰源功率合成问题进行了分析,得出增加干扰源数量虽然能减小合成功率的相对损失量,但同时会提升合成功率出现小值风险概率的结论。因此,可按照实际所需的合成功率期望值设置最佳干扰带宽,选择数量适中、功率随机取值的分布式干扰源,进而达到提升干扰效率的目的。

For improving efficiency of band-limited Gaussian noise jamming,this paper uses code tracking error and ephemeris bit error rate of global positioning system(GPS)receiver as the jamming effect evaluation index.Combining GPS P(Y)code and M code signal power spectrum characteristics,the optimal jamming bandwidth is derived theoretically and calculated quantitatively under different jamming to signal ratio and sub-carrier modulation phase respectively.The power synthesis of distributed band-limited Gaussian noise jamming sources which are to be adopted is discussed.It is concluded that increasing the number of jamming sources can reduce the relative loss of synthetic power;however,it will improve the risk probability of appearing small values.Therefore,it should set optimal jamming bandwidth based on the actual power synthesis expectations,and select number appropriate and power random distributed band-limited Gaussian noise jamming sources to achieve the purpose of improving jamming efficiency.