GPS/INS超紧致耦合压制干扰能力分析

Capability Analysis of Blanket Jamming to GPS / INS Ultra-tight Coupling

采用带限高斯噪声和同速率伪码相关信号对全球定位系统(GPS)/惯导系统(INS)超紧致耦合导航系统GPS军码接收机实施压制干扰。通过分析GPS P(Y)码和M码信号功率谱变化特点,对以上两种压制干扰进行信号参数的优化确定,进而计算出参数优化后的干扰信号造成GPS/INS超紧致耦合GPS军码接收机载波环路失锁时射频前端处所需的最小干扰功率。考虑干扰信号入射角与接收天线增益的关系,仿真得到不同高度干扰源发射功率与有效干扰距离的关系曲线。根据要地目标的防护需求,对不同制导武器所需的连续压制干扰作用距离进行定量分析,并在此基础上对沿来袭制导武器航路附近部署的多干扰源位置坐标和数量设置问题完成建模求解。

Band-limited Gaussian noise and pseudo code with the same rate signal are adopted to actualize blanket jamming to GPS military receiver of GPS/INS ultra-tight coupling navigation system. According to GPS P（ Y） code and M code signal power spectrum change characteristic, above-mentioned two jamming signal parameters are optimized, the minimum jamming power causing GPS military receiver phase-locked loop（ PLL） lock-lose is calculated on the receiver RF front-end. Then,in consideration of the relationship between jamming signal orientation and GPS receiver antenna gain, the curve between effective jamming range and transmitting power of jammer is obtained under different liftoff height. According to protective re-quirement of key targets, requisite uninterrupted blanket jamming effect distance to different type guided weapon is analyzed quantitatively,and location and number setting problem of multiple jammers deployed on the following path two-side are modeled and solved.