基于GPS／INS与天线阵列的导航系统抗干扰设计与分析

详细分析了GPS/INS紧耦合模型的结构和数学模型,给出了相应的EKF算法。分析了单级MVDR(Minimun Variance Distortionless Response)波束形成技术的缺陷,建立了多级MVDR波束形成技术的设计模型。在此基础上,给出了基于GPS/INS与天线阵列相结合的导航系统抗干扰设计模型。最后对该系统的输出载波噪声比和位置误差进行了仿真分析,结果表明,单级波束形成技术由于受到自由度的限制,在多干扰存在情况下产生较大的距离误差,而多级波束形成技术可以有效抑制多干扰信号存在的影响,保证导航系统的可靠工作。

Anti-jamming Design and Analysis of Navigation System Based on GPS/INS and Antenna Array

The structure and mathematical model of tightly coupled GPS/INS integration is detailedly analyzed,whose Extended Kalman Filter(EKF) algorithm is given.And then,the shortcoming of single Minimum Variance Distortionless Response(MVDR) beamforming is analyzed and the design model of multiple MVDR beamforming is set up.On this base,the anti-jamming model of navigation system combing GPS/INS and antenna array is proposed.Finally,the output Carrier to Noise Ratio and position error is simulated and analyzed.The results demonstrate that the position error of single beamforming technique due to the limited degree of freedom with the large of interference signals is greater than that of multiple beamforming technique,and that multiple MVDR beamforming can effectively mitigate a number of interference signals and ensure the reliability of navigation system.