考虑天线罩误差的雷达导引头隔离度影响与UKF在线补偿

针对雷达导引头隔离度对导弹制导控制系统带来的严重影响，建立了包含天线罩误差在内的雷达导引头隔离度模型，对比分析了弹簧力矩、阻尼力矩及天线罩误差引起的隔离度寄生回路稳定性和时域频域性能，并研究了不同干扰输入条件下导弹脱靶量与隔离度幅值的对应关系，重点提出了一种基于无迹卡尔曼滤波（UKF）的隔离度在线补偿方法，并进行了仿真验证.研究结果表明，导引头隔离度的存在会削弱制导控制系统稳定性、降低制导精度，其中负的天线罩误差斜率影响最为严重；闪烁噪声输入下，负的天线罩误差斜率和弹簧力矩隔离度引起的脱靶量较大，而在目标随机机动输入下，正、负天线罩误差斜率隔离度引起脱靶量较大；所提出的UKF隔离度在线补偿方法分别在速度指向误差和目标常值机动输入下均能够同时估计出弹簧力矩系数、阻尼力矩系数和天线罩误差斜率，并实现了对隔离度的有效抑制，达到了改善制导性能，提高制导精度的目的. 

Influence of Radar Seeker Disturbance Rejection Rate with Radome Error and On-Line Compensation with UKF

For the heavy impacts of radar seeker disturbance rejection rate on missile guidance and control system, a disturbance rejection rate model of radar seeker was established considering radome error. The stability and time-frequency domain performance of parasitic loop caused by spring torque, damping torque and radome error were comparatively analyzed based on the model. Analyzing the relationship between miss distance and disturbance rejection rate under different interferences, an on-line compensation method was proposed with unscented Kalman filter (UKF), and was validated with simulation. The research results show that, the disturbance rejection rate of radar seeker can weaken the stability and guidance accuracy of the guidance system, and the infection of negative radome error slope is the most serious. With glint noise, miss distance caused by negative radome error slope and spring torque is larger, while with random target maneuver, the miss distance caused by positive and negative radome error slope is larger. The UKF on-line compensation method can estimate the coefficient of spring torque and damping torque and the radome error slope with velocity pointing error and constant target maneuver. The disturbance rejection rate can be controlled effectively, the stability and performance of guidance system are improved with the compensation.