天线罩误差对制导回路稳定性影响分析

Analysis of radome error on guidance loop stability

针对雷达寻的导弹天线罩寄生回路影响制导控制系统稳定性的问题,建立考虑天线罩误差的三维非线性制导回路模型,提出一种基于状态方程形式的天线罩误差斜率对制导回路稳定性的影响分析方法。推导获得了天线罩误差斜率对制导回路系统矩阵影响的定量形式,并基于线性时不变系统的稳定性判据,计算给出天线罩误差斜率影响下的导弹制导回路稳定条件。计算分析和仿真结果表明:寄生回路正反馈时会引起导弹姿态的振荡发散问题,严重影响制导回路稳定性。

To address the problem that the parasitic loop of the radar homing missile radome affects the stability of the guidance and control system,a three-dimensional nonlinear guidance loop model considering the radome error is established,and an analysis method on the stability of the guidance loop was proposed based on the radome error slope in the form of state equation.The quantitative influence form of the radome error slope on the guidance loop system matrix is derived,and based on the stability criterion of the linear time-invariant system,the stability conditions of the missile guidance loop under the influence of the radome error slope are calculated.Calculation analysis and simulation results show that the positive feedback of the parasitic loop will cause the oscillating divergence of the missile attitude,which will seriously affect the stability of the guidance loop.