全捷联被动雷达末制导系统设计

为解决全捷联被动雷达导引头大测量误差下的精确制导问题,从实际工程应用角度出发,对全捷联被动雷达末制导系统进行了研究。首先,建立了全捷联被动雷达导引头模型。其次,针对系统非线性、滤波稳定性、计算量及制导与姿态控制的耦合问题,提出了基于容积卡尔曼滤波(cubature Kalman filter, CKF)的制导信息提取、滑模变结构制导、三回路过载驾驶仪等算法相结合的末制导系统方案。最后,结合反辐射导弹应用场景,建立全系统仿真模型进行方案验证。结果表明,所设计的末制导系统对静止目标的打击精度为2 m,对于15 m/s以内的慢速移动目标,也具有较好的适应能力,落点圆概率误差(circular error probability, CEP)可以达到10 m左右。

Optimized computation of electromagnetic sacattering based on integral equation

To improve numerical computation of electromagnetic scattering, a fast approach to integral equation is developed. The algorithm is based on the adaptive integral method (AIM). This method maps the triangular basis functions onto a rectangular grid with auxiliary basis function. And then the computation of the matrix-vector products in the iterative solver is accelerated by the fast Fourier transforms (FFT). The new fea-ture of the algorithm is the application of the single integral equation (SIE) to analyze the electromagnetic scat-tering from three dimensional objects. Compared with the conventional coupled integral equations (CIE) method, the SIE method reduces the number of unknowns. The new formulation converges significantly faster than the traditional CIE formulation. The numerical results are presented to show the efficiency and accuracy of the proposed method.