弹载双基前视 SAR 俯冲段弹道设计方法

摘要

导弹在打击复杂背景目标时，现有单基平台末制导手段难以实现对目标的有效分离。作为一种解决方案，将双基前视合成孔径雷达（synthetic aperture radar，SAR）应用于俯冲攻击段，即弹载双基前视 SAR（mis-sile-borne bistatic forward-looking SAR，MBFL-SAR），可实现弹载雷达末端俯冲段全程二维高分辨成像、自主寻的精确制导。而在该构型下作为发射机的照射弹轨迹直接制约双基成像分辨率以及制导精度。首先分析了 MBFL-SAR俯冲攻击段的分辨率特性，然后提出了基于线性衰减轨迹模型的弹道设计方法，该模型可有效满足成像分辨率要求，且利于双基构型下制导控制。最后，通过仿真结果验证了设计方案的合理性。%Existing terminal guidance technologies in monostatic platform cannot distinguish targets effi-ciently when missile attacks targets against complicated background.As a solution,bistatic forward-looking synthetic aperture radar (SAR)is applied to diving and attacking period,Missile-borne bistatic forward-looking synthetic aperture radar (MBFL-SAR)could perform two-dimensional (2D)high-resolution imaging and passive homing during the whole terminal diving period of missile.The trajectory of irradiating missile acting as trans-mitter has great influence on imaging resolution of bistatic platform and guidance precision.Firstly,the resolu-tion property of the special configuration in diving period is analysed,and then a design method of trajectory based on a linearly attenuating model is developed.This model can satisfy imaging resolution,and is also propi-tious to guidance in bistatic platform.Finally,simulation results show the validity of the proposed method.