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本文利用板块法对运动目标进行电磁仿真,根据Stratton-Chu积分,通过目标CAD造形和表面板块生成,每一板块元与目标实际表面之间的最大误差不得大于入射雷达波波长的十六分之一,从而将目标的三维曲面矢量电磁散射积分简化为每一板块面元上的二维平面矢量积分之和,获得静止目标的散射场,然后通过目标运动轨迹模拟,考虑由于目标的运动而引起的雷达回波相位的变化,实现运动目标的电磁仿真。利用这种电磁仿真方法模拟产生64×128个回波数据,用频域法进行距离对准,用最大似然方法进行相位补偿,目标轨迹运动引起的距离变化用时间的二次函数拟合,研究了用X波段雷达对一架匀速直线飞行飞机的ISAR运动补偿和成像。
According to the Stratton-Chu integral, through the target CAD modeling and surface plate generation, the maximum error between each plate element and the actual surface of the target should not be greater than the sixteenth of the wavelength of the incident radar wave Firstly, the integral of the target 3D electromagnetic scattering is reduced to the sum of the two-dimensional planar vector integrals of each plate, and the stationary field of the scattering field is obtained. Then, the trajectory of the target is simulated and considered as a result of the movement of the target Of the radar echo phase changes to achieve the electromagnetic movement of the target simulation. Using this electromagnetic simulation method to generate 64 × 128 echo data, frequency domain method for distance alignment, maximum likelihood method for phase compensation, the target trajectory caused by distance variation with time quadratic function fitting, The ISAR motion compensation and imaging of a uniform linear flight aircraft using X-band radar are studied.