基于ISAR像序列的锥体目标进动及结构参数估计

弹道目标进动及结构参数的提取是弹道导弹目标识别的关键。该文提出一种基于逆合成孔径雷达(ISAR)像序列实现锥体目标进动及结构参数估计的方法。基于电磁仿真数据及锥体目标的微动特性，忽略旋转对称锥体目标的自旋运动，采用距离-瞬时多普勒算法生成目标的ISAR像序列，之后采用CLEAN算法将ISAR像序列中的强散射源坐标信息提取出来；推导了锥体滑动型强散射源在成像平面上的投影轨迹公式，该公式可为进动锥体目标成像特性模拟及参数估计提供数学参考。分析观察视角对锥体目标ISAR像可观测强散射源的影响，给出了估计进动及结构参数的具体方法；最后仿真验证了成像算法及投影轨迹公式的正确性，并依据提取的坐标信息估计目标的进动及结构参数信息。

Precession and Structure Parameters Estimation of Precession Cone Target Based on ISAR Image Sequence

The extraction of the procession and structure parameters for ballistic targets is a critical point for success of the ballistic target identification. This paper proposes a method to deduct the procession and structure parameters of a cone target based on the Inverse Synthetic Aperture Radar (ISAR) sequences. The time-frequency ISARs of the symmetrical cone target are simulated by the range-instantaneous Doppler algorithm, which is based on the electromagnetic simulation data and micro-motion characteristics of the cone target, and the spin motion of the rotational symmetry cone target is ignored. The location information of strong scattering sources is extracted by the CLEAN algorithm besides; the formula of the projection of the slip-type strong scattering sources on the imaging plane is deduced, which can provide mathematics reference for the imaging simulation and parameter estimation of the precession cone target. The strong scattering sources affected by viewing angle is analyzed and the method of inversion of the procession and structure parameters is given. Finally, the simulation result shows that the imaging algorithm and the formula of the projection of the slip-type strong scattering sources on the imaging plane are correct, the procession and structure parameters are inverted by the location information of the strong scattering sources obtained.