对于机动飞行目标的逆合成孔径雷达(ISAR)成像，当目标近似做等变加速旋转时，其散射点回波为多分量多项式相位信号，此时采用匀加速旋转模型进行距离-瞬时多普勒成像误差比较大，会产生大量虚假散射点。文中对目标回波信号采用分段线性调频信号进行近似，得到了不同时刻的高质量的ISAR瞬态像，仿真数据成像结果表明文中方法的可行性。

When reconstructing ISAR image of a maneuvering target, and the target is rotating approximately with equal changing rate acceleration, the echo is a multi-component polynomial phase signal. If the model of rotating with constant acceleration is used here, the error of the reconstructed image is relatively large and a lot of pseudo scatters are produced. In this paper, the echo is approximated by a segment linear frequency modulation signal, and high quality ISAR instantaneous images at different time are obtained. The result of simulated data shows the effectiveness of the method proposed in the paper.

TN958