基于运动补偿的弹载前斜视SAR成像算法

张延; 张林让; 唐世阳

doi:10.11999/JEIT161006

基于运动补偿的弹载前斜视SAR成像算法

doi: 10.11999/JEIT161006

基金项目:

国家自然科学基金(61601343, 61671361)

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- 文章访问数: 1355
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- 被引次数: 0
出版历程
- 收稿日期: 2016-09-30
- 修回日期: 2016-11-24
- 刊出日期: 2016-12-19

Novel Missile-borne Forward-looking SAR Algorithm Based on Motion Compensation

Funds:

The National Natural Science Foundation of China (61601343, 61671361)

摘要

摘要: 曲线轨迹下的弹载合成孔径雷达(SAR)前视成像算法校正了方位时不变运动误差，忽略了时变运动误差，造成成像质量下降。针对这一问题，该文提出一种基于运动补偿的前斜视成像算法。首先将加速度分解成前向加速度和径向加速度，然后将径向加速度分解为成像平面内的加速度和垂直于成像平面的加速度，经过分析可知，对成像质量起决定作用的是成像平面内的加速度，该文通过矢量方法将其补偿。此外，对于加速度带来的较大的距离徙动，通过级数反演法求出信号的2维频谱，然后结合非线性频调变标(NCS)算法进行校正，取得了良好的效果。最后通过仿真实验证明了所提算法的有效性。
- 运动补偿 /
- 曲线轨迹 /
- 弹载 /
- 非线性频调变标算法 /
- 级数反演法
Abstract: For missile-borne forward-looking SAR in curve trajectory, time-variant motion errors are ignored, leading to degradations in imaging result. This paper proposes a missile-borne forward-looking SAR algorithm based on motion compensation to solve the above problem. The acceleration is divided into forward-looking acceleration and cross-track acceleration, the second phase error and cubic phase error caused by these two accelerations are analyzed in detail. For the cross-track acceleration component, it can be divided into the acceleration vertical to the imaging plane and the one in imaging plane further. Via such dividing, the phase errors caused by acceleration are compensated by using vectorial methods. Moreover, for range migration, it is compensated through Nonlinear Chirp Scaling (NCS) approach based on the accurate 2-D spectrum acquired by the Method of Series Reversion (MSR). The simulated results are given to illustrate the validity of the proposed algorithm.
- Motion compensation /
- Curve trajectory /
- Missile-borne /
- Nonlinear Chirp Scaling (NCS) algorithm /
- Method of Series Reversion (MSR)

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参考文献(23)

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