提出了一种基于天基合成孔径雷达平台实现空中高机动目标的检测方法,相比于逆合成孔径雷达系统实现空中运动目标检测具有极大的灵活性。同时,文中充分考虑了空中运动目标(如飞机、导弹等)的机动性,区别于现有合成孔径雷达地面动目标显示方法对空中机动目标进行匀速直线运动的假设,因此文中方法更具有实际应用的价值。文中方法先采用相邻互相关方法对运动目标进行降阶处理,通过keystone 方法对动目标进行统一的走动校正,然后对动目标信号进行变尺度的维格纳威尔分布变换,最后通过傅里叶变换能够充分实现对机动目标的有效相干积累,因而适用于低信噪比下对空中机动目标的检测。

An air high maneuvering target detection method based on the space-based synthetic aperture radar platform is proposed in this paper. Compared with the inverse synthetic aperture radar system, the proposed method in this paper is more flexible. At the same time, the maneuverability of air moving targets (such as aircraft, missiles, etc. ) is fully considered in this paper, which is different from the existing synthetic aperture radar-ground moving target indication method on the assumption of uniform linear motion of air moving targets. In this paper, the adjacent correlation processing is used to correct the envelope migration of the moving target. The keystone transform method is used to perform a unified movement correction on the target, and then the moving target signal is subjected to a variable scale Wigner Ville distribution transform. Finally, the effective coherence of the maneuvering target can be realized by the Fourier transform. Therefore, the proposed method is suitable for the detection of air maneuvering targets under the condition of low signal-to-noise ratio.

TN957.72