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  1. (西安电子科技大学 雷达信号处理重点实验室, 陕西 西安 710071)

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2003-04-20 发布日期:2003-04-20

Keystone transformation based ISAR imaging at the low SNR level

CHEN Wen-chi;BAO Zheng;XING Meng-dao


  1. (Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an 710071, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-04-20 Published:2003-04-20

摘要: 在ISAR成像中,当目标平稳飞行时,对于低信噪比的回波数据,常规的运动补偿方法不再适用,故提出一种基于Keystone变换的运动补偿方案,完成对低信噪比数据的处理. 利用Keystone变换校正由目标速度引起的线性距离走动,通过对相邻距离像相干积累以提高数据信噪比,进而引入相关法和PGA法完成对高次项运动的补偿. 仿真实验的结果表明,针对低信噪比数据的处理,基于Keystone变换的运动补偿方法优于传统的方法,从而有效地提高了成像雷达的作用距离.

关键词: 逆合成孔径雷达, 低信噪比, Keystone变换


In the process of the ISAR data with a low input SNR when the target is flying smoothly, the conventional motion compensation method is no longer valid. In this paper, a new motion compensation method based on the Keystone transformation is proposed for dealing with the data with a low input SNR. The Keystone transformation is used to eliminate the effects of linear range alignment caused by the radial velocity of the target. By coherently accumulating the adjacent range profiles, the SNR is increased so that the envelope correlation and PGA algorithms can be applied to compensate the high order radial motion. The simulation results show that, for the process of the data with a low input SNR, the performance of the method proposed in this paper is better than that of the classical method, so that it is possible to increase the radar range at which targets can be imaged.

Key words: inverse synthetic aperture radar, low SNR, Keystone transformation


  • TN957.51