Aspects of Radar Imaging Using Frequency-Stepped Chirp Signals

The high-resolution, frequency-stepped chirp signal can be applied to radar systems employing narrow-bandwidth chirp pulses, in order to enhance the range resolution, and to implement SAR/ISAR imaging capabilities. This paper analyzes the effect of moving targets on the synthetic high-resolution range profile obtained using this signal waveform. Some constraints are presented for compensation of the radial motion from shift and amplitude depression of the synthetic range profile. By transmitting two chirp pulses with the same carrier frequency in a pulse-set, a method of ground clutter cancellation is designed with respect to this signal format. Finally, our simulation data demonstrate the effectiveness of the proposed method.

[1]  D. Wehner.  High Resolution Radar , 1987 .

[2]  I. Gladkova,et al.  Suppression of grating lobes in stepped-frequency train , 2005, IEEE International Radar Conference, 2005..

[3]  D. J. Rabideau,et al.  Nonlinear synthetic wideband waveforms , 2002, Proceedings of the 2002 IEEE Radar Conference (IEEE Cat. No.02CH37322).

[4]  Zheng Bao,et al.  The minimum entropy criterion of range alignment in ISAR motion compensation , 1997 .

[5]  P. Berens.  SAR with ultra-high range resolution using synthetic bandwidth , 1999, IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99 (Cat. No.99CH36293).

[6]  Nadav Levanon,et al.  Nullifying ACF grating lobes in stepped-frequency train of LFM pulses , 2003 .

[7]  Mengdao Xing,et al.  Time-frequency approaches to ISAR imaging of maneuvering targets and their limitations , 2001 .

[8]  Tao Zhang,et al.  Imaging of moving target in strong ground clutter , 2001, 2001 CIE International Conference on Radar Proceedings (Cat No.01TH8559).

[9]  Michael Inggs,et al.  High resolution SAR processing using stepped-frequencies , 1997, IGARSS'97. 1997 IEEE International Geoscience and Remote Sensing Symposium Proceedings. Remote Sensing - A Scientific Vision for Sustainable Development.

[10]  R. Bose,et al.  Thinned stepped frequency waveforms to furnish existing radars with imaging capability , 1996, Proceedings of the 1996 IEEE National Radar Conference.

[11]  F. McGroary,et al.  A stepped chirp technique for range resolution enhancement , 1991, NTC '91 - National Telesystems Conference Proceedings.

[12]  Helmut Essen,et al.  High range resolution by means of synthetic bandwidth generated by frequency-stepped chirps , 2003 .

[13]  Qun Zhang,et al.  ISAR imaging in strong ground clutter using a new stepped-frequency signal format , 2003, IEEE Trans. Geosci. Remote. Sens..

[14]  Jerry L. Eaves,et al.  Introduction to Radar , 1987 .

[15]  D. E. Maron.  Frequency-jumped burst waveforms with stretch processing , 1990, IEEE International Conference on Radar.

[16]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.