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Vol. 161, Issue 12, December 2013, pp. 1-5




 Experiments of Phase Errors Estimation and Correction for High-resolution Airborne SAR Imaging
* Qulin TAN, Xiao XU

Photogrammetric Engineering & Remote Sensing, School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China

* Tel.: 086-010-51688207, fax: 086-010-51683764

* E-mail: qltanbjtu@163.com



Received: 14 October 2013   /Accepted: 22 November 2013   /Published: 30 December 2013

Digital Sensors and Sensor Sysstems


Abstract: For the lack of high precision inertial measurement system, the experimental airborne L-band SAR system was badly affected by random phase error induced by motion instability. The resultant SAR images derived from the L-SAR system were out of focus by conventional SAR signal processing and imaging method. It is necessary to estimate and correct phase errors for high resolution SAR imaging. As a prospective scheme to refocus these images, the phase gradient autofocus (PGA) algorithm was studied in the SAR imaging processing. This paper focused on the calculation process of phase error estimation, which was first derived mathematically in detail. Then, the effectiveness of PGA algorithm was tested not only for isolated point scatter scene, but also for various distributed-object scenes to verify its performance. Particularly, a near-range scene, a mid-range scene, and a far-range scene were tested. Experiments show that the imaging algorithm based on phase gradient autofocus can effectively measure and compensate the phase error, thus obtain an obviously improved airborne SAR image in azimuth resolution. The processing results prove the effectiveness of the proposed procedure for high- resolution airborne SAR imaging.


Keywords: Coherent imaging, Phase error, Estimation, PGA, SAR signal processing.


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