TerraSAR-X Antenna Calibration and Monitoring Based on a Precise Antenna Model

The high flexibility and tight accuracy requirements of modern spaceborne synthetic aperture radar (SAR) systems require innovative technologies to calibrate and process SAR images. To perform accurate pattern correction during SAR processing, an antenna model can be used to derive the multitude of different antenna beams generated by active antenna steering. The application of such an antenna model could be successfully demonstrated for the TerraSAR-X mission, launched in 2007. The methodology and the results of the in-orbit verification with an achieved accuracy of better than ±0.2 dB are reviewed in this paper in detail, showing its outstanding accuracy. Additionally, the results of the antenna pattern long-term monitoring are described, pointing out the high stability of the system.

[1]  Josef Mittermayer,et al.  Investigations on the TOPSAR acquisition mode with TerraSAR-X , 2007, 2007 IEEE International Geoscience and Remote Sensing Symposium.

[2]  A. P. Luscombe,et al.  RADARSAT-2 calibration: proposed targets and techniques , 2001, IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217).

[3]  M. Schwerdt,et al.  TerraSAR-X Antenna Pattern Estimation by a Complex Treatment of Rain Forest Measurements , 2006, 2006 IEEE International Symposium on Geoscience and Remote Sensing.

[4]  M. Zink,et al.  Antenna Elevation Pattern Estimation from Rain Forest Acquisitions , 2003 .

[5]  Constantine A. Balanis,et al.  Antenna Theory: Analysis and Design , 1982 .

[6]  Marco Schwerdt,et al.  Radar Instrument Calibration of TerraSAR-X , 2008 .

[7]  B. Grafmuller,et al.  The TerraSAR-X antenna system , 2005, IEEE International Radar Conference, 2005..

[8]  Marco Schwerdt,et al.  An Efficient Method for Performance Monitoring of Active Phased Array Antennas , 2009, IEEE Transactions on Geoscience and Remote Sensing.

[9]  S. Buckreuss,et al.  The German satellite mission TerraSAR-X , 2008 .

[10]  Marco Schwerdt,et al.  The calibration concept of TerraSAR-X: a multiple-mode, high-resolution SAR , 2005 .

[11]  M. Bachmann,et al.  Final results of the efficient TerraSAR-X calibration method , 2008, 2008 IEEE Radar Conference.

[12]  Marco Schwerdt,et al.  TerraSAR-X Calibration Ground Equipment , 2007 .

[13]  M. Bachmann,et al.  The TerraSAR-X Antenna Model Approach , 2007, 2007 2nd International ITG Conference on Antennas.