A Noise Re-radiation Calibration Technique in Interferometric Synthetic Aperture Radiometer for Sub-Y-type Array at Ka-Band

  • Seo Seungwon (Sensor System Laboratory, Department of Mechatronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Kim Sunghyun (Sensor System Laboratory, Department of Mechatronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Choi Junho (Sensor System Laboratory, Department of Mechatronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Park Hyuk (Sensor System Laboratory, Department of Mechatronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Lee Hojin (Sensor System Laboratory, Department of Mechatronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Kim Yonghoon (Sensor System Laboratory, Department of Mechatronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Kang Gumsil (Satellite Application Department Korea Aerospace Research Institute)
  • Published : 2004.10.01

Abstract

To overcome with large size noise source distribution network design difficulty in interferometric radiometer system, especially for sub-Y-type array, a new on-board calibration technique using noise re-radiation is proposed in this paper. The suggested calibration technique is using noise re-radiation effect of center antenna after noise source injection from matched load. This approach is especially proper to sub-Y-type array interferometric synthetic aperture radiometer in mm-wave frequency band. Compared with noise injection network of a conventional synthetic aperture radiometer, the system mass, volume, and hardware complexity is reduced and cost-effective. Only one internal noise source, matched load, is used for injection using noise re-radiation technique a small set of sub-Y receiver channels is calibrated. Detailed calibration scenario is discussed and simulation results about noise re­radiation effect are presented.

Keywords