On the assessment of errors due to antenna pattern imperfections: Executive summary
Abstract
The relative influence of radiometer parameters such as antenna sidelobe level, antenna cross polarization level and radiometer sensitivity on the measurement of the brightness temperature of the environment and on the estimation of physical parameters was studied in order to optimize specifications of the subsystems in a complete radiometer system. A nonrotational symmetrical pattern for the cross polarized patterns with two main lobes and sine squared theta variations in the theta plane is proposed. Brightness temperature is restored from the output of the two antenna ports by compensating the signal in the far-off sidelobes and in the spillover lobes, and by decoupling of the mixing of polarizations. The influence of cross polarization level on physical parameter estimation is almost eliminated, and sidelobe level influence is reduced.
- Publication:
-
Final Report Technical Univ. of Denmark
- Pub Date:
- January 1982
- Bibcode:
- 1982tudl.rept.....P
- Keywords:
-
- Antenna Radiation Patterns;
- Microwave Radiometers;
- Satellite Antennas;
- Satellite-Borne Instruments;
- Brightness Temperature;
- Cross Polarization;
- Decoupling;
- Equipment Specifications;
- Parameter Identification;
- Communications and Radar