Dual frequency water vapor radiometer.
Abstract
A steerable dual frequency water vapor radiometer (DFWVR) is developed. A pair of optimum frequencies, 20.60 and 31.65 GHz, is adopted. Each frequency channel has its own offset parabola antenna and Dicke switched receiver, but both channels are mounted on one rotatable pedestal and controlled by one microcomputer system. This DFWVR is capable of continuous, unattended operation. The sensitivity at 1 second time constant and the accuracy of the brightness temperature are 0.2 and 0.5K, respectively, at both frequencies. It is expected to promote the excess path length corrections to be better than 1 cm for geodetic VLBI and GPS measurements.
- Publication:
-
URSI/IAU Symposium on Radio Astronomical Seeing
- Pub Date:
- 1990
- Bibcode:
- 1990ursi.symp...87X
- Keywords:
-
- Microwave Radiometers;
- Rangefinding;
- Seeing (Astronomy);
- Water Vapor;
- Atmospheric Temperature;
- Geodesy;
- Global Positioning System;
- Microwave Antennas;
- Very Long Base Interferometry;
- Instrumentation and Photography;
- Radiometers