Title :
A cross beam interferometer radiometer for high resolution microwave sensing
Author_Institution :
Lockheed Missiles & Space Co. Inc., Palo Alto, CA, USA
fDate :
Jan. 31 1993-Feb. 5 1993
Abstract :
The conceptual design of a cross beam interferometer radiometer (CBIR) for sea surface temperature sensing at 5.0 GHz is described. In a 833-km orbit, the radiometer provides 0.48 K sensitivity with a spatial resolution less than 25 km in a 1561-km swath. The radiometer consists of a pair of rectangular phased arrays in a T configuration. Each array forms ten colinear beams that project ten pairs of crossed elliptical footprints on the sea surface. The footprints from the horizontal array have minor axes that range from 14.6 km to 22.9 km and are oriented in the cross-track direction. The footprints from the vertical array have minor axes that range from 18.6 km to 25.0 km and are oriented in the along-track direction. The Mills periodic 0-180 degrees switching radio telescope technique is used to sense the variations in sea surface radio-thermal brightness temperature in the coincidence areas where the beams overlap. The CBIR concept, system design approach, antenna design and beamforming technique are described.<>
Keywords :
antenna phased arrays; microwave measurement; oceanographic techniques; radiowave interferometers; remote sensing; temperature measurement; 5.0 GHz; 833 km; EHF; SST; T configuration; coincidence areas; colinear beams; cross beam interferometer radiometer; cross-track direction; crossed elliptical footprints; footprints; high resolution microwave sensing; horizontal array; measurement; microwave; minor axes; ocean; radio-thermal brightness temperature; radiometry method; rectangular phased arrays; remote sensing; satellite; sea surface temperature sensing; switching radio telescope; technique; vertical array; Array signal processing; Brightness temperature; Microwave radiometry; Milling machines; Ocean temperature; Phased arrays; Radio astronomy; Sea surface; Spatial resolution; Temperature sensors;
Conference_Titel :
Aerospace Applications Conference, 1993. Digest., 1993 IEEE
Conference_Location :
Steamboat, CO, USA
Print_ISBN :
0-7803-0980-4
DOI :
10.1109/AERO.1993.255331
