DESIGN, DEVELOPMENT, AND INITIAL MEASUREMENTS OF A 1.4-mm RADIOMETRIC SYSTEM.
Abstract
The development of a 1.4-mm heterodyne radiometric system and the initial measurements taken with it are described. The delta T of the system at the antenna terminals was approximately 18.6 K for a 0.25-Hz post-correlation noise bandwidth. Measurements show that the attenuation through the atmosphere at this wavelength is primarily due to water vapor, and an estimate of the zenith attenuation is given by A(dB) = 2.8 w, where w is the precipitable water in centimeters. Measurements of the antenna half-power beamwidths using the sun as a source show that at 1.4 mm, the atmospheric turbulence effects are not appreciable for observations through the atmosphere at zenith angles less than 45 deg with a 15-ft antenna. (author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 15, 1970
- Accession Number
- AD0704584
Entities
People
- Fred I. Shimabukuro
- Tsutomu T. Mori
- Walter A. Johnson
Organizations
- The Aerospace Corporation