NDLI: Advanced altimetry

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Advanced altimetry

Content Provider	NASA Technical Reports Server (NTRS)
Author	Selser, A. R. Shirk, D. W. Wright, C. W. Parsons, C. L. Bailey, S. A. Hines, D. E.
Copyright Year	1988
Description	The radar altimeter being developed for the Ocean Topography Experiment (TOPEX) will have an inherent instrument precision of 2 to 3 cm. While some minor refinements may be possible in the future, major geophysical advances could be made if altimetric measurements over a wide swath of the Earth's surface were possible. The NASA Headquarters Oceanic Processes Branch is supporting a 3-year investigation of the technological issues inherent in the precision measurement of topography from spaceborne platforms at angles off-nadir. To explore the off-nadir measurement of topography, a flexible, airborne radar instrument system is being developed. Its hardware design is now complete, and it is made up of several subsystems. The antenna selected is a dielectric lens of .894 m diameter. The RF subsystem uses phase-locked oscillators, FET solid-state amplifiers, and times four frequency multipliers to develop a transmit signal at a frequency of 36.0 GHz and a local oscillator signal at a frequency of 35.4 GHz. Lecroy 6880 digitizers under computer control digitize the five receiver outputs. The digital subsystem consists of six single-board Heurikon processors. At this time, the instrument construction continues with final system integration planned for November 1988.
File Size	134303
Page Count	3
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890018757
Archival Resource Key	ark:/13960/t46q6vd3f
Language	English
Publisher Date	1988-01-01
Access Restriction	Open
Subject Keyword	Airborne Equipment Satellite Altimetry Airborne Radar Swath Width Topography Radio Altimeters Satellite Observation Mission Planning Oceanography Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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