Accession Number : ADP006290

Title :   VHF/UHF Radar Scintillation Effects Observed by ALTAIR,

Corporate Author : MISSION RESEARCH CORP CARMEL CA

Personal Author(s) : Knepp, Dennis L. ; Houpis, Harry L.

Report Date : 03 MAY 1990

Pagination or Media Count : 10

Abstract : During the PEAK (Propagation Effects Assessment - Kwajalein) experiment in August 1988, The ALTAIR VHF/UHF wide bandwidth radar was used to track spherical satellite in low-earth orbit. The purpose of the experiment was to obtain radar data during the most severe propagation disturbances available naturally. The PEAK experiment has been quite successful, giving many measurements of strong scintillation as well as the first measurements of frequency-selective fading on propagating radar pulses. This high level of scintillation severity is statistically similar to that likely to be encountered over large spatial and temporal extent if the ionosphere were disturbed by a high-altitude nuclear detonation. The paper describes the measurements that were obtained during the track of several spherical U.S. and Soviet calibration satellites. The use of spherical satellites eliminates the problem of target glint that causes fluctuation in the received signal due to interference from multiple target scatterers. Unique measurements were obtained during PEAK of severe frequency-selective scintillation during several passes of Cosmos 1427, a 2-meter diameter sphere.

Descriptors :   *IONOSPHERIC SCINTILLATION, *RADAR REFLECTIONS, DISTORTION, ULTRAHIGH FREQUENCY, VERY HIGH FREQUENCY, RADAR TRACKING, ARTIFICIAL SATELLITES, SPHERES, BROADBAND.

Subject Categories : Atmospheric Physics
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE