Accession Number : ADP006292

Title :   Effects of Ionospheric Scintillation on DPCA Clutter Rejection Performance,

Corporate Author : MISSION RESEARCH CORP CARMEL CA

Personal Author(s) : Reinking, J. T. ; Moody, Trent N. ; Knepp, Dennis L.

Report Date : 03 MAY 1990

Pagination or Media Count : 9

Abstract : Detection of moving targets by Space-Based Radar (SBR) will be significantly affected by the SBR platform motion. This motion will both shift and spread the clutter spectrum associated with stationary returns, degrading the SBR performance. A technique for compensating for spectrum spreading effects due to motion is to include a displaced phase center antenna (DPCA) as part of the clutter rejection system. Calculations taking into account ionospheric scintillation of the clutter improvement factor (CIF) for such a system have been performed previously. However, to date these calculations have assumed a gaussian correlation function for the ionosphere scintillation component of the radar return envelope. The effects of ionospheric scintillations are obtained employing current models for ionospheric electron density irregularities, and propagating signals through these irregularities taking into account the detailed geometry of the relevant two-way propagation paths. These CIF calculations then allow DPCA performance for an SBR to be evaluated as a function of both scintillation levels. It is shown that ionospheric scintillation can significantly effect the CIF for a DPCA system, and impose critical performance constraints.

Descriptors :   *RADAR SIGNALS, *SIGNAL PROCESSING, PHASED ARRAYS, RADAR ANTENNAS, MOTION, COMPENSATION, SPACE BASED, CORRELATION TECHNIQUES, IONOSPHERIC SCINTILLATION, SPREAD SPECTRUM, ELECTRON DENSITY, RADAR REFLECTIONS.

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE