Date of Award

12-1997

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Electrical and Computer Engineering

First Advisor

Michael A. Temple, PhD

Abstract

The purpose of this research was to evaluate how current cross-eye techniques protect an airborne platform versus a pulse-to-pulse Radio Frequency (RF) agile monopulse processing threat and, if necessary, develop a new cross-eye techniques to counter this threat. This research evaluates how both current retrodirective cross-eye techniques and an original technique, namely synchronized cross-eye, hide the true skin return in the time and frequency domain while preserving the necessary phase interferometric effects at the threat radar location. Existing retrodirective cross-eye techniques are inadequate to counter the RF agile threat due to propagation delays. Using modeling and simulation, the research shows that geometrically dependent parameters are virtually constant on a pulse-to-pulse basis. If a low Radar Cross Section source can be deployed and, given that it is illuminated first by the threat radar, cross-eye jamming waveforms at the threat can hide the skin return in time and reproduce the necessary phase interferometric pattern, but small frequency differences between the two jamming sources occur at the threat radar location. Fortunately, these differences can only be detected if the threat employs up-front Doppler processing. Monopulse processing radars are a true threat to airborne platforms. Existing countermeasure techniques may not be able to deal with a monopulse processing radar with random, pulse-to-pulse Radio Frequency (RF) agility. This thesis examines the effects current cross-eye techniques have against RF agile threats and investigates an alternative form of cross-eye, synchronized cross-eye, to counter RF agile threats.

AFIT Designator

AFIT-GE-ENG-97D-15

DTIC Accession Number

ADA339251

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