An all-digital image synthesizer for countering high-resolution imaging radars
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Authors
Pace, Phillip E.
Ekestrom, S.
Karow, C.
Fouts, D.
Subjects
Advisors
Date of Issue
2000-02-24
Date
Publisher
Naval Postgraduate School
Language
en_US
Abstract
A digital image synthesizer (DIS), especially useful as a counter-targeting signal repeater, (i.e., for synthesizing the characteristic echo signature of a pre-selected target) is reported. The DIS has a digital radio frequency memory (DRFM) and associated circuitry, including digital tapped delay lines and a modulator in each delay line to impose both amplitude and frequency modulation in each line. A unique property of the digital image synthesizer is its ability to synthesize false targets using wideband chirp signals of any duration. To generate the target, the user can program the target extent (number of taps) and the amplitude and Doppler frequency of each range-Doppler cell within the image. The system-on-a-chip uses a scalable CMOS technology that increases the bandwidth and sensitivity of such a repeater over prior analog based systems. The application specific integrated circuit reduces the noise of the repeated signal, reduces the size and cost of such a system, and permits real time alteration of operating parameters, permitting rapid and adaptive shifting among different types of targets to be synthesized. A scan path test capability is also included to allow intre-schip signal analysis and verification.
Type
Technical Report
Description
Series/Report No
Department
Electrical and Computer Engineering
Identifiers
NPS Report Number
NPS-EC-00-005
Sponsors
Office of Naval Research, Code ONR-313EW, Arlington, VA 22217-5660