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FOURTH ANNUAL
ASAP '96 WORKSHOP


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3-D Jammer Localization

Scott D. Coutts
MIT Lincoln Laboratory
244 Wood Street
Lexington, MA 02173-9108
tel: (617) 981-5789
email: scoutts@ll.mit.edu

Abstract Passive jammer localization is an important ECCM technique concerned with the estimation of jammer location parameters such as azimuth, range, heading, velocity, etc. Commonly used localization techniques employ correlators to estimate Time-Difference-of-Arrival (TDOA) for delayed (and possibly Doppler shifted) replicas of the jamming waveform received by multiple sensors or by a single sensor in conjunction with specular multipath. The desired location parameters are obtained by solving a set of nonlinear equations based on the TDOA estimates and knowledge of the sensor positions. This paper contains a discussion of passive localization techniques and the development of a new technique which exploits out-of-plane jammer multipath signals. A simple statistical model is presented and used to derive the maximum likelihood estimator and the Cramer-Rao lower bounds. Monte-Carlo simulations confirming the estimates and bound calculations are also presented. Several possible jamming waveforms are considered including barrage and narrow-band noise, as well as more sophisticated, self-correlated waveforms. Finally, these techniques are used with Mountaintop field data to estimate the range, heading, and velocity of airborne jammers flying over White Sands Missile Test Range.

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