EE Seminar: Direct Emitter Geolocation under Local Scattering
~~Speaker: Ofer Bar-Shalom
Ph.D. student under the supervision of Prof. Anthony Weiss
Wednesday, November 4th, 2015 at 15:00
Room 011, Kitot Bldg., Faculty of Engineering
Direct Emitter Geolocation under Local Scattering
Abstract
We address the problem of emitter geolocation, which over the recent decades, has attracted both academic and industrial attention. In particular, direct (single-step) geolocation methods have been explored extensively throughout the past decade. Yet, in most of the publications investigating direct geolocation performance, the emitting source is modeled as a point source in the 2D or 3D space. While enabling some important insights into the fundamental limitations of single-step emitter geolocation, the rather simplistic point-source model rarely provides a high-fidelity representation of the emitter signal in a multipath-dense environment. Such an environment is typically crowded with scatterers surrounding the emitter and reflecting its signal towards the receiving array. In such case, the emitter is not perceived as a point but rather as a “scattered” or as a “distributed” source.
In this lecture we present the problem of emitter geolocation in the local scattering environment. We derive an analytic model for the received signal where the local scattering environment is modeled as a stochastic process using the Gaussian Angle of Arrival (GAA) model. For the signal model, we present both optimal and sub-optimal, computationally-simpler, 1-step (direct) emitter geolocation algorithms.
The proposed algorithms enable estimation of the emitter's position directly, using the received signal samples. The algorithms extract the emitter position information from both fading channel statistics, as well as temporal correlations when the fading channel is quasi-static. We demonstrate that the devised 1-step algorithms outperform 2-step emitter geolocation algorithms, formerly proposed for the problem.
The results presented in this lecture have been published in the paper:
O. Bar-Shalom and A. J. Weiss, “Direct Emitter Geolocation under Local Scattering,” Signal Processing, vol. 117, pp. 102-114, Dec. 2015.
