Target localization with NLOS circularly reflected AOAS

Abstract

Bearings-only localization with light-of-sight (LOS) propagation is well understood. This paper concentrates on bearing-only localization with non-line-of-sight (NLOS) measurements, where the target radiation arrives at the sensor after a specular reflection. The wrinkle is that the reflecting surface is circular (inner side of a circle), and is assumed known. Since the target-sensor geometry has multiple configurations, the maximum likelihood (ML) solution may not exist. However, if a concentric opaque circle (such as the earth) exists within the reflecting one, the propagation path is unique; a grid search based ML is available for such a circumstance. Since ML is computationally consuming, two suboptimal algorithms based on small angle approximation are developed. Their performances are numerically compared.

Angle of arrival‐based target localisation with low Earth orbit satellite observer

“…In [11], the authors have examined LS, maximum likelihood, and Stansfield approximation to find the target location on the surface of the spherical earth. However, their results are limited to few degrees of distances over the Earth surface.…”