Speaker: Nadav Shitrit

M.Sc. student under the supervision of Prof. Anthony J. Weiss.

Wednesday, October 17^th, 2018 at 15:00

Room 206, Wolfson Mechanical Eng. Bldg., Faculty of Engineering

Comparison of Single Sensor Emitter Localization Techniques

Abstract

Direct Position Determination (DPD) is a novel method for the geolocation of trans-mitters. The DPD method uses the same data as common methods, except that the location estimation is based on exact maximum likelihood. We present and evaluate an algorithm for the DPD approach, assuming a single moving receiver collecting samples of continuous wave signals produced by a static emitter.

Our approach to the geolocation problem is based on time domain DPD using the complex envelope of the received signal. Similar problems are often solved by the phase unwrapping (PU) procedure. As shown in previous works, the PU method can achieve accurate results; however, its accuracy decreases in the face of errors such as cycle slips.

We compare the performance of the DPD and PU algorithms by computing an expression for the well-known Cramér-Rao Lower Bound (CRLB). Furthermore, we simplify the obtained expression based on flight trajectory restrictions up to compact form. This enables us to analyze the relationship between familiar properties (such as the carrier wavelength and signal-to-noise ratio) and the geolocation accuracy. Perfor-mance is evaluated by Small Error Analysis (SEA).

Monte Carlo simulations are used to corroborate the analytical results. Our analysis shows that both methods converge at a high signal-to-noise ratio (SNR). However, a significant advantage is obtained using DPD over the PU at low SNR.