State Initialization using Doppler-Shift of Radio Frequency Signals

This work investigates a number of techniques for estimating the position and velocity of an unknown radio frequency (RF) transmitter. A number of RF observables are considered, including direction of arrival, time difference of arrival, and Doppler shift. Mathematical models are developed for each of these observable types. A root locus technique is developed for localization of a transmitter fixed to the surface of Earth (the so-called geolocation problem). Preliminary analysis and techniques are presented for the localization of an unknown orbiting transmitter.