@conference {294,
	title = {Doppler Shift from Earth-Orbiting Satellites},
	booktitle = {HamSCI Workshop 2019},
	year = {2019},
	month = {03/2019},
	publisher = {HamSC},
	organization = {HamSC},
	address = {Cleveland, OH},
	abstract = {<p>Doppler shift, which is easily observable as a change in frequency, is due to a change in the phase path between an emitter and observer over time.\&nbsp; The changing phase path contains information about the position of the emitter as well as the propagation medium.\&nbsp; This presentation describes an effort to estimate the Doppler shift of the now-defunct VO-52 ({\textquotedblleft}HAMSAT{\textquotedblright}) satellite at 145 MHz and theoretical concepts of orbit determination by trilateration.\&nbsp; It is similar to work performed in the West during the early weeks of the Space Race that determined the orbit of Sputnik-I and led to the development of the satellite Doppler navigation (TRANSIT) technique.</p>
},
	author = {Michael S. Miller and Ethan S. Miller}
}
