51 citations · 51 across the 4 of their papers we have counts for
4 papers
State estimation of a moving frequency source from observations at multiple receivers
Michela Mancini, Anton Leykin, John A. Christian
The task of position and velocity estimation of a moving transmitter (with either a known or unknown frequency) is a common problem arising in many different application domains. B…
Pole Estimation and Optical Navigation using Circle of Latitude Projections
John A. Christian
Images of both rotating celestial bodies (e.g., asteroids) and spheroidal planets with banded atmospheres (e.g., Jupiter) can contain features that are well-modeled as a circle of…
Initial Orbit Determination from Only Heading Measurements
John A. Christian
This work introduces the problem of initial orbit determination (IOD) from only heading measurements. Such a problem occurs in practice when estimating the orbit of a spacecraft us…
Lunar Crater Identification in Digital Images
John A. Christian, Harm Derksen, Ryan Watkins
It is often necessary to identify a pattern of observed craters in a single image of the lunar surface and without any prior knowledge of the camera's location. This so-called "los…