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This document is a continuation of work derived in "A Method for the Determination of Target Aspect Angle with Respect to a Radar" by Caraway and Abell. The original paper derived the target aspect angle assuming that the radar would be emplaced level with respect to gravity. With the need for rapid and flexible emplacement, some radars may be designed to allow for unlevel operation. Aspect angle determination is essential in many forms of Noncooperative Target Identification (NCTI). This document presents a rigorous development of the mathematics for solving for target aspect angle given target and radar position and attitude. A method for aspect angle estimation given target track data will also be presented.

In the post Gulf War era, significant effort has been expended in the area of Non-Cooperative Target Identification (NCTI). The techniques proposed for use with radar systems all have a common feature: the need to use target aspect angle with respect to (w.r.t.) the direction of arrival of the radar signal to reduce the problem to a manageable size. This paper will present a rigorous development of the mathematics for solving this problem exactly given target position and attitude data; and then, develop the mathematics for solving this problem when only the radar's positional measurement of the target is available. Finally, data will be presented to show the practical accuracy limits of aspect angle calculations using radar data.