METHOD AND APPARATUS TO DETERMINE A TARGET LOCATION IN BODY COORDINATES

摘要

A method for determining a position of a doppler radar target in aircraft body coordinates is described. The method includes calculating values for doppler circle equations (620), in doppler coordinates, based upon a range to the target, a vehicle velocity, and a center frequency and bandwidth of a doppler swath filter. Further, an interferometric circle (622) in body coordinates is calculated based upon a range to the target, and an interferometric angle. The doppler circle equations are transformed into bady coordinates (624) utilizing received pitch, roll and yaw information. Finally, an intersection (626) of the interferometric circle equations with the transformed doppler circle equations is calculated, the intersection being the position of the target in body coordinates.