Patent ID: 6727843
Filing Date: 2004-04-27
Classification: F41G

Abstract:
A method for determining an angle of roll of a launchable body launched from a launching device, said launchable body rotating along a trajectory thereof, the method comprising:essentially aligning a main pattern of a transmitter antenna arranged on the launching device with a main pattern of a receiver antenna coupled to a receiver arranged on the launchable body; sweeping the main pattern of the transmitter antenna in a fixed plane relative to the launching device; sweeping the main pattern of the receiver antenna in a fixed plane relative to the launchable body; detecting a plurality of time intervals in which the main pattern of the transmitter antenna and the main pattern of the receiver antenna coincide; recording a received signal strength during each of the plurality of time intervals; creating a rotational envelope in the receiver using the recorded signal strengths; and determining the angle of roll of the launchable body using the rotational envelope and the plurality of time intervals.