Patent ID: 6992624
Filing Date: 2006-01-31
Classification: G01S

Abstract:
1. An apparatus for determining attitude comprising: an antenna array arranged to receive signals from radiating sources outputting coded signals, where the antennas in the array are spacially arranged in a known pattern; means for measuring the phase of the radiating sources' signals received at each antenna; means for determining the position of the array; means for determining the position of a first radiating source, means for combining the measured phase signals from the antennas and the pattern of the antennas to create a first null, wherein the first null points at the first radiating source, and wherein the direction of the first null is the attitude of the first radiating source relative to the antenna array, means for calculating the attitude of a second radiating source from its signals; means for measuring the phase of signals from the second radiating source; means for combining the measured phase signals to create a second null that points to the second radiating source; means for determining the position of the second radiating source, and; means for combining the directions of the two nulls to determine the antenna array's orientation either in an Earth based or other co-ordinate system.