Patent ID: 7324041
Filing Date: 2008-01-29
Classification: G01S

Abstract:
1. A method for calculating an angle for first and second RF signals comprising the steps of: (a) receiving a combined RF signal which includes said first RF signal reflected from a dominant target and said second RF signal from a secondary target, wherein said first and second RF signals have different frequencies and are offset in angle from one another; (b) calculating a dominant signal angle for said first RF signal by providing an average of a composite angle for said combined RF signals over a frequency difference period; (c) providing an angle centroid between said first and second RF signals wherein said angle centroid is provided by an angle at which peaks in power return for said combined RF signals occur; (d) calculating a voltage magnitude for each of said first and second RF signals wherein said voltage magnitude is calculated from peak and minimum power values for said combined RF signals; and (e) calculating a smaller signal angle for said second RF signal wherein said smaller signal angle is calculated from said dominant signal angle, said angle centroid, and the voltage magnitude for each of said first and second RF signal.