An Analysis of AOA Measurement Error of Airborne Collision Avoidance System
—Effect of the Diffraction by Cylindrical Fuselage—
1995 Volume 1995 Issue 82 Pages 27-37
Details
1995 Volume 1995 Issue 82 Pages 27-37
The error of angle of arrival (AOA) measurement that is observed with electromagnetic wave propagation around the cylindrical fuselage is studied. The AOA is measured with airborne antenna which is used for Airborne Collision Avoidance System. The antenna element is perpendicular to the fuselage surface.
Considerably large error is resulted by the calculation for the diffracted ray path geometry. This error is due to the bend of propagation path on the curved surface of fuselage, and can degrade the accuracy of any AOA measurement which is measuring the normal direction of wavefront. The antenna mounting method for error reduction is also discussed in this paper.
