Error Bounds on Estimated Azimuthal and Vertical Arrival Angles at a Rotatable Horizontal Line

摘要

A Horizontal Line Array (HLA) is subject to left-right bearing ambiguity and also to bearing bias caused by non-zero vertical arrival angles. However, if a second observation is made with the array rotated to a different orientation, the azimuthal and vertical arrival angles may be estimated. For two observations where the source-array geometries are static, a closed form solution is available. For the solution error, a closed-form approximation is also available, but only if the observation errors are small. This report deals with the case of moderate to large observation errors and presents error bounds on the estimated azimuthal and vertical arrival angles. As well, several examples are included. Keywords: Sonar Arrays; Canada. (jhd)