Blind adaptive beamforming for sonar applications (automatic compensation of the degraded beam pattern caused due to defective sensors in sonar). | [Proceedings 5th International Bhurban Conference on Applied Sciences and Technology • 2007]

Author(s):

1. Husnain A. Naqvi: Muhammad Ali Jinnah University, Islamabad, Pakistan

2. Aqdas Naveed: Muhammad Ali Jinnah University, Islamabad, Pakistan

3. I. M. Qureshi: Muhammad Ali Jinnah University, Islamabad, Pakistan

4. Muhammad Imna: Dean, Pakistan Navy Engineering College Karachi, Pakistan

Abstract:

In this paper we propose use of adaptive beamforming for the beam pattern generation for array of sensors and also highlights the difficulties faced using the sonar with defective/degraded sensors in its optimum levels. The blind adaptive algorithm is designed to compensate the degraded beam pattern due to the defective sensors in sonar. We do not know the exact optimal value of beam pattern (desired response) at the receiver side. So we can not apply the traditional non-blind adaptive algorithm. With the assumption that the initial position of the target is estimated with out errors we shall use adaptive beamforming algorithm for beam pattern generation when the body is fast moving. This can be done by any adaptive algorithm like LMS with combination of classical beamforming techniques. After this model once gets the information about the defective sensors, blind adaptive filter is designed that adjusts the weight of the filter and brings the degraded beam iteratively, very close to the beam, when all the sensors are operational using the blind-adaptive algorithm. Thus allows the Sonar to work in its optimum level all the time without getting the input from the user. This is possible by the use of a beam former based on a computationally efficient, numerically stable and cost effective adaptive algorithm. We begin with a brief introduction to sonar with a possible beam forming configuration for the intended plate form. The result shows that it is feasible to construct a real time acoustic beam former with realistic parameters using this sort of a parallel processing architecture.

Page(s): 75-82

DOI: DOI not available

Published: Journal: Proceedings 5th International Bhurban Conference on Applied Sciences and Technology , Volume: 0, Issue: 0, Year: 2007

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