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The Scientific World Journal
Volume 2014 (2014), Article ID 852539, 10 pages
Research Article

Correction of Faulty Sensors in Phased Array Radars Using Symmetrical Sensor Failure Technique and Cultural Algorithm with Differential Evolution

1School of Engineering & Applied Sciences, ISRA University, Islamabad 44000, Pakistan
2Electrical Department, Air University, Islamabad 44000, Pakistan
3Institute of Signals, Systems and Soft Computing (ISSS), Islamabad 44000, Pakistan
4Electronic Engineering Department, IIU, H-10, Islamabad 44000, Pakistan

Received 30 August 2013; Accepted 17 November 2013; Published 29 January 2014

Academic Editors: Z. Cui and X. Yang

Copyright © 2014 S. U. Khan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Three issues regarding sensor failure at any position in the antenna array are discussed. We assume that sensor position is known. The issues include raise in sidelobe levels, displacement of nulls from their original positions, and diminishing of null depth. The required null depth is achieved by making the weight of symmetrical complement sensor passive. A hybrid method based on memetic computing algorithm is proposed. The hybrid method combines the cultural algorithm with differential evolution (CADE) which is used for the reduction of sidelobe levels and placement of nulls at their original positions. Fitness function is used to minimize the error between the desired and estimated beam patterns along with null constraints. Simulation results for various scenarios have been given to exhibit the validity and performance of the proposed algorithm.