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Correction of faulty sensors in phased array radars using symmetrical sensor failure technique and cultural algorithm with differential evolution.

Khan SU, Qureshi IM, Zaman F, Shoaib B, Naveed A, Basit A - ScientificWorldJournal (2014)

Bottom Line: Three issues regarding sensor failure at any position in the antenna array are discussed.We assume that sensor position is known.Fitness function is used to minimize the error between the desired and estimated beam patterns along with constraints.

View Article: PubMed Central - PubMed

Affiliation: School of Engineering & Applied Sciences, ISRA University, Islamabad 44000, Pakistan.

ABSTRACT
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 s from their original positions, and diminishing of depth. The required 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 s at their original positions. Fitness function is used to minimize the error between the desired and estimated beam patterns along with constraints. Simulation results for various scenarios have been given to exhibit the validity and performance of the proposed algorithm.

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The original radiation pattern, the w4 SSF, and recovery of three s.
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fig13: The original radiation pattern, the w4 SSF, and recovery of three s.

Mentions: Case b. In this case, we discuss the failure of w4 sensor. If the sensor w4 fails due to any reason, the whole radiation pattern became damage. After optimization, the SLL reduces and s are steered back to their original positions as shown in Figure 12. Then to create symmetry we also force w−4 equal to zero, to achieve the required depth level. The advantage of symmetry sensor failure is to get deeper depth level. The number of s achieved in 7th symmetry sensor failure is six, and in case of 4th symmetry sensor failure the number of s received are three. From the simulation results, it is clear that the number of s reduces by one as the sensors get damage near the centre sensor. After optimization by CADE, the SLL reduces and s are steered back to their previous positions at angles θ1 = 34.89°, θ2 = 54.31°, and θ3 = 68.9° as shown in Figure 13. The depth level for single and SEF is given in Table 7.


Correction of faulty sensors in phased array radars using symmetrical sensor failure technique and cultural algorithm with differential evolution.

Khan SU, Qureshi IM, Zaman F, Shoaib B, Naveed A, Basit A - ScientificWorldJournal (2014)

The original radiation pattern, the w4 SSF, and recovery of three s.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3926342&req=5

fig13: The original radiation pattern, the w4 SSF, and recovery of three s.
Mentions: Case b. In this case, we discuss the failure of w4 sensor. If the sensor w4 fails due to any reason, the whole radiation pattern became damage. After optimization, the SLL reduces and s are steered back to their original positions as shown in Figure 12. Then to create symmetry we also force w−4 equal to zero, to achieve the required depth level. The advantage of symmetry sensor failure is to get deeper depth level. The number of s achieved in 7th symmetry sensor failure is six, and in case of 4th symmetry sensor failure the number of s received are three. From the simulation results, it is clear that the number of s reduces by one as the sensors get damage near the centre sensor. After optimization by CADE, the SLL reduces and s are steered back to their previous positions at angles θ1 = 34.89°, θ2 = 54.31°, and θ3 = 68.9° as shown in Figure 13. The depth level for single and SEF is given in Table 7.

Bottom Line: Three issues regarding sensor failure at any position in the antenna array are discussed.We assume that sensor position is known.Fitness function is used to minimize the error between the desired and estimated beam patterns along with constraints.

View Article: PubMed Central - PubMed

Affiliation: School of Engineering & Applied Sciences, ISRA University, Islamabad 44000, Pakistan.

ABSTRACT
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 s from their original positions, and diminishing of depth. The required 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 s at their original positions. Fitness function is used to minimize the error between the desired and estimated beam patterns along with constraints. Simulation results for various scenarios have been given to exhibit the validity and performance of the proposed algorithm.

Show MeSH
Related in: MedlinePlus