Generation of Difference Patterns from Thinned Arrays using Genetic Algorithm

摘要

In tracking radar systems, it is essential to locate the target with high accuracy. When the target is placed exactly in the null between the two principal lobes of a difference pattern, its angular location can be determined with high accuracy. The general way of obtaining a difference pattern is to excite the array with a bi phasal distribution where one half of the distribution is in phase while the other half is out of phase. Array thinning can be used to generate low side lobe difference patterns for tracking applications. In the present work thinning of linear arrays for generating low side lobe difference patterns using Genetic algorithm was carried out. From the simulation results we found that optimized patterns are characterized by lowest possible side lobes with a deep null in the bore sight direction. These types of patterns are useful for array designers for angular tracking RADAR and point to point communication applications with reduced EMI.