Grating Lobe Suppression of Airborne Distributed Array Based on Improved Differential Evolution Algorithm
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Abstract
Nowadays, distributed antenna array has been widely used due to its high gain and well flexibility of array configuration. Distributed array can be arranged flexibly on the airframe, improving the gain and space resolution of array system. The existing research on distributed array mainly aims on array with large inter-space between units or array with multi-subarray dispersed arranged, but little research focuses on two-subarray distributed array applied on aeroplane. Since the problem of dense grating lobe brought by array distributing, a optimization method based on Differential Evolution Algorithm is presented to suppress grating lobe of distributed array. The method presented can effectively lower the grating lobe level of two-subarray distributed array satisfying the constraints. Meanwhile, the sidelobe level (SLL) can be controlled at low level. In the condition of certain space between two sub-array, the maximum sidelobe level (MSLL) of array can be lowered to -10 dB. By using Monte-Carlo test, the feasibility of method is verified.
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