Sparse array configuration design method with low redundancy rate

Abstract

The invention relates to a sparse array configuration design method with a low redundancy rate. The method comprises the following steps: (1) determining the array element number and array element spacing of two-stage sparse sub-arrays; (2) designing a sparse array configuration and deducing an analytical expression of array element position distribution; (3) deriving continuous intervals of the sparse array in the differential common-array domain, the summation common-array domain and the summation differential common-array domain; (4) calculating the continuous degree of freedom of the summation difference virtual array based on the continuous interval in the step (3); (5) deriving an expression of the overlapping degree of the summation common array and the difference common array; and (6) calculating the common-array redundancy rate of the sparse array configuration. According to the method, the array element overlapping rate between the summation virtual array and the difference virtual array is reduced, the problem that the common array redundancy is too high in an existing similar array design method is solved, under the condition of the same array element number, the higher array utilization rate and the higher degree of freedom are achieved, and the angle estimation performance is improved from the design level.

Description

technical field [0001] The invention belongs to the field of array antenna design, and in particular relates to a sparse array configuration design method with low redundancy rate. Background technique [0002] Sparse array refers to the array configuration formed by sparsely arranging the array elements in the antenna receiving array according to certain rules. Compared with the traditional uniform array, the sparse array breaks through the limitation of the space Nyquist sampling theorem, and has the Many advantages, such as aperture expansion, increased degree of freedom, and reduced mutual coupling effect between array elements, help to improve angle measurement performance from the array design level. [0003] The configuration design of sparse array can be mainly divided into differential co-array type and sum differential co-array type. Differential co-array representative arrays include: minimum redundant array, minimum hole array, coprime array, nested array and de...

Images