5 results about "Coprime array" patented technology

The application discloses a two-dimensional coherent signal DOA estimation method based on double parallel relatively prime array movement, which comprises the following steps: a double parallel array comprises a first subarray and a second subarray, phase compensation is performed on the output of the first subarray and the output of the second subarray to obtain first subarray compensation output and second subarray compensation output; a first vector is obtained based on the first subarray compensation output and the second subarray compensation output, and a second vector is obtained based on the first subarray compensation output; a sparse off-grid optimization function is constructed; accurate angle estimation of an incident signal and an X axis is obtained based on the sparse off-grid optimization function; angle estimation of the incident signal and a Y axis is obtained based on the first vector and the second vector; and angle estimation value of the two-dimensional coherent signal is obtained based on the accurate angle estimation of the incident signal and the X axis and the angle estimation of the incident signal and the Y axis. The application uses the double parallel relatively prime array to perform angle estimation of the two-dimensional coherent signal, and makes up for the deficiency of the relatively prime array in angle estimation of a coherent source.

This invention discloses a design method for a Type I ternary coprime array based on coprime sparse arrangement, relating to the field of array structure design. Two coprime positive integers M and N are selected to construct the basic structure of a prototype coprime array. A subarray with n elements and n spacing is added in reverse to the prototype coprime array to form a Type I ternary coprime array. Based on the distribution law of holes in the prototype coprime array, the lower bound expression of the optimal parameters of the subarray can be obtained, ensuring that the holes in the prototype coprime array are completely filled. Analytical expressions for the distinct and continuous degrees of freedom of the Type I ternary coprime array are derived. The method is scalable, allowing for the expansion of array degrees of freedom without destroying the prototype coprime array structure by adding array elements in reverse. The Type I ternary coprime array designed using this method exhibits weak mutual coupling, scalability, and high distinct degrees of freedom.

This invention provides an improved coprime array structure, an improved DOA estimation method for coprime arrays, a computer, and a storage medium, relating to the field of array signal processing. It solves the problems of insufficient continuous virtual array portions, low continuous degrees of freedom, and insufficient array aperture in existing array structures. The invention provides the following scheme: an improved coprime array structure comprising three subarrays, namely subarray 1, subarray 2, and subarray 3. The elements in subarray 1 and subarray 2 are arranged alternately. The first element of subarray 3 is Nd away from the last element of subarray 2. Subarray 3 is considered to be formed by shifting subarray 1 to the right by (MN+N-M)d units. Subarray 3 is superimposed with subarrays 1 and 2 to obtain the improved coprime array structure. An improved DOA estimation method for coprime arrays is also provided, implemented using the aforementioned improved coprime array structure, and is suitable for array signal processing experiments.

This invention discloses a low-redundancy coprime array structure design method based on subarray shifting and filling strategies, belonging to the field of array signal processing technology. The method includes: selecting coprime integers M and N to construct an extended coprime array; removing redundant array elements from the first subarray while maintaining the continuous degrees of freedom of the differential virtual array; removing the array element at the origin position from the second subarray and shifting another array element to fill part of the virtual holes; further filling the remaining holes by adding two physical array elements to obtain the final low-redundancy shifted coprime array; and finally using the spatial smoothing MUSIC algorithm for direction-of-arrival estimation. This invention, without changing the number of physical array elements, effectively expands the continuous degrees of freedom and array aperture of the differential virtual array through subarray reconstruction and shifting filling, reduces the mutual coupling effect between array elements, and significantly improves the accuracy and robustness of direction-of-arrival estimation, especially suitable for multi-source underdetermined direction-finding scenarios in complex environments.