A new 2-D DOA estimation method based on coprime array MIMO radar

Aiming at the problem that traditional Direction of Arrival (DOA) estimation methods cannot handle multi-source with high accuracy while increasing the degree of freedom, proposing a new two-dimensional DOA estimation method based on coprime array MIMO radar (SM-MIMO-CA). Firstly, to ensure the accuracy of multi-source estimation under the finite number of array elements, proposing a new array model based on coprime array MIMO radar (MIMO-CA). Array model uses a special combination of irregular transmitting array and uniform linear array receiving array. Besides, to decrease the complexity and raise the accuracy of two-dimensional DOA estimation, proposing a new DOA estimation method based on coprime array MIMO radar. This method uses the sparse array topology of virtual array elements to analyze a larger number of sources, and combines the compressed sensing method to process the sparse array. This method obtains a larger array aperture with a smaller number of elements, and improves the resolution of the azimuth angle, so the DOA estimation accuracy is improved and the complexity is reduced. Finally, experiments are verified the effectiveness and reliability of the SM-MIMO-CA in improving the degree of freedom of the array, decreasing the complexity, and enhancing the accuracy of DOA.