A new virtual interpolation technology with range as object

Virtual interpolation technology can be applied to direction-of-arrival (DOA) estimation as a preprocessing technique to achieve the DOA estimation for any array. In order to solve the angle-sensitive problem in virtual interpolation technology, a range interpolation transformation method is proposed. Taking the range of the angle function as the interpolating object, and modifying the interpolating step according to the mapping between the angle and the range, a high-performance interpolating method with less computation is realized. For large region virtual interpolation, on the other hand, based on multi-region interpolation technology, the region is divided into multiple nested regions to achieve high-performance transformation results and can be used to improve the interpolation accuracy in the process of range interpolation technology. The simulation results show that the range interpolation transform method has obvious advantages over the classical transform method in both transformation error and DOA estimation performance, and the angle-sensitive problem is effectively alleviated. The nested virtual interpolation can be used to achieve high-performance virtual interpolation and improve the accuracy of interpolation in large regions.