Uniform circular array-based DOA estimation and mutual coupling correction method

Abstract

The present invention provides a uniform circular array-based DOA estimation and mutual coupling correction method. According to analysis and derivation, an actual steering vector of a uniform circular array in a mode space domain can be equivalently regarded as a steering vector of a virtual uniform linear array with channel amplitude and phase disturbance, which means that the problem of correcting the mutual coupling of the uniform circular array can be transformed into the correction of the channel amplitude and phase disturbance of the virtual uniform linear array: the amplitude disturbance is obtained according to the main diagonal of the covariance matrix of the data received by the virtual uniform linear array, and the phase disturbance is obtained according to the characteristic that the covariance matrix of the data received by the uniform linear array without amplitude and phase disturbance has a Toeplitz structure. According to the uniform circular array-based DOA estimation and mutual coupling correction method provided by the present invention, the problem of fuzzy estimation in phase disturbance estimation is solved, online work can be supported, the method has an analytic solution and no multi-dimensional parameter search, and the problem of false DOA estimation that appears in the RARE theory can be avoided.

Description

technical field [0001] The invention relates to the technical field of array signal processing and spatial spectrum estimation, in particular to a DOA estimation and mutual coupling correction method based on a uniform circular array. Background technique [0002] Source localization has become a research hotspot in the field of wireless communication. Uniform circular array, as a common array structure, plays an important role in this field because of its equal positioning resolution accuracy in 360° azimuth. In practical engineering applications, there are various errors in the steering vector of the array used, such as position error, amplitude and phase disturbance, and array element mutual coupling, etc. These errors will reduce the performance of the classical DOA estimation method, so these types of errors need to be corrected . [0003] At present, the DOA estimation and array element mutual coupling correction methods for uniform circular arrays can be divided int...

AI Technical Summary

Problems solved by technology

The iterative method regards the mutual coupling coefficient and DOA as the parameters to be measured at the same time and performs alternate iterations. This type of algorithm can avoid the pseudo-DOA estimation problem in the RARE theory, but it has no analytical solution, a large amount of calculation, and it is easy to fall into a local optimal solution. middle

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