A Two-Dimensional DOA Estimation Method for Coherent Signals Based on Hexagonal Array
A coherent signal, hexagonal technology, used in direction finders using radio waves, radio wave direction/bias determination systems, etc. The effect of improving performance
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[0019] The working process of this invention will be further described in detail below in conjunction with the accompanying drawings. The decoherent 2D DOA estimation process can be divided into three parts.
[0020] The first part is mainly for the hexagonal array receiving data modeling, conjugate virtual extended array, divided into sub-array forms according to the array structure, mainly steps 1 and 2.
[0021] Suppose there are D(D≤N) far-field narrowband signal sources incident on the attached figure 2 On the hexagonal planar array shown, the number of array elements is N, the array element spacing is r, and the elevation angle and azimuth angle of the incident signal are respectively The noise output by the array is additive white Gaussian noise with zero mean and variance σ 2 , and is independent of the source signal.
[0022] Taking the hexagonal array with the least number of array elements as an example, the output data model of the array is studied.
[0023] ...
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