FPGA (field programmable gate array) based DOA (direction of arrival) estimation fast-implementing method
An implementation method and fast technology, applied in directions such as directional finder, direction finder using radio waves, radio wave direction/bias determination system, etc., which can solve the problem of inability to realize online real-time processing, deterioration of DOA estimation performance, large calculation Complexity and other issues, to achieve the effect of stable performance, simple thinking, and strong portability
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[0026] Below in conjunction with accompanying drawing, the present invention is described in further detail.
[0027] The purpose of the present invention is to provide a fast realization method of DOA estimation based on FPGA. The basic principle of FPGA-based DOA estimation fast implementation method is: based on virtual array expansion to construct a centrosymmetric array, map the algorithm processing process from the complex number domain to the real number domain through preprocessing unitary transformation, and complete the covariance matrix calculation and feature analysis in the FPGA. In the process of value decomposition, one-dimensional spatial spectrum search with threshold constraints is used, combined with large-step coarse search and quantized fine search, to achieve high-precision estimation and fast response of DOA at the same time. figure 1 It is a flowchart of the method of the present invention, specifically comprising the following steps:
[0028] Step 1. ...
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