Direction of arrival (DOA) estimation method of virtual two-order array extension
A technology for estimation of direction of arrival and direction of arrival, applied in radio wave direction/deviation determination systems, direction finders for direction determination, direction finders using radio waves, etc., can solve the problem that the number of estimated sources is not resolved question
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[0037] In this embodiment, the number of array elements is M=2, and the uniform linear antenna array with array element spacing d=λ / 2 (λ is the signal wavelength) is taken as an example, and only two incoherent narrowband signal far-field scenarios are considered, and then the center frequency f c =70MHz, the number of independent experiments is N MC =50.
[0038] Step 1: Set the corresponding parameters according to the received signal and the structure of the antenna itself, and use the second-order Volterra filter structure to construct y(t);
[0039] Step 1-1: Without loss of generality, assume that the number of elements of the uniform linear array is M=2, the number of signal sources is P=2, and the signal incident angles are θ 1 =30°,θ 2 =33°, the array received signal can be expressed as:
[0040] x(t)=As(t)+n(t)
[0041] where x(t)=[x 1 (t),x 2 (t),...,x M (t)] T ,x m (t), m=1,...M represents the signal received by the mth array element. A=[a(θ 1 ), a(θ 2...
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