Dual parallel antenna array-based coherent distributed non-circular signal DOA estimation method

Abstract

The invention relates to a dual parallel antenna array-based coherent distributed non-circular signal DOA estimation method, which belongs to the field of array signal processing. The two-dimensionalDOA estimation method for coherent distributed non-circular signals comprises steps: an array output matrix is calculated by using two parallel uniform linear arrays; by using the non-circular characteristics of a source, an extended output matrix is constructed; four selection matrices are set, and an extended steering vector array has rotational invariance; the covariance matrix of an extended array output matrix is calculated; the covariance matrix is subjected to eigenvalue decomposition to obtain signal subspace; an equivalent matrix is calculated, the equivalent matrix is subjected to eigenvalue decomposition respectively, eigenvalues are paired, and estimation on an azimuth angle and a pitch angle are realized. By using the non-circular characteristic of the signal, the number of array elements is extended virtually, and the estimation performance is improved.

Description

technical field [0001] The invention relates to a method for estimating DOA of a coherent distributed noncircular signal based on a double-parallel antenna array, belonging to the field of array signal processing. Background technique [0002] In the field of array signal processing, many classical DOA estimation algorithms assume that the target source is a point source, that is, the energy of the source is concentrated at a discrete angle. However, in the field of practical applications such as low-angle tracking radar, sonar imaging, ionospheric radio propagation, and mobile communication positioning, the scattering of the target signal makes the energy of the source reach the receiving end in a continuous direction within a certain range, which leads to signal loss. The angular spread of the source energy, at this time the target source cannot simply be considered as a point source, but a parameterized distributed source model needs to be established. The parameter esti...

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Problems solved by technology

A two-dimensional coherent distributed source requires four parameters to describe, namely, azimuth and elevation, and the angular spread of the two (ie, angular deviation), so the parameter estimation becomes more complicated

Literature [L.Wan, G.Han, J.Jiang, and J.Jiang, "DOA estimation for coherently distributed sources considering circular and noncircular signal in massive MIMO systems," IEEESystems Journal, vol.11, no.1, pp.41 -59,Jul.2017.] Aiming at coherent distributed sources, a DSPE algorithm based on the mixed incidence of non-circular and circular signals is proposed, and the estimation performance has been improved. However, this method uses two-dimensional spectral peak search, and the amount of calculation is too large

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