Estimating method of direction of arrival of bistatic MIMO (Multi-Input Multi-Output) radar based on circular array

Abstract

The invention discloses an estimating method of direction of arrival of a bistatic MIMO (Multi-Input Multi-Output) radar based on a circular array, and mainly solves the problems that in the prior art, calculation is large and the direction of arrival of the circular array cannot be estimated. The realizing process comprises the steps of: 1, obtaining a cut-off Fourier coefficient of a steering vector of the array, and replacing the steering vector by the product of the Fourier coefficient and a base; 2, performing matched filtering for received data by the array to form an autocorrelation matrix and performing characteristic-decomposition for the matrix; 3, selecting a characteristic vector to form a noise sub space and obtaining a spatial zero-spectral function; 4, introducing the steering vector received to the spatial zero-spectral function, and solving an acceptance angle by polynomial rooting; and 5, introducing the acceptance angle received to the spatial zero-spectral function and solving an angle of departure by polynomial rooting. According to the estimating method of direction of arrival of the bistatic MIMO radar based on the circular array, the polynomial rooting method can be adopted to estimate the direction of arrival of the manifold MIMO radar of the circular array, spectrum peak search is avoided, calculation is low, and the estimating method of direction of arrival of the bistatic MIMO radar based on the circular array can be applied to estimating the direction of arrival of the bistatic MIMO radar.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to the estimation of the direction of arrival of the bistatic multi-input multi-output MIMO radar, which can be used for the estimation of the direction of arrival of the MIMO radar, reduces the amount of computation, and is easy for engineering realization. Background technique [0002] Multiple-input multiple-output MIMO radar can make full use of waveform diversity gain, increase the degree of freedom of the system, improve its spatial resolution, improve the accuracy of parameter estimation and increase the maximum number of targets that can be located by the system. In various array manifolds, the uniform linear array has a simple structure, is easy to realize, and can adopt various fast direction of arrival estimation DOA algorithms, so it has become the basis of many theoretical studies. However, the one-dimensional uniform linear array can only provide 180-degree u...

AI Technical Summary

Problems solved by technology

[0003] The target angle super-resolution estimation method is an important content of MIMO radar signal processing. At present, the most basic DOA estimation method is the multi-signal classification MUSIC method. Airspace search, the amount of calculation is very large

In order to reduce the amount of computation, the ESPRIT method for estimating signal parameters using the rotation invariant technique and the multi-signal classification root-MUSIC method for multinomial root finding can be used. Can only be used for uniform linear arrays, but not for circular arrays

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