Method for MIMO radar system angle estimation based on fast Fourier transformation

Abstract

The invention discloses a method for MIMO radar system angle estimation based on fast Fourier transformation. The method for MIMO radar system angle estimation based on fast Fourier transformation comprises the steps that a data matrix received by a first pulse of the radar system is evenly divided and divided signals are expressed as new signals defined according to the four matrix blocks; according to H (1), bi-dimensional fast Fourier transformation is respectively conducted; coherent integration is conducted on F11 (1), F12 (1), F21 (1) and F22 (1), a peak point and the corresponding subscript ix and the corresponding subscript iy are recorded, points corresponding to the subscript ix and the subscript iy are respectively obtained from the F11 (1), the F12 (1), the F21 (1) and the F22 (1), so that the vector of f (1) belonging to C4*1 is established; the covariance matrix of the f (1) is calculated according to the sampling covariance matrix inversion principle, characteristic decomposition is conducted on the covariance matrix, and a noise projection matrix pn can be obtained through a noise sub space un; a transmitting oriented vector and a receiving oriented vector br (theta) are obtained according to a receiving data matrix Y(1) and the leaving angle and the reaching angle are estimated through the MUSIC arithmetic.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and relates to a multiple-input multiple-output (MIMO) radar system, specifically a fast Fourier transform-based bistatic multiple-input multiple-output (MIMO) radar system angle estimation method, which can be used in large Under the condition of a large number of snapshots in the array, the computational complexity can be effectively reduced, and accurate estimation of the target angle can be realized. Background technique [0002] As a kind of all-weather and all-weather detection equipment, radar has been successfully applied in ground-based, airborne and space-borne, and is playing an increasingly significant and important role in military and civilian applications. Early radars used mechanically scanned parabolic antennas, which were single-channel for both transmission and reception, and there were no degrees of freedom available in space. The phased array radar technology was p...

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Problems solved by technology

However, since these methods involve covariance matrix estimation and eigendecomposition of full-dimensional received data, iterative optimization, angle search, etc., the process is complex and the amount of calculation is large, especially in the case of a large number of array elements and a large number of snapshots , the increase in computational complexity is significant, and the direct impact is that the realizability of the actual project is reduced

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