Actual-value ESPRIT non-circular signal angle estimation method for single-base MIMO radar

Abstract

The invention, which belongs to the field of radar technology, discloses an actual-value ESPRIT non-circular signal angle estimation method for a single-base MIMO radar. Matched filtering is carried out on array element receiving data and a transmitted signal to obtain an observation data vector; dimensionality reduction preprocessing is carried out on the observation data to obtain a low-dimensional space receiving data vector; on the basis of a non-circular characteristic of the signal and an Euler formula, an actual-value receiving data vector with array aperture doubling is constructed; arotation invariance relationship of a virtual array with aperture extending is constructed; a covariance matrix of the extended receiving data is calculated and feature value decomposition is carriedout on the matrix, an actual-value signal sub space is estimated; new actual-value signal sub space is defined and a rotation invariance equation of the new actual-value signal sub space is calculated; and a DOA estimation value of the target is calculated. Therefore, the DOA estimation accuracy is improved obviously and the computational complexity of the ESPRIT algorithm is reduced substantially. The estimation method is suitable for the low-signal-to-noise-ratio and low-fast-beat-number occasions.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a method for estimating the angle of a single-base MIMO radar real-value ESPRIT non-circular signal. Background technique [0002] At present, the commonly used existing technologies in the industry are as follows: multiple input multiple output (MIMO) radar is a new radar system developed based on MIMO communication technology. Using the idea of ​​waveform diversity, MIMO radar uses multiple transmitting antennas to simultaneously transmit mutually orthogonal waveforms, and simultaneously uses multiple receiving antennas to receive target reflected signals. Compared with traditional phased array radar, MIMO radar has higher angular resolution and more degrees of freedom, and has better angle estimation performance. Direction of arrival (DOA) estimation is an important research content of MIMO radar parameter estimation. Rotation-invariant subspace technique (Estimate signal par...

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Problems solved by technology

[0004] (1) Most of the existing ESPRIT algorithms do not make full use of the non-circular characteristics of the transmitted signal. Under the conditions of low signal-to-noise ratio and low number of snapshots, the inaccurate estimation of the subspace will lead to low precision or even failure of angle estimation; (2) In order to take advantage of the non-circular characteristics of the transmitted signal, the existing ESPRIT algorithm usually directly constructs a virtual array with doubled aperture to improve the target angle estimation accuracy, which will inevitably lead to a sharp increase in the computational complexity of the algorithm, which is not conducive to the real-time implementation of the algorithm

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