Angle estimation method of real-valued esprit non-circular signal for monostatic mimo radar

Abstract

The invention belongs to the technical field of radar, and discloses a single-base MIMO radar real-value ESPRIT non-circular signal angle estimation method, which performs matching filtering on the received data of the array element and the transmitted signal to obtain the observed data vector; performs dimensionality reduction and prediction on the observed data. Processing to obtain the received data vector in low-dimensional space; use the non-circular characteristics of the signal and Euler's formula to construct a real-valued received data vector that doubles the array aperture; construct the rotation invariant relationship of the virtual array with aperture expansion; calculate the covariance matrix of the extended received data , decompose its eigenvalues, and estimate the real-valued signal subspace; define a new real-valued signal subspace, and solve the rotation invariant equation of the new real-valued signal subspace; calculate the estimated value of DOA of the target. The invention can greatly reduce the calculation complexity of the ESPRIT algorithm while significantly improving the DOA estimation precision, and is suitable for occasions with low signal-to-noise ratio and low number of snapshots.

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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