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Mono-static MIMO radar distribution type target angle estimation method based on fourth-order cumulant

A fourth-order cumulant and target angle technology, applied in the field of distributed target angle estimation, can solve the problems of performance degradation, inability to estimate the expansion angle of distributed targets, and inability to suppress Gaussian color noise, etc.

Active Publication Date: 2014-07-16
HARBIN ENG UNIV
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Problems solved by technology

However, this method is based on the assumption of Gaussian white noise and cannot suppress Gaussian color noise. Therefore, in the case of Gaussian color noise, the performance of the method will drop sharply, and the algorithm cannot estimate the distribution of the distributed target. expansion angle

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  • Mono-static MIMO radar distribution type target angle estimation method based on fourth-order cumulant
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  • Mono-static MIMO radar distribution type target angle estimation method based on fourth-order cumulant

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Embodiment Construction

[0083] The present invention will be described in more detail below in conjunction with the structural block diagram

[0084] Step 1. MIMO radar distributed target receiving signal

[0085] Assume that the monostatic MIMO radar has M antenna array elements with co-located transceivers, the array element spacing is d, and each transmitting array element transmits mutually orthogonal phase-encoded signals. (φ i ,σ i ) respectively represent the direction of arrival and spread angle of the i-th target relative to the center of the transmitting array element. Then the echo signal of the qth transmit pulse repetition period received by the receiving array element can be expressed as:

[0086]

[0087] where α pq is the radar cross-section emission coefficient of the p-th target at the q-th transmit pulse repetition period, is the receiving steering vector, λ is the wavelength of the carrier, is the distributed target deterministic signal distribution function, s(t) is th...

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Abstract

The invention provides a mono-static MIMO radar distribution type target angle estimation method based on a fourth-order cumulant. M transmit-receive antenna arrays are provided, a transmitting end transmits mutually orthogonal phase-coded signals, and a receiving end receives mutually orthogonal phase-coded signals. A matching filter of each receiving array of the receiving end carries out matching filtering on the received orthogonal signals and then carries out separation, and a distribution type target receive signal matrix is obtained. A fourth-order cumulant matrix of the receive signals is calculated by using the distribution type target receive signal matrix. Eigenvalue decomposition is carried out on the fourth-order cumulant matrix, a mutually orthogonal signal subspace and a noise subspace are obtained, and a spatial spectrum function is constructed by using a multi-signal classification algorithm. The distribution type target angle is calculated through a two-dimensional spectral peak searching method. Even when in a colored-noise environment, the mono-static MIMO radar distribution type target angle estimation method based on the fourth-order cumulan still has high estimation accuracy for a central direction-of-arrival angle, can estimate an expansion angle of a distribution type target, and achieves automatic matching between the direction-of-arrival angle and the expansion angle.

Description

technical field [0001] The invention relates to a radar signal processing method, in particular to a distributed target angle estimation method of a monostatic multiple-input multiple-output MIMO radar system. Background technique [0002] Influenced by the successful application of multiple-input multiple-output (MIMO) technology in the field of communication, a new radar system with high parameter estimation accuracy and strong survivability is proposed. Compared with traditional radar, MIMO radar uses multiple transmit channels to transmit mutually orthogonal coded signals, and uses multiple receive channels to perform matched filtering processing, so it has the ability to obtain information from multiple channels, and at the same time generates virtual array elements, greatly The array aperture is expanded, so that the MIMO radar has high target detection performance. In addition, since the MIMO radar array antenna can be flexibly arranged according to the system requir...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/02G01S7/41
Inventor 王伟王犇刘琦李欣黄平王冠男司佳希马跃华王慧
Owner HARBIN ENG UNIV
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