Distributed target angle estimation method for monostatic mimo radar based on fourth-order cumulants
A fourth-order cumulant and target angle technology, applied in the field of distributed target angle estimation, can solve the problems of inability to estimate the distributed target expansion angle, performance degradation, and inability to suppress Gaussian color noise, etc.
Active Publication Date: 2017-02-22
HARBIN ENG UNIV
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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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[0083] The present invention will be described in more detail below in conjunction with structural block diagram
[0084] Step 1, MIMO radar distributed target receiving signal
[0085] It is assumed that the single-static MIMO radar has M antenna elements with co-location of transmitting and receiving, and the distance between the elements is d, and each transmitting element transmits mutually orthogonal phase-encoded signals. (φ i ,σ i ) represent the center direction of arrival and spread angle of the i-th target relative to the transmitting array element, respectively. Then the echo signal of the qth transmit pulse repetition period received by the receiving element can be expressed as:
[0086]
[0087] where α pq is the radar cross-section transmission coefficient of the p-th target at the q-th transmission pulse repetition period, is the receiving steering vector, λ is the wavelength of the carrier, is the distributed target deterministic signal distribution ...
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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 single-base multiple-input multiple-output MIMO radar system. Background technique [0002] Affected by the successful application of multiple-input multiple-output (MIMO) technology in the field of communication, a new system radar with high parameter estimation accuracy and strong survivability is proposed. Compared with traditional radar, MIMO radar uses multiple transmitting channels to transmit mutually orthogonal coded signals, and uses multiple receiving channels for matched filtering processing, so it has the ability to obtain information from multiple channels, and at the same time generates virtual array elements, which greatly improves the The array aperture is expanded, so that the MIMO radar has high target detection performance. In addition, because the MIMO radar array antenna can be flexibly arranged according t...
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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