High-order cumulant based bistatic MIMO (Multiple Input Multiple Output) radar parameter estimation method

Abstract

The invention discloses a high-order cumulant based bistatic MIMO (Multiple Input Multiple Output) radar parameter estimation method. A joint estimation method of DOD (Direction of Departure), DOA (Direction of Arrival) and Doppler frequency of targets under a gauss color noise background is given out according to bistatic MIMO radar echo signal characteristics through a characteristic that high-order cumulant is insensitive to gauss color noise. The high-order cumulant based bistatic MIMO radar parameter estimation method comprises constructing two opposite angle section matrixes of cross-fourth-order cumulant of output signals of adjacent matched filters through airspace and time domain information of the bistatic MIMO radar; decomposing a singular value of the opposite angle section matrixes of the four-order cumulant, estimating the number of targets, reducing dimensions through eigenvalues and eigenvectors and constructing a new matrix; obtaining joint estimation of the Doppler frequency, the DOD and the DOA of the targets through the eigenvalues and eigenvectors of the novel matrix. According to the high-order cumulant based bistatic MIMO radar parameter estimation method which is an effective bistatic MIMO radar parameter estimation method, a target parameter estimation process has no specific requirements for the number of transmission array elements and receiving array elements.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to the application of a bistatic multiple-input multiple-output radar system, and aims to provide a method for estimating the angle and velocity of a fast target for a bistatic multiple-input multiple-output radar working in a Gaussian colored noise environment. Compared with some methods, the influence of Gaussian color noise on the estimation accuracy of target parameters is overcome, and there is no special requirement for the array structure of the radar. Background technique [0002] Combining the advantages of Multiple-Input Multiple-Output (MIMO, Multiple-Input Multiple-Output) technology and the anti-stealth effect of bistatic radar, the transmitting and receiving arrays of bistatic MIMO radar are all centralized arrays, and the baseline between the transmitting and receiving arrays is long. Its transmitting array simultaneously transmits a set of orthogonal waveforms, and the...

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Problems solved by technology

[0004] When the actual noise model does not satisfy white noise, the performance of the above bistatic MIMO radar target parameter estimation algorithm will deteriorate

Fu Weibo (Fu Weibo. Research on MIMO Radar Parameter Estimation Technology [D]. Xidian University. 2012) proposed to use the cross-correlation of matched filter output at different times to eliminate spatial color noise, and gave a dual Joint estimation method of bistatic MIMO radar angle and Doppler frequency; however, the second-order statistics cannot fully describe the characteristics of bistatic MIMO radar signals, and the algorithm is only applicable to the case where the time domain noise is Gaussian white noise

Li Bingyin (Li Bingyin. Estimation of MIMO radar target parameters based on high-order cumulant algorithm [D]. Changchun University of Science and Technology. 2014) used fourth-order cumulant processing combined with two-way spatial smoothing technology and MUSIC algorithm to estimate the orientation of MMO radar targets, and proved that in The performance of the algorithm based on the fourth-order cumulant matrix in the background of Gaussian color noise is better than the algorithm based on the covariance matrix;

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