Airborne bistatic MIMO radar amplitude-phase error correcting method based on single-distance gate

Abstract

The invention discloses an airborne bistatic MIMO radar amplitude-phase error correcting method based on a single-distance gate; the method comprises the following steps that a receiver receives datawith the array element amplitude phase error in a distance gate, and echo data is corrected through a to-be-solved error correction matrix; the pitching angle and the azimuth angle of all clutter scattering points in a single distance gate relative to a transmitter and the receiver are calculated according to an airborne bistatic MIMO radar model, space-time three-dimensional guide vectors of allclutter scattering points are calculated by using angle information, orthogonal processing is carried out on the guide vectors, and then the projection matrix of the orthogonal complementary space ofthe clutter subspace is calculated; and the projection matrix is multiplied by the corrected data by utilizing the property of the projection matrix, and the minimum two-norm is solved, a constraint condition is constructed by using a first array element of the virtual array element as a reference array element, and an error correction matrix is obtained by utilizing constraint conditions. Compared with a traditional method, the method disclosed by the invention has the advantages that the calculation precision is higher, and the stability in a non-uniform clutter environment is increased.

Description

technical field [0001] The invention belongs to the technical field of amplitude and phase error correction of radar transceiver arrays, and in particular relates to an airborne bistatic MIMO radar amplitude and phase error correction method based on a single range gate. Background technique [0002] Multiple-Input Multiple-Output (MIMO) radars are equipped with multiple array elements at the transmitting end and receiving end respectively. All transmitting array elements transmit mutually orthogonal signals at the same time, and the receiving array elements utilize the orthogonality of the transmitting signals. In this way, a virtual array is formed to improve the accuracy of parameter estimation. The separate working mode of the airborne bistatic radar transmitter and receiver has many advantages, such as targeted detection of stealth targets, low-altitude moving targets, and jamming targets, and the receiver can move covertly on the battlefield according to requirements. ...

AI Technical Summary

Problems solved by technology

However, the final correction matrix obtained by the algorithm needs to use the clutter plus noise covariance matrix and the projection matrix, and the calculation accuracy of the covariance matrix and the projection matrix will affect the final correction result. The clutter plus noise covariance matrix is ​​obtained from the training samples It is estimated that the size of the training samples is closely related to the final correction effect. When the number of training samples is small, the correction accuracy is reduced; the calculation of the projection matrix also needs to use echo data, so the calculation accuracy of the projection matrix Also affected by echo data

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