An Amplitude and Phase Error Correction Method for Airborne Bistatic Mimo Radar Based on Single Range Gate

Abstract

The invention discloses a method for correcting amplitude and phase errors of an airborne bistatic MIMO radar based on a single range gate. The echo data is corrected; according to the airborne bistatic MIMO radar model, the elevation angle and azimuth angle of all clutter scattering points in a single range gate relative to the transmitter and receiver are calculated, and the spatial distribution of all clutter scattering points is calculated by using the angle information. When the three-dimensional steering vector is used, the projection matrix of the orthogonal complement space of the clutter subspace is calculated after the steering vector is orthogonalized; the projection matrix is ​​multiplied by the corrected data by using the properties of the projection matrix to find the least square norm, and use The first array element of the virtual array element is used as the reference array element to construct the constraint condition, and the error correction matrix is ​​calculated by using the constraint condition. Compared with the traditional method, the calculation accuracy of the method of the invention is higher, and the stability in the 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

Images