Airborne radar clutter suppression method based on launch space-time weight optimization and ka-stap

Abstract

The invention belongs to the field of airborne array radar clutter suppression, and provides an airborne radar clutter suppression method based on emission space-time weight optimization and KA-STAP; According to the array structure and clutter prior information, the transmit space-time weight vector is designed to suppress the main lobe and side lobe clutter, and the relatively complete clutter information estimation prior covariance matrix is ​​retained while reducing the peak energy of the receive clutter. Finally, by loading the estimated covariance matrix with the constructed prior covariance matrix, the space-time optimal weight of the receiving STAP filter is calculated. Compared with the "conventional launch + KA‑STAP" method, the present invention introduces the launch degree of freedom, reduces the clutter peak energy in the echo, and greatly reduces the dynamic range of the received signal; "Compared with the method, certain clutter information is retained in the echo, which is beneficial to suppress clutter more effectively through KA‑STAP at the receiving end.

Description

technical field [0001] The invention belongs to the field of airborne array radar clutter suppression, in particular to an airborne radar clutter suppression method based on emission space-time weight optimization and knowledge-assisted space-time adaptive processing (KA-STAP). Background technique [0002] Space-Time Adaptive Processing (STAP) is an important technology applied to airborne array radar. STAP uses training samples to estimate the covariance matrix of the Cell Under Test (CUT) and designs a receiving filter to suppress Clutter, improve the signal-to-clutter-plus-noise ratio (Signal-to-clutter-plus-noise Ratio, SCNR). The RMB criterion points out that the number of independent and identically distributed (I ID) training samples required for covariance matrix estimation is at least twice the matrix dimension in order to make the output signal-to-noise ratio loss less than 3dB; but in actual work, The environment faced by airborne radar is usually non-uniform, a...

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Problems solved by technology

Under the same conditions, the transmit space-time weight vector optimization method and the STAP receive SNR can achieve the same effect, but the transmit space-time weight vector design completely depends on the clutter prior information, and the inaccuracy of the prior information will lead to poor performance of the algorithm. significantly decreased (Chen Yangyi, Li Jun, Zhang Shengyu, et al. Space-time joint design of launch weight vectors based on cognition[J]. Radar Science and Technology, 2015(6):650-654.); and, launch space-time weighted It will lead to changes in the spectral characteristics of the received clutter and the loss of corresponding clutter information, making it more difficult to estimate the prior covariance matrix of the received clutter

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