Linearly Constrained Coherent Sidelobe Canceller for Ionosphere Interference Suppression for HFSWR

In this paper, a linearly constrained coherent sidelobe canceller for high frequency surface wave radar is presented to improve the interference cancellation performance. To overcome the target-canceling problem of traditional coherent sidelobe cancellation algorithm, a linear constrain is applied to the adaptive weight vector of auxiliary array in order to keep this adaptive weight vector within a subspace that is orthogonal to the main beam, so the target echoes in the main beam are well preserved. Measured data from real high frequency surface wave radar system is used to compare the performance of the new algorithm and the traditional one, and the results show that the new algorithm is clearly superior to the traditional algorithm.