Abstract: To suppress the RF interference in the coast-ship bistatic HF surface wave SIAR, new techniques by eigenvalue decomposition (EVD) in the range domain are developed. Ascribed to the operation mode of multiple carrier frequencies and a single reception antenna, the interference in the radar is different from the conventional ones. Based on the correlation between the fast-range samples in a sweep number, a fast-range processing technique is proposed, which estimates the interference with the eigenvector of the interference correlation matrix as the weighting coefficient and takes the interference from the raw data. Furthermore, two new methods for estimating the covariance matrix are presented as well according to the Doppler feature of the interference. The techniques can reduce the requirement of memory capacity while providing enough training samples. Experimental results show the validity of the proposed techniques by the fast-range and slow-range processing.

Key words: interference suppressing, eigenvalue decomposition, bistatic HFSWR, synthesis impulse and aperture radar