Target detectio ith high frequency surface ave radar in co-channel interference

OSMAR2003 high frequency surface ave radar (HFS R) system became operational i the autum of 2003. Apart from providing surveillance of over 40000 square kilometres of the sea environment such as surface current and sea state, the radar facility has the potential of detecting and tracking ships i all eather. Susceptibility of HFS R to external co-channel interference (CCI) may degrade performance significantly. I the paper, the characteristics of co-channel interference are described, and the authors present a comparative analysis of spatial domai and temporal domai interference mitigatio algorithms for target detection. Experimental results confirm that adaptive spatial domai interference suppressio using subarrays and temporal domai interference suppressio based o classical einer predictio filters are both helpful techniques for target detectio i a small-scale antenna array he the incident interference and the target signal have different incoming directions, but the spatial domai technique is likely to distort the angular response of the target signal simultaneously. Alternatively, he the incident interference and the backscattering target signal have the same incoming direction, the adaptive spatial domai algorithm ill simultaneously degrade the target signal hile providing effective interference mitigation, but the temporal domai technique ca ork ell o target detectio hile maintaining distortionless output of the target signal.