Abstract
Coherent sidelobe cancellation (CSLC) based on subarrays has emerged as a key technology for improving the performance of radar systems required to operate in the presence of severe interference which generally includes clutter as well as jamming. While the theory of CSLC is well known, practical issues such as how to set up the subarrays and how to avoid diminishing the desired signal when the clutter is rejected need to be addressed when it comes to implementing CSLC in operational radar systems. A new adaptive ionospheric clutter suppression algorithm based on subarrays for monostatic HF surface wave radar (HFSWR) is introduced and analysed. Detailed comparisons between the proposed algorithm and conventional CSLC are performed. Simulation and real data results confirm that the general and robust algorithm can achieve effective ionospheric clutter suppression, while not decreasing the strength of the first-order sea echo using the data recorded by the OSMAR2003 (Ocean State Monitor and Analysis Radar, manufactured in 2003), located near Zhoushan in Zhejiang, China.
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