The Ship Detection of Sky Wave over-the-Horizon Radar with Short Coherent Integration Time
Guo Xin①; Ni Jin-lin②; Liu Guo-sui①
①Res. Center of Electron. Eng. Tech.,Nanjing Univ. of Sci. and Tech., Nanjing 210094 China;②Dept of Pre-research Nanjing Research Inst. of Electron. Tech.,Nanjing 210013 China
Abstract：Since the surveillance area of sky wave Over-The-Horizon Radar (OTHR) is very vast, realizing the ship detection with short coherent integration time (GIT) is an operational requirement for OTHR. However, short CIT and the resulting low Doppler resolution cannot separate the ship target from the close powerful ocean clutter. To resolve this problem, clutter cancellation algorithm can be adopted but it requires accurate estimation for clutter parameters, The conventional cancellation method only uses the maximal amplitude of Fourier transform to estimate the clutter parameters, which may not get satisfied estimation and cause imperfect clutter cancellation. In this paper, the phase information of Fourier transform is combined to provide more accurate estimation of clutter parameters. As the result, the power and spreading of clutter residue are reduced which is helpful for the ship visibility and identification. The above analysis and comparison have been demonstrated by real data.
2004, Vol. 26 
