Sea Clutter Processing for Target Detection in Skywave Over-the-Horizon Radar
In order to intuitively understand sea clutter, its Doppler spectrum was simulated through Barricks second-order cross section equation of HF radar. The imitated sea clutter echo was closely related to the normalized cutoff wave number of radar. Simulated results are consistent with the measured data. This paper presents CFAR-three-step-test to deal with the sea clutter of measured data for target detection: (1) detect all the distance units that passing detection threshold G; (2) judge whether the detected units being next to each other, isolated unit getting through; (3) decide whether the peak of the isolated unit being in these three special positions of positive or negative Bragg peak or zero frequency, if not, determining it a moving target. When skywave OTH radar monitored large area of sea surface, it received a large number of sea echoes. Contraposing these echoes, after analog-to-digital conversion, producing two orthogonal data, using fast Fourier transform and CFAR-three-step-test, after exclusion of all false alarms, a object was detected finally. This proves that CFAR-three-step-test can effectively reduce the sea clutter, and greatly lessen the echo broadening and ghosting caused by ionosphere contamination.
sea clutter cutoff wave number target detection CFAR skywave OTH radar
Qianzhao Lei
Department of Physics and electronic engineering, Weinan Teachers University, Weinan, Shaanxi, China
国际会议
2010 International Conference on Circuit and Signal Processing(2010年电路与信号处理国际会议 ICCSP 2010)
上海
英文
459-462
2010-12-25（万方平台首次上网日期，不代表论文的发表时间）