摘要
工作在高频波段的超视距雷达 (OTHR)会受到流星余迹的干扰 ,这种干扰的存在 ,严重影响了OTHR的正常工作。流星余迹干扰在局部短时间幅度是很强的 ,与海杂波产生差拍 ,表现为奇异性特征。利用子波变换对信号的奇异性具有很好的检测效果 ,提出了用二进制子波变换的方法有效检测和消除流星余迹瞬态干扰 ,这种方法与正交子波滤波器比较 ,有较高的灵敏度和精度 ,并且在消除流星余迹干扰后 ,使信噪比得到提高。实测数据的仿真结果表明这种算法的有效性和实用性。
The meteor trails often interfere with echo in high frequency band which lead to OTH Radar can not work normally. The meteor trails received by the OTH radar receiver have a strong amplitude and exist in a short time, which show singular character mixed by sea clutter. In this paper, an efficiency detecting and eliminating meteor trails interference approach is presented using dyadic wavelet transform. Compared with the orthogonal wavelet filter, the method has a high sensitivity and precision in the process of detection interference, and the SNR increase after the meteor trails interference is restrained. The simulation results in real data show that the algorithm is efficient and practical.
出处
《电波科学学报》
EI
CSCD
2003年第1期23-27,共5页
Chinese Journal of Radio Science
基金
国防十五预研基金 :(No :4 130 70 5 0 4 )
国防科技预研跨行业基金 (No :5 14 0 70 2 0 80 1DZ0 119)
国防十五预研基金 (No:4 130 70 30 1)
关键词
天波超视距雷达
流星余迹
瞬态干扰
子波变换
OTHR
over-the-horizon radar (OTHR), meteor trails, transient interference, wavelet transform
