大入射余角海杂波相关特性分析及幅度拟合
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摘要
对入射余角44°到74°的海杂波实测数据进行时间相关性、空间相关性分析,并提出了一种新的海杂波幅度拟合混合分布。实验表明,海杂波相关时间维持在毫秒量级,且随着入射余角增加,先增加后减小,时间相关性最强的入射余角在60°左右,而平均相关距离单元个数一直增加。通过KK分布、Rayleigh分布与K分布的对比,表明新的混合分布对大入射余角海杂波的拖尾特性具有良好的拟合效果。
In this paper, the time correlation and spatial correlation of the measured-sea-clutter data from 44° degree to74° degree grazing angle was analysed and a new sea clutter amplitude fitting distribution, a hybrid distribution, was proposed. Experiments show that correlation time of sea clutter is in the order of milliseconds, and it increases first and then decreases with increasing incident angle and the strongest correlation time appears at about 60 degree. At the same time,the average of correlation distance units increases. The comparison of KK distribution, Rayleigh distribution and K distribution shows that the new hybrid distribution fits the sea clutter well, especially its tailing characteristics.
In this paper, the time correlation and spatial correlation of the measured-sea-clutter data from 44° degree to74° degree grazing angle was analysed and a new sea clutter amplitude fitting distribution, a hybrid distribution, was proposed. Experiments show that correlation time of sea clutter is in the order of milliseconds, and it increases first and then decreases with increasing incident angle and the strongest correlation time appears at about 60 degree. At the same time,the average of correlation distance units increases. The comparison of KK distribution, Rayleigh distribution and K distribution shows that the new hybrid distribution fits the sea clutter well, especially its tailing characteristics.
引文
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[19]WEINBERG G V.Coherent multilook radar detection for targets in KK distributed clutter[R].Australia:DSTO,2012:161-176.
[20]JOUGHIN I R,PERCIVAL D B,WINEBRENNER D P.Max-likelihood estimation of K distribution paremeters for SAR datal[J].IEEE Transactions on Geoscience and Remote Sensing,1993,31(5):989-999.
[2]尹志盈,张玉石,高波.雷达杂波测量现状及发展趋势[J].制导与引信,2009,30(2):16-19.YIN ZHIYING,ZHANG YUSHI,GAO BO.Current situation and development trend of radar clutter measurements[J].Guidance and Fuzes,2009,30(2):16-19.(in Chinese)
[3]石志广.基于统计与复杂性理论的杂波特性分析及信号处理方法研究[D].长沙:国防科技大学,2007.SHI ZHIGUANG.Research on clutter characteristics analysis and signal processing method based on statistics and complexity theory[D].Changsha:National University of Defense Technology,2007.(in Chinese)
[4]宋杰,于家伟,丁昊,等.大入射余角实测高分辨率海杂波数据幅度统计特性[J].海军航空工程学院学报,2017,32(2):187-189.SONG JIE,YU JIAWEI,DING HAO,et al.Statistics properties of real high resolution sea clutter data amplitude at large grazing angles[J].Journal of Naval Aeronautical and Astronautical University,2017,32(2):187-189.(in Chinese)
[5]JAKEMAN E.Statistics of non-rayleigh sea echo[C]//IEE Radar Conference.London:IEE,1977:105-109.
[6]ROSENBERG L,WATTS S,BOCQUET S.Application of the K+Rayleigh distribution to high grazing angle seaclutter[C]//International Radar Conference.Cincinnati:IEEE,2014:1-4.
[7]ROSENBERG L,CRISP D J,STACY N J.Analysis of the KK distribution with medium grazing angle sea-clutter[J].IET Proceedings of Radar Sonar and Navigation,2010,4(2):209-222.
[8]DONG Y.Distribution of X-band high resolution and high grazing angle sea clutter:DSTO-RR-0316[R].Australia:DSTO,2006:1-5.
[9]WEINBERG G V,FINCH D.Analysis of a pareto mixture distribution for maritime surveillance radar[J].Electrical and Computer Engineering,2012(24):2-4.
[10]WEINBERG G V.An investigation of the pareto distribution as a model for high grazing angle clutter:DSTO-TR-2525[R].Australia:DSTO,2011:4-6.
[11]ROSENBERG L.Persistent sea-spike detection in high grazing angle X-band sea clutter:DSTO-TR-2820[R].Australia:DSTO,2013:4-5.
[12]CRISP D J,KYPRIANOU R,ROSENBERG L.Modelling X-band sea clutter at moderate grazing angles[C]//IEEE International Radar Conference.Australia:IEEE,2008:596-601.
[13]ROSENBERG L,CRISP D.X-band performance with medium grazing angle sea clutter[C]//European SAR Conference on Synthetic Aperture Radar(EUSAR).Germany:Aachen,2010:669-672.
[14]WARD K D,TOUGH R J A,WATTS S.Sea clutter:scattering,the K-distribution and radar performance[J].Waves in Random and Complex Media,2007,17(2):233-234.
[15]ROSENBERG L,CRISP D J,STACY N J.Analysis of the KK distribution with X-band medium grazing angle sea clutter[C]//IEEE International Radar Conference.Cincinnati:IEEE,2009:2-3.
[16]STACY N J S,BADGER D P,GOH A S,et al.The DSTO Ingara airbone X-band SAR polarimetric upgrade:first results[C]//IEEE International Geoscience and Remote Sensing Symposium.Toulouse:IEEE,2003:4474-4476.
[17]SLETTEN M A.Multipath scattering in ultrawide-band radar sea spikes[J].IEEE Transactions on Antennas and Propagation,1998,46(1):45-56.
[18]WATTS S.Radar detection prediction in K-distributed sea clutter and thermal noise[J].IEEE Transactions Aerospace Electronic System,1987,23(1):40-45.
[19]WEINBERG G V.Coherent multilook radar detection for targets in KK distributed clutter[R].Australia:DSTO,2012:161-176.
[20]JOUGHIN I R,PERCIVAL D B,WINEBRENNER D P.Max-likelihood estimation of K distribution paremeters for SAR datal[J].IEEE Transactions on Geoscience and Remote Sensing,1993,31(5):989-999.