最大熵法在风廓线雷达谱分析中的应用研究
|
摘要
为了解现代谱分析技术在风廓线雷达中应用的可行性,通过采用实测的和模拟的风廓线雷达回波信号,对比研究了FFT法与最大熵法的谱分析效果。结果表明:(1)当回波信号比较强时,两者都可以得到较好的谱分析效果;但是当回波信号较弱时,最大熵法分析效果优于FFT法,最大熵法对地杂波具有较好的抑制能力。(2)最大熵谱比较光滑,表明最大熵法对随机白噪声也有一定的抑制作用。(3)最大熵法的递推阶数对谱分析结果有一定影响,最终预测误差准则确定的递推阶数一般偏小,采用15阶的递推阶数进行最大熵法分析取得了较好结果。由于风廓线雷达回波通常都较弱,因此研究结果可望用于改善信号处理效果。
In order to know the feasibility that the modern spectrum analysis ways are applied in wind profiler,the fast Fourier transform(FFT) and maximum entropy method(MEM) are contrasted by using simulation data and radar measurement data respectively.The result shows:(1)When the radar echo is strong,the effect of two methods are equivalent.But when the echo is weak,the MEM spectra are better than others.The MEM can powerfully remove the ground clutter contaminant.(2)The MEM spectra are smooth,so it can be used to reduce white noise influence also.(3)The iterative steps in MEM have some influence on the spectrum.The step calculated by final prediction error(FPE)rule is less.Using 15 steps in MEM can get a better result.The wind profiler radar echo is weak usually,so the conclusions of this paper can help improve the effect of spectrum analysis.
In order to know the feasibility that the modern spectrum analysis ways are applied in wind profiler,the fast Fourier transform(FFT) and maximum entropy method(MEM) are contrasted by using simulation data and radar measurement data respectively.The result shows:(1)When the radar echo is strong,the effect of two methods are equivalent.But when the echo is weak,the MEM spectra are better than others.The MEM can powerfully remove the ground clutter contaminant.(2)The MEM spectra are smooth,so it can be used to reduce white noise influence also.(3)The iterative steps in MEM have some influence on the spectrum.The step calculated by final prediction error(FPE)rule is less.Using 15 steps in MEM can get a better result.The wind profiler radar echo is weak usually,so the conclusions of this paper can help improve the effect of spectrum analysis.
引文
[1]HU Guang-shu(胡广书).Digital Signal Processing(数字信号处理).Beijing:Tsinghua University Press(北京:清华大学出版社),2009.486.
[2]WANG Xin-quan,XIANGLI Bin,HUANG Min,et al(王新全,相里斌,黄旻,等).Spectroscopy and Spectral Analysis(光谱学与光谱分析),2011,31(7):1980.
[3]Jordan J R,Lataitis R J,Carter D A.J.Atmos.Oceanic Technol.,1997,14(1):280.
[4]Lehmann V,Teschke G.J.Ann.Geophys.,2001,19(4):825.
[5]DING Min,BU Xiang-yuan(丁敏,卜祥元).Modern Electronic Technology(现代电子技术),2006,11(1):32.
[6]WANG Yong,AN Jian-ping,BU Xiang-yuan(王勇,安建平,卜祥元).Transactions of Beijing Institute of Technology(北京理工大学学报),2008,28(5):437.
[7]LUO Feng,DUAN Pei-pei,WU Shun-jun(罗丰,段沛沛,吴顺君).Journal of Xidian University(西安电子科技大学学报),2005,32(5):724.
[8]JIA Jiong,DIAO Gui-ling,PING Jian-jun,et al(贾炯,刁桂苓,平建军,等).North China Earthquake Sciences(华北地震科学),2008,26(2):7.
[9]ZHANG Kun-hui,CAO Lan-ying,XIA Liang-zheng(张昆辉,曹兰英,夏良正).Signal Processing(信号处理),2005,21(2):199.
[10]LI Qiang,ZHANG Shou-hong,ZHANG Huan-ying,et al(李强,张守宏,张焕颖,等).Acta Electronica Sinica(电子学报),2006,34(12):2180.
[11]Liu J W,Dong P M.Advances in Atmospheric Sciences,2001,18(5):873.
[12]JIANG Kui,DING Feng,WAN Wei-xing,et al(江葵,丁锋,万卫星,等),Chin.J.Space Sci.(空间科学学报),2007,27(6):491.
[13]Burg J P.Geophysics,1972,37:375.
[14]Sirmans D,Bumgarrner B.Journal of Applied Meteorology,1975,14(9):991.
[15]DING Lu-fei,GENG Fu-lu,CHEN Jian-chun(丁鹭飞,耿富录,陈建春).Radar Principle(Fourth Edited)(雷达原理.第四版).Beijing:Publishing House of Electronics Industry(北京:电子工业出版社),2010.406.
[2]WANG Xin-quan,XIANGLI Bin,HUANG Min,et al(王新全,相里斌,黄旻,等).Spectroscopy and Spectral Analysis(光谱学与光谱分析),2011,31(7):1980.
[3]Jordan J R,Lataitis R J,Carter D A.J.Atmos.Oceanic Technol.,1997,14(1):280.
[4]Lehmann V,Teschke G.J.Ann.Geophys.,2001,19(4):825.
[5]DING Min,BU Xiang-yuan(丁敏,卜祥元).Modern Electronic Technology(现代电子技术),2006,11(1):32.
[6]WANG Yong,AN Jian-ping,BU Xiang-yuan(王勇,安建平,卜祥元).Transactions of Beijing Institute of Technology(北京理工大学学报),2008,28(5):437.
[7]LUO Feng,DUAN Pei-pei,WU Shun-jun(罗丰,段沛沛,吴顺君).Journal of Xidian University(西安电子科技大学学报),2005,32(5):724.
[8]JIA Jiong,DIAO Gui-ling,PING Jian-jun,et al(贾炯,刁桂苓,平建军,等).North China Earthquake Sciences(华北地震科学),2008,26(2):7.
[9]ZHANG Kun-hui,CAO Lan-ying,XIA Liang-zheng(张昆辉,曹兰英,夏良正).Signal Processing(信号处理),2005,21(2):199.
[10]LI Qiang,ZHANG Shou-hong,ZHANG Huan-ying,et al(李强,张守宏,张焕颖,等).Acta Electronica Sinica(电子学报),2006,34(12):2180.
[11]Liu J W,Dong P M.Advances in Atmospheric Sciences,2001,18(5):873.
[12]JIANG Kui,DING Feng,WAN Wei-xing,et al(江葵,丁锋,万卫星,等),Chin.J.Space Sci.(空间科学学报),2007,27(6):491.
[13]Burg J P.Geophysics,1972,37:375.
[14]Sirmans D,Bumgarrner B.Journal of Applied Meteorology,1975,14(9):991.
[15]DING Lu-fei,GENG Fu-lu,CHEN Jian-chun(丁鹭飞,耿富录,陈建春).Radar Principle(Fourth Edited)(雷达原理.第四版).Beijing:Publishing House of Electronics Industry(北京:电子工业出版社),2010.406.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心