嫦娥四号低频射电频谱仪降低背景噪声方法的研究
|
摘要
嫦娥四号着陆器将搭载低频射电频谱仪在月球背面进行低频射电天文观测,低频射电频谱仪的观测波段为0.1～40 MHz。根据着陆器在中国空间技术研究院的微波暗室进行的电磁兼容性试验结果,着陆器平台在该频段内自身存在非常强的噪声,其强度甚至淹没大部分来自太阳爆发的信号,难以探测有效信号,实现预期的科学目标。通过模拟仿真分析谱减法、维纳滤波及自适应滤波3种方法对着陆器噪声消除的效果,从而选择更为有效的噪声消除方法,为低频射电频谱仪在轨探测任务的数据处理提供依据。
Chang′E-4 will carry a Very Low Frequency Radio Spectrometer(VLFRS), which will land on the far-side of the moon forRadio observation.The VLFRS has an observation frequency of 0.1-40 MHz. According to Electromagnetic Compatibility(EMC) test results in the Microwave darkroom of China Academy of Space Technology, the lander platform is quite noisy in this band, and the intensity of the noise is even stronger than that of most signals from the sun burst. In this pape, we simulate and optimize background elimination through improved spectral subtraction, adaptive filtering and wiener filtering, and choose a more effective method foreliminating background.
Chang′E-4 will carry a Very Low Frequency Radio Spectrometer(VLFRS), which will land on the far-side of the moon forRadio observation.The VLFRS has an observation frequency of 0.1-40 MHz. According to Electromagnetic Compatibility(EMC) test results in the Microwave darkroom of China Academy of Space Technology, the lander platform is quite noisy in this band, and the intensity of the noise is even stronger than that of most signals from the sun burst. In this pape, we simulate and optimize background elimination through improved spectral subtraction, adaptive filtering and wiener filtering, and choose a more effective method foreliminating background.
引文
[1] JANSKY K G.Directional studies of atmospherics at high frequencies[C]// Proceedings of the Institute of Radio Engineers.1932,20:1920-1932.
[2] MIMOUN D,WIECZOREK M A,ALKALAI L,et al.Farside explorer:unique science from a mission to the farside of the moon[J].Experimental Astronomy,2012,33(2/3):529-585.
[3] 纪奕才,赵博,方广有,等.在月球背面进行低频射电天文观测的关键技术研究[J].深空探测学报,2017,4(2):150-157.
[4] 施硕彪,董亮,高冠男,等.米波太阳射电频谱仪的科学目标和技术方案[J].天文研究与技术——国家天文台台刊,2011,8(3):229-235.
[5] BOLL S.Suppression of acoustic noise in speech using spectral subtraction[J].IEEE Transactions on Acoustics Speech & Signal Processing,1979,27(2):113-120.
[6] BROWN R G,HWANG P Y C.Introduction to random signals and applied Kalman filtering:with MATLAB exercises and solutions[M].Hoboken:John Wiley & Sons,1997.
[7] WIENER N.Extrapolation,interpolation,and smoothing of stationary time series:with engineering applications[M].Hoboken:John Wiley & Sons,1949.
[8] 宋知用.MATLAB语音信号分析与合成 [M].北京:北京航天航空大学出版社,2017.
[9] 耿妍,张端金.自适应滤波算法综述[J].信息与电子工程,2008,6(4):315-320.
[10] DINIZ P S R.Adaptive filtering:algorithms and practical implementation[M].4th ed.[S.l.]:Kluwer Academic Publishers,2008.
[11] 沈福民.自适应信号处理 [M].西安:西安电子科技大学出版社,2001.
[12] 王树棠,王蕴红.自适应滤波器阶数与稳态均方误差[J].电路与系统学报,1997(1):65-67.
[13] 梅丽,苏彦,周建锋.极低频射电天文观测现状与未来发展[J].天文研究与技术,2018,15(2):127-149.
[2] MIMOUN D,WIECZOREK M A,ALKALAI L,et al.Farside explorer:unique science from a mission to the farside of the moon[J].Experimental Astronomy,2012,33(2/3):529-585.
[3] 纪奕才,赵博,方广有,等.在月球背面进行低频射电天文观测的关键技术研究[J].深空探测学报,2017,4(2):150-157.
[4] 施硕彪,董亮,高冠男,等.米波太阳射电频谱仪的科学目标和技术方案[J].天文研究与技术——国家天文台台刊,2011,8(3):229-235.
[5] BOLL S.Suppression of acoustic noise in speech using spectral subtraction[J].IEEE Transactions on Acoustics Speech & Signal Processing,1979,27(2):113-120.
[6] BROWN R G,HWANG P Y C.Introduction to random signals and applied Kalman filtering:with MATLAB exercises and solutions[M].Hoboken:John Wiley & Sons,1997.
[7] WIENER N.Extrapolation,interpolation,and smoothing of stationary time series:with engineering applications[M].Hoboken:John Wiley & Sons,1949.
[8] 宋知用.MATLAB语音信号分析与合成 [M].北京:北京航天航空大学出版社,2017.
[9] 耿妍,张端金.自适应滤波算法综述[J].信息与电子工程,2008,6(4):315-320.
[10] DINIZ P S R.Adaptive filtering:algorithms and practical implementation[M].4th ed.[S.l.]:Kluwer Academic Publishers,2008.
[11] 沈福民.自适应信号处理 [M].西安:西安电子科技大学出版社,2001.
[12] 王树棠,王蕴红.自适应滤波器阶数与稳态均方误差[J].电路与系统学报,1997(1):65-67.
[13] 梅丽,苏彦,周建锋.极低频射电天文观测现状与未来发展[J].天文研究与技术,2018,15(2):127-149.