TN941.1 99053270电视跟踪系统中图像目标的预测跟踪算法研究=Researchon prediction tracking algorithm of imagetarget in TV tracking systems[刊,中]/王春平,朱元昌,黄允华(石家庄军械工程学院.河北,石家庄(050003))//测控技术.—1...TN941.1 99053270电视跟踪系统中图像目标的预测跟踪算法研究=Researchon prediction tracking algorithm of imagetarget in TV tracking systems[刊,中]/王春平,朱元昌,黄允华(石家庄军械工程学院.河北,石家庄(050003))//测控技术.—1999.18(3).—45—47研究了在短暂遮挡情况下,应用最小二乘法的N点线性及平方预测跟踪算法,并分析了跟踪预测值在正常跟踪条件下的作用。图1参7(李瑞琴)TN941.4 99053271调幅光链路载噪比与频道等效噪声带宽及光调制度的关系=Dependence of frequency modulation op-展开更多
The predissociation of the v=9 level in the b^3Пg state by the 3∑u^＋ state of helium eximer （He2） was studied based on the newly observed （9, 3） band in the b^3Пg （v=9） system in the region of 12065-12445 cm...The predissociation of the v=9 level in the b^3Пg state by the 3∑u^＋ state of helium eximer （He2） was studied based on the newly observed （9, 3） band in the b^3Пg （v=9） system in the region of 12065-12445 cm^-1 employing optical heterodyne-concentration modulation absorption spectroscopy. With the help of the previous potential energy curves and molecular constants of He2, the corresponding predissociation mechanism for the b^3Пg （v=9） state was analyzed. An RKR potential energy curve of b^3Пg and an ab initio potential curve of 3∑g^＋ were used to calculate the predissociation linewidths that show basic agreement with observations, which can quantitatively explain the experiments.展开更多
Four data fusion methods, principle component transform (PCT), brovey transform (BT), smoothing filter-based intensity modulation(SFIM), and hue, saturation, intensity (HSI), are used to merge Landsat-7 ETM+ multispec...Four data fusion methods, principle component transform (PCT), brovey transform (BT), smoothing filter-based intensity modulation(SFIM), and hue, saturation, intensity (HSI), are used to merge Landsat-7 ETM+ multispectral bands with ETM+ panchromatic band. Each of them improves the spatial resolution effectively but distorts the original spectral signatures to some extent. SFIM model can produce optimal fusion data with respect to preservation of spectral integrity. However, it results the most blurred and noisy image if the coregistration between the multispectral and pan images is not accurate enough. The spectral integrity for all methods is preserved better if the original multispectral images are within the spectral range of ETM+ pan image.展开更多
A distributed feedback laser with a wavelength of 2.8μm was used to measure the species produced by water vapor glow discharge.Only the absorption spectra of OH radicals and transient H2O molecules were observed usin...A distributed feedback laser with a wavelength of 2.8μm was used to measure the species produced by water vapor glow discharge.Only the absorption spectra of OH radicals and transient H2O molecules were observed using concentration modulation(CM)spectroscopy.The intensities and orientations of the absorption peaks change with the demodulation phase,but the direction of one absorption peak of H2O is always opposite to the other peaks.The different spectral orientations of OH and H2O reflect the increase or the decrease of the number of particles in the energy levels.If more transient species can be detected in the discharge process,the dynamics of excitation,ionization,and decomposition of H2O can be better studied.This study shows that the demodulation phase relationship of CM spectrum can be used to study the population change of molecular energy levels.展开更多
Using the linear approximation method, we have studied how the correlation function C（t） of the laser intensity changes with time in the loss-noise model of the single-mode laser driven by the colored pump noise wit...Using the linear approximation method, we have studied how the correlation function C（t） of the laser intensity changes with time in the loss-noise model of the single-mode laser driven by the colored pump noise with signal modulation and the quantum noise with cross-correlation between the real and imaginary parts. We have found that when the pump noise self-correlation time T changes, （i） in the case of r 〈〈 1, the C（t） vs. t curve experiences a changing process from the monotonous descending to monotonous rise, and finally to the appearance of a maximum; （ii） in the case of r 〉〉 1, the curve only exhibits periodically surging with descending envelope. When r 〈〈 i and T does not change, with the increase of the pump noise intensity P, the curve experiences a repeated changing process, that is, from the monotonous descending to the appearance of a maximum, then to monotonous rise, and finally to the appearance of a maximum again. With the increase of the quantum noise intensity O,, the curve experiences a changing process from the monotonous rise to the appearance of a maximum, and finally to the monotonous descending. The increase of the quantum noise with cross-correlation between the real and imaginary parts will lead to the fall of the whole curve, but not affect the form of the time evolution of C（t）.展开更多
文摘TN941.1 99053270电视跟踪系统中图像目标的预测跟踪算法研究=Researchon prediction tracking algorithm of imagetarget in TV tracking systems[刊,中]/王春平,朱元昌,黄允华(石家庄军械工程学院.河北,石家庄(050003))//测控技术.—1999.18(3).—45—47研究了在短暂遮挡情况下,应用最小二乘法的N点线性及平方预测跟踪算法,并分析了跟踪预测值在正常跟踪条件下的作用。图1参7(李瑞琴)TN941.4 99053271调幅光链路载噪比与频道等效噪声带宽及光调制度的关系=Dependence of frequency modulation op-
基金Acknowledgments： This work is supported by the National Natural Science Foundation of China （No.11034002 and No.11004062）, the National Key Basic Research and Development Program of China （No.2010CB922903 and No.2011CB21602）, and the Basic Key Program of Shanghai Municipality （No.07JC14017）. Chuan-liang Li is grateful to the support of the PhD Program Scholarship Fund of the East China Normal University 2009. The authors thank Pro- fessor Robert J. LeRoy from University of Waterloo for providing his BCONT, RKR and LEVEL programs,and authors are also particularly grateful to Dr. Xing- can Dai from JI-LA and NIST for his helpful and useful suggestions and discussions in simulation.
文摘The predissociation of the v=9 level in the b^3Пg state by the 3∑u^＋ state of helium eximer （He2） was studied based on the newly observed （9, 3） band in the b^3Пg （v=9） system in the region of 12065-12445 cm^-1 employing optical heterodyne-concentration modulation absorption spectroscopy. With the help of the previous potential energy curves and molecular constants of He2, the corresponding predissociation mechanism for the b^3Пg （v=9） state was analyzed. An RKR potential energy curve of b^3Пg and an ab initio potential curve of 3∑g^＋ were used to calculate the predissociation linewidths that show basic agreement with observations, which can quantitatively explain the experiments.
文摘Four data fusion methods, principle component transform (PCT), brovey transform (BT), smoothing filter-based intensity modulation(SFIM), and hue, saturation, intensity (HSI), are used to merge Landsat-7 ETM+ multispectral bands with ETM+ panchromatic band. Each of them improves the spatial resolution effectively but distorts the original spectral signatures to some extent. SFIM model can produce optimal fusion data with respect to preservation of spectral integrity. However, it results the most blurred and noisy image if the coregistration between the multispectral and pan images is not accurate enough. The spectral integrity for all methods is preserved better if the original multispectral images are within the spectral range of ETM+ pan image.
基金the National Natural Science Foundation of China(No.61625501,No.61427816)the Open Fund of the State Key Laboratory of High Field Laser Physics(SIOM)the Open Fund of the State Key Laboratory of Precision Spectroscopy。
文摘A distributed feedback laser with a wavelength of 2.8μm was used to measure the species produced by water vapor glow discharge.Only the absorption spectra of OH radicals and transient H2O molecules were observed using concentration modulation(CM)spectroscopy.The intensities and orientations of the absorption peaks change with the demodulation phase,but the direction of one absorption peak of H2O is always opposite to the other peaks.The different spectral orientations of OH and H2O reflect the increase or the decrease of the number of particles in the energy levels.If more transient species can be detected in the discharge process,the dynamics of excitation,ionization,and decomposition of H2O can be better studied.This study shows that the demodulation phase relationship of CM spectrum can be used to study the population change of molecular energy levels.
文摘Using the linear approximation method, we have studied how the correlation function C（t） of the laser intensity changes with time in the loss-noise model of the single-mode laser driven by the colored pump noise with signal modulation and the quantum noise with cross-correlation between the real and imaginary parts. We have found that when the pump noise self-correlation time T changes, （i） in the case of r 〈〈 1, the C（t） vs. t curve experiences a changing process from the monotonous descending to monotonous rise, and finally to the appearance of a maximum; （ii） in the case of r 〉〉 1, the curve only exhibits periodically surging with descending envelope. When r 〈〈 i and T does not change, with the increase of the pump noise intensity P, the curve experiences a repeated changing process, that is, from the monotonous descending to the appearance of a maximum, then to monotonous rise, and finally to the appearance of a maximum again. With the increase of the quantum noise intensity O,, the curve experiences a changing process from the monotonous rise to the appearance of a maximum, and finally to the monotonous descending. The increase of the quantum noise with cross-correlation between the real and imaginary parts will lead to the fall of the whole curve, but not affect the form of the time evolution of C（t）.
