To study battle-field simulation methods based on Vega,a virtual battle-field simulated by an imaginary combat happened on the sea was designed. The simulation framework in the sea battle-filed included helicopter sim...To study battle-field simulation methods based on Vega,a virtual battle-field simulated by an imaginary combat happened on the sea was designed. The simulation framework in the sea battle-filed included helicopter simulation,fire simulation, collision detection and detonation, and simulation of dynamic sea surface. The method to build the simulation environments and actions to them was discussed. And the simulation experiments were conducted.,It is indicated that the simulated sea battle-field based on Vega is feasible and helpful for forces and battle-field.展开更多
We present a study on the retrieval sensitivity of the column-averaged dry-air mole fraction of CO2(XCO2) for the Chinese carbon dioxide observation satellite(TanSat) with a full physical forward model and the optimal...We present a study on the retrieval sensitivity of the column-averaged dry-air mole fraction of CO2(XCO2) for the Chinese carbon dioxide observation satellite(TanSat) with a full physical forward model and the optimal estimation technique. The forward model is based on the vector linearized discrete ordinate radiative transfer model(VLIDORT) and considers surface reflectance, gas absorption, and the scattering of air molecules, aerosol particles, and cloud particles. XCO2 retrieval errors from synthetic TanSat measurements show solar zenith angle(SZA), albedo dependence with values varying from 0.3 to 1 ppm for bright land surface in nadir mode and 2 to 8 ppm for dark surfaces like snow. The use of glint mode over dark oceans significantly improves the CO2 information retrieved. The aerosol type and profile are more important than the aerosol optical depth, and underestimation of aerosol plume height will introduce a bias of 1.5 ppm in XCO2. The systematic errors due to radiometric calibration are also estimated using a forward model simulation approach.展开更多
基金Sponsored by the Heilongjiang Natural Fund for Oversea People(Grant No.LC06C08)Heilongjiang Education Science Research Fund for Oversea People (Grant No. 1151hq008)+3 种基金Heilongjiang Postdoctor Research Fund (Grant No.LBH-Z06106)the Natural Science Foundation of China (Grant No.60671011)the Science Fund for Distinguished Young Scholars of Heilongjiang Province (Grant No. JC200611)the Foundation of Harbin Instituteof Technology (Grant No.HIT.2003.53)
文摘To study battle-field simulation methods based on Vega,a virtual battle-field simulated by an imaginary combat happened on the sea was designed. The simulation framework in the sea battle-filed included helicopter simulation,fire simulation, collision detection and detonation, and simulation of dynamic sea surface. The method to build the simulation environments and actions to them was discussed. And the simulation experiments were conducted.,It is indicated that the simulated sea battle-field based on Vega is feasible and helpful for forces and battle-field.
基金supported by the Strategic Priority Research Program- Climate Change: Carbon Budget and Relevant Issues (Grant No. XDA05040200)the National High-tech Research and Development Program of China (Grant No. 2011AA12A104)
文摘We present a study on the retrieval sensitivity of the column-averaged dry-air mole fraction of CO2(XCO2) for the Chinese carbon dioxide observation satellite(TanSat) with a full physical forward model and the optimal estimation technique. The forward model is based on the vector linearized discrete ordinate radiative transfer model(VLIDORT) and considers surface reflectance, gas absorption, and the scattering of air molecules, aerosol particles, and cloud particles. XCO2 retrieval errors from synthetic TanSat measurements show solar zenith angle(SZA), albedo dependence with values varying from 0.3 to 1 ppm for bright land surface in nadir mode and 2 to 8 ppm for dark surfaces like snow. The use of glint mode over dark oceans significantly improves the CO2 information retrieved. The aerosol type and profile are more important than the aerosol optical depth, and underestimation of aerosol plume height will introduce a bias of 1.5 ppm in XCO2. The systematic errors due to radiometric calibration are also estimated using a forward model simulation approach.
