In this paper a new technique of objects measurement based on multi-wavelength lidar system has been proposed and developed to make horizontal-path laser measurements of objects. The two or more wavelengths laser transmitter operates within and adjacent to the sensitive bands exhibited by the characteristics of each object, the result could be used to establish inversion models of the laser transmitting backscatter signals. The application value and the key techniques of the spectral lidar are analyzed. The lidar wavelength selection method is studied and a hyperspectral experiment had
been down to testify the feasibility of the theory. Also issues to approach the final goal of this new technique are discussed.
Space borne LIDAR is a fire-new method for aerosol observations, it help us to acquire the global data on the structures
and optical properties of aerosols. In this paper, a lidar ratio selection algorithm is introduced, since lidar ratio (the
aerosol extinction-to-backscatter ratio, a S ) is an important parameter for aerosol retrieval. Then we use an appropriate
retrieval algorithm for signals which is observed by a space borne backscatter lidar, after inversion the distribution state
of aerosol optical depth can be obtained. The distribution of aerosol optical depth is not only related to the earth's surface
and the geographic location of the aerosol emission, but also related to other meteorological factor. Such as turbulent,
wind gusts, hurricanes, tornadoes, and land clearing and development activities, all of these cause aerosol drift from
initial geographic location.From summer to autumn, the changing characteristic of aerosol optical depth in Central
Southern China is analyzed by retrieving the space borne lidar signal. On a short term, through analyze the aerosol
distribution, whether or how atmospheric motion influences on aerosol particle diffusion is available.
Aerosol particles play important role in both global climate system and earth observation application. We have
developed a portable scanning Mie lidar, with the combination of spectrograph, active and passive earth observation
satellite data, and the ground sensor data, severe weather research and earth observation atmospheric correction work
could be conducted. To obtain more accurate aerosol information, we are developing a new multi-channel Raman lidar
system. Also we have developed a simulation model for system performance simulation and data simulation. In this
paper, the lidar system development, simulation modeling, and primary experimental work result will be described.
Aerosol particles are important components of the earth-atmosphere system, which change the radiance balance of earth-atmosphere system by the two processes of absorption and scattering, also distort the signal of earth observation satellite. For understanding the atmospheric attenuating effect of aerosols to satellite signals, a portable Mie Lidar system is developed, which is mainly used for measuring the optical properties of aerosol. At the same time, a radiative transfer model is introduced for implementing atmospheric correction of satellite signal. The aerosol data from lidar measurement are fed into radiative transfer code, instead of the model transcendental value. The primary results are shown in this paper. Furthermore, long-term atmospheric and aerosol data could be obtained by consecutive lidar observations. Also these data will be used for emending the existing atmospheric model and make it more compliant for China area application.
Aerosols have large impacts on radiative transfer through scattering and extinction, which distort the satellite signals in earth observation application. In the paper, we apply lidar for measuring aerosol signals simultaneously when earth observation satellite flyover. In this way, the aerosol influence could be removed precisely by the combination of real-time lidar data and atmospheric radiance transmission model. Here, the aerosol optical depth retrieved by lidar data is integrated into the 6S model for satellite image atmospheric correction. The primary results are shown in this paper.
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