We present a method of visualization of the remote sensing data that allows a quick synthesis of heterogeneous data for its interpretation by a human operator. The method is suitable for processing pictures of one optical band as well as polyzonal and hyperspectral aero pictures. It allows using a priori knowledge for visualization. Different methods of preliminary image processing can also be easily included in the model. As a result a number of alternative visualizations of the same dataset can be obtained depending on the interpretation objectives. The method is particularly efficient at the interpretation of barely visible objects. It makes it possible to reduce the influence of particular conditions of remote probing such as lightening conditions and an optical receiver on the results of visual interpretation.
The method that measures the parameters of the spectrum of the refractive index fluctuations of a turbulent medium by laser beams is put forward. The method can be used for knowledge the characteristics of the turbulence necessary at designing of laser information systems and systems for delivery of laser radiation. The information about the parametric kind of a spectrum is used as a priori information at this method. The method consists in estimating the statistic characteristics of the laser beam intensity in the observation plane and the solution of the system of equations. The system of equations is made on the basis of analytical relations between these statistic characteristics and spectrum. The domains of possible values of the parameters of spectrum of turbulent media are defined from these equations. These domains correspond to errors of measurements. The parameters of the turbulent media are calculated as the values that are common for the all domains of the possible values. The basic difference of a way from earlier ones used consists that parameters of a spectrum of fluctuations of a parameter of refraction estimate all in aggregate and simultaneously. It is the distinctive quality of this method.
The method which defines the space spectrum parameters of the turbulent medium is presented. The experiment laser beams distribution with various diameters and at different wavelengths are used to define the spectrum parameters. The relation between the value of dispersion of gravity center wandering of the laser beam and the function of correlation of intensity in the observation plane is used. The method consists in estimating the correlation function of intensity distribution and the value of dispersion of gravity center wandering of the laser beam in the observation plane using the experimental data and the solution of the system of equations. The system of equation is made on the basis of an analytical relation between this dispersion and this correlation function. This method has been used to process the data of numerical experiment. These results proved to be good. From the data about the intensity distribution of two laser beams with various diameters obtained in physical experiment, the structural characteristic of refractive index and the outer scale Lo are obtained. The method is universal in that it allows one to use the beams with an arbitrary distribution of intensity at the input of turbulent. The comparison between the results of physical experiment and numerical experiment for which the spectrum parameters have been recovered by the described method is performed. The characteristics of intensity distribution are shown to be close.
One and ten `micron' wavelength radiation was used to study laser beam propagation through a turbojet aircraft engine's exhaust. Pulse lengths were 0.1 and 2 microsecond(s) respectively, i.e. instantaneous realizations of intensity distribution (up to several thousand frames) were registered.