Graciela Velasco Herrera

Use of passive remote sensing system for optimum measurement of physical properties for oceans with foam

In this paper we show the results related with the possibility of measure the electrophysical properties of Oceans with foam by using the passive remote sensing system. To solve the problems of remote sensing of different surfaces based in the use of the radiometers, it is necessary to establish multiparametric measurements. By using of multichanel radiometers, we can receive signs of different frequency, polarizations, directions. The algorithms of processing of thermal radiation used in terrestrial surfaces are also shown. These algorithms have been synthesized base on the maximum verisimilitude criteria. The algorithms include the operations of statistical processing of characteristic thermal radiation in order to receive the statistical characteristics of the electrophysical parameters of the Ocean. To reach it regressive model of the Ocean with foam, is analyzed in an temperature interval of 273-310 K, with different percent of salts and to different wind velocities. We analyzed the polarization type, monitoring angles, height of the antenna in order to the errors of measurements be minimum. These recommendations can be useful for planning aerospace experiments for studding the Ocean. This information can be obtained by using the inverse elements of the Fisher matrix.

Optimum algorithms to probe the large wavelength earth surfaces using active remote sensing systems

To resolve the remote sensing problem of the surfaces by means of use of the synthesis aperture radar (SAR) with high resolution it is necessary to perform the multiparametric measurements. This could be achieved with the help of the multichannel scatterometers that could give the possibility to receive the signals in the different frequency bands, of different polarization, from different directions, etc. In this paper the algorithms of such a combined processing are examined. These algorithsm were synthesized by the solving of the optimization problems. They include the classical operations of the aperture synthesis and operations of the adaptive signal whitening, and statistical characteristic calculation of the Earth covers parameters, as well. Some results of the limits of the measurement errors for the electrophysical parameters such as permittivity, the root-mean-sqaure of the height and the correlation radius of irregularities, etc. within the wide range of reference values were studied.

Electrophysical parameters and statistical performances of the ocean and sea by passive methods

The development of high frequencies theory and practice of radiometric sensing of environment has shown an opportunity to receive the information on temperature and salinity of superficial water layer, underwater wind speed, on which depends geometry of a surface and share of its covering foamed formation. The further development of satellite microwave measurement needs to find a solution to the problem of great multiparametrical return tasks. In this paper we consider regression and electrodynamic model of the sea and ocean and their limiting errors of electro physical parameters measurements of sea surface in order to find the solution to the tasks. The measurements are investigated at passive remote sensing. Temperature and concentration dependence of complex dielectric permeability of water and water mono and polyelectrolyte systems are also investigated. The measurements are executed with the help of the developed experimental stand of a reflective type on frequency 35.5 GHz at the interval of temperatures 271-353 K. Radiobrilliance temperature for regression and electrodynamic models of the sea and ocean, are designed with the help of received date.

Usage of passive remote sensing for optimum measurement of physical properties of petroleum films on marine surface

In the present paper the algorithms of optimum handling of fields of own radiothennal radiation are synthesized and the outcomes of researches of behaviors of limiting errors of measurement of parameters of petroleum films These data can be received at the rate of potential exactitudes (limiting errors of measurements), defined by Rao-Kramers inequality or diagonal elements of covariance matrixes of errors, inverse information matrixes Fisher.In the present paper the algorithms of optimum handling of fields of own radio thermal radiation are synthesized and the outcomes of researches of behaviors of limiting errors of measurement of parameters of petroleum films. These data can be received at the rate of potential exactitudes, defined by Rao-Kramers inequality or diagonal elements of covariance matrixes of errors, inverse information matrixes Fisher.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.