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Algorithms of joint processing radio and optical images

Keywords:

V.K. Klochko – Dr. Sc. (Eng.), Associate Professor, Professor, Head of Department, Ryazan State Radio Engineering University E-mail: klochkovk@mail.ru O.N. Makarova – Engineer, Department of Radio Systems, Ryazan State Radio Engineering University


In case of observation over objects by means of radiometric system of the millimetric range the radiometer antenna line by line scans a review zone, the signal accepted by the antenna passes a path of primary processing and the matrix of the radio thermal image (RTI) in elements of sampling of the place angle and azimuth is as a result created. The matrix of RTI is affected to secondary processing by means of operations of images recovery. Because of short precision of restoration spatial permission of the restored image exceeds the sampling element sizes that does the image of objects insufficiently accurate. Accuracy of restoration depends on the accuracy of determination of the radiometer apparatus function which describes action of the direction characteristic of the antenna and a path of preprocessing on the required image. In some cases the apparatus function is a priori unknown and its search precedes operations of recovery of images. The work purpose is formation of the radio thermal image matrix with spatial resolution, equal to the sampling element size, in the conditions of prior uncertainty concerning apparatus function due to joint processing of radio thermal and optical images. Algorithms of joint processing radio thermal and optical images are offered. The first algorithm allows to find estimates of the apparatus function in case of the unknown standard image due to receiving estimates of the standard image using the optical image of control object. The second algorithm allows to create the radio thermal image of a review zone with spatial resolution, equal to the sampling element size. Thereby the temperature card of a review zone with the sharp image of observation objects is created. Results of modeling show advantage of the offered approach in comparison with the alternative decision.
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