Formation of reference images and decision function in radiometric correlationextremal navigation systems
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 4, Issue 9
Abstract
<p class="a"><span lang="EN-US">Methods for formation of reference images (RI) and unimodal decision function (DF) have been developed to ensure efficient functioning of radiometric correlationextreme navigation systems (CENS) of flying machines (FM). The methods were developed for the conditions of CENS position finding on the surfaces of sighting (SS) with a highly developed infrastructure at insignificant altitudes of flight of the flying machine which leads to formation of current images (CI) with a nonstationary structure. Nonstationarity of CI arises when geometric conditions of sighting the threedimensional objects change. The method of RI formation is based on the use of a set of threedimensional stationary objects with the highest radiobrightness temperature, their contouring and determination of mean radiobrightness temperature.</span></p><p class="a"><span lang="EN-US">A method for forming a unimodal DF of radiometric CENS which takes into account threedimensional form of SS objects, spatial position and orientation of the FM was developed. The method is based on CI preprocessing which consists in its layering with respect to the mean radiobrightness temperature of background and determination of a set of objects with the highest radiobrightness temperature. The set of objects defined by their contouring is used as a geometric invariant with an informative attribute in the form of average radiobrightness temperature.</span></p><p class="a"><span lang="EN-US">It was established by simulating the process of formation of DF that pronounced unimodal DFs are formed at signaltonoise ratio (q=5...10) at the output of the radiometric channel. At the same time, the possibility of correct localization of the binding object in TI is close to unity and reduction of influence of perspective and scale distortions of images on accuracy of CENS location is ensured.</span></p><p class="a"><span lang="EN-US">The simulation results have confirmed effectiveness of the proposed methods of formation of RI and DF for location of radiometric CENS on the sighting surfaces with complex threedimensional objects leading to formation of a nonstationary CI.</span></p>
Authors and Affiliations
Nataliia Yeromina, Serhii Petrov, Alexander Tantsiura, Maksym Iasechko, Volodymyr Larin
Keywords
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- EP ID EP528110
- DOI 10.15587/1729-4061.2018.139723
- Views 119
- Downloads 0
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