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INVESTIGATION OF THE DEPENDENCE OF THE INFORMATION DELIVERY EFFICIENCY ON THE PRODUCTIVITY OF THE EARTH REMOTE SENSING SPACECRAFT
Leonid V. Kurahtenkov, MTUCI, Moscow, Russia, lkurakht@srd.mtuci.ru
Denis S. Chirov, MTUCI, Moscow, Russia, chirov@srd.mtuci.ru
Victoria V. Domozhakova, MTUCI, Moscow, Russia
Abstract
Systems and products of rocket and space technology are complex technical systems, the effectiveness evaluation of which involves various approaches. In relation to modern spacecraft and space systems for the Earth remote sensing, two important characteristics are considered: the productivity and the data delivery efficiency to ground-based infrastructure. These requirements in spacecraft engineering or in posteriori estimates of functioning spacecraft are often considered separately, while in reality they are closely relative. In article are considering the dependences of the satellite systems productivity on the data delivery efficiency for different spacecraft operation programs. During modeling of the Earth remote sensing spacecraft functions, two algorithms of prioritizing images for transmission to the information receiving point were considered: «queue» (the «oldest» image is transmitted first) and «stack» (the last received image is transmitted first). Simulation was performed in modeling software of satellite QSatStat systems functions, developed in MTUCI for the following conditions: spacecraft is on circular sun-synchronous orbit of 475km height, the size of one frame -2 GB, speed of high-speed radio link — 300 Mbit/s, two ground receiving information stations (Moscow and Ulan-Ude), the observation objects are located at the nodes of the equidistant (uniform) grid on the Earth’s surface. The simulation results showed that the productivity of the Earth remote sensing spacecraft significantly depends not only on the speed of images delivery, but also on the selected algorithm of prioritizing of information transmitting to the information receiving point. In dependents of the prioritization algorithm, the information delivery speed with the same productivity of the Earth remote sensing spacecraft can vary by a factor of 2-3.
Keywords: space systems, the Earth remote sensing, simulation, productivity, efficiency.
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Information about authors:
Leonid V. Kurahtenkov, PhD, head of laboratory, MTUCI, Moscow, Russia
Denis S. Chirov, Grand Dr. in Engineering, chief researcher, MTUCI, Moscow, Russia
Victoria V. Domozhakova, software engineer, Moscow, Russia