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productivity and the data delivery efficiency to ground-based infrastruc-
ture. These requirements in spacecraft engineering or in posteriori esti-
mates 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 dif-
ferent 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 model-
ing 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 sig-
nificantly depends not only on the speed of images delivery, but also on the
selected algorithm of prioritizing of information transmitting to the infor-
mation 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.
Leonid V. Kurahtenkov,
MTUCI, Moscow, Russia, 
[e-mail]
Denis S. Chirov,
MTUCI, Moscow, Russia,