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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2019, Vol. 16, No. 1, pp. 61-71

Evaluation of the impact of parallel image processing on the operational efficiency of the Earth remote sensing spacecraft control complex

A.I. Zaharov 1 , V.A. Lokhvitskii 1 , D.Yu. Starobinets 1 , A.D. Khomonenko 2, 1 
1 Mozhaisky Military Space Academy, Saint Petersburg, Russia
2 Emperor Alexander I Petersburg State Transport University, Saint Petersburg, Russia
Accepted: 20.12.2018
DOI: 10.21046/2070-7401-2019-16-1-61-71
An approach to assess the effect of parallelization at compression of images based on JPEG and JPEG2000 standards on the operational efficiency of the onboard complex for controlling spacecraft for Earth remote sensing is suggested. A queuing network model for evaluating the operational efficiency of the onboard complex, which allows calculating the time spent on processing and transmitting information with account for image compression with parallel operation of it on a multicore microprocessor is considered. The network model nodes represent multichannel queuing systems with general service-time distribution of the Poisson arrival flows. Non-Markov distributions of service times for requests are approximated by the phase approximation method using a second-order hyperexponential distribution. The scheme of the queuing network model and the parameters of this model are considered. Numerical examples for evaluating the operational efficiency of the onboard control complex at parallelization to a different number of kernels are given. The initial moments of the distribution of the residence time of the request in the nodes and in the network as a whole are estimated.
Keywords: image compression, discrete cosine transform, JPEG and JPEG2000 algorithms, remote sensing of the Earth, queuing systems and networks, numerical calculation methods
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