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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, 2020, Vol. 17, No. 1, pp. 59-67

New assessment of linear instrumental ground resolution of Earth remote sensing spacecraft for perfect design of its optoelectronic equipment

K.N. Sviridov 1 , A.E. Tyulin 1 , S.A. Pulinets 1, 2 
1 Russian Space Systems JSC, Moscow, Russia
2 Space Research Institute RAS, Moscow, Russia
Accepted: 23.01.2020
DOI: 10.21046/2070-7401-2020-17-1-59-67
The paper is devoted to perfect designing of optic electronic equipment (OEE) for Earth remote sensing spacecraft (ERS SC) based on criteria for assessing the limit instrumental ground resolution of ERS SC. Two criteria are considered: the well-known international criterion for assessing geometric resolution ― Ground Sample Distance (GSD-criterion) and a new domestic criterion for assessing linear resolution proposed by Russian Space Systems (RSS-criterion). Results of using these two criteria were compared while designing their OEE. It was found that using GSD criterion is incorrect for designing Nyquist-matched (perfect) OEE. The OEE that does not match the Nyquist criterion reduces instrumental ground resolution of ERS SC and leads to unjustified financial losses for the customer to create a lens with a larger diameter. The paper suggests that the RSS-criterion, which is free from the disadvantages and limitations of the GSD-criterion, should be used to design OEE. Application of RSS-criterion will provide agreement of the designed OEE to the Nyquist criterion and ensure, in operation as a part of ERS SC, the possibility to achieve the diffraction limit of the linear ground resolution while compensating atmospheric distortions and using less diameter lenses with acceptable cost characteristics. This economy will in its turn make it possible to essentially increase Russian small ERS SC grouping which is necessary to improve the quality of natural and man-made disasters monitoring and forecasting. The paper gives an example of perfect OEE designing based on the RSS-criterion and its implementation under the actual usage conditions aboard small ERS SC using new technologies of distortion compensation while collecting and processing ERS images.
Keywords: geometric resolution ― GSD-criterion, linear resolution ― RSS-criterion, diffraction resolution, Nyquist criterion, perfect projecting of OEE for ERS SC, compensation of atmosphere distortions
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