Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2019, Vol. 16, No. 5, pp. 59-64
Issues of providing geographic referencing of Earth remote sensing images
G.A. Avanesov
1 , R.V. Bessonov
1 , A.N. Kurkina
1 , A.V. Nikitin
1 , A.A. Forsh
1 1 Space Research Institute RAS, Moscow, Russia
Accepted: 04.10.2019
DOI: 10.21046/2070-7401-2019-16-5-59-64
One of the most important characteristics of satellite remote sensing data is the accuracy of their geo-referencing. Ensuring the accuracy of geo-referencing is largely determined by the accuracy of measuring the orientation by onboard spacecraft and the measurement accuracy of stellar orientation instruments. The solution to these issues is complex. It is necessary to deal with the random component of the error in determining the orientation of stellar sensors, use several stellar instruments to build equal-current orientation, and deal with slowly changing and low-periodic errors, including those caused by thermoelastic deformations of the instrument and spacecraft design. Along with this it is necessary to use gyroscopes of ultrahigh accuracy. The work shows that a set of measures has been implemented on modern domestic Earth remote sensing spacecraft, and new-generation stellar orientation devices have been introduced, which together allows for geo-referencing with an accuracy of units of meters. The basis of these methods of dealing with slowly varying and low-period orientation measurements is the flight photogrammetric calibration of stellar orientation devices by stars and the construction of a thermostable design of devices and spacecraft. The random component of the measurement error of orientation is minimized through the use of more modern and high-precision stellar orientation instruments, as well as the joint processing of the readings of several instruments.
Keywords: geo-referencing of Earth remote sensing data, star tracker, spacecraft orientation
Full textReferences:
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