The re-entry time of the objects in such orbits is sensitive to the initial conditions.
The present methodology is being adopted at Vikram Sarabhai Space Centre (VSSC) to predict the re-entry time of GSLV-F04/CS.
Major influences when predicting the re-entry time are the changing precision of the available orbital data, the satellite's ballistic coefficient, the activity of the sun which influences the Earth's atmosphere and the underlying quality of the atmospheric model.
The aim of this paper is to study the re-entry time of the cryogenic stage of the Indian geo-synchronous launch vehicle, GSLV-F04/CS, which has been decaying since 2 September 2007 from initial orbit with eccentricity equal to 0.706.
Good agreement is noticed between the actual and the predicted re-entry times.
Although anecdotal evidence supporting this assumption has been gathered through observations of satisfactory ground control at mines utilizing FRS for ground support, ad hoc evidence alone cannot be used as a basis for rational estimation of safe re-entry times.
Instead, the present investigation has sought to quantify the parameters that influence early-age FRS lining capacity and develop an engineered approach to shotcrete lining design and estimation of safe early-age re-entry times through a rational assessment of load resistance.
The majority of research into safe re-entry times has focused on strength development in hardening shotcrete under the assumption that toughness, adhesion to the rock surface, and the ability of the FRS lining to support unstable ground are all related to the strength of the concrete matrix.
Now she is making her re-entry, this time on her own terms.
The absolute percentage error in re-entry prediction time for all the six objects is found to be less than 7%.
"Predictions of re-entry date, time and location can change significantly due to many changing factors, such as solar weather and orientation of the spacecraft," the statement said.
