Journal of Aeronautics & Aerospace Engineering
Open Access

On techniques for fitting satellite laser ranging data

International Conference and Exhibition on Satellite

August 17-19, 2015 Houston, USA

Yousry S Hanna

National Research Institute of Astronomy and Geophysics, Egypt

Posters-Accepted Abstracts: J Aeronaut Aerospace Eng

Abstract :

The present paper is concerned with Chebyshev polynomials which are used to analyze the satellite laser ranging (SLR) data. We will apply two different techniques for fitting data. The spline technique is given to obtain a continuous approximation function of matching these Chebyshev polynomials developed for fitting data over progressively classified separate intervals. The other method is the overlapping technique. An application on the laser ranging data taken for the satellite Ajisai is given. The results followed by the discussion of the used technique are also presented. Satellite Laser Ranging (SLR) and Lunar Laser Ranging (LLR) use short-pulse lasers and state-of-the-art optical receivers and timing electronics to measure the two-way time of flight (and hence distance) from ground stations to retro reflector arrays on Earth orbiting satellites and the Moon. Scientific products derived using SLR and LLR data include precise geocentric positions and motions of ground stations, satellite orbits, components of Earth�s gravity field and their temporal variations, Earth Orientation Parameters (EOP), precise lunar ephemerides and information about the internal structure of the Moon. Laser ranging systems are already measuring the one-way distance to remote optical receivers in space and can perform very accurate time transfer between sites far apart.

Biography :

Email:

Yousry_hanna@yahoo.com