name: TLE
full_form: Two-Line Element
context: Key parameters of orbital mechanics of all commercial satellites are publicly available from multiple sources. This information is called ephemeris, which is used by astronomers to describe the location and orbital behaviour of stars and any other astronomic bodies. Typically, ephemeris is expressed in an ASCII file using Two-Line Element (TLE) format. The TLE data format encodes a list of orbital elements of an Earth-orbiting object in two 70-column lines. The contents of the TLE table are reproduced below. Table A.1-1: First line of the ephemeris Table A.1-2: Second line of the ephemeris The TLE format is an expression of mean orbital parameters "True Equator, Mean Equinox", filtering out short term perturbations. From its TLE format data, the SGP4 (Simplified General Propagation) model [10] is used to calculate the location of the space object revolving about the earth in True Equator Mean Equinox (TEME) coordinate. Then it can be converted into the Earth-Centered, Earth-Fixed
description: Two-Line Element (TLE) is a data format used to express orbital elements of an Earth-orbiting object in two lines of text. It encodes mean orbital parameters and filters out short-term perturbations, allowing for the calculation of the space object's location using the SGP4 model.
explanation: The context explicitly describes TLE as a data format used to express specific orbital elements, which are critical network attributes for operation in satellite communications. Therefore, it is classified as a Parameter.
section_title: A.1Key parameters
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biotag_Description: B-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O