Cover Page Prev Page Next Page About

Satellite Database

The Satellite database is the list of all satellites currently in the program's memory, up to a limit of 500.
Satellite data ( keplerian element sets) enters the program from three sources:
* From published data, such as bulletin files, containing NASA 2-line or AMSAT Kep orbital elements, or state vector data.
* From the initialization file, created with Setup:Save Settings. This contains the settings for the Map Windows.
* By manual entry or modification in the Satellite Information Window. Options for automatic modifications of certain kinds are also provided. See Hints for some ideas about how to use this.

The initialization file and the last-saved kep or 2-line file are both loaded at startup. For users who need data from multiple kep or 2-line files, the File:Save As option provides a way to make a composite 2-line file.
Multiple entries for a single satellite are permitted, for those who wish to compare different element sets. Thus, some care must be taken to be sure the correct elements are selected from the list (check the epoch time or set number).
At present, the list may be reduced by clicking Delete to remove an obsolete set (unless it is in use in a Map Window). No sorting or other editing is permitted. However, the file is a standard text file, and can be edited with any text editor such as Windows NotePad.
NOTE: the AMSAT and NASA formats do not include all of the same information. In addition, some information, such as the Beacon Frequency for doppler and path-loss calculations, or the attitude information for squint calculations, is not included in the standard element sets. Such information must be manually entered, and is saved only in the initialization file, and only for the satellites associated with Map Windows.

Converted by Winhelp to Web