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A software algorithm to maximize the number of Global Positioning Satellite (GPS) messages sent over a relatively slow satellite link is presented. The software was developed and implemented on a PC104 computer running vxWorks and the iridium network was used as the satellite link. The test system consists of a ground station (regular PC connected to an iridium modem through an RS-232 link) that dials into a Flight Modem (computer running vxWorks with a GPS and an iridium modem). The Flight Modem is a stand-alone PC104 computer that communicates with a GPS, processes the CRT command, and sends the "compressed data" to the ground station through an iridium link. The systems presents adjustable update frequencies achieving the maximum GPS rate of 10 times a second.
Publications
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Technical Support Package:
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Patent Number:
Not Available
Licensing:
Not Available
Public Release Date:
1/3/2008
Reference Number: KSC-12695
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