development progress of the eaglesat gps subsystem presented by tanner r. hilken embry-riddle...
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![Page 1: Development Progress of the EagleSat GPS Subsystem Presented by Tanner R. Hilken Embry-Riddle Aeronautical University, Prescott GPS Subsystem Lead](https://reader035.vdocuments.mx/reader035/viewer/2022081603/56649e985503460f94b9b23a/html5/thumbnails/1.jpg)
Development Progress of the EagleSat GPS
SubsystemPresented by
Tanner R. HilkenEmbry-Riddle Aeronautical University, Prescott
GPS Subsystem Lead
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Objectives
• To integrate a space rated GPS unit into the existing CubeSat platform• To obtain accurate and precise data on position,
altitude, velocity, and trajectory
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Standard Operation
• OBC determines that it is generating sufficient power
• OBC routes power to the GPS Unit
Boot
• GPS boots up and acquires a signal from any satellites it detects
• GPS calculates it’s position from the incoming signals
Operation • GPS outputs a GGA string to the OBC
• GPS outputs an RMC string to the OBC
Output
The GPS unit will continue to output one of each string at a designated time interval so long as it still has sufficient power
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Novatel OEM 615 Receiver
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GPS Input and Output
• The GPS will intake radio signals from a constellation of satellites
• It will output two ASCII strings, RMC (Recommended Minimum Sentence C) and GGA (Global Positioning System Fix Data)
http://rammb.cira.colostate.edu/dev/hillger/GPS.htm
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GPS Output
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Testing Setup
• The GPS unit is currently set up on the development kit on a mobile cart. This is to make signal acquisition simpler, as well as to allow more versatility in testing.
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The Development Kit
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The Testing Interface
• Novatel provides users with a program for interfacing with the unit through the development kit• Novatel Connect allows the user to design a custom
dashboard displaying information about various satellite functions• It also allows for easy, streamlined programming of
the GPS with a variety of options through a command window (Ex. LOG COM1 GPGGA ONTIME 1 0 HOLD)
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Novatel Connect Dashboard
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Constellation
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Position
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Plan
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Dilution of Precision
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Channel Status
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ASCII Output
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Further Testing
• Dr. Post’s testing arrangement
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Future Development
• Despite the continuing success of tests utilizing this unit, testing will continue• Future testing may include booting the GPS after
varying dormancy times• It may also include moving the unit around campus
to measure various carrier/noise ratios• Either way, the GPS will continue to be tested
rigorously before it is deemed flight ready
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Acknowledgements
• Dr. John Post, Dr. Gary Yale, and Jack Crabtree for their technical guidance and support of the EagleSat Program• ERAU College of Engineering for the continuing
support of expert faculty and financial backing• Arizona NASA Space Grant Consortium for the
continued support of funding student research interns and research projects
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Thank you very much for your attention.
Contact Information:Tanner R. Hilken
[email protected](210) 380-3084