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Ground Station Hardware

Ground Station Hardware. 17 November 2006. Systems Overview Hardware Evolution Stanford/CalPloy Ground Operations UHF/VHF System Design Layout S-Band System Design Layout Implementation Plan. Presentation Overview. System Overview. KySat. Primary Ground Station Command and Control.

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Ground Station Hardware

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  1. Ground Station Hardware 17 November 2006

  2. Systems Overview Hardware Evolution Stanford/CalPloy Ground Operations UHF/VHF System Design Layout S-Band System Design Layout Implementation Plan Presentation Overview

  3. System Overview KySat Primary Ground Station Command and Control User Students, Teachers, Ham Operators

  4. Track KySat Use SatPC 32 & NORAD Keps Command KySat Transmit Data files Voice and Image House Keeping Telemetry Upload Data files Transmit Data files Voice and Image Ground Operations

  5. Hardware Evolution • Stanford • Ground Station • Antenna’s on top of Building • Control Room the size of Broom Closet • CalPoly • Ground Station • Antenna’s on top of Building • Small Control area – Big Capabilities • Standard UHF/VHF Ground Station • Taken from Amateur Low Cost Ham Designs • MSU Approach

  6. UHF/VHF Block Diagram

  7. UHF/VHF Antenna System • Used to track, command, and receive & upload data files from KySat • Low risk component of KySat • Standard System • RF Engineer on-site (Jeff Kruth) • Easy and Quick to assemble • About a weekend after site preparation

  8. UHF/VHF Components (Indoor) • Computer – Any running MS Windows • Tracking (SatPC 32) • Command & Control & downlink (KySat team) • Telemetry & Data files • Webcam • On-orbit operations can be viewed on KySat website via webcam

  9. UHF/VHF Components (Indoor) • Terminal Node Controller (TNC) • PacComm Packet Controller • Interface between transceiver and computer • Converts audio to digital & digital to audio • AX.25 Protocol

  10. UHF/VHF Components (Indoor) • Transceiver – ICOM • Transmit Power: 100 W • Completely Computer Controllable • Doppler Tuning via SatPC32 • Power Supply – Astron • 50 Amp • 13.8 Volt • Power Amplifier (optional) • Would provide ~ 3dB extra Power

  11. Rotator Controller Zl2AMD Auto-tracking Lightening Arrestors Polyphaser Protect from power surge Rotator Cable Antenna Cables UHF/VHF Components (Indoor) Lightening Arrestor

  12. UHF/VHF Components (Outdoor) • Cables – FMR 600 • Run together from LER to antenna tower • Low loss • UHF/VHF • Convert to FMR 400Flex Coax • Cross Polarization Combiner • Low Noise Amplifier (LNA) • Gain – 15 dB • Noise Figure ~ < 1dB • Az/El Rotator- Yaesu

  13. UHF/VHF Components (Outdoor) • Antennas • M2 Antenna Systems • Rx: 2 Meter (VHF) • Gain – 12.25 dBdc • Tx: 70 Cm (UHF) • Gain – 16.8 dBdc • Cross Dipole Yagi • Cross Polarization • KySat rotation

  14. S-Band Antenna System • Microhard: Validate Transceiver • 2.4 – 2.4835 GHz • Output Power = 1 W • Frequency hopping • Desirable because: • Commercial Off-the-Shelf Component • Low cost ($600 compared to $6000) • High Bandwidth (9600 baud) • Moderate Risk – Payload (Experimental) • Frequency hopping: Causes a delay issue that may lead to loss of data – poor synchronization • Relatively low EIRP • Doppler Shift ~ 20x worse than VHF

  15. S-Band Feed • Currently do not have an S-Band Feed horn • Design by Jeff Kruth

  16. Final CommissioningFall 2006 Verified for LEO tracking Drive Speeds Azimuth: 3° /s Elevation: 2° / s Drive Acceleration Az/El: 1.5° /s2 Can track LEO’s as low as 350 miles up to 77° without keyhole effect S-Band Gain Analysis Assume Uniform Illumination Gain = ηA4π / λ2 With η = 60% and λ = 12.5 cm Diameter = 21 m Area = π D2/4 = 346 m2 Gain = 52.2 dB MSU 21 M Space Tracking Antenna

  17. Implementation Plan • UHF/VHF Antenna System • Assemble and Test all components • Pour foundation • Positioner • Test with other cubesats (February 2007) • S-band Antenna System • Design/Construct S-band Feed Horn (Spring 2007) • Test (Fall 2007)

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