1. US Naval Academy LABsats Bob Bruninga, WB4APR AIAA JHU/APL Educational Seminar 10 Nov 2006

2. USNA Satellites Bob Bruninga, WB4APR

3. Basic USNA’sat

4. Digital Transponder Telemetry system has 1200/9600 baud available STP Experiments can interface to serial ports here PCsat SCIENCE USNA-0203

5. The USNA Constellation

6. USNA PCSAT2 on ISS Launched Aug 2006, attached to ISS 1 Year of 3 Mbytes data per day Supported Packet and Voice Relay Returned Sept 2006

7.  The comm channels can potentially draw from over 30,000 experimenters for easy assessment of loading and scaling issues.  Not only the sensors and users exist, but the global Internet collection and distribution system also exists from PCSAT1 & 2.  Our Satellites provide a low cost educational transponder supporting not only GPS position reporting but also remote WX stations and other data link experiments and other University and School Experiments.

8. Space User Baseline PCSAT validates our links Vandegriff SCIENCE USNA-0203 PCSAT2 User Plot 18 Apr 06 See www.ariss.net

9. Global Internet Linked Ground Stations All downlinks available live on web via Participating internet linked Ground Stations www.ariss.net pcsat.aprs.org SCIENCE USNA-0203

10. Types of Labs Antenna Labs:........ Link, Patterns, Gain, Beamwidth, SWR Electrical Power sys:.. Solar Cells, batteries and Regulators Transmitters:......... TX power and antenna matching Receivers:........... Receiver sensitivity, selectivity and Bandwidth Comms:............. FSK, AFSK,PSK ; and TDMA and FDMA Telemetry:........... Signals, decoding, equations 5 channel A/D Command / Control:... Using the 3 commandable ON/OFF circuits. CPU and Experiments:. Aux serial port – processor, GPS, etc GPS interface:........ Using a GPS input for position determination Attitude Control:.......Passive/active Magnetorquing & wheels. Thermal Control:...... Absorbtivity, Emissivity, Conduction.

11. LABsat Examples

12. Ground Stations Laptop Ground Station for RAFT

13. Antenna Tests  Uses small 2.4 GHz camera/transmitters  First observe dipole link (1000’)  Place dipole at dish focus and measure gain  Swing dish to see Beamwidth

14. Antenna Tests Using PI network to match spacecraft antenna for best SWR Using GPS signals to plot antenna pattern of GPS

15. Antenna Tests RF LABsat model on rotor Rotator and S/A to plot pattern Dipole 1 Antenna Phasing experiment

16. Transmitter Tests Power out Efficiency Temperature Spectrum and EMI

17. Receiver Tests

18. Demodulation - FSK  All Seven Student LABsats on the air  Sharing a single TDMA channel  Using FSK for demodulation

19. Demodulation - PSK LABsat configured as HF to UHF linear transponder Indoor LABsat RX PSK-31 Waterfall Spectrum display on Student’s workstation

20. KPC-3+ Telemetry System

21. Used for Data LoggingSolar Panel Lab

22. Satellite Power Systems Solar Panel IV curve Series/Shunt Regulators NiCd Charge/Discharge

23. Attitude Control Labs Thruster Firing

24. Passive Magnetic Stabilization

25. MagneTorquing Stabilization

26. Momentum Wheel Stabilization

27. Serial Data Telemetry

28. APRS Global Network Google for “USNA Buoy” Select USNA-1 This data is LIVE Google WB4APR-9

29.  The comm channels can potentially draw from over 30,000 experimenters for easy assessment of loading and scaling issues.  Not only the sensors and users exist, but the global Internet collection and distribution system also exists from PCSAT1 & 2.  Our Satellites provide a low cost educational transponder supporting not only GPS position reporting but also remote WX stations and other data link experiments and other University and School Experiments.

30. Antenna Deployment

31. Typical ISS Passes

32. USNA Satellites Bob Bruninga, WB4APR