Digital Wireless Transmission of Live Video Wright State High Altitude Balloon Team F INAL P RESENTATION Greg Taylor, Brandon Bayer, Tom Holmes Faculty.

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Presentation transcript:

Digital Wireless Transmission of Live Video Wright State High Altitude Balloon Team F INAL P RESENTATION Greg Taylor, Brandon Bayer, Tom Holmes Faculty Advisors: Dr. John Wu & Dr. Joseph Slater Electrical Engineering Mentor: Bruce Rahn

Outline  Goals  Design  Results  Balloon Launch  Conclusion

Initial Goal Achieve real-time video transmission from the high altitude balloon via a standalone software-defined radio.

Design: RF The FCC requires the RF signal path for the operating frequency to be above 420 MHz Operating frequency is MHz Optimum performance is at line of sight conditions 20 dB amp is used with the E100 (+20dbm output) Yagi antenna: RX (14 dB gain) ¾ wavelength whip antenna: TX (1:1 unity gain)

Design: Path Loss The balloon altitude of 100,000 feet = 30.4 km FSPL(dB) = 20*log(Frequency(MHz) + 20*log(distance(km)) Transmission frequency of MHz yields 120 dB of signal path loss The signal strength of the transmitted signal at MHz with the 20 dB amplifier is +20 dBm output The signal level under line of sight ideal conditions is = -100 dBm at the receiver, which is 25 to 30 dB above noise floor The Yagi antenna adds 14 dB gain making the received signal at 100,000 feet to be 30 to 44 dB above noise floor

Design: Standalone SDR Transmitter

Design: SDR Receiver

Design: Parts List Price 11.1V 6600 ma/Hr Lithium-Ion Batter Pack $ V 4400 ma/Hr Lithium-Ion Battery Pack $45.99 Life Cam HD-5000 Web Cam $40.95 Castle Creations CC-CEB Pro Battery Eliminator Circuit $40.99 E100 (Software Defined Radio) $1300 EC3 Connectors $3.99 Total $

Results: Ground Testing Basic waveforms, small text & audio files at 3 ft Live video streaming at 3 ft in lab Live video streaming at 100 ft in Russ hallway Live video streaming at 700 ft in Joshi parking lot Live video streaming at 2,800 ft along Colonel Glenn Hwy Live video streaming at 25,000 ft (4.7 miles) from Wright Memorial to N/E side of WPAFB

Balloon Launch 29 Thursday, May 31 st, 2012 Launched from Anderson Airfield (south of Bellbrook) Two packages – Command Package for tracking & communication – Video Package for video capture & transmission Successful launch and recovery Successfully received live video to 60,000 feet!

Balloon Launch 29

Conclusion Team Live Video has successfully met our goal Improvements necessary for future designs – Must obtain better E100 performance by moving processing to the FPGA or upgrading the hardware – Build Yagi receiving antenna with better precision – Optimize video encoding/decoding to achieve better performance and robustness Could use antenna on roof of Russ for receiving Launching high altitude balloons are a lot of work!

End Any Questions?