- Independent Projects
- RCS - numerical model done, ready to order parts.
- 6 DOF (on hold)
- Rocket Tracks (ECE capstone) - First meeting of the Capstone group today. Requirements due in two weeks.
- LV3/CF airframe (ME Capstone) - no update.
- FCF + AV4-FC + FCFTF - Replaced event loop with library (libev).
- Telemetry - no updates.
- Simulation framework (CS Capstone) - still working on formal requirements doc, will be presented next week.
- Rocketnet hub - no update.
- Battery Board - Almost done, pending final review, polish and build.
- STM32 infrastructure - no update.
- 360 video (on hold)
- Digital Video (+ Elemental) - Transmitted video from RasPi camera over Ethernet to mplayer on another computer.
- LTComm (1.0 done, 1.1 on hold)
- 2.4 GHz WiFi upgrade - Found good amplifier for both rocket and trackmaster.
- TrackMaster 2.4 GHz + USB hub + PoE - no update.
- OSGPS - Finished RF overview, schematic reviewed and polished. Still needs to be matched with node6.
- Node6 - good progress, looking at new power supply chips.
- Grand Menu
- Long distance WiFi - worked on link budget with Glenn, found amps, thinking about long distance attempt.
- L3 TRA certification for May 2014 - got the final parts, ordering shared parts now.
- ITAR - Google form done for gathering public domain references.
Discussion with Jesse Rosenzweig of Elemental Technologies
Jesse is the CTO and co-founder of Elemental Technologies, a fast-growing local video processing and streaming company. He was brave enough to sit through our intro meeting (thanks!) and then stick around to discuss video, compression, and streaming technologies. We drew our notes on the whiteboard, hopefully they're enough detail to reconstruct everything:
|On the Rocket Side of Things||On the Ground|
- Digital video camera directly plugged into a video processor which compresses to H.264 (possible now), or when a board exists, H.265 (HEVC).
- Compressed video stream is forward error corrected (FECed) and sent over a MPEG2 Transport Stream using RTP.
- This goes through Ethernet, the Rocketnet Hub, the FC, and eventually gets gets down to the ground via WiFi.
- Some off-the-cuff numbers: 480p (604x480) @ 800 kbps, which would work over our worst case 1 Mbps WiFi link).
- On the ground
- A laptop running code that takes a variety of transport streams - from the rocket (which is un-FECed), and from various ground cameras like on the launch tower and on Rocket Tracks.
- These transport streams are combined, or just sent raw over LTE to Elemental's ECloud servers where it's re-formatted into a bzillion different formats for different devices.
- Possibly we use a bundled LTE device to get a higher data rate.