1. CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 Space Data Systems Applications in the iPAS Pathfinder Laboratory Tom Rich Operations Technology Facility Mission Systems Division / Mission Operations Directorate NASA Johnson Space Center Collaborators: Leigh Torgerson / JPL, Bill Othon / iPAS Lead / JSC Engineering Directorate

2. 2CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 integrated Power, Avionics, and Software (iPAS) Pathfinder Lab Overview The iPAS is an integrated hardware/software test and evaluation environment, in support of current and future spacecraft development The iPAS has two main elements –A common avionics, hardware, and software architecture that can be applied over various missions –A common testbed framework that supports integrated hardware/software testing for a variety of applications The iPAS includes the following (non-flight qualified) components: –Core Flight Software (GSFC) –Commercially available Proton and S950 Flight Computer boards –Power and propulsion systems based on representative flight hardware –A realistic flight deck based on the Multi-Purpose Crew Vehicle (MPCV), including realistic flight controls and displays –A Space Data System based on CCSDS protocols

3. 3CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 Current iPAS Simulated Mission The “Orion” Multi-Purpose Crew Vehicle will rendezvous with an ISS derived “waypoint” vehicle in a halo orbit about the earth-moon L2 Lagrangian point. –1.3 seconds OWLT –Easy to stationkeep: 10 M/sec per year –At the current max range of the MPCV –Halo orbit: constant line of sight L2 40 K miles Moon Earth 240 K miles Moon Halo orbit X X X X

4. 4CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 iPAS Space Data System Rationale Mission Operations Goals for iPAS: Apply internationally standardized protocols to spacecraft command, telemetry, video, and file transfer in a realistic scenario where light-time delay becomes significant –Consultative Committee for Space Data Systems (CCSDS) standards: Spacecraft Monitoring and Control (SM&C parameter and action services) Asynchronous Message Service (AMS) Delay / Disruption Tolerant Networking (DTN) Licklider Transmission Protocol (LTP) –Provides reliable space to ground comm –“TCP in space” Bundle Streaming Service (BSS) –Provides a real-time “as-is” data stream, non-reconstituted –Provides a “cleaned up” data stream, after missing data packets have been automatically detected and retransmitted by LTP CCSDS File Delivery Protocol (cfdp) –Provides reliable file transfer in the space environment Raise the SM&C / AMS / DTN / LTP technical readiness levels Promote the acceptance and application of these standardized protocols, which will increase center-to-center interoperability and lower per-mission costs.

5. 5CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 Multi-Control-Center iPAS Overview Telemetry Command MPCV Hardware / Software iPAS Lab, JSC Bldg. 29 (Green) DSN Operations Center JPL Protocol Test Lab (Yellow) OTF, JSC Bldg. 30JPL HOSC, MSFC (Peach) Simulated Mission: Dock with gateway vehicle in halo orbit about the Earth-Moon L2 point; final 2000 meters

6. 6CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 Control Center Simulations – Operations Technology Facility Flight Computer iPAS Lab, JSC Bldg. 29 DSOC Simulation – JPL PTL (sim Antenna Site) Multi-Control-Center iPAS Telemetry and Command System Communication Environment – datapub2 – iPAS Lab, JSC Bldg. 29 CCSDS Packet to SM&C Converter; SM&C Parameter & Action Provider DTN Onboard AMS Publisher AMS/BP/LTP ION 3.1.3 MSKView Display Control Center #3 SM&C Parameter / Action Consumer DTN UDP/BP/AMS ION 3.1.3 MPCV Core Flight Software Proton/S950 FCs den08 Apposite Space Link Simulator 2% packet Drop rate (downlink) 4 sec. OWLT Packet Record/ Playback CCSDS Space Packets (UDP) den07 DTN Ground AMS Publisher LTP/BP/UDP LTP/BP/STCP LTP/BP/DGR ION 3.1.3 LTP DSNet NISN LTP UDP DSNet AMS MSKView Display Control Center #5 SM&C Parameter / Action Consumer DTN STCP/BP/AMS ION 3.1.3 STCP DSNet AMS MSKView Display Control Center #6 SM&C Parameter / Action Consumer DTN DGR/BP/AMS ION 3.1.3 AMS DGR DSNet Onboard ECLSS Fan

7. 7CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 Bandwidth / Overhead Data Point iPAS test conditions (NON OPTIMIZED!) –iPAS telemetry is primarily 8byte DP floating point –600 parameters –10 Hz data rate SM&C / AMS / BP / LTP throughput: –440 kbps in / 700 kbps out –Processing 65% of input data stream (5 of 6 available APIDs) –700 / (440 *.65) = 2.4 –140% overhead (NON OPTIMIZED!) As payload size increases, overhead will decrease.

8. 8CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 SM&C MSKView

9. 9CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 Multi-Control-Center Demo

10. 10CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 iPAS Bay 2 iPAS Video Using BSS Communication Environment – Data Publisher Workstation, iPAS Bay 2 Control Center Simulation – Operations Technology Facility Axis 214 PTZ Network Camera Motion JPEG to BP Converter DTN BP/LTP MJPEG Missing Frame Detector BSS Realtime VLC Display DTN node 3 LTP/BP/BSS JPL den08 Downlink Emulation 2% packet Drop rate 4 sec. OWLT Motion JPEG HTTP MJPEG Missing Frame Detector BSS Playback VLC Display UDP Realtime Stream UDP Playback Stream (40 seconds back into database) Direct Camera Feed VLC Display BSS Controller

11. 11CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 Bandwidth / Overhead Data Point BP / LTP throughput: –126 kbps in / 128 kbps out –2% overhead

12. 12CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 Bundle Streaming Service Video Demo

13. 13CCSDS Fall 2013 Approved For Public Release via the NASA Science and Technical Information Process DAA 29789 Forward Work (Potential) Add 2-way voice / audio Add service prioritization / Quality of Service Tune parameters to lessen overhead Add Network Management Add video pub/sub capability (using AMS) Add Robotics API Delegate (RAPID) Evaluate h.264 video, rather than Motion jpeg