National Aeronautics and Space Administration

www.nasa.gov

  General ICD information for SDRsFor consideration for EDS Development

Sandra JohnsonNASA Glenn Research Center, Cleveland, Ohio

CCSDS Spring SOIS/APPS Working GroupApril 2013

National Aeronautics and Space Administration

www.nasa.gov

Scope/Purpose of PresentationUniqueness for SDRs

2

• Introduce the Space Communication and Navigation (SCaN) Testbed

• Describe the approach used by the SDRs to interface with Avionics (OBC)

• Smart device – processor within SDR – may be as capable as OBC

• EDS would reduce effort to integrate different vendor’s EDS and upgrade system to incorporate new waveforms / applications on the SDR

• Configuration files used to enable flexibility

National Aeronautics and Space Administration

www.nasa.gov 3

SCAN Testbed Mission Research & Technology Objectives

• Develop SDR platform hardware & waveform firmware/software compliant to STRS to TRL-7– Promote development and Agency-wide adoption of

NASA’s SDR Standard, STRS– Flight-like ground EM and other equipment to enable the

development, integration and operations of new SDR software on ISS.

• Validate Future Mission Capabilities– Capability representative of future missions (S, Ka, GPS)– Communication, navigation, networking experiments

SCAN Testbed

• Investigate the application of SDRs to NASA Missions– Mission advantages and unique development/verification/operations aspects– SDR reconfiguration, on-orbit reliability

Launched to ISS on JAXA’s H-II Transfer Vehicle (HTV3) on July 20, 2012

National Aeronautics and Space Administration

www.nasa.gov

General Dynamics• TDRSS S-band

(Tx & Rx)• 1 - Virtex II Qpro

FPGA, 3 M gate• ColdFire microprocessor w/ VxWorks

RTOS• CRAM (Chalcogenide RAM) (4 Mb)STRS• Advance STRS/SDR Platforms to TRL-7• Single standard on SDR and WF

• Compliance verified w/

-tools-inspection-observation

SCaN Testbed SDR Platform DescriptionsHarris• TDRSS Ka-band (Tx &

Rx)• 4 - Virtex IV FPGAs• 1 - GFLOP DSP• AiTech 950 with VxWorks RTOS• Scrubbing ASIC

JPL/L-3 CE• L-band receive (GPS)• TDRSS S-band • 2- Virtex II FPGA

(3 M gates each)• Actel RTAX 2000 • Actel AT697 with SPARC V8 Processor

using RTEMs OS

All SDR tested and flown with TDRSS-compliant waveforms.

National Aeronautics and Space Administration

www.nasa.gov

SCaN Testbed Flight System Connections

National Aeronautics and Space Administration

www.nasa.gov

SOIS Architecture – application to SDRs

6

Radios may make use of all services from Avionics.

National Aeronautics and Space Administration

www.nasa.gov

What is implemented in an SDR?

7

Figure from CCSDS 130.0-G-2 “Overview of Space Communications Protocols

Many experiments demonstrate capabilities across most layers

• Software Defined Radios may implement all layers of the CCSDS stack• Boundary between OBC functions and Transceiver function may change depending on system

National Aeronautics and Space Administration

www.nasa.gov

Process to Date

8

• Reviewed 3 SDR ICDs and developed table with generic ICD type information

• Captured information that might be unique for SDR (vs. hardware SDR)

National Aeronautics and Space Administration

www.nasa.gov

Command & Telemetry Info for EDS

9

National Aeronautics and Space Administration

www.nasa.gov 10

National Aeronautics and Space Administration

www.nasa.gov 11

National Aeronautics and Space Administration

www.nasa.gov 12

National Aeronautics and Space Administration

www.nasa.gov

Typical Telemetry information

13

1. Status (On/Off for controllable component, State (test, idle, running))

2. Software & Firmware version information3. Results of startup tests4. Fault Diagnostic information (number of entries in logs)5. Memory statistics6. Configurable parameters for waveform (data rate, coding

on/off, frequency selected, etc.)7. Waveform status (Carrier lock, etc.)8. Performance (SNR estimate, frame loss, etc.)

Items 6-8 likely to be waveform dependent.

National Aeronautics and Space Administration

www.nasa.gov

Path Forward

14

• For consideration:• Continue to gather ICD-type info for SDR• Design an EDS for an SDR• Implement EDS for an SDR

• Start with hardware (dumb) transceiver?• Support dependent on schedule and availability of

Avionics programmer