Status of Delta-DOR Cross-Support Activities at JPL James S. - - PowerPoint PPT Presentation

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Status of Delta-DOR Cross-Support Activities at JPL James S. - - PowerPoint PPT Presentation

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Status of Delta-DOR Cross-Support Activities at JPL James S. Border Jet Propulsion Laboratory Fall 2015 CCSDS Meeting Darmstadt, Germany, November 9-12, 2015 Jet Propulsion Laboratory California Institute of Technology Current Cross-Support

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SLIDE 1

Status of Delta-DOR Cross-Support Activities at JPL

James S. Border Jet Propulsion Laboratory

Fall 2015 CCSDS Meeting Darmstadt, Germany, November 9-12, 2015

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SLIDE 2

Jet Propulsion Laboratory

California Institute of Technology

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Current Cross-Support Activity - 1

CCSDS Meeting, Darmstadt, Germany, November 9-12, 2015

  • JPL/ESA are conducting radio source catalog measurements with

Malargue and NASA/DSN stations

  • At JPL, this work is managed by Radio Source Catalog Group
  • Frequency band is Ka (would like X/Ka)
  • Provides unique southern hemisphere coverage for catalog
  • Good Results; Ka Catalog will soon replace S/X Catalog
  • JPL 810-005 Quasar Catalog is updated ~ 2 years

X-band Catalog was updated in 2014

Ka-band Catalog to be delivered in 2016 (?)

  • JPL InSight mission to Mars in 2016 has a low southern declination

trajectory

Only visible from one DSN baseline for ∆DOR

  • Flight Path Angle depends on the orthogonal direction

NASA requested cross-support from both ESA and JAXA

Both ESA and JAXA have agreed to provide ∆DOR cross-support

  • Tracking schedules now being negotiated
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SLIDE 3

Jet Propulsion Laboratory

California Institute of Technology

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Current Cross-Support Activity - 2

CCSDS Meeting, Darmstadt, Germany, November 9-12, 2015

  • JPL is supporting Hayabusa-2 ∆DOR for cruise and

asteroid rendezvous phase

 X-band ∆DOR during cruise has been high quality  The HYB2 transponder design motivated the generalization of

“DOR Tone Multiplier” from a ratio of small integers to a decimal number

 High accuracy at Ka-band needed for rendezvous phase (2018-

2019)

  • JPL is supporting DOR Tone experiment on PROCYON

through a DSN Technology Demonstration task

 Processing of 8 MHz channels has been difficult  Some consideration required for processing of PN DOR

  • JPL is supporting Akatsuki for Venus Orbit Insertion in

2015

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SLIDE 4

Jet Propulsion Laboratory

California Institute of Technology

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Current Cross-Support Activity - 3

CCSDS Meeting, Darmstadt, Germany, November 9-12, 2015

  • JPL/ISRO have cross-support agreement for Mars Orbiter Mission (MOM)

Entered Mars orbit in September 2014

  • JPL provided DSN S-band ∆DOR during cruise for navigation support
  • Indian Deep Space Network (IDSN) validated for Doppler/Range during

cruise

32m antenna at Bangalore used for deep space tracking

  • JPL and ISRO have been performing one mixed-baseline ∆DOR per week

Measurements made of MOM at S-band from Mars’ orbit

Alternate between Canberra/IDSN and IDSN/Madrid baselines

S/X quasar measurements determined station coordinates to 10 cm

  • DDOR receiver at Bangalore provided by Zodiac Data Systems

One of Cortex product line of receivers

The receiver output is compatible with RDEF spec

Results indicate good performance

50 MHz (or 100 MHz) IF bandwidth preferred over current 40 MHz

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SLIDE 5

Jet Propulsion Laboratory

California Institute of Technology

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Current Cross-Support Activity - 4

CCSDS Meeting, Darmstadt, Germany, November 9-12, 2015

  • DDOR proficiency passes are in progress with ESA and JAXA to

prepare for InSight cross-support

  • Four Maven passes completed with JAXA in 2014

Correlation results are good

Residuals from Navigation Reconstruction show 2 nrad data accuracy (comparable to DSN-DSN)

  • Mixed baseline Hayabusa-2 passes in 2014-2015 also show high

accuracy

  • Three Maven passes completed with ESA in 2014

Correlation results are good

Residuals from Navigation Reconstruction show better than 5 nrad data accuracy (meets InSight requirement)

  • Three ESA-baseline MRO passes completed in 2015

Correlation comparison pending

Navigation validation pending

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SLIDE 6

Jet Propulsion Laboratory

California Institute of Technology

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Open Loop Receiver Upgrades at JPL

CCSDS Meeting, Darmstadt, Germany, November 9-12, 2015

  • WVSR re-delivered in 2015

 For compatibility with DSN “Automatic Link Build”  Fixes offset between digital downconverter channels  Allows decimal representation of DOR Tone multiplier  Other minor improvements

  • New OLR planned for 2017 implementation

 Part of all-digital DSN “Common Platform”  RF sub-band downconverted and digitized

  • X-band is 8200-8600 MHz
  • Ka-band is 31800-32300 MHz

 Same digital IF is fed to both closed-loop and open-loop

processors

 Higher open loop data recording rate is possible

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SLIDE 7

Jet Propulsion Laboratory

California Institute of Technology

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InSight Cross-Support - 1

CCSDS Meeting, Darmstadt, Germany, November 9-12, 2015

  • Three measurement opportunities per day

NNO-CEB with Madrid co-observing

MLG-Goldstone-Canberra

Canberra-Usuda

  • Frequency plan for DSN/ESA observations

4 (2 MHz) channels: +1st DOR, +2nd DOR, Carrier, -1st DOR

  • Frequency plan for DSN/JAXA observations

6 (8 MHz) channels: +1st DOR, +2nd DOR, Carrier, -1st DOR, +3rd Subcarrier, - 2nd DOR

Could use 2 MHz channels rather than 8 MHz ?

  • Frequency plan for DSN/ESA/JAXA observations

6 (2 MHz) channels: +1st DOR, +2nd DOR, Carrier, -1st DOR, +3rd Subcarrier, - 2nd DOR

This plan must be used when the same Canberra pass supports a MLG- Goldstone-Canberra DDOR and a Canberra-Usuda DDOR

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SLIDE 8

Jet Propulsion Laboratory

California Institute of Technology

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InSight Cross-Support - 2

CCSDS Meeting, Darmstadt, Germany, November 9-12, 2015

  • Service Request to be exchanged on DSN SPS web portal
  • ESA to upload NNO-CEB Service Request to

https://spsweb.fltops.jpl.nasa.gov/DDOR/ESA/NSYT/DDORServiceRequest/ESA-ESABaseline/

  • ESA to download MLG Service Request from

https://spsweb.fltops.jpl.nasa.gov/DDOR/JPL/NSYT/DDORServiceRequest/DSN-ESABaseline/

  • JAXA to download UDSC Service Request from

https://spsweb.fltops.jpl.nasa.gov/DDOR/JPL/NSYT/DDORServiceRequest/DSN-JAXABaseline/

  • Processing of Service Request is not automatic at JPL

DDOR engineer downloads CCSDS Service Request from ESA, JAXA

Naming conventions are checked

Frequency plan is stored separately on WVSR

ConfigId is set to specify WVSR frequency plan to be used

CCSDS format Service Request is translated to internal format used by DSN and uploaded to another SPS directory

For (legacy) InSight, separate DDOR input is provided to project sequence team

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SLIDE 9

Jet Propulsion Laboratory

California Institute of Technology

  • Designated Servers have been setup in the DSN

to allow for exchange (push/pull) of raw data files

 Routinely being used for exchange with ISRO and JAXA

  • Data transfer rate with ISRO is 1.4 Mbits/sec
  • Data transfer rate with JAXA of 30-60 Mbits/sec is typical

 Setup for exchange with ESA not yet complete

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InSight Cross-Support - 3

CCSDS Meeting, Darmstadt, Germany, November 9-12, 2015