Performance and Prediction of SLR Tracking on Regional ... · Performance and Prediction of SLR...
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Performance and Prediction of SLR Tracking on
Regional GNSS Constellations
Mark A DavisDr. Linda Thomas, Dr. Harris Burris
Code 8123 and 8125US Naval Research Laboratory
Washington, DC 20375
November 5‐9, 2012International Technical Laser Workshop 2012 (ITLW‐12)
“Satellite, Lunar and Planetary Laser Ranging: characterizing the space segment”Frascati National Laboratories of the INFN‐LNF
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Regional Augmentation Constellations
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2012 Tracking Data for QZSS and Compass – Projected for IRNSS
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QZSS / Compass / IRNSSConstellation Orbit
Inclination (deg)Cube ApertureDiameter (mm)
Cube Spoiling(Arcsec)
Cube Height(mm)
# of Cubes
ETS‐8 0 40.64 0.5” 28.74 36
QZSS 43 40.64 0.8” +/‐ 0.5”
28.74 56
Compass GEO 0 33.0 0.6+/‐ 0.3”
24.0 90
Compass IGEO 55 33.0 0.6+/‐ 0.3”
24.0 90
IRNSS GEO 0 38.0 0.0+/‐ 0.5”
29.70 40
IRNSS IGEO 29 38.0 0.0 +/‐ 0.5”
29.70 40
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*ALL cube specs from the Mission Support Request form Documentation or references on ILRS website
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Annulus of InterestVelocity aberration for all incidence angles
• ETS8/QZSS– 16.5 to 20 urad
• Compass– 18 to 21 urad
• IRNSS– 17.5 to 21.5 urad
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Real Tracking and Planned Annulus where array is being utilized
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Zemax derived Cross Sections
• Complete new set of FFDP generated for these cases– 64 bit version of ZEMAX and analysis tools– Explicit off normal incident angles (no rules of thumb)
• Linear and Circular plots for the AVERAGE performance in annulus of interest– single cube cross section contribution estimate– array cross section estimate– Min/Max in annulus error bars included on plots
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Horizontal Polarization:Individual Cube Contribution
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Many different Realizations all using TIR principals
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Array Cross Section EstimatesHorizontal Polarization
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Explicit Incident Angle – with Peak in annulus Min and Max
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Circular Polarization:Individual Cube Contribution
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Array Cross Section EstimatesCircular Polarization
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Explicit Incident Angle – with Peak in annulus Min and Max
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Data on Constellations Today – 6 Pane PlotsKoganei‐7308 Example
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Elevation angle vsreported obs in NP /
computed fires
Elevation angle vsReported obs in
NP
Elevation vs Link Budget # Photoelectrons per fire
Sun Elevation (‐ is night, + is day)
vsangle between SV
and SUN(BIG X is 30 deg off
SUN)DAY
NIGHT
Elevation vs Link Budget Accuracy
Perfect model == 1.0
Elevation vs incident angle (from Nadir)
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Yarragadee Case
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Extension to the IRNSS Constellation
Davis Nov 2012 12Hz Rate Stations
Relative performance is expected to be very similar (on average)
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Extension to the IRNSS Constellation
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Faster Rate Stations or Lower Energy
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Conclusion
• Direct comparison of performance shown for the link budgets– Extrapolation for what to expect on future Regional Constellations
• All 3 constellations are targeting the same cross section– Vastly different cube configurations and spoiling have been implemented
• All 2012 Contributor Models are included in Backups– Some model improvements if better divergence, weather, NP duration (full
300 sec or truncated?), exact shots fired were available, N‐sigma editing – Is there any tilt on the Inclined COMPASS tray?– Relative performance can be directly extracted
• Target Signature– Is there enough points per normal point for removal?– Is there enough data for accurate OD?
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BACKUPS
Current Constellation Performance
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Beijing ‐ 7249
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Chang Chun ‐ 7237
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Grasse 7845
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Katzively 1893
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Koganei 7308
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Matera 7941
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Mt Stromlo 7825
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Shanghai 7821
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Simeiz 1873
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Tanegashima 7358
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Wettzell 8834
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Yarragadee 7090
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BACKUPS
Current Performance and Future Regional Link Estimations
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Beijing 7249
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Chang Chun 7237
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Grasse 7845
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Katzively 1893
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Koganei 7308
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Matera 7941
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Mt Stromlo 7825
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Shanghai 7821
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Simeiz 1873
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Tanegashima 7358
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Wettzell 8834
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Yarragadee 7090
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BACKUPS
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Horizontal Polarization – Other GNSS
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Horizontal Polarization – Other GNSSIndividual Cube Contribution
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Circular Polarization – Other GNSS
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Circular Polarization – Other GNSSIndividual Cube Contribution
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