Overview of laser ranging activities at the Institute of …

[Pages:15]Overview of laser ranging activities at the Institute of Technical Physics (..and related topics)

Wolfgang Riede Active Optical Systems, Institute of Technical Physics German Aerospace Center (DLR), Stuttgart Germany ILRS Technical Workshop Stuttgart, October 21st, 2019

DLR.de ? Chart 2 > Overview of laser ranging activities at DLR-TP > Riede

? Motivation ? Ground stations / sensors ? Modelling

? Global Network Performance ? Laser Material Interaction ? Outlook

DLR.de ? Chart 3 > Overview of laser ranging activities at DLR-TP > Riede

Radial distribution of catalogued orbital objects in LEO

Spatial density 10-9 [km-3]

Space X Starlink 550 km 1584 Space X Starlink VLEO 345 km 7518

500

Space X Starlink 1200 km 2841

OneWeb 1200 km 648..2622

1000

1500

Average orbit height [km]

Constellation Orbit Height # Sats

LEO object statistics

16,000 catalogued objects (LEO)

Reference: ESA Annual Space Environment Report 2018

? 1338 active satellites (LEO) ? 2061 active satellites (all orbits)

Large satellite constellations

SpaceX Starlink (US) 11,943 Sats (60 in orbit as of 24/05/19)

OneWeb (UK) 648 -> 2,622 Sats (6 in orbit as of 27/02/19)

Summed up: 14,565 satellites

Increasingly unstable environment!

2000

DLR.de ? Chart 4 > Overview of laser ranging activities at DLR-TP > Riede

Uhlandsh?he Research Observatory (UFO) ? ILRS Engineering station

Laser Transmitter (fiber coupled)

Receiver telescope aperture 43 cm

Direct Drive Mount

-> miniSLR / STAR-C / MS LART

GLONASS

? Test-bed for new technologies and techniques for satellite laser ranging

? NIR laser wavelength (1064 nm) ? Highly repetitive SLR system (1 kHz / 200

kHz) ? Current status: spectral light curve

measurement ? Operation discontinued in 2021

Technical tour on Thursday, Oct. 24th

DLR.de ? Chart 5 > Overview of laser ranging activities at DLR-TP > Riede

Surveillance sensor (passive-optical staring sensor)

? Smallest object LEO: 0,3 m Megapixel Staring Cam ? FoV: 15?

Encapsulated staring system (APPARILLO)

DLR.de ? Chart 6 > Overview of laser ranging activities at DLR-TP > Riede

Retroreflectors for DLR satellite missions

? DLR Firebird & CubeL missions

? inch CCR for DLR ,,CubeL" mission Far-field measurement setup

CCR for DLR Firebird compact sat

-> Poster Session 3 Nils Bartels:

"Design and qualification of a recessed satellite cornercube retroreflector for ground-based attitude verification via satellite laser ranging"

DLR.de ? Chart 7 > Overview of laser ranging activities at DLR-TP > Riede

miniSLR

? Compact SLR system ? Low cost ground station module ? Space traffic monitoring

? On display poster session room

-> Novel concepts session Daniel Hampf

"The miniSLR system: a standardized solution for routine SLR observations"

P. Wagner / DLR

DLR.de ? Chart 8 > Overview of laser ranging activities at DLR-TP > Riede

Transportable Space Debris Laser Ranging System (STAR-C)

Technical tour on Thursday, Oct. 24th (German Weather Service)

Transfer for field tests

? DLR/Eppler

? 20 ft ISO Container, overall weight 10 tons ? Elevatable platform ? Robust and environmentally shielded ? 50 W on-board commercial laser ? Flexibility in site selection

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