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  1. Article ; Online: Phase stability of photoreceivers in intersatellite laser interferometers.

    Barranco, Germán Fernández / Gerberding, Oliver / Schwarze, Thomas S / Sheard, Benjamin S / Dahl, Christian / Zender, Bernd / Heinzel, Gerhard

    Optics express

    2017  Volume 25, Issue 7, Page(s) 7999–8010

    Abstract: A photoreceiver (PR) is required for the opto-electrical conversion of signals in intersatellite laser interferometers. Noise sources that originate or couple in the PR reduce the system carrier-to-noise-density, which is often represented by its phase ... ...

    Abstract A photoreceiver (PR) is required for the opto-electrical conversion of signals in intersatellite laser interferometers. Noise sources that originate or couple in the PR reduce the system carrier-to-noise-density, which is often represented by its phase noise density. In this work, we analyze the common noise sources in a PR used for space-based interferometry. Additionally, we present the results from the characterization of the PRs in GRACE-FO, a mission which will pioneer intersatellite laser interferometry. The estimated phase noise is shot-noise limited at 10<sup>-4</sup> rad/Hz<sup>1/2</sup> down to 10<sup>-2</sup> Hz, almost 4 orders of magnitude below the instrument top level requirement (0.5 rad/Hz<sup>1/2</sup>). Below 10<sup>-2</sup> Hz, the PR finite phase response noise dominates but the levels still comply with the instrument requirement. The sub-mHz noise levels and the PR electronic noise have been identified as key design factors for the LISA PR.
    Language English
    Publishing date 2017-04-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.25.007999
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The Instrument Design of the DLR Earth Sensing Imaging Spectrometer (DESIS).

    Krutz, David / Müller, Rupert / Knodt, Uwe / Günther, Burghardt / Walter, Ingo / Sebastian, Ilse / Säuberlich, Thomas / Reulke, Ralf / Carmona, Emiliano / Eckardt, Andreas / Venus, Holger / Fischer, Christian / Zender, Bernd / Arloth, Simone / Lieder, Matthias / Neidhardt, Michael / Grote, Ute / Schrandt, Friedrich / Gelmi, Samuele /
    Wojtkowiak, Andreas

    Sensors (Basel, Switzerland)

    2019  Volume 19, Issue 7

    Abstract: Whether for identification and characterization of materials or for monitoring of the environment, space-based hyperspectral instruments are very useful. Hyperspectral instruments measure several dozens up to hundreds of spectral bands. These data help ... ...

    Abstract Whether for identification and characterization of materials or for monitoring of the environment, space-based hyperspectral instruments are very useful. Hyperspectral instruments measure several dozens up to hundreds of spectral bands. These data help to reconstruct the spectral properties like reflectance or emission of Earth surface or the absorption of the atmosphere, and to identify constituents on land, water, and in the atmosphere. There are a lot of possible applications, from vegetation and water quality up to greenhouse gas monitoring. But the actual number of hyperspectral space-based missions or hyperspectral space-based data is limited. This will be changed in the next years by different missions. The German Aerospace Center (DLR) Earth Sensing Imaging Spectrometer (DESIS) is one of the new currently existing space-based hyperspectral instruments, launched in 2018 and ready to reduce the gap of space-born hyperspectral data. The instrument is operating onboard the International Space Station, using the Multi-User System for Earth Sensing (MUSES) platform. The instrument has 235 spectral bands in the wavelength range from visible (400 nm) to near-infrared (1000 nm), which results in a 2.5 nm spectral sampling distance and a ground sampling distance of 30 m from 400 km orbit of the International Space Station. In this article, the design of the instrument will be described.
    Language English
    Publishing date 2019-04-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s19071622
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: In-Orbit Performance of the GRACE Follow-on Laser Ranging Interferometer.

    Abich, Klaus / Abramovici, Alexander / Amparan, Bengie / Baatzsch, Andreas / Okihiro, Brian Bachman / Barr, David C / Bize, Maxime P / Bogan, Christina / Braxmaier, Claus / Burke, Michael J / Clark, Ken C / Dahl, Christian / Dahl, Katrin / Danzmann, Karsten / Davis, Mike A / de Vine, Glenn / Dickson, Jeffrey A / Dubovitsky, Serge / Eckardt, Andreas /
    Ester, Thomas / Barranco, Germán Fernández / Flatscher, Reinhold / Flechtner, Frank / Folkner, William M / Francis, Samuel / Gilbert, Martin S / Gilles, Frank / Gohlke, Martin / Grossard, Nicolas / Guenther, Burghardt / Hager, Philipp / Hauden, Jerome / Heine, Frank / Heinzel, Gerhard / Herding, Mark / Hinz, Martin / Howell, James / Katsumura, Mark / Kaufer, Marina / Klipstein, William / Koch, Alexander / Kruger, Micah / Larsen, Kameron / Lebeda, Anton / Lebeda, Arnold / Leikert, Thomas / Liebe, Carl Christian / Liu, Jehhal / Lobmeyer, Lynette / Mahrdt, Christoph / Mangoldt, Thomas / McKenzie, Kirk / Misfeldt, Malte / Morton, Phillip R / Müller, Vitali / Murray, Alexander T / Nguyen, Don J / Nicklaus, Kolja / Pierce, Robert / Ravich, Joshua A / Reavis, Gretchen / Reiche, Jens / Sanjuan, Josep / Schütze, Daniel / Seiter, Christoph / Shaddock, Daniel / Sheard, Benjamin / Sileo, Michael / Spero, Robert / Spiers, Gary / Stede, Gunnar / Stephens, Michelle / Sutton, Andrew / Trinh, Joseph / Voss, Kai / Wang, Duo / Wang, Rabi T / Ware, Brent / Wegener, Henry / Windisch, Steve / Woodruff, Christopher / Zender, Bernd / Zimmermann, Marcus

    Physical review letters

    2015  Volume 123, Issue 3, Page(s) 31101

    Abstract: The Laser Ranging Interferometer (LRI) instrument on the Gravity Recovery and Climate Experiment (GRACE) Follow-On mission has provided the first laser interferometric range measurements between remote spacecraft, separated by approximately 220 km. ... ...

    Abstract The Laser Ranging Interferometer (LRI) instrument on the Gravity Recovery and Climate Experiment (GRACE) Follow-On mission has provided the first laser interferometric range measurements between remote spacecraft, separated by approximately 220 km. Autonomous controls that lock the laser frequency to a cavity reference and establish the 5 degrees of freedom two-way laser link between remote spacecraft succeeded on the first attempt. Active beam pointing based on differential wave front sensing compensates spacecraft attitude fluctuations. The LRI has operated continuously without breaks in phase tracking for more than 50 days, and has shown biased range measurements similar to the primary ranging instrument based on microwaves, but with much less noise at a level of 1  nm/sqrt[Hz] at Fourier frequencies above 100 mHz.
    Language English
    Publishing date 2015-09-30
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.123.031101
    Database MEDical Literature Analysis and Retrieval System OnLINE

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