Laser ranging
View article: The Global Ecosystem Dynamics Investigation: High-resolution laser ranging of the Earth’s forests and topography
The Global Ecosystem Dynamics Investigation: High-resolution laser ranging of the Earth’s forests and topography Open
Obtaining accurate and widespread measurements of the vertical structure of the Earths forests has been a longsought goal for the ecological community. Such observations are critical for accurately assessing the existing biomass of forests…
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Extending the Global Mass Change Data Record: GRACE Follow‐On Instrument and Science Data Performance Open
Since June, 2018, the Gravity Recovery and Climate Experiment Follow‐On (GRACE‐FO) is extending the 15‐year monthly mass change record of the GRACE mission, which ended in June 2017. The GRACE‐FO instrument and flight system performance ha…
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Soliton microcomb range measurement Open
Miniaturized optical ranging and tracking Light detection and ranging systems are used in many engineering and environmental sensing applications. Their relatively large size and cost, however, tend to be prohibitive for general use in aut…
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In-Orbit Performance of the GRACE Follow-on Laser Ranging Interferometer Open
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 approximatel…
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Superconducting nanowire single photon detector at 532 nm and demonstration in satellite laser ranging Open
Superconducting nanowire single-photon detectors (SNSPDs) at a wavelength of 532 nm were designed and fabricated aiming to satellite laser ranging (SLR) applications. The NbN SNSPDs were fabricated on one-dimensional photonic crystals with…
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The new lunar ephemeris INPOP17a and its application to fundamental physics Open
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Coherent laser ranging for precision imaging through flames Open
Measuring the deformation of building elements engulfed by flames is essential in fire research to improve safety in the event of a fire. Ideally, the measurement system should be non-contact, able to range at the millimeter to meter scale…
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Effective expansion of satellite laser ranging network to improve global geodetic parameters Open
The aim of this study is to find an effective way to expand the ground tracking network of satellite laser ranging on the assumption that a new station is added to the existing network. Realistic numbers of observations for a new station a…
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Lorentz Symmetry Violations from Matter-Gravity Couplings with Lunar Laser Ranging Open
The standard-model extension (SME) is an effective field theory framework aiming at parametrizing any violation to the Lorentz symmetry (LS) in all sectors of physics. In this Letter, we report the first direct experimental measurement of …
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Design and Data Processing of China's First Spaceborne Laser Altimeter System for Earth Observation: GaoFen-7 Open
The GaoFen-7 (GF-7) satellite, which was launched on November 3, 2019, is China's first civilian submeter stereo mapping satellite. The satellite is equipped with the first laser altimeter officially in China for earth observation. Except …
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Theoretical ranging performance model and range walk error correction for photon-counting lidars with multiple detectors Open
Ranging performance is the key indicator for a ranging lidar system, and a theoretical ranging performance model can be used for optimizing systematic parameters when designing a lidar system. The fluctuation of the signal photon numbers i…
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A hybrid approach for recovering high-resolution temporal gravity fields from satellite laser ranging Open
A new approach to recover time-variable gravity fields from satellite laser ranging (SLR) is presented. It takes up the concept of lumped coefficients by representing the temporal changes of the Earth’s gravity field by spatial patterns vi…
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Testing nonlocal gravity with Lunar Laser Ranging Open
We study the impact of the limit on $|\\dot{G}|/G$ from Lunar Laser Ranging on\n"nonlocal gravity", i.e. on models of the quantum effective action of gravity\nthat include nonlocal terms relevant in the infrared, such as the "RR" and "RT"\…
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GRACE Follow‐On Laser Ranging Interferometer Measurements Uniquely Distinguish Short‐Wavelength Gravitational Perturbations Open
We examined the first‐ever laser ranging interferometer (LRI) measurements of inter‐satellite tracking acquired by Gravity Recovery and Climate Experiment (GRACE) Follow‐On satellites. Through direct along‐orbit analysis of instantaneous i…
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Tilt-to-Length Coupling in the GRACE Follow-On Laser Ranging Interferometer Open
The Laser Ranging Interferometer onboard the Gravity Recovery and Climate Experiment Follow-On satellites is the first laser interferometer in space measuring satellite-to-satellite distance variations. One of its main noise sources at low…
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“Time Variable Earth Gravity Field Models From the First Spaceborne Laser Ranging Interferometer" Open
The Gravity Recovery and Climate Experiment Follow‐On (GRACE‐FO), launched May 22, 2018 and collecting science data since June 2018, is extending the 15‐year data record of Earth mass change established by its predecessor GRACE mission (20…
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Systematic Error Mitigation in DORIS‐Derived Geocenter Motion Open
Geocenter motion observation is one of the most demanding applications of high‐precision geodetic techniques. Here a quantitative framework is derived that shows how dominant sources of correlations and modeling issues should be mitigated …
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Recent Progress in Lunar Laser Ranging at Grasse Laser Ranging Station Open
Based on a fully passive space segment, the lunar laser ranging experiment is the last of the Apollo Lunar Surface Experiments Package to operate. Observations from the Grasse lunar laser ranging station have been made on a daily basis sin…
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Benefit of New High-Precision LLR Data for the Determination of Relativistic Parameters Open
Since 1969, Lunar Laser Ranging (LLR) data have been collected by various observatories and analysed by different analysis groups. In the recent years, observations with bigger telescopes (APOLLO) and at infra-red wavelength (OCA) are carr…
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IRNSS Orbit Determination and Broadcast Ephemeris Assessment Open
The Indian Regional Navigation Satellite System (IRNSS) is an emerging satellite based navigation system offering an independent positioning and timing service over India and neighboring regions. Based on satellite laser ranging data colle…
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Comparing GRACE-FO KBR and LRI Ranging Data with Focus on Carrier Frequency Variations Open
The GRACE Follow-On satellite mission measures distance variations between its two satellites in order to derive monthly gravity field maps, indicating mass variability on Earth on a scale of a few 100 km originating from hydrology, seismo…
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Advancement on target ranging and tracking by single-point photon counting lidar Open
Laser tracking with a cooperative target has been widely used in many fields and becomes increasingly important while the non-cooperative target tracking is still a challenge. In this article, a pure laser scanning, ranging and tracking sy…
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Satellite laser ranging at 100 kHz pulse repetition rate Open
Current satellite laser ranging (SLR) systems work at laser repetition rates of some 10 Hz up to about 10 kHz. However, using a laser repetition rate of 100 kHz offers several advantages: First, a laser with lower pulse energy can be used,…
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11.8 Chip-scale electro-optical 3D FMCW lidar with 8μm ranging precision Open
Miniaturized 3D imaging systems with sub-mm precision are of high interest for applications such as high-fidelity 3D copying. 3D cameras that employ light-detection-and-ranging (lidar) units offer better spatial and depth resolution compar…
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C<sub>20</sub> and C<sub>30</sub> Variations From SLR for GRACE/GRACE‐FO Science Applications Open
It is essential that the Satellite Laser Ranging (SLR) estimates of C 20 and C 30 are as reliable as possible for GRACE and GRACE Follow‐on science applications. Experiments in combining SLR and GRACE data indicated that not accounting for…
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The development of the GSFC DORIS contribution to ITRF2014 Open
The NASA GSFC DORIS analysis center has processed data from January 1993 to December 2014 and provided 1141 weekly solutions in the form of normal equations for incorporation into the DORIS solution for ITRF2014. The solution time series, …
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Analysis of GRACE Follow-On Laser Ranging Interferometer Derived Inter-Satellite Pointing Angles Open
Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) was launched on\nMay 22, 2018. It carries the Laser Ranging Interferometer (LRI) as a technology\ndemonstrator that measures the inter-satellite range with nanometer precision\nu…
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Satellite Laser-Ranging as a Probe of Fundamental Physics Open
Satellite laser-ranging is successfully used in space geodesy, geodynamics and Earth sciences; and to test fundamental physics and specific features of General Relativity. We present a confirmation to approximately one part in a billion of…
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Using satellite laser ranging to measure ice mass change in Greenland and Antarctica Open
A least squares inversion of satellite laser ranging (SLR) data over Greenland and Antarctica could extend gravimetry-based estimates of mass loss back to the early 1990s and fill any future gap between the current Gravity Recovery and Cli…
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Polarizability assessments of ion-based optical clocks Open
It is shown that the dynamic differential scalar polarisability of the\n$S_{1/2}-D_{5/2}$ transition in $^{138}$Ba$^+$ can be determined to an\ninaccuracy below $0.5\\%$ across a wide wavelength range\n($\\lambda>700\\,\\mathrm{nm}$). This…