The Next Generation of Satellite Laser Ranging Systems Matthew Wilkinson Sgf, Herstmonceux Journal of Geodesy
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International Laser Ranging Service (ILRS)
The International Laser Ranging Service (ILRS) http://ilrs.gsfc.nasa.gov/ Chairman of the Governing Board: G. Appleby (Great Britain) Director of the Central Bureau: M. Pearlman (USA) Secretary: C. Noll (USA) Analysis Coordinator: E. C. Pavlis (USA) Development ranging and ranging to the Lunar Orbiter, with plans to extend ranging to interplanetary missions with optical Satellite Laser Ranging (SLR) was established in the mid- transponders. 1960s, with early ground system developments by NASA and CNES. Early US and French satellites provided laser Mission targets that were used mainly for inter-comparison with other tracking systems, refinement of orbit determination The ILRS collects, merges, analyzes, archives and techniques, and as input to the development of ground distributes Satellite Laser Ranging (SLR) and Lunar Laser station fiducial networks and global gravity field models. Ranging (LLR) observation data sets of sufficient accuracy Early SLR brought the results of orbit determination and to satisfy the GGOS objectives of a wide range of station positions to the meter level of accuracy. The SLR scientific, engineering, and operational applications and network was expanded in the 1970s and 1980s as other experimentation. The basic observable is the precise time- groups built and deployed systems and technological of-flight of an ultra-short laser pulse to and from a improvements began the evolution toward the decimeter retroreflector-equipped satellite. These data sets are used and centimeter accuracy. Since 1976, the main geodetic by the ILRS to generate a number of fundamental added target has been LAGEOS (subsequently joined by value products, including but not limited to: LAGEOS-2 in 1992), providing the backbone of the SLR • Centimeter accuracy satellite ephemerides technique’s contribution to the realization of the • Earth orientation parameters (polar motion and length of day) International Terrestrial Reference Frame (ITRF). -
Space Geodesy and Satellite Laser Ranging
Space Geodesy and Satellite Laser Ranging Michael Pearlman* Harvard-Smithsonian Center for Astrophysics Cambridge, MA USA *with a very extensive use of charts and inputs provided by many other people Causes for Crustal Motions and Variations in Earth Orientation Dynamics of crust and mantle Ocean Loading Volcanoes Post Glacial Rebound Plate Tectonics Atmospheric Loading Mantle Convection Core/Mantle Dynamics Mass transport phenomena in the upper layers of the Earth Temporal and spatial resolution of mass transport phenomena secular / decadal post -glacial glaciers polar ice post-glacial reboundrebound ocean mass flux interanaual atmosphere seasonal timetime scale scale sub --seasonal hydrology: surface and ground water, snow, ice diurnal semidiurnal coastal tides solid earth and ocean tides 1km 10km 100km 1000km 10000km resolution Temporal and spatial resolution of oceanographic features 10000J10000 y bathymetric global 1000J1000 y structures warming 100100J y basin scale variability 1010J y El Nino Rossby- 11J y waves seasonal cycle eddies timetime scale scale 11M m mesoscale and and shorter scale fronts physical- barotropic 11W w biological variability interaction Coastal upwelling 11T d surface tides internal waves internal tides and inertial motions 11h h 10m 100m 1km 10km 100km 1000km 10000km 100000km resolution Continental hydrology Ice mass balance and sea level Satellite gravity and altimeter mission products help determine mass transport and mass distribution in a multi-disciplinary environment Gravity field missions Oceanic -
Educator's Guide: Orion
Legends of the Night Sky Orion Educator’s Guide Grades K - 8 Written By: Dr. Phil Wymer, Ph.D. & Art Klinger Legends of the Night Sky: Orion Educator’s Guide Table of Contents Introduction………………………………………………………………....3 Constellations; General Overview……………………………………..4 Orion…………………………………………………………………………..22 Scorpius……………………………………………………………………….36 Canis Major…………………………………………………………………..45 Canis Minor…………………………………………………………………..52 Lesson Plans………………………………………………………………….56 Coloring Book…………………………………………………………………….….57 Hand Angles……………………………………………………………………….…64 Constellation Research..…………………………………………………….……71 When and Where to View Orion…………………………………….……..…77 Angles For Locating Orion..…………………………………………...……….78 Overhead Projector Punch Out of Orion……………………………………82 Where on Earth is: Thrace, Lemnos, and Crete?.............................83 Appendix………………………………………………………………………86 Copyright©2003, Audio Visual Imagineering, Inc. 2 Legends of the Night Sky: Orion Educator’s Guide Introduction It is our belief that “Legends of the Night sky: Orion” is the best multi-grade (K – 8), multi-disciplinary education package on the market today. It consists of a humorous 24-minute show and educator’s package. The Orion Educator’s Guide is designed for Planetarians, Teachers, and parents. The information is researched, organized, and laid out so that the educator need not spend hours coming up with lesson plans or labs. This has already been accomplished by certified educators. The guide is written to alleviate the fear of space and the night sky (that many elementary and middle school teachers have) when it comes to that section of the science lesson plan. It is an excellent tool that allows the parents to be a part of the learning experience. The guide is devised in such a way that there are plenty of visuals to assist the educator and student in finding the Winter constellations. -
Systematic Errors Between SLR and GNSS Due to the Omission of Atmospheric Pressure Loading
Geophysical Research Abstracts Vol. 20, EGU2018-208-1, 2018 EGU General Assembly 2018 © Author(s) 2017. CC Attribution 4.0 license. Systematic errors between SLR and GNSS due to the omission of atmospheric pressure loading Grzegorz Bury and Krzysztof Sosnica´ Wroclaw University of Environmental and Life Sciences, Institute of Geodesy and Geoinformatics, The Faculty of Environmental Engineering and Geodesy, Wrocław, Poland ([email protected]) Satellite Laser Ranging (SLR) is a precise space geodetic technique that contributes to Global Geodetic Observing System (GGOS) by providing e.g., the origin and the scale of the International Terrestrial Reference Frame, station coordinates, Earth rotation parameters, standard gravitational parameter – GM, and low-degree spherical harmonics of the Earth’s gravity field. Currently, all new active navigation satellites are equipped with laser retroreflectors for range measurements. Due to that fact, one can determine SLR-derived parameters based on the range measurements to multi-GNSS constellations: Galileo, GLONASS, BeiDou and QZSS. However, a full consistency between both SLR and GNSS techniques is required to obtain reliable global geodetic parameters. The current requirement imposed by GGOS demands a precise reference frame that is stable-in-time and accurate at the level of 1 mm. Atmospheric pressure loading (APL) plays an important role in precise space geodesy, due to the fact that it causes displacements of the geodetic stations of magnitude at the level of 1 cm both in vertical and horizontal directions. As a result, APL corrections should be considered if one would like to fulfill requirements imposed by GGOS. SLR is especially affected by APL due to the fact that range measurements can be performed only during cloudless conditions, which coincide with the high atmospheric pressure that deforms the Earth’s crust. -
Optical Satellite Communication Toward the Future of Ultra High
No.466 OCT 2017 Optical Satellite Communication toward the Future of Ultra High-speed Wireless Communications No.466 OCT 2017 National Institute of Information and Communications Technology CONTENTS FEATURE Optical Satellite Communication toward the Future of Ultra High-speed Wireless Communications 1 INTERVIEW New Possibilities Demonstrated by Micro-satellites Morio TOYOSHIMA 4 A Deep-space Optical Communication and Ranging Application Single photon detector and receiver for observation of space debris Hiroo KUNIMORI 6 Environmental-data Collection System for Satellite-to-Ground Optical Communications Verification of the site diversity effect Kenji SUZUKI 8 Optical Observation System for Satellites Using Optical Telescopes Supporting safe satellite operation and satellite communication experiment Tetsuharu FUSE 10 Development of "HICALI" Ultra-high-speed optical satellite communication between a geosynchronous satellite and the ground Toshihiro KUBO-OKA TOPICS 12 NICT Intellectual Property -Series 6- Live Electrooptic Imaging (LEI) Camera —Real-time visual comprehension of invisible electromagnetic waves— 13 Awards 13 Development of the “STARDUST” Cyber-attack Enticement Platform Cover photo Optical telescope with 1 m primary mirror. It receives data by collecting light from sat- ellites. This was the main telescope used in experiments with the Small Optical TrAn- sponder (SOTA). This optical telescope has three focal planes, a Cassegrain, a Nasmyth, and a coudé. The photo in the upper left of this page shows SOTA mounted in a 50 kg-class micro- satellite. In a world-leading effort, this was developed to conduct basic research on technology for 1.5-micron band optical communication between low-earth-orbit sat- ellite and the ground and to test satellite-mounted equipment in a space environment. -
A Review of the Lunar Laser Ranging Technique and Contribution of Timing
Review Article Timing systems for lunar laser ranging Page 1 of 9 A review of the lunar laser ranging technique and AUTHORS: contribution of timing systems Cilence Munghemezulu1,2 Ludwig Combrinck1,2 Joel O. Botai3 The lunar laser ranging (LLR) technique is based on the two-way time-of-flight of laser pulses from an earth station to the retroreflectors that are located on the surface of the moon. We discuss the ranging technique AFFILIATIONS: and contribution of the timing systems and its significance in light of the new LLR station currently under 1Centre for Geoinformation Science, Department of development by the Hartebeesthoek Radio Astronomy Observatory (HartRAO). Firstly, developing the LLR Geography, Geoinformatics station at HartRAO is an initiative that will improve the current geometrical network of the LLR stations and Meteorology, University of Pretoria, Pretoria, South Africa which are presently concentrated in the northern hemisphere. Secondly, data products derived from the 2Space Geodesy Programme, LLR experiments – such as accurate lunar orbit, tests of the general relativity theory, earth–moon dynamics, Hartebeesthoek Radio interior structure of the moon, reference frames, and station position and velocities – are important in better Astronomy Observatory, understanding the earth–moon system. We highlight factors affecting the measured range such as the effect Krugersdorp, South Africa 3South African Weather Service, of earth tides on station position and delays induced by timing systems, as these must be taken into account Pretoria, South Africa during the development of the LLR analysis software. HartRAO is collocated with other fundamental space geodetic techniques which makes it a true fiducial geodetic site in the southern hemisphere and a central point CORRESPONDENCE TO: Cilence Munghemezulu for further development of space-based techniques in Africa. -
Lunar Laser Ranging: the Millimeter Challenge
REVIEW ARTICLE Lunar Laser Ranging: The Millimeter Challenge T. W. Murphy, Jr. Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0424, USA E-mail: [email protected] Abstract. Lunar laser ranging has provided many of the best tests of gravitation since the first Apollo astronauts landed on the Moon. The march to higher precision continues to this day, now entering the millimeter regime, and promising continued improvement in scientific results. This review introduces key aspects of the technique, details the motivations, observables, and results for a variety of science objectives, summarizes the current state of the art, highlights new developments in the field, describes the modeling challenges, and looks to the future of the enterprise. PACS numbers: 95.30.Sf, 04.80.-y, 04.80.Cc, 91.4g.Bg arXiv:1309.6294v1 [gr-qc] 24 Sep 2013 CONTENTS 2 Contents 1 The LLR concept 3 1.1 Current Science Results . 4 1.2 A Quantitative Introduction . 5 1.3 Reflectors and Divergence-Imposed Requirements . 5 1.4 Fundamental Measurement and World Lines . 10 2 Science from LLR 12 2.1 Relativity and Gravity . 12 2.1.1 Equivalence Principle . 13 2.1.2 Time-rate-of-change of G ....................... 14 2.1.3 Gravitomagnetism, Geodetic Precession, and other PPN Tests . 14 2.1.4 Inverse Square Law, Extra Dimensions, and other Frontiers . 16 2.2 Lunar and Earth Physics . 16 2.2.1 The Lunar Interior . 16 2.2.2 Earth Orientation, Precession, and Coordinate Frames . 18 3 LLR Capability across Time 20 3.1 Brief LLR History . -
The Attic Nights of Aulus Gellius
,.J: - f^^^- \ ^ xxV^Jr^^ EEx Libris K. OGDEN Digitized by tine Internet Arciiive in 2007 with funding from IVIicrosoft Corporation http://www.archive.org/details/atticniglitsofaul02gelliala THE ATTIC NIGHTS O P AULUS GELLIUS TRANSLATED INTO ENGLISH, By THE Rev. W. B E L O E, f. s. a. XRANSLAro R OF HERODOTUS, &C. IN THREE VOLUMES. V O L. U. LONDON: I'RINTKn FO. ;. ;0HN50N. ST. p.ul's CHU^CH-VA.o. M Dec XCV. Annex PR £5-. THE ATTIC NIGHTS O F AULUS GELLIUS. BOOK VL Chap, I. The reply of Chryjippus to thoje who denied a Pro* vidence. ' ^r'HE Y who think that the world was not pro- duced on account of the Deity and of man, and deny that human affairs are governed by Providence, think * The beginning of this chapter was wanting in all the editions with which I am acquainted ; but I have reftored it from Laftantius's Epitome of his Divine Inftitutions, Chap. 29. It is a whimfical circumftance enough, that the greater part of this very Epitome ftiould have lain hid till the pre- fent century. St. Jerome, in his Catalogue of Ecclefiailical Writers, fpeaking of Laflaatius, fays, " Habemus ejus In- ftitiitionum Divinarum adverfus gentes libros feptem eitEpi- VOL. II, B tome ; « THE ATTIC NIGHTS think that they urge a 'powerful argument when they offerti that if there were a Providence there would he no evils. For nothings they affirm., can be lefs conftfi^ ent with a Providence, than that in that world, oH account of which the Deity is /aid to have created man, there fhould exijl fo great a number of cala- mities and evils. -
The Southern Ocean Clouds,Radiation, Aerosol Transport Experimental Study
THE SOUTHERN OCEAN CLOUDS, RADIATION, AEROSOL TRANSPORT EXPERIMENTAL STUDY THE SOCRATES PLANNING TEAM Roj Marchand, Robert Wood, Chris Bretherton, University of Washington, Seattle, Washington Greg McFarquhar, University of Illinois, Urbana, Illinois Alain Protat, Bureau of Meteorology, Melbourne, Australia Patricia Quinn, NOAA PMEL, Seattle Steven Siems and Christian Jakob, Monash University, Melbourne, Australia Simon Alexander, Australian Antarctic Division, Kingston, Tasmania, Australia Bob Weller, Woods Hole Oceanographic Institute, Woods Hole, Massachusetts SOCRATES WORKSHOP PARTICIPANTS AND CONTRIBUTORS Steve Ghan, Chris Hostetler, Gijs de Boer, Jay Mace, Pavlos Kollias, Richard Moore, Theodore Wilson, Dennis Hartmann, Jorgen Jensen, Jennifer Kay, Lynn Russell, Jacob Scheff, Elizabeth Maroon, Susannah Burrows, Sara Tucker, Jeff Stith, James Hudson, Joellen Russell, Yan Feng, Paul DeMott, Tom Lachlan‐Cope, Paulo Ceppi, Daniel Grosvenor, Daniel McCoy, Nicholas Meskhidze, Chris Fairall, Sarah Gille, Tim Bates, Cassandra Gaston, Erica Dolinar, Ryan Stanfield, Keith Williams, Alejandro Bodas‐Salcedo, Bob Rauber, Mike Harvey, Antony Clarke, Monica Orellana, Andreas Muhlbauer, Lorenzo Polvani, Yongxiang Hu, Scott Collis, Anna Gannet Hallar, Ying Li, Adrian James McDonald, Kalli Furtado, Gregory Roberts, Ann Fridlind, Andrew Ackerman, Carol Clayson, Benjamin Hillman 1 Preamble The Southern Ocean (SO) is the stormiest place on earth, buffeted by winds and waves that circle the ice of Antarctica, sheathed in clouds that mantle a dynamic ocean with rich ecosystems, and remote from most human influences. It influences the atmospheric and oceanic circulation of the entire southern hemisphere and beyond. The remoteness from anthropogenic and natural continental aerosol sources makes the SO a unique testbed for our understanding of cloud‐aerosol interaction, both for liquid and ice clouds, and the role of marine biogenic aerosols and their precursors. -
Determination of Global Geodetic Parameters Using Satellite Laser Ranging Measurements to Sentinel-3 Satellites
remote sensing Article Determination of Global Geodetic Parameters Using Satellite Laser Ranging Measurements to Sentinel-3 Satellites Dariusz Strugarek 1,* , Krzysztof So´snica 1 , Daniel Arnold 2 , Adrian Jäggi 2, Radosław Zajdel 1 , Grzegorz Bury 1 and Mateusz Drozd˙ zewski˙ 1 1 Institute of Geodesy and Geoinformatics, Wrocław University of Environmental and Life Sciences; 50-375 Wrocław, Poland; [email protected] (K.S.); [email protected] (R.Z.); [email protected] (G.B.); [email protected] (M.D.) 2 Astronomical Institute, University of Bern; Sidlerstrasse 5, 3012 Bern, Switzerland; [email protected] (D.A.); [email protected] (A.J.) * Correspondence: [email protected] Received: 29 July 2019; Accepted: 26 September 2019; Published: 30 September 2019 Abstract: Sentinel-3A/3B (S3A/B) satellites are equipped with a number of precise instruments dedicated to the measurement of surface topography, sea and land surface temperatures and ocean and land surface color. The high-precision orbit is guaranteed by three instruments: Global Positioning System (GPS) receiver, laser retroreflector dedicated to Satellite Laser Ranging (SLR) and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) antenna. In this article, we check the possibility of using SLR observations and GPS-based reduced-dynamic orbits of active S3A/B satellites for the determination of global geodetic parameters, such as geocenter motion, Earth rotation parameters (ERPs) and the realization of the terrestrial reference frame, based on data from 2016-2018. The calculation process was preceded with the estimation of SLR site range biases, different network constraining tests and a different number of orbital arcs in the analyzed solutions. -
Satellite Laser Ranging
Krzysztof Sośnica Determination of Precise Satellite Orbits and Geodetic Parameters using Satellite Laser Ranging Public defense of the doctoral dissertation 7Th of April, 2014 University of Bern, Switzerland Astronomical Institute University of Bern Table of contents Introduction: of April 2014 . th Overview on Satellite Geodesy . Observation Principle of Satellite Laser Ranging Precise Orbit Determination of SLR Satellites . Satellite Orbit Perturbations . Non-Gravitational Perturbations Determination of Geodetic Parameters – Results . SLR Station Coordinates . Geocenter Coordinates using Satellite Laser Ranging, University of Bern, 7 using Satellite Laser University of Ranging, . Earth gravity field & Earth Rotation Parameters (ERPs) nicaPrecise K.:Determination of Satellite Geodetic Parameters Orbits and ś So Conclusions Slide 2 Astronomical Institute University of Bern Three Pillars of Satellite Geodesy Geometry Determination of geometrical three- of April 2014 th dimensional positions and velocities (in global, regional, and local reference frames), Gravity Geometry Rotation Determination of the Earth's gravity field Gravity and its temporal variations, Rotation Modeling and observing of geodynamical phenomena (tectonic plates, loading crustal deformations) including the rotation and using Satellite Laser Ranging, University of Bern, 7 using Satellite Laser University of Ranging, orientation of the Earth (polar motion, Length-of-day, precession and nutation). nica K.:Determination of Precise K.:Determination of Satellite Geodetic -
Lunar Laser Ranging: a Small System Approach
Lunar Laser Ranging: A small system approach J. J. Eckl1, K. U. Schreiber2, A. Leidig1, T. Bachem1, A. Neidhardt2, T. Schüler1 1 Federal Agency for Cartography and Geodesy, Geodetic Observatory Wettzell, Germany 2 Technical University of Munich, Geodetic Observatory Wettzell, Germany Abstract. For many decades Lunar Laser Ranging was confined to the single photon detection regime, despite of the application of large telescopes and high power pulse lasers. This means there were only very few stations capable of tracking the moon and the data yield was sparse. When the Apache Point Lunar Laser Ranging facility took up operations, it was the first station that routinely operated with a comfortable link margin, mostly owing to a very large telescope aperture and the high mountain location of the observatory. In contrast, the Wettzell Laser Ranging System is situated at a low elevation of 570 m at a much higher latitude of 49.14° and the telescope aperture diameter is almost 5 times smaller. However, modern high quantum efficiency fast detectors, as well as the operation in the near infrared regime at the 1.06 µm wavelength domain are compensating some of these disadvantages. It allows us to pioneer the application of ultra short laser pulses (10 ps) on the moon, where usually lasers of several hundred ps of pulse width are used. We can now resolve the effective depth of the APOLLO 15 reflector array, which changes as a result of the lunar libration. Owing to the infrared laser frequency, it has become also possible to operate the LLR system during the day time.