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GPS Radio Occultation with CHAMP, GRACE-A, Terrasar-X, and COSMIC: Brief Review of Results from GFZ J
GPS radio occultation with CHAMP, GRACE-A, TerraSAR-X, and COSMIC: Brief review of results from GFZ J. Wickert, G. Beyerle, C. Falck, S. Heise, R. König, G. Michalak, D. Pingel*, M. Rothacher, T. Schmidt, and C. Viehweg GeoForschungsZentrum Potsdam, * Deutscher Wetterdienst Overview Current GPS occultation missions During the last decade ground and space based GNSS techniques for atmospheric/ionospheric remote sensing were established. The currently increasing number of receiver platforms (e.g., extension of regional/global ground networks and additional LEO satellites) together with future additional transmitters (GALILEO, reactivated GLONASS, new signal structures for GPS) will extend the potential of these innovative sounding techniques during the next years. Here, we focus to GPS radio CHAMP GRACE TerraSAR-X occultation and present selected examples of recent GFZ results. The activities include orbit and atmospheric /ionospheric occultation data processing for several satellite mission (CHAMP,GRACE-A, SAC-C, and COSMIC), but also various applications. Data sets from CHAMP, GRACE and COSMIC MetOp COSMIC SAC-C Current GPS radio occultation missions: CHAMP (launch July 15, 2000), GRACE (March 17, 2002), TerraSAR-X (June 15, 2007), MetOp (October 18, 2006), COSMIC (April 15, 2006) and SAC-C(November 21, 2000). Number of daily available vertical atmospheric profiles, derived from CHAMP (left), GRACE (middle), and COSMIC (right, UCAR processing) measurements (note the different scale). COSMIC provides significantly more data compared to CHAMP and GRACE-A. The long-term set from CHAMP is unique (300 km orbit altitude expected in Dec. 2008). Validation of CHAMP with MOZAIC aircraft data Near-real time data from CHAMP and GRACE-A (a) (b) (c) GFZ provides near-real time occultation data (bending angle and refractivity profiles) from CHAMP and GRACE-A using it’s operational ground infrastructure including 2 receiving antennas at Ny Ålesund. -
A Survey and Assessment of the Capabilities of Cubesats for Earth Observation
Acta Astronautica 74 (2012) 50–68 Contents lists available at SciVerse ScienceDirect Acta Astronautica journal homepage: www.elsevier.com/locate/actaastro Review A survey and assessment of the capabilities of Cubesats for Earth observation Daniel Selva a,n, David Krejci b a Massachusetts Institute of Technology, Cambridge, MA 02139, USA b Vienna University of Technology, Vienna 1040, Austria article info abstract Article history: In less than a decade, Cubesats have evolved from purely educational tools to a standard Received 2 December 2011 platform for technology demonstration and scientific instrumentation. The use of COTS Accepted 9 December 2011 (Commercial-Off-The-Shelf) components and the ongoing miniaturization of several technologies have already led to scattered instances of missions with promising Keywords: scientific value. Furthermore, advantages in terms of development cost and develop- Cubesats ment time with respect to larger satellites, as well as the possibility of launching several Earth observation satellites dozens of Cubesats with a single rocket launch, have brought forth the potential for University satellites radically new mission architectures consisting of very large constellations or clusters of Systems engineering Cubesats. These architectures promise to combine the temporal resolution of GEO Remote sensing missions with the spatial resolution of LEO missions, thus breaking a traditional trade- Nanosatellites Picosatellites off in Earth observation mission design. This paper assesses the current capabilities of Cubesats with respect to potential employment in Earth observation missions. A thorough review of Cubesat bus technology capabilities is performed, identifying potential limitations and their implications on 17 different Earth observation payload technologies. These results are matched to an exhaustive review of scientific require- ments in the field of Earth observation, assessing the possibilities of Cubesats to cope with the requirements set for each one of 21 measurement categories. -
The Impact of Satellite Data in the Joint Center for Satellite
The Impact of Satellite Data in the Joint Center for Satellite Data Assimilation John Le Marshall (JCSDA) Director, JCSDA 2004-2007 Lars-Peter Rishojgaard 2007- … Overview • Background • The Challenge • The JCSDA • The Satellite Program • Recent Advances • Impact of Satellite Data • Plans/Future Prospects • Summary CDAS/Reanl vs GFS NH/SH 500Hpa day 5 Anomaly Correlation (20-80 N/S) 90 NH GFS 85 SH GFS NH CDAS/Reanl 80 SH CDAS/Reanl 75 70 65 60 Anomaly Correlation Anomaly Correlation 55 50 45 40 1960 1970 1980 1990 2000 YEAR Data Assimilation Impacts in the NCEP GDAS N. Hemisphere 500 mb AC Z 20N - 80N Waves 1-20 15 Jan - 15 Feb '03 1 0.9 0.8 0.7 0.6 control 0.5 no amsu 0.4 no conv 0.3 Anomaly Correlation 0.2 0.1 0 1234567891011121314151617 Forecast [days] AMSU and “All Conventional” data provide nearly the same amount of improvement to the Northern Hemisphere. Impact of Removing Selected Satellite Data on Hurricane Track Forecasts in the East Pacific Basin 140 120 100 Control No AMSU 80 No HIRS 60 No GEO Wind 40 No QSC 20 Average Track ErrorsAverage [NM] 0 12 24 36 48 Forecst Time [hours] Anomaly correlation for days 0 to 7 for 500 hPa geopotential height in the zonal band 20°-80° for January/February. The red arrow indicate use of satellite data in the forecast model has doubled the length of a useful forecast. The Challenge Satellite Systems/Global Measurements GRACE Aqua Cloudsat CALIPSO TRMM SSMIS GIFTS TOPEX NPP Landsat MSG Meteor/ SAGE GOES-R COSMIC/GPS NOAA/ POES NPOESS SeaWiFS Terra Jason Aura ICESat SORCE WindSAT 5-Order Magnitude -
Passive Microwave Radiometer Channel Selection Based on Cloud and Precipitation Information Content Estimation
475 Passive Microwave Radiometer Channel Selection Based on Cloud and Precipitation Information Content Estimation Sabatino Di Michele and Peter Bauer Research Department Submitted to Q. J. Royal Meteor. Soc. July 2005 Series: ECMWF Technical Memoranda A full list of ECMWF Publications can be found on our web site under: http://www.ecmwf.int/publications/ Contact: [email protected] c Copyright 2005 European Centre for Medium-Range Weather Forecasts Shinfield Park, Reading, RG2 9AX, England Literary and scientific copyrights belong to ECMWF and are reserved in all countries. This publication is not to be reprinted or translated in whole or in part without the written permission of the Director. Appropriate non-commercial use will normally be granted under the condition that reference is made to ECMWF. The information within this publication is given in good faith and considered to be true, but ECMWF accepts no liability for error, omission and for loss or damage arising from its use. Microwave Channel Selection from Precipitation Information Content Abstract The information content of microwave frequencies between 5 and 200 GHz for rain, snow and cloud wa- ter retrievals over ocean and land surfaces was evaluated using optimal estimation theory. The study was based on large datasets representative of summer and winter meteorological conditions over North Amer- ica, Europe, Central Africa, South America and the Atlantic obtained from short-range forecasts with the operational ECMWF model. The information content was traded off against noise that is mainly produced by geophysical variables such as surface emissivity, land surface skin temperature, atmospheric temperature and moisture. The estimation of the required error statistics was based on ECMWF model forecast error statistics. -
Combination of Multi-Satellite Altimetry Data with CHAMP and GRACE Egms for Geoid and Sea Surface Topography Determination
Combination of multi-satellite altimetry data with CHAMP and GRACE EGMs for geoid and sea surface topography determination G.S. Vergos , V.N. Grigoriadis, I.N. Tziavos Department of Geodesy and Surveying, Aristotle University of Thessaloniki, University Box 440, 541 24, Thessalo- niki, Greece, Fax: +30 231 0995948, E-mail: [email protected]. M.G. Sideris Department of Geomatics Engineering, University of Calgary, Abstract. Since the launch of the first altimetric mis- repeating measurements of the sea surface. Such satel- sions a wealth of data for the sea surface has become lites are ERS1, ERS2 and ENVISAT and available and utilized for geoid and sea surface topogra- TOPEX/Poseidon (T/P) with JASON-1. JASON-1 and phy modeling. The data from the gravity field dedicated ENVISAT are the latest on orbit satellites (December satellite missions of CHAMP and GRACE provide a 2001 and March 2002, respectively) and are both set on unique opportunity for combination studies with satel- exact repeat missions (ERM). lite altimetric observations. This study focuses on the This long series of altimetric observations has been combination of data from GEOSAT, ERS1/2, widely used for studies on the determination of MSS Topex/Poseidon, JASON-1 and ENVISAT with Earth models (Andersen and Knudsen 1998; Cazenave et al. Gravity Models (EGMs) generated from CHAMP and 1996), global and regional geoid models (Andritsanos et GRACE data to study the mean sea surface al. 2001; Lemoine et al. 1998; Vergos et al. 2005) as (MSS)/marine geoid in the Mediterranean Sea. Various well as on the recovery of gravity anomalies from al- combination methods, i.e., weighted least squares and timetric measurements (Andersen and Knudsen 1998; least squares collocation are investigated and conclu- Hwang et al. -
Remote Sensing for Drought Monitoring & Impact Assessment
1 Remote Sensing for Drought Monitoring & Impact Assessment: Progress, Past 2 Challenges and Future Opportunities 3 4 Harry West, Nevil Quinn & Michael Horswell 5 Centre for Water, Communities & Resilience; Department of Geography & Environmental 6 Management; University of the West of EnglanD, Bristol 7 8 CorresponDing Author: Harry West ([email protected]) 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 1 24 Remote Sensing for Drought Monitoring & Impact Assessment: Progress, Past 25 Challenges and Future Opportunities 26 27 Abstract 28 Drought is a common hydrometeorological phenomenon anD a pervasive global hazarD. As 29 our climate changes, it is likely that Drought events will become more intense anD frequent. 30 Effective Drought monitoring is therefore critical, both to the research community in 31 Developing an unDerstanDing of Drought, anD to those responsible for Drought management 32 anD mitigation. Over the past 50 years remote sensing has shifteD the fielD away from 33 reliance on traditional site-baseD measurements anD enableD observations anD estimates of 34 key drought-relateD variables over larger spatial anD temporal scales than was previously 35 possible. This has proven especially important in Data poor regions with limiteD in-situ 36 monitoring stations. Available remotely senseD Data proDucts now represent almost all 37 aspects of Drought propagation anD have contributeD to our unDerstanDing of the 38 phenomena. In this review we chart the rise of remote sensing for Drought monitoring, 39 examining key milestones anD technologies for assessing meteorological, agricultural anD 40 hyDrological Drought events. We reflect on challenges the research community has faceD to 41 Date, such as limitations associateD with Data recorD length anD spatial, temporal anD 42 spectral resolution. -
Trade Studies Towards an Australian Indigenous Space Launch System
TRADE STUDIES TOWARDS AN AUSTRALIAN INDIGENOUS SPACE LAUNCH SYSTEM A thesis submitted for the degree of Master of Engineering by Gordon P. Briggs B.Sc. (Hons), M.Sc. (Astron) School of Engineering and Information Technology, University College, University of New South Wales, Australian Defence Force Academy January 2010 Abstract During the project Apollo moon landings of the mid 1970s the United States of America was the pre-eminent space faring nation followed closely by only the USSR. Since that time many other nations have realised the potential of spaceflight not only for immediate financial gain in areas such as communications and earth observation but also in the strategic areas of scientific discovery, industrial development and national prestige. Australia on the other hand has resolutely refused to participate by instituting its own space program. Successive Australian governments have preferred to obtain any required space hardware or services by purchasing off-the-shelf from foreign suppliers. This policy or attitude is a matter of frustration to those sections of the Australian technical community who believe that the nation should be participating in space technology. In particular the provision of an indigenous launch vehicle that would guarantee the nation independent access to the space frontier. It would therefore appear that any launch vehicle development in Australia will be left to non- government organisations to at least define the requirements for such a vehicle and to initiate development of long-lead items for such a project. It is therefore the aim of this thesis to attempt to define some of the requirements for a nascent Australian indigenous launch vehicle system. -
Instruments for Earth Science Measurements
NASA SBIR 2004 Phase I Solicitation E1 Instruments for Earth Science Measurements NASA's Earth Science Enterprise (ESE) is studying how our global environment is changing. Using the unique perspective available from space and airborne platforms, NASA is observing, documenting, and assessing large- scale environmental processes with emphasis on atmospheric composition, climate, carbon cycle and ecosystems, the Earth’s surface and interior, the water and energy cycles, and weather. A major objective of the ESE instrument development programs is to implement science measurement capabilities with small or more affordable spacecraft so development programs can meet multiple mission needs and therefore, make the best use of limited resources. The rapid development of small, low cost remote sensing and in situ instruments is essential to achieving this objective. Consequently, the objective of the Instruments for Earth Science Measurements SBIR topic is to develop and demonstrate instrument component and subsystem technologies that reduce the risk, cost, size, and development time of Earth observing instruments, and enable new Earth observation measurements. The following subtopics are concomitant with this objective and are organized by measurement technique. Subtopics E1.01 Passive Optics Lead Center: LaRC Participating Center(s): ARC, GSFC The following technologies are of interest to NASA in the remote sensing subtopic “passive optics.” Passive optical remote sensing generally requires that deployed devices have large apertures and large throughput. NASA is interested primarily in instrument technologies suitable for aircraft or space flight platforms, and these inherently also prefer low mass, low power, fast measurement times, and a high degree of robustness to survive vibrations in flight or at launch. -
N€WS 'RELEASE NATIONAL AERONAUTICS and SPACE Admln ISTRATION 400 MARYLAND AVENUE, SW, WASHINGTON 25, D.C
https://ntrs.nasa.gov/search.jsp?R=19630002483 2020-03-11T16:50:02+00:00Z b " N€WS 'RELEASE NATIONAL AERONAUTICS AND SPACE ADMlN ISTRATION 400 MARYLAND AVENUE, SW, WASHINGTON 25, D.C. TELEPHONES WORTH 2-4155-WORTH. 3-1110 RELEASE NO. 62-182 MARINER SPACECRAFT Mariner 2, the second of a series of spacecraft designed for planetary exploration,- will be launched within a few days (no earlier than August 17) from the Atlantic Missile Range, Cape Canaveral, Florida, by the National Aeronautics and Space Administration. Mariner 1, launched at 4:21 a.m. (EST) on July 22, 1962 from AMR, was destroyed by the Range Safety Officer after about 290 seconds of flight because of a deviation from the planned flight path. Measures have been taken to correct the difficulties experienced in the Mariner 1 launch. These measures include a more rigorous checkout of the Atlas rate beacon and revision of the data editing equation. The data editing equation Is designed as a guard against acceptance of faulty databy the ground guidance equipment. The Mariner 2 spacecraft and its mission are identical to the first Mariner. Mariner 2 will carry six experiments. Two of these instruments, infrared and microwave radiometers, will make measurements at close range as Mariner 2 flys by Venus and communicate this in€ormation over an interplanetary distance of 36 million miles, Four other experiments on the spacecraft -- a magnetometer, ion chamber and particle flux detector, cosmic dust detector and solar plasma spectrometer -- will gather Information on interplantetary phenomena during the trip to Venus and in the vicinity of the planet. -
An Assessment of Rain “Contamination” in ARM Two
An assessment of rain “contamination” in ARM two-channel microwave radiometer measurements Roger Marchand1, Casey Wall1*, Wei Zhao1 and Maria Cadeddu2 1University of Washington, 2Argonne National Laboratory, *Presenting Author Case 1 Case 3 Motivation! ? !! ✔ ? � ✔ 5000 wet-window flag (open/covered) ! Microwave radiometers (MWRs) are the most commonly used and wet-window flag (open/covered) 1500 3000 accurate instruments ARM has to retrieve cloud liquid water path. open MWR open MWR Unfortunately, MWR data are not easily used in precipitating conditions. 1000 500 There are two reasons for this:" 5000 ) ) 2 1500 " 2 1. The measurements are “contaminated” by water on the MWR radome." 3000 covered! covered! MWR MWR 2. Precipitating particles can scatter microwave radiation, yet traditional 1000 500 MWR retrievals neglect scattering." 5000 " 1500 "We designed an experiment that alleviates the “wet radome” problem. 3000 1000 500 5000 The Experiment! 1500 !! 3000 500 ! Two MWRs were operated side by side in a “scanning” or tip-cal mode. Path (g/m Water Liquid 1000 Liquid Water Path (g/m Path Water Liquid One MWR was placed under a cover that kept the radome dry while still 5000 permitting measurements away from zenith (photograph below). The 1500 other MWR was operated normally, with the radome exposed to the sky. 3000 We refer to these as the “covered” and “open” MWRs, respectively. 1000 500 Coincident measurements from the 17.8 18.2 18.6 19 19.4 19.8 covered and open MWRs are 17.5 18 18.5 19 compared to estimate contamination Hours (UTC) Hours (UTC) Case 2 due to a wet radome. -
Users, Uses, and Value of Landsat Satellite Imagery— Results from the 2012 Survey of Users
Users, Uses, and Value of Landsat Satellite Imagery— Results from the 2012 Survey of Users By Holly M. Miller, Leslie Richardson, Stephen R. Koontz, John Loomis, and Lynne Koontz Open-File Report 2013–1269 U.S. Department of the Interior U.S. Geological Survey i U.S. Department of the Interior SALLY JEWELL, Secretary U.S. Geological Survey Suzette Kimball, Acting Director U.S. Geological Survey, Reston, Virginia 2013 For product and ordering information: World Wide Web: http://www.usgs.gov/pubprod Telephone: 1-888-ASK-USGS For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: http://www.usgs.gov Telephone: 1-888-ASK-USGS Suggested citation: Miller, H.M., Richardson, Leslie, Koontz, S.R., Loomis, John, and Koontz, Lynne, 2013, Users, uses, and value of Landsat satellite imagery—Results from the 2012 survey of users: U.S. Geological Survey Open-File Report 2013–1269, 51 p., http://dx.doi.org/10.3133/ofr20131269. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report. Contents Contents ......................................................................................................................................................... ii Acronyms and Initialisms ............................................................................................................................... -
Operational Aspects of Orbit Determination with GPS for Small Satellites with SAR Payloads Sergio De Florio, Tino Zehetbauer, Dr
Deutsches Zentrum Microwave and Radar Institute für Luft und Raumfahrt e.V. Department Reconnaissance and Security Operational Aspects of Orbit Determination with GPS for Small Satellites with SAR Payloads Sergio De Florio, Tino Zehetbauer, Dr. Thomas Neff Phone: +498153282357, [email protected] Abstract Requirements Scientific small satellite missions for remote sensing with Synthetic Taylor expansion of the phase Φ of the radar signal as a Aperture Radar (SAR) payloads or high accuracy optical sensors, pose very function of time varying position, velocity and acceleration: strict requirements on the accuracy of the reconstructed satellite positions, velocities and accelerations. Today usual GPS receivers can fulfill the 4π 233 Φ==++++()t Rtap ()()01kk apttaptt ()(-) 02030 ()(-) k aptt ()(-) k ο () t accuracy requirements of this missions in most cases, but for low-cost- λ missions the decision for a appropriate satellite hardware has to take into Typical requirements, for 0.5 to 1.0 m image resolution, on account not only the reachable quality of data but also the costs. An spacecraft position vector x: analysis is carried out in order to assess which on board and ground equipment, which type of GPS data and processing methods are most −−242 appropriate to minimize mission costs and full satisfying mission payload x≤≤⋅≤⋅ 15 mmsms x 1.5 10 / x 6.0 10 / (3σ ) requirements focusing the attention on a SAR payload. These are requirements on the measurements, not on the real motion of the satellite Required Hardware Typical Position