UMBC Joint Center for Earth Systems Technology (JCET)
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The Joint Center for Earth Systems Technology (JCET) was formed under a Cooperative agreement between the Earth Science Division of NASA Goddard Space Flight Center (GSFC) and the University of Maryland, Baltimore County (UMBC) in 1995. The JCET family consists of its business staff, students, research faculty, GSFC Sponsors, appointed fellows and affiliated tenured/tenure-track faculty. JCET is an innovative center where these scientists interact in a seamless fashion with the support of an efficient business and administrative unit.
Recent Submissions
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JCET Web Tools for the Assessment of the ILRS Network's Performance
We present, discuss and demonstrate webaccessed tools developed at JCET using the products of the ILRS Analysis and Associate Analysis Centers (AC & AAC) to aid stations, missions and analysts assess the performance of the ... -
Expanded SLR Target Constellation for Improved Future ITRFs
The GGOS-imposed requirements to be met by all geodetic techniques per decade are very stringent: 1 mm position and 0.1 mm/y temporal stability. We are an order of magnitude worse today due to a poor ground segment and ... -
Current Activities and Plans of the GGOS Bureau of Networks and Observations
The GGOS Bureau of Networks and Observations works with the IAG Services (IVS, ILRS, IGS, ID, IGFS, and PSMSL) to advocate for the expansion and upgrade of space geodesy networks for the maintenance and improvement of the ... -
GEOCON: Geodetic System Ties Using a CubeSat Constellation
The accuracy of the Terrestrial Reference Frame (TRF), the foundation for geolocating all Earth Observations, is currently limited by systematic errors in tying together the contributions from the different geodetic ... -
New high-resolution model developed for Earth’s gravitational field
(AGU Pubication, 2006-10-19) -
The Development of the Joint NASA GSFC and the National Imagery and Mapping Agency (NIMA) Geopotential Model EGM96
The NASA Goddard Space Flight Center (GSFC), the National Imagery and Mapping Agency (NIMA), and The Ohio State University (OSU) have collaborated to develop an improved spherical harmonic model of the Earth's gravitational ... -
Tidal Satellite Perturbations and the Lense-Thirring Effect
(The Geodetic Society of Japan, 2001-03-25) -
The terrestrial reference frame and the dynamic Earth
(AGU Pubication, 2012-12-29)As early as the 15th century Swedes noticed that rocks in their harbors were slowly rising out of the sea [Ekman, 1991]. These local observations were not sufficient to distinguish whether the rocks were rising or the sea ... -
Improved mapping functions for atmospheric refraction correction in SLR
(AGU Pubication, 2002-05-24)We present two new mapping functions (MFs) to model the elevation angle dependence of the atmospheric delay for satellite laser ranging (SLR) data analysis. The new MFs were derived from ray tracing through a set of data ... -
Measuring the relativistic perigee advance with Satellite Laser Ranging
(IOP, 2002-07-30)The pericentric advance of a test body by a central mass is one of the classical tests of general relativity. Today, this effect is measured with radar ranging by the perihelion shift of Mercury and other planets in the ... -
The impact of tidal errors on the determination of the Lense-Thirring effect from satellite laser ranging
(World Scientific Publishing, 2018-10-27)The general relativistic Lense–Thirring effect can be detected by means of a suitable combination of orbital residuals of the laser-ranged LAGEOS and LAGEOS II satellites. While this observable is not affected by the orbital ... -
Atmospheric Refraction at Optical Wavelengths: Problems and Solutions
(NASA, 2002-10)Atmospheric refraction is an important accuracy-limiting factor in the application of satellite laser ranging (SLR) to high-accuracy applications. The modeling of that source of error in the analysis of SLR data comprises ... -
The SLR Contribution to the ITRF Monitoring the Origin of the TRF with Space Geodetic Techniques
The origin of the Terrestrial Reference System (TRS) is realized through the adopted coordinates of its defining set of positions and velocities at epoch, constituting the conventional Terrestrial Reference Frame (TRF). ... -
European radar altimeter calibration and sea-level monitoring site for Jason-1 and Envisat at the island of Gavdos, Crete, Greece
(SPIE, 2003-02-14)An absolute sea level monitoring and altimeter calibration permanent facility is being established on the isle of Gavdos, south of the island of Crete, Greece. This calibration facility has been chosen because Gavdos is ... -
On the possibility of measuring relativistic gravitational effects with a LAGEOS-LAGEOS II-OPTIS-mission
(IOP, 2004-03-23)A space mission, OPTIS, has been proposed for testing the foundations of special relativity and post-Newtonian gravitation in the field of the Earth. The constraints posed on the original OPTIS orbital geometry would allow ... -
High‐accuracy zenith delay prediction at optical wavelengths
(AGU Pubication, 2004-07-16)A major limitation in accuracy in modern satellite laser ranging is the modeling of atmospheric refraction. Recent improvements in this area include the development of mapping functions to project the atmospheric delay ... -
FTLRS POSITIONING FOR THE EU/NASA ALTIMETER CALIBRATION PROJECT GAVDOS
The Eastern Mediterranean area is one of great interest for its intense tectonic activity as well as for its regional oceanography. Recent observations convincingly demonstrated the importance of the area for regional ... -
MULTIWAVELENGTH REFRACTION MODELING IMPROVEMENTS FOR SLR OBSERVATIONS
Atmospheric refraction is an important accuracy-limiting factor in the use of satellite laser ranging (SLR) for high-accuracy science applications. In most of these applications, and particularly for the establishment and ...
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