scholarly journals An Improved Polar Motion and Earth Rotation Monitoring Service Using Radio Interferometry

1979 ◽  
Vol 82 ◽  
pp. 191-197 ◽  
Author(s):  
William E. Carter ◽  
Douglas S. Robertson ◽  
Michael D. Abell
Keyword(s):  
Earth Rotation ◽  
Polar Motion ◽  
Processing System ◽  
Geodetic Survey ◽  
National Geodetic Survey ◽  
Radio Interferometry ◽  
Station Network ◽  
Data Acquisition And Processing ◽  
Monitoring Service ◽  
New Generation

The National Geodetic Survey (NGS) of the National Ocean Survey (NOS), a component of the National Oceanic and Atmospheric Administration has begun a project to establish and operate a 3-station network of permanent observatories to monitor polar-motion and Earth rotation (UT1) by radio interferometric observations of quasars. The project designation is POLARIS (POLar-motion Analysis by Radio Interferometric Surveying).The POLARIS observatories will be equipped with a new generation of instrumentation and software, the Mark III data acquisition and processing system currently under development by a multi-organizational team.

scholarly journals The Celestial System of the International Earth Rotation Service

1990 ◽  
Vol 141 ◽  
pp. 119-128
Author(s):  
E.F. Arias ◽  
M. Feissel
Keyword(s):  
Earth Rotation ◽  
Geodetic Survey ◽  
Radio Sources ◽  
National Geodetic Survey ◽  
International Earth Rotation Service ◽  
International Earth Rotation ◽  
Goddard Space Flight Center ◽  
Celestial Pole ◽  
Conventional Models ◽  
Celestial Reference Frame

The celestial system of the International Earth Rotation Service (IERS) is materialized by the J2000.0 positions of more than 250 extragalactic compact radio sources observed by VLBI. The source coordinates are evaluated from the combination of individual celestial frames obtained by the Goddard Space Flight Center, the Jet Propulsion Laboratory and the U.S. National Geodetic Survey.The combination model and the maintenance algorithm are described. To free the IERS celestial frame from inconsistencies due to the inaccuracy of the IAU conventional models for precession and nutation, it is implemented on individual frames which have been obtained in parallel to the adjustment of corrections to the direction of the celestial pole.The IERS celestial reference frame is consistent with FK5 at a few milliarcsecond level. To be made denser and more accessible for astronomical uses, it will be related to the HIPPARCOS stellar frame.

scholarly journals Radiointerferometric polar motion determination using a very long north-south baseline

1988 ◽  
Vol 128 ◽  
pp. 193-198 ◽  
Author(s):  
A Nothnagel ◽  
G. D. Nicolson ◽  
H Schuh ◽  
J Campbell ◽  
H Cloppenburg ◽  
...  
Keyword(s):  
Polar Motion ◽  
Daily Basis ◽  
Geodetic Survey ◽  
High Accuracy ◽  
National Geodetic Survey ◽  
Astronomy Observatory ◽  
Tectonic Plate ◽  
The Us ◽  
Single Baseline ◽  
Pole Component

The first high accuracy VLBI measurements with the Hartebeesthoek Radio Astronomy Observatory (HartRAO) at the southern end of the African tectonic plate were made possible at the beginning of 1986 through the loan of a MARK III DAT to HartRAO by the US National Geodetic Survey. Six twenty-four hour experiments spread over thirty-three days were used to precisely determine the HartRAO station position and to measure baseline lengths to Europe and North America. Interleaved between these multi-station experiments, a single baseline from Wettzell to HartRAO was used for two hours on a daily basis in order to measure pole positions. The formal errors of the x and y pole component determinations for each day are about ±2 mas and ±1 mas respectively, but an offset of about 6 mas from the IRIS values remains to be investigated.

scholarly journals Earth Rotation Information Derived from Merit and Polaris VLBI Observations

1981 ◽  
Vol 63 ◽  
pp. 97-122 ◽  
Author(s):  
D. S. Robertson ◽  
W. E. Carter
Keyword(s):  
Earth Rotation ◽  
The United States ◽  
Geodetic Survey ◽  
West Germany ◽  
National Geodetic Survey ◽  
Space Observatory ◽  
Paper Briefly ◽  
Owens Valley ◽  
Radio Observatory ◽  
Onsala Space Observatory

AbstractIn September and October 1980, the National Geodetic Survey, jointly with the National Aeronautics and Space Administration and several other agencies and institutions, conducted a series of astronomical radio interferometry (VLBI) observing sessions to support the IAU/IUGG MERIT short campaign. A total of 14 days of observations, organized into two 7-day sessions, was collected by three observatories in the United States (Harvard Radio Astronomy Station (HRAS), Haystack Observatory, and Owens Valley Radio Observatory) and the Onsala Space Observatory in Sweden. Chilbolton Observatory, England, and Effelsberg Observatory, West Germany, also participated on some days. Immediately following the MERIT campaign, NGS initiated a series of 24-hour observing sessions, spaced at approximately 2-week intervals, as a pilot program to project POLARIS. All of these sessions included two observatories, HRAS and Haystack, and Onsala participated in about half of the sessions. The MERIT and POLARIS observations were made with the third generation MARK III VLBI system using procedures and schedules designed to yield high quality geodetic information, including Earth rotation values. This paper briefly traces the planning, observing, and data processing activities, and presents the Earth rotation information thus far derived from the data.

scholarly journals An Introduction to Radio Interferometric Techniques

1979 ◽  
Vol 82 ◽  
pp. 177-181
Author(s):  
B. Elsmore
Keyword(s):  
Earth Rotation ◽  
Polar Motion ◽  
Radio Interferometry ◽  
Short Introduction ◽  
New Techniques

At this symposium we are to hear a great deal about new techniques for the measurement of earth rotation and polar motion that have come into being in the last decade and I am privileged to give a short introduction to one of these new techniques, that of radio interferometry.

INES MOVIES : A NEW ACOUSTIC DATA ACQUISITION AND PROCESSING SYSTEM

1990 ◽  
Vol 51 (C2) ◽  
pp. C2-939-C2-942 ◽  
Author(s):  
N. DINER ◽  
A. WEILL ◽  
J. Y. COAIL ◽  
J. M. COUDEVILLE
Keyword(s):  
Data Acquisition ◽  
Processing System ◽  
Acoustic Data ◽  
Data Acquisition And Processing

SN-2: a data acquisition and processing system

1989 ◽  
Vol 24 (9) ◽  
pp. 66-71
Author(s):  
Z. Defu ◽  
Y. Peigen ◽  
S. Zhongxiu
Keyword(s):  
Data Acquisition ◽  
Processing System ◽  
Data Acquisition And Processing

Multi-GNSS Single-Difference Baseline Processing at NGS with newly developed M-PAGES software

2021 ◽  
Author(s):  
Bryan Stressler ◽  
Andria Bilich ◽  
Clement Ogaja ◽  
Jacob Heck
Keyword(s):  
Geodetic Survey ◽  
Integer Ambiguity ◽  
National Geodetic Survey ◽  
Processing Strategy ◽  
Dual Frequency ◽  
Software Suite ◽  
Legacy Software ◽  
Double Differences ◽  
Single Difference ◽  
Gps Observations

<p>The U.S. National Geodetic Survey (NGS) has historically processed dual-frequency GPS observations in a double-differenced mode using the legacy software called the Program for the Adjustment of GPS Ephemerides (PAGES). As part of NGS’ modernization efforts, a new software suite named M-PAGES (i.e., Multi-GNSS PAGES) is being developed to replace PAGES. M-PAGES consists of a suite of C++ and Python libraries, programs, and scripts built to process observations from all GNSS constellations. The M-PAGES team has developed a single-difference baseline processing strategy that is suitable for multi-GNSS. This approach avoids the difficulty of forming double-differences across systems or frequencies, which may inhibit integer ambiguity resolution. The M-PAGES suite is expected to deploy to NGS’ Online Positioning User Service (OPUS) later this year. Here, we present the processing strategy being implemented along with a performance evaluation from sample baseline solutions obtained from data collected within the NOAA CORS Network.</p>

Sign in / Sign up

Export Citation Format

Share Document