scholarly journals Current Status and Future Directions of the IERS RS/PC Predictions of UT1

2009 ◽  
Vol 5 (H15) ◽  
pp. 218-218 ◽  
Author(s):  
W. Wooden ◽  
B. Luzum ◽  
N. Stamatakos
Keyword(s):  
Global Positioning System ◽  
Very Long Baseline Interferometry ◽  
Current Status ◽  
Laser Ranging ◽  
Positioning System ◽  
Reference Systems ◽  
Future Directions ◽  
Long Baseline ◽  
Global Positioning ◽  
E Mail

The International Earth Rotation and Reference Systems Service (IERS) Rapid Service/Prediction Center (RS/PC) produces daily and weekly EOP combination and prediction solutions. The daily solutions are produced after 1700 UTC while the weekly EOP solutions are produced Thursday after 1700 UTC. These solutions include data from Atmospheric Angular Momentum (AAM) analysis and forecasts, Global Positioning System (GPS) solutions, Satellite Laser Ranging (SLR) solutions, and Very Long Baseline Interferometry (VLBI) solutions. The solutions are sent to roughly 700 people by e-mail per week and are picked up in roughly 40000 ftp downloads per month.

scholarly journals Introduction of JD 19: Nutation

1995 ◽  
Vol 10 ◽  
pp. 209-213
Author(s):  
V. Dehant
Keyword(s):  
Global Positioning System ◽  
Laser Ranging ◽  
Lunar Laser Ranging ◽  
Long Baseline ◽  
Lunar Laser ◽  
Global Positioning ◽  
Nutation Series ◽  
Precise Time ◽  
Better Than ◽  
Precession Constant

Due to both precise time measurements and precise geodetic positioning methods (like Very Long Baseline Interferometry (VLBI), Lunar Laser Ranging (LLR), Satellite Laser Ranging (SLR) and Global Positioning System (GPS)), the position of the instantaneous axis of the Earth’s rotation in space is measured with a precision better than a tenth of milliarcsecond. Simultaneously the amplitudes of the nutations of the Celestial Ephemeris Pole (CEP) deduced from the observations, i.e. the periodic motions in space of the CEP due to the luni-solar attraction or to other planetary attractions, have also been improved. However, these observed nutation amplitudes differ with respect to the computated ones based on an elliptical, uniformly rotating and deformable Earth responding to the lunar and solar attractions, as adopted by the IAU in 1980. The first session on “Observations and data reduction” dealt with Earth’s orientation observations and data analysis for deriving precession and nutations, as well as the associated residuals with respect to the adopted precession constant and nutation series. Comparisons between the different results have been presented including in-phase and out-of-phase components of the prograde and retrograde nutations or of nutations in longitude and in obliquity (see Session 1 of our JD: Newhall et al., McCarthy and Luzum, Herring, and Session 2: Gross). These differences “observed - adopted” nutations achieve several milliarcseconds and exhibit periodic as well as secular characteristics.

scholarly journals Los medios de prueba tecnológicos en el proceso laboral peruano

2021 ◽  
Vol 3 (3) ◽  
pp. 145-166
Author(s):  
Roy Alexis Quispe Agipe
Keyword(s):  
Global Positioning System ◽  
Positioning System ◽  
Redes Sociales ◽  
Global Positioning ◽  
E Mail

En el presente informe se analiza la naturaleza y caracteres de la prueba tecnológica, así como su regulación en el proceso laboral peruano. A la vez, se estudian las diferentes fuentes digitales de las que se puede extraer esta prueba, tales como el e-mail, el Global Positioning System (GPS), la videovigilancia laboral, las redes sociales, entre otros sistemas tecnológicos que se utilizan con ocasión de los contratos de trabajo. Asimismo, será objeto de análisis la admisión de dichos medios probatorios, y si es posible que se pueda ejercer el derecho de contradicción a través del planteamiento de cuestiones probatorias. Como colofón, se analiza si existe una coalición entre el ejercicio del derecho a probar a través de la prueba tecnológica y otros derechos fundamentales del trabajador o empleador.

The contribution of gps to the information society

CISM journal ◽  
1990 ◽  
Vol 44 (3) ◽  
pp. 225-231
Author(s):  
M. Elizabeth Cannon
Keyword(s):  
Global Positioning System ◽  
Information Society ◽  
Control Point ◽  
Data Gathering ◽  
Cost Effective ◽  
Current Status ◽  
Positioning System ◽  
Global Positioning ◽  
Hydrographic Surveying

The Global Positioning System (GPS) is rapidly becoming an important tool in the surveying community. It is currently being used in a number of applications, ranging from cadastral control point establishment to hydrographic surveying. The emphasis of this paper is on the contribution of GPS to the information society. Fundamental aspects of GPS are presented and the current status of the system is outlined. The advantages of using GPS in the collection of georeferenced data and specifically its impact on Geographic Information Systems are described. Issues such as the establishment of an Active Control System, the development of new surveying techniques and the integration of GPS with other sensors for cost-effective data gathering are addressed. The future role of GPS in the collection of georeferenced information and a discussion of new and exciting opportunities for surveyors being created by GPS, concludes the paper.

scholarly journals Hubungan Penggunaan Smartphone pada Malam Hari Terhadap Kualitas Tidur Mahasiswa Program Studi Pendidikan Dokter Fakultas Kedokteran Universitas Andalas

2021 ◽  
Vol 1 (3) ◽  
pp. 379-385
Author(s):  
Nika Fitri Lubis ◽  
Fathiya Juwita Hanum ◽  
Mohamad Reza
Keyword(s):  
Global Positioning System ◽  
Light Emitting Diode ◽  
Personal Digital Assistant ◽  
P Value ◽  
Positioning System ◽  
Cross Sectional ◽  
Light Emitting ◽  
Global Positioning ◽  
E Mail ◽  
Wireless Mobile

Smartphone adalah telepon yang menggabungkan kemampuan-kemampuan canggih dan merupakan bentuk lanjutan dari Wireless Mobile Device (WMD) yang bisa berfungsi seperti komputer dengan menawarkan fitur-fitur yaitu Personal Digital Assistant (PDA), akses internet, e-mail, dan Global Positioning System (GPS). Indonesia merupakan pengguna aktif smartphone terbesar keempat di dunia setelah Cina, India, dan Amerika. Smartphone dilengkapi dengan tampilan light-emitting diode (LED) yang dapat menyebabkan penekanan produksi melatonin pada malam hari dan mempengaruhi regulasi sirkadian dari siklus tidur-bangun, sehingga mempengaruhi kualitas tidur. Tujuan: Mengetahui hubungan penggunaan smartphone pada malam hari terhadap kualitas tidur mahasiswa program studi Pendidikan Dokter Fakultas Kedokteran Universitas Andalas. Metode: Penelitian menggunakan metode analitik dengan desain cross-sectional yang dilakukan di Fakultas Kedokteran Universitas Andalas pada bulan Oktober 2019 – Juni 2020 . Teknik pengambilan sampel adalah stratified random sampling dengan jumlah total 261 sampel. Hasil: Penggunaan smartphone pada malam hari <2 jam (11,1 %), >2 jam (88,9%), kualitas tidur baik (37,9%), kualitas tidur buruk (62,1%). Hasil analisis bivariat didapatkan nilai p-value 0,024 (<0,05) yang berarti terdapat hubungan yang bermakna antara penggunaan smartphone pada malam hari terhadap kualitas tidur mahasiswa Pendidikan Dokter Fakultas Kedokteran Universitas Andalas. Simpulan: Terdapat hubungan yang bermakna antara penggunaan smartphone pada malam hari terhadap kualitas tidur mahasiswa program studi Pendidikan Dokter Fakultas Kedokteran Universitas Andalas. Kata Kunci: Smartphone, kualitas tidur.      

A case study of the application of GPS to lunar laser ranging timing systems

2018 ◽  
Vol 12 (4) ◽  
pp. 279-287
Author(s):  
C. Munghemezulu ◽  
L. Combrinck ◽  
O. J. Botai
Keyword(s):  
Global Positioning System ◽  
Frequency Standard ◽  
Laser Ranging ◽  
Positioning System ◽  
Lunar Laser Ranging ◽  
Frequency Standards ◽  
Lunar Laser ◽  
Timing System ◽  
Global Positioning ◽  
Rubidium Clock

Abstract The Hartebeesthoek Radio Astronomy Observatory is currently building a Lunar Laser Ranging station. This geodetic technique requires a good timing system to measure a round trip of laser photons from the telescope to the Moon and back to the telescope. We test the newly acquired timing system using examples of the Global Positioning System applications. Data in Receiver Independent Exchange Format was processed using GAMIT/GLOBK software. The results were compared against those derived from the Global Positioning System receivers that were integrated with a frequency standard from a hydrogen maser and a standard internal quartz. The results indicate that (i) the rubidium clock operates optimally and the clock drifted to within error margins of sub-centimetre level during the period of 2.5 seconds, (ii) the selected site for the permanent installation of the timing antenna has minimal multipath effect and (iii) we observed no improvement in Global Positioning System products derived from receivers that were integrated with different frequency standards.

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