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Proceedings of the Second Earth Orientation Parameters Prediction Comparison Campaign (2nd EOP PCC) Workshop, online, February 15-16, 2022

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Proceedings of the Conference on "Satelitarne metody wyznaczania pozycji we wspólczesnej geodezji i nawigacji" held in Wroclaw, Poland, June 2-4, 2011 - Part II

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Proceedings of the IERS Workshop on EOP Combination and Prediction, Warsaw, 19-21 October 2009

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Journal Details
Format
Journal
eISSN
2083-6104
First Published
03 May 2007
Publication timeframe
4 times per year
Languages
English

Search

Volume 52 (2017): Issue 4 (December 2017)

Journal Details
Format
Journal
eISSN
2083-6104
First Published
03 May 2007
Publication timeframe
4 times per year
Languages
English

Search

3 Articles
Open Access

Lifetime Performances of Modernized GLONASS Satellites: A Review

Shreya Sarkar and
Shreya Sarkar and
Anindya Bose
Anindya Bose
Published Online: 27 Dec 2017
Page range: 85 - 97

Abstract

Abstract

GLONASS, successfully operating during 1990s became unusable by early 2000s. Following a revitalization and modernization plan since 2004, GLONASS constellation has been completed again by the end of 2011 and the use of GLONASS is gaining popularity. Because of the previous experience, some scepticism exists among the stakeholders in using GLONASS for reliable solution and application development. This paper critically reviews the operational lifespan of GLONASS satellites launched between 2004 and 2016, as this is an important contributor towards reliability and sustained operation of the system. For popularization and extracting full benefits of GLONASS as stand-alone system or as an active component of multi-GNSS, major issues of assuring the minimum sufficient GLONASS constellation (of 24…23 satellites), efficient design implementation and the modernized ground control segment development and operation need to be properly taken care of by the system operators.

Keywords

  • GNSS
  • Multi-GNSS
  • GPS
  • GLONASS Modernisation
Open Access

Precise Receiver Clock Offset Estimations According to Each Global Navigation Satellite Systems (GNSS) Timescales

Thayathip Thongtan,
Thayathip Thongtan,
Pawit Tirawanichakul and
Pawit Tirawanichakul and
Chalermchon Satirapod
Chalermchon Satirapod
Published Online: 27 Dec 2017
Page range: 99 - 108

Abstract

Abstract

Each GNSS constellation operates its own system times; namely, GPS system time (GPST), GLONASS system time (GLONASST), BeiDou system time (BDT) and Galileo system time (GST). They could be traced back to Coordinated Universal Time (UTC) scale and are aligned to GPST. This paper estimates the receiver clock offsets to three timescales: GPST, GLONASST and BDT. The two measurement scenarios use two identical multi-GNSS geodetic receivers connected to the same geodetic antenna through a splitter. One receiver is driven by its internal oscillators and another receiver is connected to the external frequency oscillators, caesium frequency standard, kept as the Thailand standard time scale at the National Institute of Metrology (Thailand) called UTC(NIMT). The three weeks data are observed at 30 seconds sample rate. The receiver clock offsets with respected to the three system time are estimated and analysed through the geodetic technique of static Precise Point Positioning (PPP) using a data processing software developed by Wuhan University - Positioning And Navigation Data Analyst (PANDA) software. The estimated receiver clock offsets are around 32, 33 and 18 nanoseconds from GPST, GLONASST and BDT respectively. This experiment is initially stated that each timescale is inter-operated with GPST and further measurements on receiver internal delay has to be determined for clock comparisons especially the high accuracy clock at timing laboratories.

Keywords

  • System time
  • receiver clock offset determination
  • time comparisons
  • precise point positioning technique
Open Access

EGNOS Monitoring Prepared in Space Research Centre P.A.S. for SPMS Project

Anna Swiatek,
Anna Swiatek,
Leszek Jaworski and
Leszek Jaworski and
Lukasz Tomasik
Lukasz Tomasik
Published Online: 27 Dec 2017
Page range: 109 - 120

Abstract

Abstract

The European Geostationary Overlay Service (EGNOS) augments Global Positioning System (GPS) by providing correction data and integrity information for improving positioning over Europe. EGNOS Service Performance Monitoring Support (SPMS) project has assumed establishment, maintenance and implementation of an EGNOS performance monitoring network.

The paper presents preliminary results of analyses prepared in Space Research Centre, Polish Academy of Sciences (Warsaw), as one of partners in SPMS project.

Keywords

  • EGNOS
  • point positioning
  • augmentation monitoring
3 Articles
Open Access

Lifetime Performances of Modernized GLONASS Satellites: A Review

Shreya Sarkar and
Shreya Sarkar and
Anindya Bose
Anindya Bose
Published Online: 27 Dec 2017
Page range: 85 - 97

Abstract

Abstract

GLONASS, successfully operating during 1990s became unusable by early 2000s. Following a revitalization and modernization plan since 2004, GLONASS constellation has been completed again by the end of 2011 and the use of GLONASS is gaining popularity. Because of the previous experience, some scepticism exists among the stakeholders in using GLONASS for reliable solution and application development. This paper critically reviews the operational lifespan of GLONASS satellites launched between 2004 and 2016, as this is an important contributor towards reliability and sustained operation of the system. For popularization and extracting full benefits of GLONASS as stand-alone system or as an active component of multi-GNSS, major issues of assuring the minimum sufficient GLONASS constellation (of 24…23 satellites), efficient design implementation and the modernized ground control segment development and operation need to be properly taken care of by the system operators.

Keywords

  • GNSS
  • Multi-GNSS
  • GPS
  • GLONASS Modernisation
Open Access

Precise Receiver Clock Offset Estimations According to Each Global Navigation Satellite Systems (GNSS) Timescales

Thayathip Thongtan,
Thayathip Thongtan,
Pawit Tirawanichakul and
Pawit Tirawanichakul and
Chalermchon Satirapod
Chalermchon Satirapod
Published Online: 27 Dec 2017
Page range: 99 - 108

Abstract

Abstract

Each GNSS constellation operates its own system times; namely, GPS system time (GPST), GLONASS system time (GLONASST), BeiDou system time (BDT) and Galileo system time (GST). They could be traced back to Coordinated Universal Time (UTC) scale and are aligned to GPST. This paper estimates the receiver clock offsets to three timescales: GPST, GLONASST and BDT. The two measurement scenarios use two identical multi-GNSS geodetic receivers connected to the same geodetic antenna through a splitter. One receiver is driven by its internal oscillators and another receiver is connected to the external frequency oscillators, caesium frequency standard, kept as the Thailand standard time scale at the National Institute of Metrology (Thailand) called UTC(NIMT). The three weeks data are observed at 30 seconds sample rate. The receiver clock offsets with respected to the three system time are estimated and analysed through the geodetic technique of static Precise Point Positioning (PPP) using a data processing software developed by Wuhan University - Positioning And Navigation Data Analyst (PANDA) software. The estimated receiver clock offsets are around 32, 33 and 18 nanoseconds from GPST, GLONASST and BDT respectively. This experiment is initially stated that each timescale is inter-operated with GPST and further measurements on receiver internal delay has to be determined for clock comparisons especially the high accuracy clock at timing laboratories.

Keywords

  • System time
  • receiver clock offset determination
  • time comparisons
  • precise point positioning technique
Open Access

EGNOS Monitoring Prepared in Space Research Centre P.A.S. for SPMS Project

Anna Swiatek,
Anna Swiatek,
Leszek Jaworski and
Leszek Jaworski and
Lukasz Tomasik
Lukasz Tomasik
Published Online: 27 Dec 2017
Page range: 109 - 120

Abstract

Abstract

The European Geostationary Overlay Service (EGNOS) augments Global Positioning System (GPS) by providing correction data and integrity information for improving positioning over Europe. EGNOS Service Performance Monitoring Support (SPMS) project has assumed establishment, maintenance and implementation of an EGNOS performance monitoring network.

The paper presents preliminary results of analyses prepared in Space Research Centre, Polish Academy of Sciences (Warsaw), as one of partners in SPMS project.

Keywords

  • EGNOS
  • point positioning
  • augmentation monitoring