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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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Volumen 52 (2017): Edición 4 (December 2017)

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Volumen 52 (2017): Edición 2 (June 2017)

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Volumen 46 (2011): Edición 4 (December 2011)
Proceedings of the Conference on "Satelitarne metody wyznaczania pozycji we wspólczesnej geodezji i nawigacji" held in Wroclaw, Poland, June 2-4, 2011 - Part II

Volumen 46 (2011): Edición 3 (September 2011)
Proceedings of the Conference on "Satelitarne metody wyznaczania pozycji we wspólczesnej geodezji i nawigacji" held in Wroclaw, Poland, June 2-4, 2011 - Part I

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

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Detalles de la revista
Formato
Revista
eISSN
2083-6104
Publicado por primera vez
03 May 2007
Periodo de publicación
4 veces al año
Idiomas
Inglés

Buscar

Volumen 52 (2017): Edición 2 (June 2017)

Detalles de la revista
Formato
Revista
eISSN
2083-6104
Publicado por primera vez
03 May 2007
Periodo de publicación
4 veces al año
Idiomas
Inglés

Buscar

2 Artículos
Acceso abierto

Variation of Static-PPP Positioning Accuracy Using GPS-Single Frequency Observations (Aswan, Egypt)

Ashraf Farah
Ashraf Farah
Publicado en línea: 26 Jun 2017
Páginas: 19 - 26

Resumen

Abstract

Precise Point Positioning (PPP) is a technique used for position computation with a high accuracy using only one GNSS receiver. It depends on highly accurate satellite position and clock data rather than broadcast ephemeries. PPP precision varies based on positioning technique (static or kinematic), observations type (single or dual frequency) and the duration of collected observations. PPP-(dual frequency receivers) offers comparable accuracy to differential GPS. PPP-single frequency receivers has many applications such as infrastructure, hydrography and precision agriculture. PPP using low cost GPS single-frequency receivers is an area of great interest for millions of users in developing countries such as Egypt. This research presents a study for the variability of single frequency static GPS-PPP precision based on different observation durations.

Palabras clave

  • Static
  • PPP
  • GPS
  • Single frequency
  • Observations duration
Acceso abierto

GNSS Antenna Caused Near-Field Interference Effect in Precise Point Positioning Results

Karol Dawidowicz y
Karol Dawidowicz y
Radosław Baryła
Radosław Baryła
Publicado en línea: 26 Jun 2017
Páginas: 27 - 40

Resumen

Abstract

Results of long-term static GNSS observation processing adjustment prove that the often assumed “averaging multipath effect due to extended observation periods” does not actually apply. It is instead visible a bias that falsifies the coordinate estimation. The comparisons between the height difference measured with a geometrical precise leveling and the height difference provided by GNSS clearly verify the impact of the near-field multipath effect.

The aim of this paper is analysis the near-field interference effect with respect to the coordinate domain. We demonstrate that the way of antennas mounting during observation campaign (distance from nearest antennas) can cause visible changes in pseudo-kinematic precise point positioning results. GNSS measured height differences comparison revealed that bias of up to 3 mm can be noticed in Up component when some object (additional GNSS antenna) was placed in radiating near-field region of measuring antenna. Additionally, for both processing scenario (GPS and GPS/GLONASS) the scattering of results clearly increased when additional antenna crosses radiating near-field region of measuring antenna. It is especially true for big choke ring antennas. In short session (15, 30 min.) the standard deviation was about twice bigger in comparison to scenario without additional antenna. When we used typical surveying antennas (short near-field region radius) the effect is almost invisible. In this case it can be observed the standard deviation increase of about 20%. On the other hand we found that surveying antennas are generally characterized by lower accuracy than choke ring antennas. The standard deviation obtained on point with this type of antenna was bigger in all processing scenarios (in comparison to standard deviation obtained on point with choke ring antenna).

Palabras clave

  • near-field interference effects
  • GPS
  • GLONASS
  • PPP
2 Artículos
Acceso abierto

Variation of Static-PPP Positioning Accuracy Using GPS-Single Frequency Observations (Aswan, Egypt)

Ashraf Farah
Ashraf Farah
Publicado en línea: 26 Jun 2017
Páginas: 19 - 26

Resumen

Abstract

Precise Point Positioning (PPP) is a technique used for position computation with a high accuracy using only one GNSS receiver. It depends on highly accurate satellite position and clock data rather than broadcast ephemeries. PPP precision varies based on positioning technique (static or kinematic), observations type (single or dual frequency) and the duration of collected observations. PPP-(dual frequency receivers) offers comparable accuracy to differential GPS. PPP-single frequency receivers has many applications such as infrastructure, hydrography and precision agriculture. PPP using low cost GPS single-frequency receivers is an area of great interest for millions of users in developing countries such as Egypt. This research presents a study for the variability of single frequency static GPS-PPP precision based on different observation durations.

Palabras clave

  • Static
  • PPP
  • GPS
  • Single frequency
  • Observations duration
Acceso abierto

GNSS Antenna Caused Near-Field Interference Effect in Precise Point Positioning Results

Karol Dawidowicz y
Karol Dawidowicz y
Radosław Baryła
Radosław Baryła
Publicado en línea: 26 Jun 2017
Páginas: 27 - 40

Resumen

Abstract

Results of long-term static GNSS observation processing adjustment prove that the often assumed “averaging multipath effect due to extended observation periods” does not actually apply. It is instead visible a bias that falsifies the coordinate estimation. The comparisons between the height difference measured with a geometrical precise leveling and the height difference provided by GNSS clearly verify the impact of the near-field multipath effect.

The aim of this paper is analysis the near-field interference effect with respect to the coordinate domain. We demonstrate that the way of antennas mounting during observation campaign (distance from nearest antennas) can cause visible changes in pseudo-kinematic precise point positioning results. GNSS measured height differences comparison revealed that bias of up to 3 mm can be noticed in Up component when some object (additional GNSS antenna) was placed in radiating near-field region of measuring antenna. Additionally, for both processing scenario (GPS and GPS/GLONASS) the scattering of results clearly increased when additional antenna crosses radiating near-field region of measuring antenna. It is especially true for big choke ring antennas. In short session (15, 30 min.) the standard deviation was about twice bigger in comparison to scenario without additional antenna. When we used typical surveying antennas (short near-field region radius) the effect is almost invisible. In this case it can be observed the standard deviation increase of about 20%. On the other hand we found that surveying antennas are generally characterized by lower accuracy than choke ring antennas. The standard deviation obtained on point with this type of antenna was bigger in all processing scenarios (in comparison to standard deviation obtained on point with choke ring antenna).

Palabras clave

  • near-field interference effects
  • GPS
  • GLONASS
  • PPP

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