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Volume 57 (2022): Edizione 3 (September 2022)

Volume 57 (2022): Edizione 2 (June 2022)

Volume 57 (2022): Edizione 1 (March 2022)

Volume 56 (2021): Edizione 4 (December 2021)

Volume 56 (2021): Edizione 3 (September 2021)

Volume 56 (2021): Edizione 2 (June 2021)

Volume 56 (2021): Edizione 1 (March 2021)

Volume 55 (2020): Edizione 4 (December 2020)

Volume 55 (2020): Edizione 3 (September 2020)

Volume 55 (2020): Edizione 2 (June 2020)

Volume 55 (2020): Edizione 1 (March 2020)

Volume 54 (2019): Edizione 4 (December 2019)

Volume 54 (2019): Edizione 3 (September 2019)

Volume 54 (2019): Edizione 2 (June 2019)

Volume 54 (2019): Edizione 1 (March 2019)

Volume 53 (2018): Edizione 4 (December 2018)

Volume 53 (2018): Edizione 3 (September 2018)

Volume 53 (2018): Edizione 2 (June 2018)

Volume 53 (2018): Edizione 1 (March 2018)

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

Volume 52 (2017): Edizione 3 (September 2017)

Volume 52 (2017): Edizione 2 (June 2017)

Volume 52 (2017): Edizione 1 (March 2017)

Volume 51 (2016): Edizione 4 (December 2016)

Volume 51 (2016): Edizione 3 (September 2016)

Volume 51 (2016): Edizione 2 (June 2016)

Volume 51 (2016): Edizione 1 (March 2016)

Volume 50 (2015): Edizione 4 (December 2015)

Volume 50 (2015): Edizione 3 (September 2015)

Volume 50 (2015): Edizione 2 (June 2015)

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Volume 49 (2014): Edizione 4 (December 2014)

Volume 49 (2014): Edizione 3 (September 2014)

Volume 49 (2014): Edizione 2 (June 2014)

Volume 49 (2014): Edizione 1 (March 2014)

Volume 48 (2013): Edizione 4 (December 2013)

Volume 48 (2013): Edizione 3 (September 2013)

Volume 48 (2013): Edizione 2 (June 2013)

Volume 48 (2013): Edizione 1 (March 2013)

Volume 47 (2012): Edizione 4 (December 2012)

Volume 47 (2012): Edizione 3 (September 2012)

Volume 47 (2012): Edizione 2 (June 2012)

Volume 47 (2012): Edizione 1 (March 2012)

Volume 46 (2011): Edizione 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

Volume 46 (2011): Edizione 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

Volume 46 (2011): Edizione 2 (June 2011)

Volume 46 (2011): Edizione 1 (March 2011)

Volume 45 (2010): Edizione 4 (December 2010)

Volume 45 (2010): Edizione 3 (September 2010)

Volume 45 (2010): Edizione 2 (June 2010)
Proceedings of the IERS Workshop on EOP Combination and Prediction, Warsaw, 19-21 October 2009

Volume 45 (2010): Edizione 1 (March 2010)

Volume 44 (2009): Edizione 4 (December 2009)

Volume 44 (2009): Edizione 3 (September 2009)

Volume 44 (2009): Edizione 2 (June 2009)

Volume 44 (2009): Edizione 1 (March 2009)

Volume 43 (2008): Edizione 4 (December 2008)

Volume 43 (2008): Edizione 3 (September 2008)

Volume 43 (2008): Edizione 2 (June 2008)

Volume 43 (2008): Edizione 1 (March 2008)

Volume 42 (2007): Edizione 4 (December 2007)

Volume 42 (2007): Edizione 3 (September 2007)

Volume 42 (2007): Edizione 2 (June 2007)

Volume 42 (2007): Edizione 1 (March 2007)

Volume 41 (2006): Edizione 4 (December 2006)

Volume 41 (2006): Edizione 3 (September 2006)

Volume 41 (2006): Edizione 2 (June 2006)

Volume 41 (2006): Edizione 1 (March 2006)

Dettagli della rivista
Formato
Rivista
eISSN
2083-6104
Pubblicato per la prima volta
03 May 2007
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

Volume 52 (2017): Edizione 2 (June 2017)

Dettagli della rivista
Formato
Rivista
eISSN
2083-6104
Pubblicato per la prima volta
03 May 2007
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

2 Articoli
Accesso libero

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

Pubblicato online: 26 Jun 2017
Pagine: 19 - 26

Astratto

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.

Parole chiave

  • Static
  • PPP
  • GPS
  • Single frequency
  • Observations duration
Accesso libero

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

Pubblicato online: 26 Jun 2017
Pagine: 27 - 40

Astratto

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).

Parole chiave

  • near-field interference effects
  • GPS
  • GLONASS
  • PPP
2 Articoli
Accesso libero

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

Pubblicato online: 26 Jun 2017
Pagine: 19 - 26

Astratto

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.

Parole chiave

  • Static
  • PPP
  • GPS
  • Single frequency
  • Observations duration
Accesso libero

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

Pubblicato online: 26 Jun 2017
Pagine: 27 - 40

Astratto

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).

Parole chiave

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

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