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Volumen 46 (2011): Heft 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): Heft 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

Volumen 46 (2011): Heft 2 (June 2011)

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

Volumen 45 (2010): Heft 1 (March 2010)

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Zeitschriftendaten
Format
Zeitschrift
eISSN
2083-6104
Erstveröffentlichung
03 May 2007
Erscheinungsweise
4 Hefte pro Jahr
Sprachen
Englisch

Suche

Volumen 53 (2018): Heft 1 (March 2018)

Zeitschriftendaten
Format
Zeitschrift
eISSN
2083-6104
Erstveröffentlichung
03 May 2007
Erscheinungsweise
4 Hefte pro Jahr
Sprachen
Englisch

Suche

4 Artikel
Uneingeschränkter Zugang

Self-Shadowing of a Spacecraft in the Computation of Surface Forces. An Example in Planetary Geodesy

Online veröffentlicht: 24 Mar 2018
Seitenbereich: 1 - 27

Zusammenfassung

Abstract

We describe in details the algorithms used in modelling the self-shadowing between spacecraft components, which appears when computing the surface forces as precisely as possible and especially when moving parts are involved. This becomes necessary in planetary geodesy inverse problems using more and more precise orbital information to derive fundamental parameters of geophysical interest. Examples are given with two Mars orbiters, which show significant improvement on drag and solar radiation pressure model multiplying factors, a prerequisite for improving in turn the determination of other global models.

Schlüsselwörter

  • Surface forces
  • Self-shadowing
  • Polyhedral decomposition
  • Pixelation
  • Mars Planet
Uneingeschränkter Zugang

Structural Analysis of Kufasat Using Ansys Program

Online veröffentlicht: 24 Mar 2018
Seitenbereich: 29 - 35

Zusammenfassung

Abstract

The current work focuses on vibration and modal analysis of KufaSat structure using ANSYS 16 program. Three types of Aluminum alloys (5052-H32, 6061-T6 and 7075-T6) were selected for investigation of the structure under design loads. Finite element analysis (FEA) in design static load of 51 g was performed. The natural frequencies for five modes were estimated using modal analysis. In order to ensure that KufaSat could withstand with various conditions during launch, the Margin of safety was calculated. The results of deformation and Von Mises stress for linear buckling analysis were also performed. The comparison of data was done to select the optimum material for KufaSat structures.

Schlüsselwörter

  • CubeSat
  • modal analysis
  • structure analysis
  • natural frequency
  • FEA
Uneingeschränkter Zugang

Kinematic-PPP using Single/Dual Frequency Observations from (GPS, GLONASS and GPS/GLONASS) Constellations for Hydrography

Online veröffentlicht: 24 Mar 2018
Seitenbereich: 37 - 46

Zusammenfassung

Abstract

Global Positioning System (GPS) technology is ideally suited for inshore and offshore positioning because of its high accuracy and the short observation time required for a position fix. Precise point positioning (PPP) is a technique used for position computation with a high accuracy using a single GNSS receiver. It relies on highly accurate satellite position and clock data that can be acquired from different sources such as the International GNSS Service (IGS). PPP precision varies based on positioning technique (static or kinematic), observations type (single or dual frequency) and the duration of observations among other factors. PPP offers comparable accuracy to differential GPS with safe in cost and time. For many years, PPP users depended on GPS (American system) which considered the solely reliable system. GLONASS's contribution in PPP techniques was limited due to fail in maintaining full constellation. Yet, GLONASS limited observations could be integrated into GPS-based PPP to improve availability and precision. As GLONASS reached its full constellation early 2013, there is a wide interest in PPP systems based on GLONASS only and independent of GPS. This paper investigates the performance of kinematic PPP solution for the hydrographic applications in the Nile river (Aswan, Egypt) based on GPS, GLONASS and GPS/GLONASS constellations. The study investigates also the effect of using two different observation types; single-frequency and dual frequency observations from the tested constellations.

Schlüsselwörter

  • GPS/GLONASS
  • Precise Point Positioning
  • Kinematic
  • Single/dual
  • Hydrography
Uneingeschränkter Zugang

A New Method for Measuring Angular Increments Based on a Tri-Axial Accelerometer and a Tri-Axial Magnetometer

Online veröffentlicht: 24 Mar 2018
Seitenbereich: 47 - 53

Zusammenfassung

Abstract

Tri-axial gyroscopes used to be the only instrument used to measure the angular increments of airplanes. However, because there were no reference devices, drift and accumulation errors affected the accuracy of the estimated attitude. In this paper, we propose a novel method for measuring angular increments based on a tri-axial accelerometer and a triaxial magnetometer. Then, we mathematically proved the feasibility of the proposed method. The results of our simulation and experimental tests indicated that the proposed method accurately indicates the attitude of an airplane.

4 Artikel
Uneingeschränkter Zugang

Self-Shadowing of a Spacecraft in the Computation of Surface Forces. An Example in Planetary Geodesy

Online veröffentlicht: 24 Mar 2018
Seitenbereich: 1 - 27

Zusammenfassung

Abstract

We describe in details the algorithms used in modelling the self-shadowing between spacecraft components, which appears when computing the surface forces as precisely as possible and especially when moving parts are involved. This becomes necessary in planetary geodesy inverse problems using more and more precise orbital information to derive fundamental parameters of geophysical interest. Examples are given with two Mars orbiters, which show significant improvement on drag and solar radiation pressure model multiplying factors, a prerequisite for improving in turn the determination of other global models.

Schlüsselwörter

  • Surface forces
  • Self-shadowing
  • Polyhedral decomposition
  • Pixelation
  • Mars Planet
Uneingeschränkter Zugang

Structural Analysis of Kufasat Using Ansys Program

Online veröffentlicht: 24 Mar 2018
Seitenbereich: 29 - 35

Zusammenfassung

Abstract

The current work focuses on vibration and modal analysis of KufaSat structure using ANSYS 16 program. Three types of Aluminum alloys (5052-H32, 6061-T6 and 7075-T6) were selected for investigation of the structure under design loads. Finite element analysis (FEA) in design static load of 51 g was performed. The natural frequencies for five modes were estimated using modal analysis. In order to ensure that KufaSat could withstand with various conditions during launch, the Margin of safety was calculated. The results of deformation and Von Mises stress for linear buckling analysis were also performed. The comparison of data was done to select the optimum material for KufaSat structures.

Schlüsselwörter

  • CubeSat
  • modal analysis
  • structure analysis
  • natural frequency
  • FEA
Uneingeschränkter Zugang

Kinematic-PPP using Single/Dual Frequency Observations from (GPS, GLONASS and GPS/GLONASS) Constellations for Hydrography

Online veröffentlicht: 24 Mar 2018
Seitenbereich: 37 - 46

Zusammenfassung

Abstract

Global Positioning System (GPS) technology is ideally suited for inshore and offshore positioning because of its high accuracy and the short observation time required for a position fix. Precise point positioning (PPP) is a technique used for position computation with a high accuracy using a single GNSS receiver. It relies on highly accurate satellite position and clock data that can be acquired from different sources such as the International GNSS Service (IGS). PPP precision varies based on positioning technique (static or kinematic), observations type (single or dual frequency) and the duration of observations among other factors. PPP offers comparable accuracy to differential GPS with safe in cost and time. For many years, PPP users depended on GPS (American system) which considered the solely reliable system. GLONASS's contribution in PPP techniques was limited due to fail in maintaining full constellation. Yet, GLONASS limited observations could be integrated into GPS-based PPP to improve availability and precision. As GLONASS reached its full constellation early 2013, there is a wide interest in PPP systems based on GLONASS only and independent of GPS. This paper investigates the performance of kinematic PPP solution for the hydrographic applications in the Nile river (Aswan, Egypt) based on GPS, GLONASS and GPS/GLONASS constellations. The study investigates also the effect of using two different observation types; single-frequency and dual frequency observations from the tested constellations.

Schlüsselwörter

  • GPS/GLONASS
  • Precise Point Positioning
  • Kinematic
  • Single/dual
  • Hydrography
Uneingeschränkter Zugang

A New Method for Measuring Angular Increments Based on a Tri-Axial Accelerometer and a Tri-Axial Magnetometer

Online veröffentlicht: 24 Mar 2018
Seitenbereich: 47 - 53

Zusammenfassung

Abstract

Tri-axial gyroscopes used to be the only instrument used to measure the angular increments of airplanes. However, because there were no reference devices, drift and accumulation errors affected the accuracy of the estimated attitude. In this paper, we propose a novel method for measuring angular increments based on a tri-axial accelerometer and a triaxial magnetometer. Then, we mathematically proved the feasibility of the proposed method. The results of our simulation and experimental tests indicated that the proposed method accurately indicates the attitude of an airplane.

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