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Thursday, May 7, 2020 | History

4 edition of Effects of the troposphere on GPS measurements found in the catalog.

Effects of the troposphere on GPS measurements

Ronald Edward Berg

Effects of the troposphere on GPS measurements

by Ronald Edward Berg

  • 252 Want to read
  • 28 Currently reading

Published by National Library of Canada in Ottawa .
Written in English


Edition Notes

SeriesCanadian theses = Thèses canadiennes
The Physical Object
FormatMicroform
Pagination2 microfiches.
ID Numbers
Open LibraryOL18682409M
ISBN 100315566523
OCLC/WorldCa25367552

EFFECT OF TROPOSPHERE INDUCED GPS NAVIGATION ERROR measurements are from a negative elevation GPS satellite, which is near/below the earth tangent horizon. The situation is similar to that used constructively in radio occultation GPS receivers where the measurements are processed to obtain tropospheric characteristics. In order to avoid this, the short time-scale variations of the wet component of the Earth troposphere should be calibrated by means of water vapour radiometers or GPS measurements. A future ESA ground station media calibration systems should be at least capable to calibrate both the zenith hydrostatic path delay (ZHD) and the zenith wet path.

The effect of the wet troposphere is sometime mitigated by specifying a minimum elevation angle. this eliminates the bending effect, but not the delay. "GPS Atmospheric Water Vapor Measurements Without the Use of Local Barometers." Quinn, K. J. "Meteorological Data Guide for Geodesists.". Satellite measurements of warming in the troposphere What The Science Says: The most recent satellite data show that the earth as a whole is warming. Climate Myth: Satellites show no warming in the troposphere "Satellite measurements indicate an absence of significant global warming since ,File Size: KB.

  The demand for geodetic time series that are accurate and stable is increasing. One factor limiting their accuracy is troposphere refraction, which is hard to model and compute with sufficient resolution, both in time and space. We have studied the effect of numerical weather model (NWM)-derived troposphere slant delays and the most commonly used mapping functions, Niell and Cited by: 3. L1 - Processing 0 5 10 15 20 25 Ionosphere Troposphere Local Effects Current New GNSS (13) New GNSS (24) o o.


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Effects of the troposphere on GPS measurements by Ronald Edward Berg Download PDF EPUB FB2

Effect of the troposphere on GPS measurements - NASA/ADS How the neutral part of the atmosphere affects the propagation of GPS signals is described. The nature of the tropospheric effect, its size and variability, and methods to reduce the effect on GPS position determinations Cited by: Cite this paper as: Kurzyńska K., Gabryszewska A.

() Influence of the Local Troposphere on GPS Measurements. In: Pretka-Ziomek H., Wnuk E., Seidelmann P.K Cited by: 1. The troposphere and the ionosphere are by no means alike in their effect on the satellite’s signal. While the troposphere is refractive, its refraction of a GPS satellite’s signal is not related to its frequency.

The refraction is tantamount to a delay in the arrival of a GPS satellite's signal. The tricky aspect is the delay’s wet part, caused by water vapor in the tropo-sphere’s lower lay- ers. Similar to the ionospheric electron con- tent, the water vapor’s spatial and temporal distribution is largely unpredictable and can undergo rapid variations, especially in the presence of a weather by: Tralli, D.M., T.M.

Dixon, S.A. Stephens () The Effect of Wet Tropospheric Path Delay on Estimation of Geodetic Baselines in the Gulf of California using the Global Positioning System. JPL Geodesy and Geophysics Preprint No. Cited by: The tropospheric effect is much more pronounced at the equatorial region due to its hot.

and wet conditions. This significantly affects the GPS signal due to the variability of the refractive. Effect on GPS Positioning Using Real GPS Data.

Tahir Saleem and Mohammad Usman Department of Electronic Engineering, International Islamic University Islamabad Pakistan. Email: {41, musman} @ Abstract—The GPS (Global Positioning System) is used for navigation and positioning purposes by a diverse set of users.

Tropospheric Effects on GNSS The Atmosphere and its Effect on GNSS Systems 14 to 16 April Santiago, Chile Background 1 of 2 • The troposphere contains about Minimum Operational Performance Standards for Global Positioning System/Wide Area Augmentation System, DOD, RTCA, Inc., Washington, D.C., File Size: KB.

effects of the ionosphere (99% of this error source), allowing for the removal of this error to. the centimetre-level even with low elevation observations and high atmospheric electron. content. the models regarding the ionosphere and troposphere; section 3 presents the geographic location method adopted using Doppler shift measurements; section 4 describes the development of the work; section 5 describes the results related to seasonal and day-night effects on the two platforms of the test, as well as DCP lo-cation errors.

Characterization of atmospheric structures observed by a VHF MST-type radar in the troposphere over Santa Cruz, Costa Rica. Earth, Planets and Space, Vol. Cited by: 7. Compared with AIRS measurements, the GPS RO measurements are less correlated because the GPS RO measurement corresponding to a given ray depends on the atmospheric state only above the tangent point of that ray (Ahmad and Tyler ).

However, since GPS RO refractivity is a function of both temperature and moisture [ by: Using this property, the GPS system is designed with several working frequencies, so that ionospheric effects can be measured or corrected.

One of the largest error sources in a single-frequency GPS solution is due to the ionosphere which both slows and refracts GPS signals as Cited by: 7. The main feature of the troposphere is that it is a non dispersive media with respect to electromagnetic waves up to 15GHz, i.e., the tropospheric effects are not frequency dependent for the GNSS signals.

Thence, the carrier phase and code measurements are affected by the same : Intermediate. Climate Myth: Satellites show no warming in the troposphere "Satellite measurements indicate an absence of significant global warming sincethe very period that human carbon dioxide emissions have been increasing rapidly.

The satellite data signal not only the absence of substantial human-induced warming but also. Robock, in Encyclopedia of Atmospheric Sciences (Second Edition), GPS soil moisture observations. GPS satellites transmit L-band signals that are used for navigation. By comparing the direct microwave signal received at a GPS receiver mounted on a pole in an open field with the signal reflected from the ground, the soil moisture in the top several tens of centimeters can be measured.

Global positioning system radio occultation (GPS/RO) measurements from the Challenging Minisatellite Payload (CHAMP) and Satelite de Aplicaciones Cientificas-C (SAC-C) satellites are used to improve tropospheric profile retrievals derived from the Aqua platform high-spectral-resolution Atmospheric Infrared Sounder (AIRS) and broadband Advanced Microwave Sounding Unit (AMSU) measurements Cited by: 3.

Global temperature Satellite measurements of the troposphere confirm warming trend, explains in a guest post for Climate Lab Book: “Because the effects of El Niño are stronger in the temperature of the lower troposphere than in the near-surface temperature, the yearfollowing the strongest El Niño on record, is indeed still the.

measurements from more than one frequency are available, for instance from dual-frequency GPS receivers, this can be used for enhanced modeling of the ionospheric effect by using combinations of the measurements made on both fre-quencies.

The basic expression for estimation of the ionospheric delay for dual frequency code-based positioning is shownFile Size: 4MB.

One of the methods to reflect the atmosphere conditions within the local GPS network is a local troposphere model LT. Input data for this model composes meteorological observations which are conducted simultaneously to GPS measurements at the same points. Unless measurements are carried out at all points, observations from meteorological stations.

Effect of the troposphere on the vertical accuracy tropospheric propagation errors. Ground temperature (& “C), barometric pressure (* hPa) and humidity (* 3 %) measurements were also collected.

Portable dual-frequency ETH-CAPTEC WVRs (Biirki et al., ) were implemented with GPS .The geographical locations of data collection platforms (DCP) in the Brazilian Environmental Data Collection System are obtained by processing Doppler shift measurements between satellites and DCP.

When the signals travel from a DCP to a satellite crossing the terrestrial atmosphere, they are affected by the atmosphere layers, which generate a delay in the signal propagation, and cause errors Author: Áurea Aparecida da Silva, Wilson Yamaguti, Hélio Koiti Kuga, Cláudia Celeste Celestino.

Satellite measurements match model results apart from in the tropics. There is uncertainty with the tropical data due to how various teams correct for satellite drift. The U.S. Climate Change Science Program concludes the discrepancy is most likely due to data errors.