نتایج جستجو برای: satellite observations

تعداد نتایج: 348179  

ژورنال: فیزیک زمین و فضا 2020

A new approach with the ability to use the multiple observations based on the least square approach has been proposed for initial orbit determination. This approach considers the Earth’s Oblateness by using the developed Lagrange coefficients. The efficiency of the proposed method has been tested in two scenarios. The first scenario is to use the simulated and the second one is to utilize the r...

Farzaneh, Saeed, Parvazi, Kamal, Namazi, Bahare , Sharifi, Mohammad Ali ,

Although tidal observations which are extracted from coastal tide gages, have higher accuracy due to their higher sampling rate, installing these types of gages can impose some spatial limitation since we cannot use every part of sea to install them. To solve this limitation, we can employ satellite altimetry observations. However, satellite altimetry observations have lower sampling rate. Acco...

Determination of water vapor in the atmosphere plays an important role in forecasting weather conditions and precipitation studies. For this reason, it is very important to study the tropospheric delay, especially the wet component, which is due to the presence of water vapor in the atmosphere. In this paper, the amount of water vapor was estimated by altimeter satellite radiometer and GPS data...

ژورنال: فیزیک زمین و فضا 2014
A Safari H Amin I Foroughi M.A Sharifi

Gravity acceleration data have grand pursuit for marine applications. Due to environmental effects, marine gravity observations always hold a high noise level. In this paper, we propose an approach to produce marine gravity data using satellite altimetry, high-resolution geopotential models and harmonic splines. On the one hand, harmonic spline functions have great capability for local gravity ...

Journal: :فیزیک زمین و فضا 0
a safari department of surveying and geomatics engineering, university college of engineering, university of tehran, tehran, iran m.a sharifi department of surveying and geomatics engineering, university college of engineering, university of tehran, tehran, iran h amin department of surveying and geomatics engineering, university college of engineering, university of tehran, tehran, iran i foroughi department of surveying and geomatics engineering, university college of engineering, university of tehran, tehran, iran

gravity acceleration data have grand pursuit for marine applications. due to environmental effects, marine gravity observations always hold a high noise level. in this paper, we propose an approach to produce marine gravity data using satellite altimetry, high-resolution geopotential models and harmonic splines. on the one hand, harmonic spline functions have great capability for local gravity ...

Journal: :فیزیک زمین و فضا 0
محمد علی شریفی دانشیار، دانشکدة مهندسی نقشه برداری، پردیس دانشکده های فنی دانشگاه تهران مسعود عباس هادی دانشجوی دکتری، دانشکدة مهندسی نقشه برداری، پردیس دانشکده های فنی دانشگاه تهران محمد رضا سیف دانشجوی دکتری، دانشکدة مهندسی نقشه برداری، پردیس دانشکده های فنی دانشگاه تهران تقی شجاعی دانشجوی دکتری، مرکز تحقیقات ایرودینامیک، دانشگاه امام حسین

three-dimensional position measurements by global positioning system (gps) provide purely geometrical estimate of low earth orbiters (leos) positions. it provides uninterrupted tracking of the leos in three spatial dimensions or the so-called kinematic orbit. this solution relies heavily on the observations. high frequency observation noise, outlying observations and low redundancy number of me...

Journal: :فیزیک زمین و فضا 0
علیرضا آزموده اردلان دانشیار، گروه مهندسی نقشه برداری، قطب علمی مهندسی نقشه برداری و مقابلة با سوانح طبیعی، پردیس دانشکده های فنی، دانشگاه تهران، ایران محمدجواد طوریان دانش آموخته کارشناسی ارشد، گروه مهندسی نقشه برداری، پردیس دانشکده های فنی، دانشگاه تهران، ایران

based on 11 years of topex/poseidon satellite altimetry and coastal tide gauge sea level observations, four tidal constituents, namely o1, k1, m2 and s2, are modeled for the persian gulf and oman sea using a time-wise approach according to the following details. by selecting the cycle 100 as the reference, 772 points on 12 paths along the track of the altimetry satellite footprints over the per...

2007
Elana Judith Fertig Brian R. Hunt Harry Tamvakis Brian Hunt Edward Ott Istvan Szunyogh

Title of dissertation: ASSIMILATING SATELLITE OBSERVATIONS WITH A LOCAL ENSEMBLE KALMAN FILTER Elana Judith Fertig Doctor of Philosophy, 2007 Dissertation directed by: Professor Brian R. Hunt Department of Mathematics Numerical weather prediction relies on data assimilation to estimate the current state of the atmosphere. Generally speaking, data assimilation methods combine information from ob...

2004
A. Gettelman E. M. Weinstock E. J. Fetzer F. W. Irion A. Eldering E. C. Richard K. H. Rosenlof T. L. Thompson J. V. Pittman C. R. Webster R. L. Herman

[1] Aircraft observations from a recent campaign spanning 0–40N latitude are compared to coincident observations from satellite sensors on board the Aqua satellite of temperature, ozone, water vapor and cloud properties in the upper troposphere and lower stratosphere. Satellite observations compare well to aircraft data; temperature is generally within ±1.5 K and water vapor is within ±25% of a...

Journal: :Monthly Notices of the Royal Astronomical Society 1873

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