Results 101 to 110 of about 5,434 (212)

Microwave radiometry as a tool to calibrate tropospheric water-vapor delay [PDF]

Microwave radiometers were used to measure the emission line due to the water vapor molecules of atmospheric emission. Four separate field tests were completed which compared radiometers to other techniques which measure water vapor.
Claflin, E. S., Resch, G. M.
core   +1 more source

Determination of GPS orbits to submeter accuracy [PDF]

Orbits for satellites of the Global Positioning System (GPS) were determined with submeter accuracy. Tests used to assess orbital accuracy include orbit comparisons from independent data sets, orbit prediction, ground baseline determination, and formal ...
Bertiger, W. I., Katsigris, E. C., Lichten, S. M.   +2 more
core   +1 more source

Wet Refractivity tomographic reconstruction over small areas using an ad-hoc GPS receivers network [PDF]

, 2011
One of the most attractive scientific issues in the use of GNSS (Global Navigation Satellite System) signal from a meteorological point of view, is the retrieval of high resolution tropospheric water vapour maps.
Cucca, Manuela, Notarpietro, Riccardo, Venuti, G.   +2 more
core  

Distance to Orion KL Measured with VERA

, 2007
We present the initial results of multi-epoch VLBI observations of the 22 GHz H2O masers in the Orion KL region with VERA (VLBI Exploration of Radio Astrometry).
Bushimata, Takeshi, Choi, Yoon Kyung, Hirota, Tomoya, Honma, Mareki, Imai, Hiroshi, Iwadate, Kenzaburo, Jike, Takaaki, Kameno, Seiji, Kameya, Osamu, Kamohara, Ryuichi, Kan-ya, Yukitoshi, Kawaguchi, Noriyuki, Kijima, Masachika, Kim, Mi Kyoung, Kobayashi, Hideyuki, Kuji, Seisuke, Kurayama, Tomoharu, Manabe, Seiji, Maruyama, Kenta, Matsui, Makoto, Matsumoto, Naoko, Miyaji, Takeshi, Nagayama, Takumi, Nakagawa, Akiharu, Nakamura, Kayoko, Oh, Chung Sik, Omodaka, Toshihiro, Oyama, Tomoaki, Sakai, Satoshi, Sasao, Tetsuo, Sato, Katsuhisa, Sato, Mayumi, Shibata, Katsunori M., Shintani, Motonobu, Tamura, Yoshiaki, Tsushima, Miyuki, Yamashita, Kazuyoshi   +36 more
core   +1 more source

Error estimation for ORION baseline vector determination [PDF]

Effects of error sources on Operational Radio Interferometry Observing Network (ORION) baseline vector determination are studied. Partial derivatives of delay observations with respect to each error source are formulated. Covariance analysis is performed
Wu, S. C.
core   +1 more source

The effect of spatial and temporal wet-troposphere fluctuations on connected element interferometry [PDF]

Numerical integrations of the structure function of tropospheric inhomogeneities have been performed to assess the impact of water vapor fluctuations on connected element interferometry (CEI).
Edwards, C. D.
core   +1 more source

Distance to NGC 281 in a Galactic Fragmenting Superbubble: Parallax Measurements with VERA

, 2008
We have used the Japanese VLBI array VERA to perform high-precision astrometry of an H2O maser source in the Galactic star-forming region NGC 281 West, which has been considered to be part of a 300-pc superbubble. We successfully detected a trigonometric
Bushimata, Takeshi, Choi, Yoon Kyung, Hirota, Tomoya, Honma, Mareki, Imai, Hiroshi, Iwadate, Kenzaburo, Jike, Takaaki, Kameno, Seiji, Kameya, Osamu, Kamohara, Ryuichi, Kan-ya, Yukitoshi, Kawaguchi, Noriyuki, Kim, Mi Kyoung, Kobayashi, Hideyuki, Kuji, Seisuke, Kurayama, Tomoharu, Manabe, Seiji, Matsui, Makoto, Matsumoto, Naoko, Miyaji, Takeshi, Nagayama, Takumi, Nakagawa, Akiharu, Nakamura, Kayoko, Oh, Chung Sik, Omodaka, Toshihiro, Oyama, Tomoaki, Sakai, Satoshi, Sasao, Tetsuo, Sato, Katsuhisa, Sato, Mayumi, Shibata, Katsunori M., Tamura, Yoshiaki, Yamashita, Kazuyoshi   +32 more
core   +2 more sources

Combination of long time-series of troposphere zenith delays observed by VLBI

Journal of Geodesy, 2007
Within the International Very Long Baseline Interferometry (VLBI) Service for Geodesy and Astrometry (IVS), long time-series of zenith wet and total troposphere delays have been combined at the level of parameter estimates. The data sets were submitted by eight IVS Analysis Centers (ACs) and cover January 1984 to December 2004.
Heinkelmann, R., Böhm, J., Schuh, H., Bolotin, S., Engelhardt, G., MacMillan, D., Negusini, M., Skurikhina, E., Tesmer, V., Titov, O.   +9 more
openaire   +5 more sources

Evaluation of the Zenith Tropospheric Delay (ZTD) Derived from VMF3_FC and VMF3_OP Products Based on the CMONOC Data

Atmosphere
Prior tropospheric information, especially zenith tropospheric delay (ZTD), is particularly important in GNSS data processing. The two types of ZTD models, those that require and do not require meteorological parameters, are the most commonly used models,
Haoran Zhang, Liang Chen, Fei Yang, Jingge Ma, Junya Zhang, Wenyu Sun, Shiqi Xu   +6 more
doaj   +1 more source

Tropospheric monitoring technology for gravity wave experiments [PDF]

Tropospheric refractivity fluctuations are an important error source for gravity wave detection by Doppler tracking in that they alter the phase and phase rate of electromagnetic signals. Estimates are presented of the effect of tropospheric fluctuations
Resch, G. M., Treuhaft, R. N.
core   +1 more source