Results 91 to 100 of about 12,906 (196)

An improved global pressure and zenith wet delay model with optimized vertical correction considering the spatiotemporal variability in multiple height-scale factors [PDF]

Geoscientific Model Development
Atmospheric pressure and zenith wet delay (ZWD) are essential for global navigation satellite system (GNSS) tropospheric correction and precipitable water vapor (PWV) retrieval. As the development progresses of real-time GNSS kinematic technology, moving
C. Jiang, C. Jiang, C. Jiang, X. Gao, H. Zhu, S. Wang, S. Liu, S. Chen, G. Liu   +8 more
doaj   +1 more source

Precise estimation of tropospheric path delays with GPS techniques [PDF]

Tropospheric path delays are a major source of error in deep space tracking. However, the tropospheric-induced delay at tracking sites can be calibrated using measurements of Global Positioning System (GPS) satellites.
Lichten, S. M.
core   +1 more source

A new algorithm for microwave delay estimation from water vapor radiometer data [PDF]

A new algorithm has been developed for the estimation of tropospheric microwave path delays from water vapor radiometer (WVR) data, which does not require site and weather dependent empirical parameters to produce high accuracy.
Robinson, S. E.
core   +1 more source

VLBI Astrometry of AGB Variables with VERA -- A Semiregular Variable S Crateris --

, 2008
We present a distance measurement for the semiregular variable S Crateris (S Crt) based on its annual parallax. With the unique dual beam system of the VLBI Exploration for Radio Astrometry (VERA) telescopes, we measured the absolute proper motion of a ...
Ando, Kazuma, 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, Maeda, Toshihisa, Manabe, Seiji, Maruyama, Kenta, Matsui, Makoto, Matsumoto, Naoko, Miyaji, Takeshi, Nagayama, Takumi, Nakagawa, Akiharu, Nakamura, Kayoko, Nyu, Daisuke, Oh, Chung Sik, Omodaka, Toshihiro, Oyama, Tomoaki, Pradel, Nicolas, Sakai, Satoshi, Sasao, Tetsuo, Sato, Katsuhisa, Sato, Mayumi, Shibata, Katsunori M., Suda, Hiroshi, Tamura, Yoshiaki, Tsushima, Miyuki, Ueda, Kousuke, Ueno, Yuji, Yamashita, Kazuyoshi   +42 more
core   +1 more source

Observation model and parameter partials for the JPL VLBI parameter estimation software MASTERFIT-1987 [PDF]

This report is a revision of the document of the same title (1986), dated August 1, which it supersedes. Model changes during 1986 and 1987 included corrections for antenna feed rotation, refraction in modelling antenna axis offsets, and an option to ...
Fanselow, J. L., Sovers, O. J.
core   +1 more source

Spacecraft-spacecraft very long baseline interferometry. Part 1: Error modeling and observable accuracy [PDF]

In Part 1 of this two-part article, an error budget is presented for Earth-based delta differential one-way range (delta DOR) measurements between two spacecraft.
Border, J. S., Edwards, C. D., Jr.
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Deep-space navigation with differenced data types. Part 3: An expanded information content and sensitivity analysis [PDF]

, 1992
An approximate six-parameter analytic model for Earth-based differential range measurements is presented and is used to derive a representative analytic approximation for differenced Doppler measurements.
Estefan, J. A., Thurman, S. W.
core   +1 more source

Test and evaluation of water vapor radiometers [PDF]

The accuracy of very long baseline interferometry in geodetic and astrometric applications is primarily limited by the propagation delays through the troposphere.
Moran, J.
core   +1 more source

Studies of regional and global tectonics and the rotation of the earth using very-long baseline interferometry [PDF]

Progress in the areas of data analysis, atmospheric delay calibration and software conversion is reported. Over 800 very long baseline interferometry (VLBI) experiments were analyzed in the last 6 months.
Shapiro, Irwin I.
core   +1 more source

Astrometry and geodesy with radio interferometry: experiments, models, results

, 1997
Summarizes current status of radio interferometry at radio frequencies between Earth-based receivers, for astrometric and geodetic applications. Emphasizes theoretical models of VLBI observables that are required to extract results at the present ...
Aoki, S., Argus, D. F., Argus, D. F., Argus, D. F., Baader, H.-R., Bare, C., Bartel, N., Bassiri, S., Batty, M. J., Bolton, J. G., Bowring, B. R., Brosche, P., Brosche, P., Brosche, P., Brosche, P., Broten, N. W., Burke, B. F., Carr, T. D., Carter, W. E., Cartwright, D. E., Chao, B. F., Chao, B. F., Charlot, P., Charlot, P., Charlot, P., Chen, G., Christopher S. Jacobs, Clark, T. A., Clark, T. A., Cohen, M. H., Cohen, M. H., Davidson, J. M., Davis, J. L., DeMets, C., DeMets, C., Dreyer, J. L. E., Edge, D. O., Einstein, A., Einstein, A., Elgered, G., Fairhead, L., Fallon, F. W., Fang, M., Fey, A. L., Fich, M., Folkner, W. M., Freedman, A. P., Fu, L. L., Fukushima, T., Fukushima, T., Gardner, C. S., Gardner, C. S., Gaspar, P., Gilbert, F., Gipson, J. M., Gross, R. S., Gwinn, C. R., Gwinn, C. R., Haas, R., Hartmann, T., Hartmann, T., Hartmann, T., Hellings, R. W., Henstock, D. R., Herring, T. A., Herring, T. A., Herring, T. A., Herring, T. A., Hinteregger, H. F., Hjellming, R. M., Ho, C. M., Hosokawa, M., Hubble, E. P., Jacobs, C. S., Jansky, K. G., Jansky, K. G., John L. Fanselow, Johnston, K. J., Kellermann, K. I., Kerr, F. J., Kinoshita, H., Kinoshita, H., Kogut, A., Kovalevsky, J., Le Provost, C., Lebach, D. E., Lestrade, J.-F., Lestrade, J.-F., Lieske, J. H., Linfield, R. P., Ma, C., Ma, C., MacDoran, P. F., MacMillan, D. S., MacMillan, D. S., MacMillan, D. S., Marcaide, J. M., Marini, J. W., Mathews, P. M., Mathews, P. M., Mathews, P. M., May, J., Minster, J. B., Mitrovica, J. X., Moran, J. M., Morgan, P. J., Moyer, T. D., Napier, P. J., Naudet, C. J., Niell, A. E., Ojars J. Sovers, Ong, K. M., Pagiatakis, S. D., Patnaik, A., Peltier, W. R., Piner, B. G., Polatidis, A. G., Pyne, T., Rabbel, W., Ray, J. R., Ray, J. R., Ray, R. D., Reber, G., Reber, G., Reid, M. J., Rius, A., Robertson, D. S., Robertson, D. S., Robertson, D. S., Robertson, D. S., Robertson, D. S., Rogers, A. E. E., Rogers, A. E. E., Rosen, R. D., Scherneck, H. G., Schmidt, M., Seidelmann, P. K., Seiler, U., Shahid-Saless, B., Shapiro, I. I., Shapiro, I. I., Smith, E. K., Sonett, C. P., Souchay, J., Sovers, O. J., Sovers, O. J., Sovers, O. J., Standish, E. M., Taylor, G. B., Teitelbaum, L. P., Thakkar, D. D., Thayer, G. D., Treuhaft, R. N., Treuhaft, R. N., Tushingham, A. M., van Dam, T. M., van Dam, T. M., van Vleck, J. H., Vigue, Y., Wade, C. M., Wade, C. M., Wahr, J. M., Wahr, J. M., Walter, H. G., Walter, H. G., Ward, S. N., Watkins, M. M., Webb, F. H., Williams, J. G., Williams, J. G., Williams, J. G., Wilson, B. D., Yahil, A., Yoder, C. F., Zebker, H. A., Zhu, S. Y., Zhu, S. Y.   +176 more
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