Mission concept and technology for spectroscopic observations of the coastal oceans from geosynchronous orbit

2005 ◽  
Author(s):  
Carl F. Bruce ◽  
A. Bingham ◽  
M. E. Carr ◽  
P. DiGiacomo ◽  
Robert O. Green
Keyword(s):  
Geosynchronous Orbit ◽  
Coastal Oceans ◽  
Spectroscopic Observations

Spectroscopic Observations of Visual Double Stars

1965 ◽  
Vol 5 ◽  
pp. 109-111
Author(s):  
Frederick R. West
Keyword(s):  
Radial Velocity ◽  
High Dispersion ◽  
Velocity Difference ◽  
Spectrograph Slit ◽  
Spectroscopic Observations ◽  
Double Stars ◽  
Visual Double Stars ◽  
Relative Orbit ◽  
Two Component ◽  
Star Images

There are certain visual double stars which, when close to a node of their relative orbit, should have enough radial velocity difference (10-20 km/s) that the spectra of the two component stars will appear resolved on high-dispersion spectrograms (5 Å/mm or less) obtainable by use of modern coudé and solar spectrographs on bright stars. Both star images are then recorded simultaneously on the spectrograph slit, so that two stellar components will appear on each spectrogram.

Models of Cataclysmic Variables from Photometric and Spectroscopic Data

1979 ◽  
Vol 46 ◽  
pp. 65-74 ◽  
Author(s):  
A.C. Fabian ◽  
J.E. Pringle ◽  
J.A.J. Whelan ◽  
J.A. Bailey
Keyword(s):  
Spectroscopic Data ◽  
Cataclysmic Variables ◽  
System Parameters ◽  
Dwarf Nova ◽  
Spectroscopic Observations ◽  
Photometric And Spectroscopic Observations

Abstract.Recent photometric and spectroscopic observations of the dwarf nova system Z Cha are discussed. Methods for constraining the system parameters are applied and the disc emissivity is deduced as a function of radius. Indications are found that the disc shrinks in size with increasing time after outburst.

scholarly journals Coastal Ocean Forecasting Science supported by GODAE OceanView Coastal Oceans and Shelf Seas Task Team (COSS-TT)—Part II

2021 ◽  
Author(s):  
Mauro Cirano ◽  
Guillaume Charria ◽  
Pierre De Mey-Frémaux ◽  
Vassiliki H. Kourafalou ◽  
Emil Stanev
Keyword(s):  
Coastal Ocean ◽  
Coastal Oceans ◽  
Shelf Seas ◽  
Task Team ◽  
Ocean Forecasting

First X-ray Spectroscopic Observations of Atmospheric Titanium Species: Size Dependence and the Emission Source

2021 ◽  
Author(s):  
Kohei Sakata ◽  
Yoshio Takahashi ◽  
Shotaro Takano ◽  
Atsushi Matsuki ◽  
Aya Sakaguchi ◽  
...  
Keyword(s):  
Size Dependence ◽  
Emission Source ◽  
X Ray ◽  
Spectroscopic Observations

scholarly journals Performance Analysis of the Korean Positioning System Using Observation Simulation

2020 ◽  
Vol 12 (20) ◽  
pp. 3365
Author(s):  
Byung-Kyu Choi ◽  
Kyoung-Min Roh ◽  
Haibo Ge ◽  
Maorong Ge ◽  
Jung-Min Joo ◽  
...  
Keyword(s):  
Precise Point Positioning ◽  
Service Area ◽  
Geosynchronous Orbit ◽  
Positioning System ◽  
Satellite Navigation System ◽  
Position Errors ◽  
Geo Satellites ◽  
Point Positioning ◽  
Ranging Errors ◽  
Rms Errors

The Korean government has a plan to build a new regional satellite navigation system called the Korean Positioning System (KPS). The initial KPS constellation is designed to consist of seven satellites, which include three geostationary Earth orbit (GEO) satellites and four inclined geosynchronous orbit (IGSO) satellites. KPS will provide an independent positioning, navigation, and timing (PNT) service in the Asia-Oceania region and can also be compatible with GPS. In the simulation for KPS, we employ 24 GPS as designed initially and 7 KPS satellites. Compared to the true orbit that we simulated, the averaged root mean square (RMS) values of orbit-only signal-in-space ranging errors (SISRE) are approximately 4.3 and 3.9 cm for KPS GEO and IGSO. Two different positioning solutions are analyzed to demonstrate the KPS performance. KPS standard point positioning (SPP) errors in the service area are about 4.7, 3.9, and 7.1 m for east (E), north (N), and up (U) components, respectively. The combined KPS+GPS SPP accuracy can be improved by 25.0%, 31.8%, and 35.0% compared to GPS in E, N, and U components. The averaged position errors for KPS kinematic precise point positioning (KPPP) are less than 10 cm. In the fringe of the KPS service area, however, the position RMS errors can reach about 40 cm. Unlike KPS, GPS solutions show high positioning accuracy in the KPS service area. The combined KPS+GPS can be improved by 28.7%, 27.1%, and 30.5% compared to GPS in E, N, and U components, respectively. It is noted that KPS can provide better performance with GPS in the Asia-Oceania region.

Sign in / Sign up

Export Citation Format

Share Document