Results 61 to 70 of about 23,654,929 (387)

Design of Satellite Operations Subsystem Using Dynamic Fault Management Mechanism [PDF]

Journal of Astronomy and Space Sciences, 1998
Satellite Operations Subsystem in the Mission Control Element provides real-time monitoring of the satellite status and transmits telecommands to control the satellite during the contact time.
Jaehoon Kim, Heesook Mo, Woonchan Jung
doaj  

Satellite retrieval system [PDF]

, 1983
A satellite retrieval system with first and second pairs of coacting parallel bars are separately mounted in spaced parallel planes on the front of a spacecraft.
Loughead, T. E., Pruett, E. C., Robertson, K. B.   +2 more
core   +1 more source

Use of Cyclone Global Navigation Satellite System (CyGNSS) Observations for Estimation of Soil Moisture

Geophysical Research Letters, 2018
Using the first full annual cycle of Cyclone Global Navigation Satellite System (CyGNSS) observations, we investigated the limitations and capabilities of CyGNSS observations for soil moisture (SM) estimates (0–5 cm).
Hyunglok Kim, V. Lakshmi
semanticscholar   +1 more source

Between Droughts and Floods: The Seasonal Response of Freshwater Snails in Artificial Reservoirs in the Brazilian Semiarid Region

Population Ecology, EarlyView.
We investigate the seasonal dynamics of two freshwater snails, Biomphalaria straminea and Melanoides tuberculata, in artificial reservoirs of the Brazilian semiarid region. Despite regulated hydrology, B. straminea exhibited strong seasonal fluctuations associated with dry periods, while M. tuberculata maintained stable populations throughout the year,
Lucas Henrique Sousa da Silva, João Hemerson de Sousa, Adriana Josefa da Rocha, Manuella Feitosa Leal, Lucas Ariel de Sousa Aguiar, Tamaris Gimenez Pinheiro, Edson Lourenço da Silva   +6 more
wiley   +1 more source

A Novel Weighted KNN Algorithm Based on RSS Similarity and Position Distance for Wi-Fi Fingerprint Positioning

IEEE Access, 2020
In Wi-Fi fingerprint positioning, what we should most care about is the distance relationship between the user and the reference points (RP). However, most of the existing weighted k-nearest neighbor (WKNN) algorithms use the Euclidean distance of ...
Boyuan Wang, Xingli Gan, Xuelin Liu, Baoguo Yu, Ruicai Jia, Lu Huang, Haonan Jia   +6 more
doaj   +1 more source

Satellite personal communications system [PDF]

, 1980
Voice channel communication between low power mobile stations dispersed over a large area is provided by a system which includes a geostationary satellite utilizing a large UHF antenna that can receive a transmission from a caller and retransmit it over ...
Reilly, N. B., Smith, J. G.
core   +1 more source

Dynamic Limits on Planar Libration-Orbit Coupling Around an Oblate Primary

, 2012
This paper explores the dynamic properties of the planar system of an ellipsoidal satellite in an equatorial orbit about an oblate primary. In particular, we investigate the conditions for which the satellite is bound in librational motion or when the ...
CM Hartzel, DA Mendis, David Richardson, DJ Griffiths, DJ Scheeres, DJ Scheeres, Douglas Mathews, DR Criswell, EG Fahnestock, ES Gawlik, F Gabern, Gina Ma, J Bellerose, Jared M. Maruskin, JE Colwell, Julie Bellerose, Lara Mitchell, Macken Wong, P Lee, RA Werner, TJ Linde, Tri Nguyen, Usha Ganeshalingam, V Guibout, X Wang, Y Nakajima   +25 more
core   +1 more source

An Adaptive Management Model for Brown Bears in Hokkaido: Based on Total Population and the Number of Nuisance Bears

Population Ecology, EarlyView.
Bear management changes management actions according to the horizontal axis of the population size and the vertical axis of the number of nuisance bears. Aiming for the target population size of Ntar, Actions I and II protect the bears, and Action IV reduces the population.
Hiroyuki Matsuda, Akira Maki, Tsutomu Mano, Hifumi Tsuruga, Hino Takafumi, Shinichi Horino   +5 more
wiley   +1 more source

Comparison of GRUAN RS92 and RS41 Radiosonde Temperature Biases

Atmosphere, 2021
In this study, we validated the consistency of the GRUAN RS92 and RS41 datasets, versions EDT.1 and GDP.2, in the upper troposphere and lower stratosphere (200–20 hPa), through dual launch campaigns at the GRUAN site and using the radio occultation (RO ...
Xin Jing, Xi Shao, Tung-Chang Liu, Bin Zhang   +3 more
doaj   +1 more source

Cartwheel satellite synchronization system Patent [PDF]

, 1970
Spin phase synchronization of cartwheel satellite in polar ...
Gatlin, J. A.
core   +1 more source