Results 31 to 40 of about 968,206 (211)

Unambiguous Acquisition/Tracking Technique Based on Sub-Correlation Functions for GNSS Sine-BOC Signals

Sensors, 2020
The autocorrelation function (ACF) of the Binary Offset Carrier modulation (BOC) signal for Global Navigation Satellite System (GNSS) has multiple peaks, ambiguity is easily generated during the synchronization of the baseband signal.
Fang Hao, Baoguo Yu, Xingli Gan, Ruicai Jia, Heng Zhang, Lu Huang, Boyuan Wang   +6 more
doaj   +1 more source

Evaluation of SNPP and NOAA-20 VIIRS Datasets Using RadCalNet and Landsat 8/OLI Data

Remote Sensing, 2022
In this study, we used RVUS data from RadCalNet as a benchmark to verify the radiometric accuracy and stability of operational and reprocessed SNPP/VIIRS data and the accuracy of NOAA-20/VIIRS data, as well as to assess the efficiency of the SNPP/VIIRS ...
Xin Jing, Sirish Uprety, Tung-Chang Liu, Bin Zhang, Xi Shao   +4 more
doaj   +1 more source

A Non-Linear Filtering Algorithm Based on Alpha-Divergence Minimization

Sensors, 2018
A non-linear filtering algorithm based on the alpha-divergence is proposed, which uses the exponential family distribution to approximate the actual state distribution and the alpha-divergence to measure the approximation degree between the two ...
Yarong Luo, Chi Guo, Jiansheng Zheng, Shengyong You   +3 more
doaj   +1 more source

Analytical Study on Mission Control Element System Availability for Korea Multipurpose Satellite (KOMPSAT) I [PDF]

Journal of Astronomy and Space Sciences, 1998
To estimate the availability of the MCE for KOMPSAT I, mathematical models of H/W and S/W availability, the availability estimating methods for parallel and redundant system were presented. Furthermore, to improve and estimate the MCE system availability,
J. W. Eun, D. I. Chang, J. M. Kim
doaj  

Using the Commercial GNSS RO Spire Data in the Neutral Atmosphere for Climate and Weather Prediction Studies

Remote Sensing, 2023
Recently, the NOAA has included GNSS (Global Navigation Satellite System) Radio Occultation (RO) data as one of the crucial long-term observables for weather and climate applications.
Shu-peng Ho, Xinjia Zhou, Xi Shao, Yong Chen, Xin Jing, William Miller   +5 more
doaj   +1 more source

Retrieving Precipitable Water Vapor From Shipborne Multi‐GNSS Observations [PDF]

, 2019
©2019. American Geophysical UnionPrecipitable water vapor (PWV) is an important parameter for climate research and a crucial factor to achieve high accuracy in satellite geodesy and satellite altimetry. Currently Global Navigation Satellite System (GNSS)
Ge, Maorong, Gerland, Sebastian, Ramatschi, Markus, Schuh, Harald, Semmling, Maximilian, Wang, Jungang, Wickert, Jens, Wu, Zhilu, Zus, Florian   +8 more
core   +1 more source

Consistency and Stability of SNPP ATMS Microwave Observations and COSMIC-2 Radio Occultation over Oceans

Remote Sensing, 2021
Radio occultation (RO) sensor measurements have critical roles in numerical weather prediction (NWP) by complementing microwave and infrared sounder measurements with information of the atmospheric profiles at high accuracy, precision, and vertical ...
Xi Shao, Shu-peng Ho, Bin Zhang, Changyong Cao, Yong Chen   +4 more
doaj   +1 more source

Spire RO Thermal Profiles for Climate Studies: Initial Comparisons of the Measurements from Spire, NOAA-20 ATMS, Radiosonde, and COSMIC-2

Remote Sensing, 2023
Global Navigation Satellite System (GNSS) Radio Occultation (RO) data play an essential role in improving numerical weather prediction (NWP) and monitoring climate change.
Xin Jing, Shu-Peng Ho, Xi Shao, Tung-Chang Liu, Yong Chen, Xinjia Zhou   +5 more
doaj   +1 more source

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 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