Results 61 to 70 of about 2,562 (200)
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2016 Due to the ultra-long aperture time and large coverage characteristics of geosynchronous synthetic aperture radar (GEO SAR), the ionosphere freezing model in the traditional low earth orbit synthetic aperture radar (LEO SAR) imaging is assumed to fail in the GEO SAR, thus it should take the effects of the temporal–spatial variation (TSV) background ...
Cheng Hu +5 more
openaire +1 more source
Space Weather, Volume 24, Issue 2, February 2026.Abstract On 10 May 2024, a severe G5 geomagnetic storm—the most intense of solar cycle 25—significantly disturbed the global ionosphere. This study presents a comprehensive analysis using multi‐instrument observations, including ground‐based measurements from BDS‐GEO total electron content (TEC), digital ionosondes, and magnetometers; model outputs ...
Yue Sun +4 more
wiley +1 more source
Using GIS and Remote Sensing to build Master Sampling Frames for Agricultural Statistics [PDF]
, 2015 This report is a JRC contribution to the FAO Global Strategy to improve Agricultural and Rural Statistics (GSARS). Its aim is providing guidelines on the suitable ways to use satellite images and geographic information tools to build master sampling ...
GALLEGO PINILLA Francisco +2 more
core +1 more source
Space Weather, Volume 24, Issue 1, January 2026.Abstract Accurate modeling of traveling ionospheric disturbances (TIDs) is essential for characterizing their spatiotemporal variations and mitigating their effects on Global Navigation Satellite System (GNSS) precise positioning. This study develops a regional medium‐scale TID (MSTID) propagation model using BeiDou geostationary orbit (GEO) total ...
Dengkui Mei +5 more
wiley +1 more source
Sensors, 2016 The Chinese BeiDou navigation satellite system (BDS) aims to provide global positioning service by 2020. The combined use of BDS and Global Positioning System (GPS) is proposed to provide navigation service with more stringent requirements.
Shau-Shiun Jan, An-Lin Tao
doaj +1 more source
Remote Sensing, 2022 The Chinese BeiDou-3 navigation satellite system (BDS-3) is capable of transmitting both old B1I, B3I signals and new B1C, B2a, B2b signals. Current BDS-3 precise orbits are generally calculated using a B1I/B3I combination considering overlap with the ...
Bingfeng Tan, Qingsong Ai, Yunbin Yuan
doaj +1 more source
WFH: A Wideband Frequency Hopping‐Based Anti‐Jamming Navigation Signal Structure
IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.Given the limitations of existing satellite navigation signals in antijamming performance amid growing environmental jamming, this paper proposes a navigation signal structure based on wideband frequency hopping (WFH) modulation to enhance both antijamming capability and measurement accuracy. It further introduces the nonstationary effective carrier‐to‐
Chenyang Wang +4 more
wiley +1 more source
BeiDou-3 orbit and clock quality of the IGS Multi-GNSS Pilot Project
, 2022 Within the Multi-GNSS Pilot Project (MGEX) of the International GNSS Service (IGS), precise orbit and clock products for the BeiDou-3 global navigation satellite system (BDS-3) are routinely generated by a total of five analysis centers.
Deng, Zhiguo +5 more
core +1 more source
IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.The paper presents an experimental study of the standalone positioning performance of a high‐end survey grade and a mass‐market dual‐frequency GNSS receiver in covered agricultural environments (CAEs) comparing an ETFE polytunnel and a Cambridge‐style glass greenhouse against an open‐field baseline.
Alex Schofield +6 more
wiley +1 more source
Characteristics of Onefold Clocks of GPS, Galileo, BeiDou and GLONASS Systems
Sensors, 2021 This research is focused on searching for frequency and noise characteristics for available GNSS (Global Navigation Satellite Systems). The authors illustrated frequency stability and noise characteristics for a selected set of data from four different ...
Qingsong Ai +3 more
doaj +1 more source