Results 91 to 100 of about 7,830 (211)

A Study of Standalone GNSS Positioning Precision in Covered Agricultural Environments: ETFE Polytunnels Versus Glass Greenhouses

open access: yesIET 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

A Practical Adaptive Clock Offset Prediction Model for the Beidou-2 System

open access: yesRemote Sensing, 2019
The predicted navigation satellite clock offsets are crucial to support real-time global navigation satellite system (GNSS) precise positioning applications, especially for those applications difficult to access the real-time data stream, such as the low
Beizhen Xu   +5 more
doaj   +1 more source

BeiDou Geostationary Satellite Code Bias Modeling Using Fengyun-3C Onboard Measurements

open access: yesSensors, 2017
This study validated and investigated elevation- and frequency-dependent systematic biases observed in ground-based code measurements of the Chinese BeiDou navigation satellite system, using the onboard BeiDou code measurement data from the Chinese ...
Kecai Jiang   +4 more
doaj   +1 more source

Sensitivity of GNSS-R spaceborne observations to soil moisture and vegetation [PDF]

open access: yes, 2016
Global navigation satellite systems-reflectometry (GNSS-R) is an emerging remote sensing technique that makes use of navigation signals as signals of opportunity in a multistatic radar configuration, with as many transmitters as navigation satellites are
Camps Carmona, Adriano José   +6 more
core   +2 more sources

Koneohjaus ja laserkeilausaineiston tuottaminen mallintamiseen [PDF]

open access: yes, 2018
Työn tavoitteena oli perehtyä koneohjauksen perusteisiin, paikannusmenetelmiin sekä ohjeistuksiin ja vaatimuksiin. Tavoitteena oli myös tarkastella, millä menetelmillä tuotettua laserkeilausaineistoa voidaan hyödyntää koneohjauksessa käytettävän ...
Toivanen, Tuomo
core  

High-Accuracy Phase Frequency Detection Technology Based on BDS Time and Frequency Signals

open access: yesSensors
For the time and frequency signals of Beidou satellites, a high-accuracy phase frequency detection technology based on phase group synchronization is proposed.
Baoqiang Du, Lanqin Tan
doaj   +1 more source

BDS Empowers Smart Water Conservancy Construction: Current Status, Challenges, and Future Opportunities [PDF]

open access: yesISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
The BeiDou Navigation Satellite System (BDS) is a critical spatial-temporal infrastructure in China, and since its inception, it has been widely applied across various socio-economic sectors.
Z. Pang   +5 more
doaj   +1 more source

Mass-Market Receiver for Static Positioning: Tests and Statistical Analyses [PDF]

open access: yes, 2011
Nowadays, there are several low cost GPS receivers able to provide both pseudorange and carrier phase measurements in the L1band, that allow to have good realtime performances in outdoor condition.
Cina, Alberto, Marucco, G., Piras, Marco
core  

Validation of the Accuracy and Convergence Time of Real Time Kinematic Results Using a Single Galileo Navigation System

open access: yesSensors, 2018
For the last two decades, the American GPS and Russian GLONASS were the basic systems used in global positioning and navigation. In recent years, there has been significant progress in the development of positioning systems.
Zbigniew Siejka
doaj   +1 more source

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