Results 31 to 40 of about 8,787 (210)

Study on LOS to Vertical Deformation Conversion Model on Embankment Slopes Using Multi-Satellite SAR Interferometry

ISPRS International Journal of Geo-Information
Slant range geometry plays a crucial role in interpreting synthetic aperture radar (SAR) observations, especially in converting line-of-sight (LOS) surface deformations to actual vertical subsidence. This paper proposes a new conversion model to retrieve
Jie Liu, Tao Li, Sijie Ma, Qiang Shan, Weiping Jiang   +4 more
doaj   +1 more source

A Minimal Solution for Binocular Camera Relative Pose Estimation Based on the Gravity Prior

Remote Sensing
High-precision positioning is the foundation for the functionality of various intelligent agents. In complex environments, such as urban canyons, relative pose estimation using cameras is a crucial step in high-precision positioning. To take advantage of
Dezhong Chen, Kang Yan, Hongping Zhang, Zhenbao Yu   +3 more
doaj   +1 more source

A Minimal Solution Estimating the Position of Cameras with Unknown Focal Length with IMU Assistance

Drones
Drones are typically built with integrated cameras and inertial measurement units (IMUs). It is crucial to achieve drone attitude control through relative pose estimation using cameras. IMU drift can be ignored over short periods.
Kang Yan, Zhenbao Yu, Chengfang Song, Hongping Zhang, Dezhong Chen   +4 more
doaj   +1 more source

LEO Enhanced Global Navigation Satellite System (LeGNSS): progress, opportunities, and challenges

Geo-spatial Information Science, 2021
With the completion of Chinese BeiDou Navigation Satellite System (BDS), the world has begun to enjoy the Positioning, Navigation, and Timing (PNT) services of four Global Navigation Satellite Systems (GNSS).
Haibo Ge, Bofeng Li, Song Jia, Liangwei Nie, Tianhao Wu, Zhe Yang, Jingzhe Shang, Yanning Zheng, Maorong Ge   +8 more
doaj   +1 more source

Performance of GNSS-SDR for IRNSS L5 Signals Using a Low-Cost RF Front-End

Navigation, 2023
The GNSS software receiver has evolved as a promising tool for researchers and developers because of its flexibility and reconfigurability. As modernized GNSS signals have been emerging day by day, the need to adapt the software receiver to address the ...
Chittimalla Srinu, Laxminarayana Parayitam   +1 more
doaj   +1 more source

Analysis of the Dihedral Corner Reflector’s RCS Features in Multi-Resource SAR

Applied Sciences
Artificial corner reflectors are widely used in the vegetated landslide for time series InSAR monitoring due to their permanent scattering features. This paper investigated the RCS features of a novel dihedral CR under multi-resource SAR datasets. An RCS
Jie Liu, Tao Li, Sijie Ma, Yangmao Wen, Yanhao Xu, Guigen Nie   +5 more
doaj   +1 more source

Principle and performance of multi-frequency and multi-GNSS PPP-RTK

Satellite Navigation, 2022
PPP-RTK which takes full advantages of both Real-Time Kinematic (RTK) and Precise Point Positioning (PPP), is able to provide centimeter-level positioning accuracy with rapid integer Ambiguity Resolution (AR).
Xingxing Li, Bo Wang, Xin Li, Jiaxin Huang, Hongbo Lyu, Xinjuan Han   +5 more
doaj   +1 more source

Globally Optimal Relative Pose and Scale Estimation from Only Image Correspondences with Known Vertical Direction

ISPRS International Journal of Geo-Information
Installing multi-camera systems and inertial measurement units (IMUs) in self-driving cars, micro aerial vehicles, and robots is becoming increasingly common.
Zhenbao Yu, Shirong Ye, Changwei Liu, Ronghe Jin, Pengfei Xia, Kang Yan   +5 more
doaj   +1 more source

Global capabilities of BeiDou Navigation Satellite System

Satellite Navigation, 2020
The BeiDou Navigation Satellite System (BDS) has completed the constellation deployment and started to provide global services. After achieving the capabilities of global coverage, global first-class accuracy for Positioning, Navigation and Timing (PNT),
Jun Lu, Xia Guo, Chengeng Su
doaj   +1 more source

An evaluation of GNSS radio occultation atmospheric profiles from Sentinel-6

Egyptian Journal of Remote Sensing and Space Sciences, 2023
The Global Navigation Satellite System (GNSS) radio occultation (RO) significantly impacts climate change monitoring. GNSS RO is based mainly on the refraction of the GNSS signals transmitted by satellites and received by a receiver on a Low Earth Orbit (
Mohamed Zhran
doaj   +1 more source