Results 11 to 20 of about 63,794 (294)
Doppler Differential Positioning Technology Using the BDS/GPS Indoor Array Pseudolite System
Sensors, 2019 A Global Satellite Navigation System (GNSS) cannot provide normal location services in an indoor environment because the signals are blocked by buildings.
Xingli Gan +7 more
doaj +3 more sources
4D RADAR/IMU/GNSS INTEGRATED POSITIONING AND MAPPING FOR LARGE-SCALE ENVIRONMENTS [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2023 4D millimeter-wave radar can work in harsh weather conditions such as fog and snow, and measure the position and radial Doppler velocity of objects in three-dimensional space. Some existing methods perform positioning by fusing 3D velocity or point cloud
B. Wang, Y. Zhuang, N. El-Bendary
doaj +1 more source
The Inter-Mammary Sticky Roll: A Novel Technique for Securing a Doppler Ultrasonic Probe to the Precordium for Venous Air Embolism Detection. [PDF]
, 2016 Venous air embolism is a devastating and potentially life-threatening complication that can occur during neurosurgical procedures. We report the development and use of the "inter-mammary sticky roll," a technique to reliably secure a precordial Doppler ...
Drummond, John C +5 more
core +2 more sources
Position of first Doppler peak [PDF]
Second international workshop on particle physics and the early universe (COSMO-98), 1999 This talk describes an analytic calculation of the position of the first accoustic peak as a function of the matter density and the cosmological constant (work with Y.J. Ng and R. Rohm), agreeing with independent numerical studies. There is also discussion of supernovae observations and how together these approaches combine to suggest non-zero ...
openaire +2 more sources
Ambiguity Resolution for Satellite Doppler Positioning Systems [PDF]
IEEE Transactions on Aerospace and Electronic Systems, 1979 The implementation of satellite-based Doppler positioning systems frequently requires the recovery of transmitter position from a single pass of Doppler data. The least-squares approach to the problem yieds conjugate solutions on either side of the satellite subtrack.
P. Argentiero, J. Marint
openaire +1 more source
Mobile ultrasonic transducer positioning
The Journal of Engineering, 2017 For positioning a moving ultrasonic transmitter, most of the existing ultrasonic positioning systems require the use of a bank of correlators to estimate the Doppler shift associated with its movement which require high computational complexity.
Mohammad Omar Khyam +3 more
doaj +1 more source
Positioning of High-speed Trains using 5G New Radio Synchronization Signals [PDF]
, 2018 We study positioning of high-speed trains in 5G new radio (NR) networks by utilizing specific NR synchronization signals. The studies are based on simulations with 3GPP-specified radio channel models including path loss, shadowing and fast fading effects.
Koivisto, Mike +5 more
core +2 more sources
Simulation Analysis of the Geometric Positioning Accuracy for MEO- and HEO-SAR Satellites
Remote Sensing, 2023 Due to the long synthetic aperture time, the large squint angle, and the large imaging width of medium Earth orbit (MEO) and high Earth orbit (HEO) SAR satellites, it is difficult to simulate the geometric positioning accuracy of MEO- and HEO-SAR ...
Ruishan Zhao +5 more
doaj +1 more source
Sensors, 2021 Due to the low signal power, the Global Navigation Satellite System (GNSS) signal is vulnerable to interference and even cannot be captured or tracked in harsh environments.
Li Cheng +3 more
doaj +1 more source
Research on Multi-Parameter Optimization of Indoor WiFi Positioning Technology [PDF]
Jisuanji gongcheng, 2021 The existing WiFi-based indoor positioning technology is affected by the number of antennas and channel bandwidth, and has the problems of low positioning accuracy and frequent tracking failures.To address the problem, a multi-parameter indoor passive ...
WANG Yingying, CHANG Jun, WU Hao
doaj +1 more source