Results 51 to 60 of about 150,096 (147)

Method and apparatus for calibrating the ionosphere and application to surveillance of geophysical events [PDF]

, 1984
The columnar electron content of the ionosphere between a spacecraft and a receiver is measured in realtime by cross correlating two coherently modulated signals transmitted at different frequencies (L1,L2) from the spacecraft to the receiver using a ...
Macdoran, P. F.
core   +1 more source

Range-Free Localization with the Radical Line

, 2010
Due to hardware and computational constraints, wireless sensor networks (WSNs) normally do not take measurements of time-of-arrival or time-difference-of-arrival for rangebased localization.
Chan, Y. T., Chen, Hongyang, Poor, H. Vincent, Sezaki, Kaoru   +3 more
core   +1 more source

Localization of electromagnetic radiating sources in the near-field of a uniform circular array [PDF]

, 2006
In this paper we present a parameter estimation problem for practical electromagnetic signals generated by dipóle antennas positioned close to a receiving antenna of uniform circular array (UCA).
Abedin, MJ, Mohan, AS
core   +1 more source

Enhanced Moving Source Localization with Time and Frequency Difference of Arrival: Motion-Assisted Method for Sub-Dimensional Sensor Networks

Applied Sciences
Localizing a moving source by Time Difference of Arrival (TDOA) and Frequency Difference of Arrival (FDOA) commonly requires at least N+1 sensors in N-dimensional space to obtain more than N pairs of TDOAs and FDOAs, thereby establishing more than 2N ...
Xu Yang
doaj   +1 more source

Optimal Sensor Deployment and Velocity Configuration With Hybrid TDOA and FDOA Measurements

IEEE Access, 2019
Source localization based on the hybrid time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA) measurements from distributed sensors is an essential problem in wireless sensor networks (WSNs).
Weijia Wang, Peng Bai, Yubing Wang, Xiaolong Liang, Jiaqiang Zhang   +4 more
doaj   +1 more source

Dynamic W-CDMA network planning using mobile location [PDF]

, 2002
Location assisted dynamic network planning enables an operator to obtain geographic specific performance estimates and automatically redistribute radio resources.
Nix, AR, Sharma, S
core   +2 more sources

A Novel Joint Localization Method for Acoustic Emission Source Based on Time Difference of Arrival and Beamforming

Applied Sciences, 2020
Time difference of arrival (TDOA) method and beamforming method are often individually utilized in the localization of acoustic emission source of a plate.
Xiaoran Wang, Xiandong Liu, Tian He, Junfei Tai, Yingchun Shan   +4 more
doaj   +1 more source

Experimental performance evaluation of outdoor TDoA and RSS positioning in a public LoRa network [PDF]

, 2018
This paper experimentally compares the positioning accuracy of TDoA-based and RSS-based localization in a public outdoor LoRa network in the Netherlands.
Joseph, Wout, Martens, Luc, Plets, David, Podevijn, Nico, Trogh, Jens   +4 more
core   +2 more sources

Detecting of Gunshots Direction Using TDOA (Time Difference of Arrival)

Emitor: Jurnal Teknik Elektro
In order to avoid shots being fired in undesirable areas, a device is required that can detect the origin of the shot so that the source of the bullet can be identified. This research was conducted to maintain the security and stability of a region.
Risdilah Mimma Untsa, Fannush Shofi Akbar, Arrizky Ayu Faradila Purnama, M Muhsin, Nilla Rachmaningrum   +4 more
doaj   +1 more source

Study on joint passive localization using time difference of arrival and frequency difference of arrival to improve the accuracy of four-satellite localization

Advances in Mechanical Engineering, 2017
In order to reduce the influence of time-difference-of-arrival measurement error on localization accuracy of time-difference-of-arrival-based four-satellite localization, we first introduce the frequency-difference-of-arrival information to the existing ...
Guo Xiansheng, Lu Haoran, Zhang Yan, Zeng Botao, Guo Yebo   +4 more
doaj   +1 more source