Results 1 to 10 of about 260,297 (259)

Design and Implementation of Opportunity Signal Perception Unit Based on Time-Frequency Representation and Convolutional Neural Network

Sensors, 2021
The traditional signal of opportunity (SOP) positioning system is equipped with dedicated receivers for each type of signal to ensure continuous signal perception. However, it causes a low equipment resources utilization and energy waste. With increasing
Zhongliang Deng, Hang Qi, Yanxu Liu, Enwen Hu   +3 more
doaj   +3 more sources

Forest canopy scattering properties with signal of opportunity reflectometry: theoretical simulations

Geoscience Letters, 2021
In recent years, signal of opportunity reflectometry (SoOp-R) has become a promising remote sensing technique. This emerging technique employs the reflected signals from existing Global Navigation Satellite System (GNSS) or communication satellites to ...
Xuerui Wu, Andrés Calabia, Jin Xu, Weihua Bai, Peng Guo   +4 more
doaj   +2 more sources

A Study on an Anti-Multiple Periodic Frequency Modulation (PFM) Interference Algorithm in Single-Antenna Low-Earth-Orbit Signal-of-Opportunity Positioning Systems

Remote Sensing
Signal-of-Opportunity (SOP) positioning based on Low-Earth-Orbit (LEO) constellations has gradually become a research hotspot. Due to their large quantity, wide spectral coverage, and strong signal power, LEO satellite SOP positioning exhibits robust ...
Lihao Yao, Honglei Qin, Hao Xu, Deyong Xian, Donghan He, Boyun Gu, Hai Sha, Yunchao Zou, Huichao Zhou, Nan Xu, Jiemin Shen, Zhijun Liu, Feiqiang Chen, Chunjiang Ma, Xiaoli Fang   +14 more
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Survey on positioning technology based on signal of opportunity from low earth orbit

Frontiers in Physics
Positioning, Navigation, and Timing (PNT) services are essential for supporting various aspects of modern society. Fields such as communications, transportation, and military operations heavily rely on accurate and reliable PNT services, with this ...
Jiawei He, Jiawei He, Shaojie Ni, Shaojie Ni, Honglei Lin, Honglei Lin, Zhe Liu, Zhe Liu, Zhibin Xiao, Zhibin Xiao   +9 more
doaj   +3 more sources

A Study on Anti-Jamming Algorithms in Low-Earth-Orbit Satellite Signal-of-Opportunity Positioning Systems for Unmanned Aerial Vehicles

Drones
Low-Earth-Orbit (LEO) satellite Signal-of-Opportunity (SOP) positioning technology has gradually matured to meet the accuracy requirements for unmanned aerial vehicle (UAV) positioning in daily scenarios.
Lihao Yao, Honglei Qin, Boyun Gu, Guangting Shi, Hai Sha, Mengli Wang, Deyong Xian, Feiqiang Chen, Zukun Lu   +8 more
doaj   +3 more sources

Overview of the system-level anti-jamming capability and developmental challenges of low-earth-orbit signal-of-opportunity

Frontiers in Physics
Signal-of-Opportunity (SOP) navigation based on Low-Earth-Orbit (LEO) satellite constellations has increasingly become a research hotspot. Due to the large number of LEO satellites, wide spectrum coverage, and strong signal power, LEO satellite Signal-of-
Lihao Yao, Lihao Yao, Bin Fan, Honglei Qin, Deyong Xian, Mengli Wang, Boyun Gu, Sumin Chen, Sumin Chen, Changhong Wang, Changhong Wang, Xuyu Wang, Jiemin Shen, Dongfang Jiang, Heng Wei, Haoyuan Yu, Bingjie Liu, Shuai Shao   +17 more
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A research on low-earth-orbit signal-of-opportunity interference suppression algorithm based on adaptive signal iterative subspace projection technique

Frontiers in Physics
Signal-of-Opportunity (SOP) positioning based on Low-Earth-Orbit (LEO) constellations has gradually become a research hotspot. LEO satellite SOP positioning possess strong anti-jamming capabilities due to their large quantity, wide spectral coverage, and
Lihao Yao, Lihao Yao, Bin Fan, Honglei Qin, Deyong Xian, Boyun Gu, Hai Sha, Gangqiang Guan, Zhijun Liu, Donghan He, Liwei Zhang   +10 more
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Practical Use of Starlink Downlink Tones for Positioning

Sensors, 2023
The large availability of Low Earth Orbit (LEO) satellite systems makes them useful beyond their original purposes, such as in positioning, where their signals can be passively used.
Nabil Jardak, Ronan Adam
doaj   +1 more source

PRN Sequence Estimation with a Self-Calibrating 40-Element Antenna Array

Navigation, 2023
This work explores the use of a low-cost global navigation satellite system (GNSS) antenna array including front-ends and a global navigation satellite system (GNSS) software receiver to receive signals of opportunity (SoO) whose pseudorandom noise (PRN)
Dominik Dötterböck, Thomas Pany, Roman Lesjak, Thomas Prechtl, Amir Tabatabaei   +4 more
doaj   +1 more source

LEO satellite communication and navigation symbiosis positioning management based on signal of opportunity

Dianxin kexue, 2023
Communication and navigation symbiosis refers to the coexistence of these signals in the satellite ecological environment.For single-function low-orbit satellite constellations for positioning or communication, it is difficult to quickly perform ...
Jie SHEN, Hui LIU, Jianbing RAO, Quan HE, Liyan BEN, Zhizhong WANG, Ying XIONG   +6 more
doaj   +2 more sources