Results 61 to 70 of about 961,733 (195)

LEO-Based Coarse Positioning Through Angle-of-Arrival Estimation of Signals of Opportunity

IEEE Access
This work introduces a novel coarse positioning system based on the estimation of the Angles-of-Arrival (AoAs) of Signals of Opportunity from a spacecraft in the Low Earth Orbit.
Antonello Florio, Noori Bnilam, Claudio Talarico, Paolo Crosta, Gianfranco Avitabile, Giuseppe Coviello   +5 more
doaj   +1 more source

Sensing Lunar Dust Density Using Radio Science Signals of Opportunity

Remote Sensing
Previous lunar missions, such as Surveyor, Apollo, and the Lunar Atmosphere and Dust Environment Explorer (LADEE), have played a pivotal role in advancing our understanding of the lunar exosphere’s dynamics and its relationship with solar wind flux.
Kamal Oudrhiri, Yu-Ming Yang, Daniel Erwin   +2 more
doaj   +1 more source

Early opportunity signals of a tipping point in the UK's second-hand electric vehicle market [PDF]

Earth System Dynamics
The use of early warning signals to detect the movement of natural systems towards tipping points is well established. Here, we explore whether the same indicators can provide early opportunity signals (EOSs) of a tipping point in a social dataset: views
C. A. Boulton, J. E. Buxton, T. M. Lenton   +2 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

ENDOGENOUS NOISE TRADERS [PDF]

We construct a parsimonious model of a financial market where the marginal investor is an endogenous noise trader. Such a trader anticipates that future shocks may force him to exit his position. In compensation he requires a higher return.
Salomonsson, Marcus
core  

Ocean Wave Period Measurements Using S-Band Signals of Opportunity Reflections

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Ocean wave periods are estimated using measurements of S-band signals-of-opportunity reflections from the sea surface. The measurements were collected on an oil platform and show a time evolving Doppler centroid frequency and spectral width due to the ...
James Gaudreau, Ethan Raines, Joel T. Johnson, James L. Garrison, Jeffrey D. Ouellette, Rashmi Shah   +5 more
doaj   +1 more source

DOA Robust Estimation of Echo Signals Based on Deep Learning Networks With Multiple Type Illuminators of Opportunity

IEEE Access, 2020
Traditional DOA estimation algorithms have poor adaptability to antenna errors. To enhance the direction of arrival (DOA) estimation performance for moving target echo signals in the environment of multiple type illuminators of opportunity, a DOA ...
Bo Hu, Mingqian Liu, Fei Yi, Hao Song, Fan Jiang, Fengkui Gong, Nan Zhao   +6 more
doaj   +1 more source

Toward Massive Satellite Signals of Opportunity Positioning: Challenges, Methods, and Experiments

Space: Science & Technology
Satellite signals of opportunity positioning (SSOOP) attempts to work out a navigation solution with many non-global navigation satellite systems (GNSS) satellite signals, when GNSS signals are not available.
Guangteng Fan, Xi Chen, Zhaoyue Chen, Ruichen Zhang, Peng Wu, Qihui Wei, Wenjun Xu, Jincheng Dai, Lu Cao   +8 more
doaj   +1 more source

Multicarrier Modulation as a Navigation Signal of Opportunity [PDF]

2008 IEEE Aerospace Conference, 2008
The global positioning system (GPS) generally provides worldwide high-accuracy positioning. However, GPS requires lines of sight to multiple satellites and may be blocked or jammed, hence backup navigation techniques are of interest. Navigation via signals of opportunity uses existing radio infrastructure as ad hoc navigational beacons.
Richard K. Martin, Jamie Velotta, John Raquet   +2 more
openaire   +1 more source

Time Variation of Liquidity in the Private Real Estate Market: An Empirical Investigation [PDF]

This paper characterizes the behavior of and evaluates competing explanations for time variation in private real estate market liquidity documented in Fisher et al. (2003).
Greg MacKinnon, Jim Clayton, Liang Peng
core