Results 221 to 230 of about 249,513 (267)

Positioning Based on Signals of Opportunity

IEEE Communications Letters, 2014
A novel approach to opportunistic positioning based on timing measurements is presented. The asynchronous radio transmissions from fixed stations and from mobile GPS-equipped nodes are jointly exploited to cooperatively localize a blind node. To this end, a weighted least-squares (WLS) estimator is proposed; its effectiveness is illustrated via ...
COLUCCIA, ANGELO, RICCIATO, FABIO, RICCI, Giuseppe   +2 more
openaire   +1 more source

Topological Localization Via Signals of Opportunity

IEEE Transactions on Signal Processing, 2012
We consider problems of localization, disambiguation, and mapping in a domain filled with signals-of-opportunity generated by transmitters. One or more (static or mobile) receivers utilize these signals and from them characterize the domain, localize, disambiguate, etc.
Michael Robinson, Robert Ghrist
openaire   +1 more source

Ocean altimetry using wideband signals of opportunity

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
Coastal altimetry plays a prominent role in measuring the total water-level envelope directly, and is one of the key measurements required by storm surge applications and services. It can also provide important information about the wave field, leading to development of more realistic wave models and therefore improving forecasts of wave setup and ...
Rashmi Shah, James Garrison, Soon Chye Ho, Priscilla N. Mohammed, Jeffrey R. Piepmeier, Adam Schoenwald, Randeep Pannu, Asmita Korde-Patel, Damon Bradley   +8 more
openaire   +1 more source

Anomaly Detection Using WiFi Signals of Opportunity

2019 13th International Conference on Signal Processing and Communication Systems (ICSPCS), 2019
Detection of changes in indoor areas and controlled environments is getting increasing interest in ambient intelligence and security. In this paper, we propose a radio-frequency (RF)based anomaly detector that, observing the spectrum received from signals of opportunity (SoOp) and exploiting machine learning (ML) techniques, is capable of revealing ...
Elia Favarelli, Enrico Testi, Lorenzo Pucci, Marco Chiani, Andrea Giorgetti   +4 more
openaire   +2 more sources

Cooperative position location with signals of opportunity

Proceedings of the IEEE 2009 National Aerospace & Electronics Conference (NAECON), 2009
When the reception of GPS signals becomes unreliable, an alternative is to explore signals of opportunity (SOOP) for positioning. Broadcast digital radio transmissions (e.g., digital TV signals) contain field and segment sync codes, which can be used for ranging even though it was not originally designed for so.
Chun Yang, Thao Nguyen, Donald Venable, Matthew White, Rich Siegel   +4 more
openaire   +1 more source

Investment as the Opportunity Cost of Dividend Signaling

The Accounting Review, 2021
ABSTRACT We provide evidence that dividends signal sustainable earnings generated by assets-in-place for firms with weak investment opportunities. In the cross-section, both dividend levels and changes contain more earnings information among firms with weaker investment opportunities.
Zachary Kaplan, Gerardo Pérez-Cavazos
openaire   +1 more source

Measurement of atmospheric refractivity using signals of opportunity

2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
High-resolution numerical weather models require fine-scale (1–5 km) measurements of moisture fields over large areas (>20,000 km2). Existing techniques such as GPS are not able to meet these requirements. This paper discusses the feasibility of a novel method for measuring atmospheric refractivity by the opportunistic reception and processing of ...
R. J. Watson, B. Wiltshire, N. Dumont, C. J. Coleman   +3 more
openaire   +1 more source

Navigation by inertial device and signals of opportunity

Signal Processing, 2017
Inertial navigation systems are known to yield rather accurate measurements over short time intervals, while their error variance tends to increase with time. In order to keep the error within specification most systems use GPS signals. In the absence of GPS data, due to jamming or spoofing, it is desirable to use signals of opportunity instead.
Haim Simkovits, Anthony J. Weiss, Alon Amar   +2 more
openaire   +1 more source

Airborne antenna array calibration with signals of opportunity

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013
An approach is presented for in-situ calibration of an airborne antenna array using a signal of opportunity. In-situ calibration requires determining location of the unknown signal, the array's response in the direction of the signal, and the application of updates to the stored antenna response.
Andrew Kintz, Inder J. Gupta
openaire   +1 more source

Situation assisted indoor localization using signals of opportunity

2014 International Conference on Indoor Positioning and Indoor Navigation (IPIN), 2014
Development of an accurate, less-complexity indoor positioning system using Smartphone is the scope of this research. In an indoor environment, a Smartphone can communicate with the signals of opportunity. The signals for experimentation include Wi-Fi, Bluetooth, GSM and optical signals which will almost be available in all the buildings and a ...
Karthick Nanmaran, B. Amutha
openaire   +1 more source