Ionospheric Specification and Space Weather Forecasting With an HF Beacon Network in the Peruvian Sector: HF BEACONS
- Award ID(s):
- 1732209
- PAR ID:
- 10079899
- Date Published:
- Journal Name:
- Journal of Geophysical Research: Space Physics
- Volume:
- 123
- Issue:
- 8
- ISSN:
- 2169-9380
- Page Range / eLocation ID:
- 6851 to 6864
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
More Like this
-
Auroux, Denis; Biran, Paul; Donaldson, Simon; Mrowka, Tomasz (Ed.)We describe a weighted A-infinity algebra associated to the torus. We give a combinatorial construction of this algebra, and an abstract characterization. The abstract characterization also gives a relationship between our algebra and the wrapped Fukaya category of the torus. These algebras underpin the (unspecialized) bordered Heegaard Floer homology for three-manifolds with torus boundary, which will be constructed in forthcoming work.more » « less
-
Ionospheric conditions are variable in nature and can cause destructive interference to transmissions made in the High Frequency (HF) band, which ranges from 3-30 MHz. This poses a problem as the HF band is a critical fre- quency range for various applications (i.e. emergency, military). To manage these dynamic conditions, intelligent techniques should be implemented at the transmitter and receiver to properly maintain reliable communications. In this paper, we present work deriving components of a cognitive HF transceiver with agents called cognitive engines (CEs) operating at the transmitter and receiver. At the transmitter, cognition is employed to determine the combination of modulation and coding techniques that maximize throughput. At the receiver, cognition is implemented to derive the best parameters for equalization (i.e. tap length, step size, filter type, etc.) Results are presented showing that the individual components are able to satisfy their objectives. A discussion is also provided surveying recent research efforts pertaining to the development of cognitive methods for the Automatic Link Establishment (ALE) protocol, a common networking methodology for HF stations.more » « less
An official website of the United States government

