A. J. Stocker
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View article: Simulation of the Effect of Convecting Patches of Enhanced Electron Density on HF Over-the-Horizon Radars (OTHRs) in the Polar Regions
Simulation of the Effect of Convecting Patches of Enhanced Electron Density on HF Over-the-Horizon Radars (OTHRs) in the Polar Regions Open
High frequency Over-the-Horizon Radars (OTHR)provide an economical means to detect and track non-cooperativeair targets over large expanses of land and sea. Owing to thedynamic nature of the ionosphere, an OTHR requires a frequencymanageme…
View article: Observations of 5.9‐GHz Radio Propagation and 802.11p Network Performance at Road Junctions
Observations of 5.9‐GHz Radio Propagation and 802.11p Network Performance at Road Junctions Open
The propagation of 5.9‐GHz radio signals and performance of an 802.11p network were measured at three road junctions each having a different density of buildings. The maximum range for which acceptable performance (defined as where the pac…
View article: A Novel Method for Event Detection using Wireless Sensor Networks
A Novel Method for Event Detection using Wireless Sensor Networks Open
Reliable event detection is one of the hottest research areas in the wireless sensor networks field these days. Battlefield monitoring, fire detection, nuclear and chemical attack, and gas leak detection are examples of the event detection…
View article: An X Band Radio Channel Model for Propagation Through the Solar Corona
An X Band Radio Channel Model for Propagation Through the Solar Corona Open
Spacecraft communication systems operating at X band are strongly affected when the propagation path passes close to the Sun (which can be characterized by the Sun‐Earth‐Probe, SEP, angle). In this paper, a channel model that can generate …
View article: Developments in HF propagation predictions to support communications with aircraft on trans-polar routes
Developments in HF propagation predictions to support communications with aircraft on trans-polar routes Open
Commercial airlines began operations over polar routes in 1999 with a small number of proving flights. By 2014 the number had increased to in excess of 12,000 flights per year, and further increases are expected. For safe operations, the a…
View article: Progress towards a propagation prediction service for HF communications with aircraft on trans-polar routes
Progress towards a propagation prediction service for HF communications with aircraft on trans-polar routes Open
Progress towards a propagation prediction service for HF communications with aircraft on trans-polar routes
View article: Near real‐time input to a propagation model for nowcasting of HF communications with aircraft on polar routes
Near real‐time input to a propagation model for nowcasting of HF communications with aircraft on polar routes Open
There is a need for improved techniques for nowcasting and forecasting (over several hours) HF propagation at northerly latitudes to support airlines operating over the increasingly popular trans‐polar routes. In this paper the assimilatio…
View article: Comparison of Modelled and Observed Ionospheric HF Radio Propagation over the Polar Cap in Response to Solar Flares and a Weak CME of January 2014
Comparison of Modelled and Observed Ionospheric HF Radio Propagation over the Polar Cap in Response to Solar Flares and a Weak CME of January 2014 Open
Space weather events can have a range of disruptive effects on the ionosphere, especially in \nthe polar cap. This region is of growing importance for intercontinental air travel, lying across \nthe shortest path between significant destin…
View article: Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements
Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements Open
A real-time model of HF radio propagation conditions is being developed as a service for aircraft communications at high latitudes. An essential component of this is a real-time map of the absorption of HF (3-30 MHz) radio signals in the D…