Home Projects Machine Learning for Rapid Propagation Assessment

The Challenge

Setting up effective communications networks in complex urban environments poses significant challenges, particularly in disaster or conflict zones where rapid deployment is crucial.

Traditionally, coverage prediction relies on physics-based simulators, but their time-intensive nature and reliance on high-performance computer platforms hinders quick decision-making. In time-critical scenarios, the urgent need to establish reliable communications networks necessitates a rapid and efficient alternative.

The Approach​

Our approach leverages the latest in Machine Learning (ML) technology for coverage prediction, enabling rapid transmitter placement optimisation in complex urban environments on standard computing hardware. ​

​We developed a proof-of-concept ML model suitable for the task and trained it on numerous coverage maps generated using conventional radio propagation tools – a process that required several days of compute time. Once trained, the ML model could accurately predict coverage for previously unseen terrains in a fraction of a second, using only a standard PC or laptop.​

The massive speed up this technique offers paves the way to optimisation of transmitter location by facilitating rapid exploration of transmitter locations that achieve desired coverage objectives. These optimised locations still only take a few seconds to compute, offering unprecedented speed and scalability in establishing effective and robust  communications networks.​

Machine Learning for Rapid Propagation Assessment
Machine Learning for Rapid Propagation Assessment

The Outcome

We have developed a cutting-edge coverage prediction ML model to optimise transmitter locations in complex urban environments, that can run on a conventional laptop or PC in seconds. ​

The swift optimisation makes this solution particularly suited to rapid deployments or situations which are subject to rapid change.

The video at the top of this page shows the propagation of a wave from a single transmitter through an urban terrain.

Related Technical Papers

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an image of our technical paper
The Kootwijk VLF Antenna: A Numerical Model

A comprehensive analysis of the historical Kootwijk VLF (Very Low Frequency, which covers 3-30 kHz) antenna, including the development of a numerical model to gain insight into its operation. The Kootwijk VLF antenna played a significant role in long-range communication during the early 20th century. The paper addresses the challenge of accurately modelling this electrically small antenna due to limited historical technical information and its complex design. The main goal is to understand if the antenna’s radiation efficiency might explain why “results were disappointing” for the Kootwijk to Malabar (Indonesia) communications link. Through simulations and comparisons with historical records, the numerical model reveals that the Kootwijk VLF antenna had a low radiation efficiency – about 8.9% – for such a long-distance link. This work discusses additional loss mechanisms in the antenna system that might not have been considered previously, including increased transmission-line losses as a result of impedance mismatch, wires having a lower effective conductivity than copper and inductor quality factors being lower than expected. The study provides insights into key antenna parameters, such as the radiation pattern, the antenna’s quality factor, half-power bandwidth and effective height, as well as the radiated power level and the power lost through dissipation. This research presents the first documented numerical analysis of the Kootwijk VLF antenna and contributes to a better understanding of its historical performance. While the focus has been at VLF, this work can aid future modelling efforts for electrically small antennas at other frequency bands.

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