Maritime Ad-Hoc Network Using Multi-Beam Antennas
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Solution Overview
Problem
Current mobile ad-hoc networks (MANETs) face challenges in maritime environments due to power limitations and coordination issues, especially when trying to maintain connectivity over long distances and avoid interference, and existing solutions like satellite communication are costly and not suitable for true multicast and spatial proximity requirements.
Innovation Solution
The implementation of a Multi-Beam Antenna (MBA) approach combined with a Distributed Neighbour Discovery (DND) process, which uses spatial diversity to manage power bundling and neighbourhood discovery, establishing dedicated links between peer nodes without shared radio channels, allowing for high capacity, flexibility, and self-healing communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power bundling is implemented interferometrically to solve the power problem, then transmission power is improved, but coordination complexity increases due to multiple nodes accessing the same radio channel
Solution Approach 1:
The patent segments the radio communication into multiple spatial channels using directional antennas. Each antenna element creates a separate spatial channel, allowing simultaneous transmissions without interference. This segmentation resolves the contradiction by maintaining high transmission power while eliminating the need for complex coordination on shared channels.
Solution Approach 2:
The patent introduces a spatial dimension to radio communication by using directional antennas with specific beamforming capabilities. Instead of sharing a single omnidirectional channel, nodes communicate through spatially separated directional channels. This dimensional change allows power bundling without coordination complexity because each spatial channel is inherently isolated from others.
2Reliability
If satellite communication is used to achieve ad-hoc networking at sea, then connectivity is improved, but operational cost increases significantly
Solution Approach 1:
The patent implements a self-organizing MANET where nodes automatically discover neighbors, establish connections, and route data without external infrastructure or satellite support. Each node independently manages its own connectivity through distributed neighbor discovery protocols, eliminating the need for expensive satellite services while maintaining reliable ad-hoc networking capability.
3Area of stationary object
If omni-directional satellite antennae are used, then coverage is improved, but security deteriorates due to easy eavesdropping
Solution Approach 1:
The patent applies local quality by using directional antennas that concentrate transmission energy in specific spatial directions rather than omnidirectional broadcasting. Each node transmits only toward its intended neighbor through precisely directed beams, providing inherent physical layer security. This localized transmission maintains adequate coverage for ad-hoc networking while eliminating the eavesdropping vulnerability of omni-directional systems.
4Object-affected harmful factors
If directional antennae are used, then security is improved by localizing radiation, but node complexity increases due to continuous alignment requirements
Solution Approach 1:
The patent implements self-aligning directional antennas that automatically track and maintain orientation toward neighboring nodes through distributed neighbor discovery protocols. Nodes independently adjust their antenna beam directions based on received signals from neighbors, eliminating the need for complex external alignment systems. This self-service approach maintains security through localized radiation while reducing node complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution achieves scalable, flexible, and self-healing MANETs that overcome power and coordination challenges, providing secure and efficient communication by localizing radiation to intended recipients and minimizing eavesdropping risks, while being cost-effective and adaptable to maritime conditions.
Implementation Method 1
a given peer node can be reached by an RF signal transmitted via a trajectory that can be contained within the Fresnel zone between the node and a given peer node
Data Source
Figure 1
Figure 2a~2c
Figure 3
AI summary
There is disclosed a network comprising peer nodes only, the network comprises more than two mobile peer nodes. Each node comprises a plurality of wireless air interfaces and means for discovering neighbour peer nodes that are in line-of-sight. Application : networking at sea, land or air.