Retroreflector Laser Node for Low-Detectability Drone Links
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Solution Overview
Problem
Existing laser communication systems in military applications are challenging due to the need for compact, light-weight, and undetectable designs, especially when used on agile platforms, and the difficulty in hiding communication from third parties.
Innovation Solution
A network node for a non-detectable laser communication system that employs a reflector device to generate a reflected laser beam without a laser source, using modulation techniques to adapt the beam for communication, and an omni-directional retroreflector to reduce detectability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser source is integrated into each network node for bi-directional communication, then communication reliability is improved, but device weight and complexity increase
Solution Approach 1:
The laser source is extracted from the network node and relocated to a centralized location (base station or ground station). The network node retains only the receiver and processing components, significantly reducing its weight and complexity while maintaining bidirectional communication capability through the centralized laser source.
Solution Approach 2:
A single centralized laser source serves multiple network nodes simultaneously, providing illumination and communication carrier for all nodes. This multi-functional approach eliminates the need for individual laser sources at each node, reducing overall system weight while maintaining communication reliability across the network.
2Productivity
If traditional laser communication systems are used, then data transfer rate is improved, but detectability by third parties increases
Solution Approach 1:
An artificial reflector is introduced as an intermediary component at the network node. This passive reflector modulates the centralized laser beam to encode communication data without generating its own laser emission, thereby maintaining high data transfer rates while eliminating the detectable signature of distributed laser sources that third-party detection systems would otherwise identify.
Solution Approach 2:
Instead of each node actively transmitting laser beams (which creates detectable emissions), the system inverts the approach by having a centralized source transmit and using passive reflectors at nodes to modulate and return signals. This inversion maintains communication productivity while dramatically reducing detectability, as the system appears as a passive reflector rather than an active laser transmitter to third parties.
3Reliability
If active pointing control is implemented on both sides, then communication stability is improved, but device complexity and power consumption increase
Solution Approach 1:
The centralized laser source and its associated pointing control system at the base station serve all network nodes simultaneously. The system self-adjusts the laser beam direction to maintain communication with multiple nodes, eliminating the need for each node to have its own active pointing control mechanism, thereby reducing device complexity and power consumption at the network nodes while maintaining communication stability.
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
The system provides a compact, undetectable laser communication solution suitable for agile platforms, ensuring secure and efficient data transfer with low detectability, suitable for drones and other vehicles.
Implementation Method 1
a reflector device, configured to generate, by a reflection of the laser beam, a reflected laser beam
Implementation Method 2
a modulator device, configured to provide a modulation of the reflected laser beam. By means of the modulation, the reflected laser beam can be adapted to carry communication data
Data Source
AI summary
Examples include a network node for a non-detectable laser communication system, a bi-directional laser communication system comprising such a network node, a method for a non-detectable laser communication, and in particular to an optronic system for non-detectable, compact bi-directional laser communication, which is particularly suitable for communication with a drone or other unmanned vehicle (UXV).