UAV Passive Reflective Device for Radio Signal Relay
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Solution Overview
Problem
Existing aerial relay systems for ground-to-ground radio communication, such as UAVs with electronic repeaters, are heavy, power-hungry, and expensive, making them unsuitable for everyday use at lower military echelons and civilian applications like police, fire, or border patrol, and they fail to effectively relay signals through obstacles like mountains or buildings.
Innovation Solution
An unmanned aerial vehicle (UAV) equipped with a passive reflective device having an elongated configuration, oriented to maintain its long axis substantially tangential to an ellipsoid with foci at the points of communication, acts as a low-cost relay by reflecting radio signals, optimizing bistatic signal strength and reducing weight, power consumption, and electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic repeaters are used as UAV payloads, then signal relay capability is improved, but weight, power consumption, and cost increase significantly
Solution Approach 1:
The patent replaces the electronic repeater system (active electronic components requiring power) with a passive reflective device that uses electromagnetic reflection principles. The reflective device consists of conductive elements mounted on the UAV that passively reflect radio signals without requiring power consumption, electronic processing, or complex circuitry, thereby eliminating the weight and power constraints of traditional repeater systems.
Solution Approach 2:
The patent extracts the core functional requirement (signal relay) from the complex electronic repeater system and implements it through a simplified passive reflective mechanism. By taking out only the essential reflection function and eliminating unnecessary electronic components, power supplies, and control systems, the solution achieves signal relay capability with minimal weight and zero power consumption.
2Reliability
If electronic repeaters are used as UAV payloads, then signal relay capability is improved, but power consumption increases
Solution Approach 1:
The patent replaces the electronic repeater system (active electronic components requiring power) with a passive reflective device that uses electromagnetic reflection principles. The reflective device consists of conductive elements mounted on the UAV that passively reflect radio signals without requiring power consumption, electronic processing, or complex circuitry, thereby eliminating the weight and power constraints of traditional repeater systems.
Solution Approach 2:
The passive reflective device is self-service in nature, utilizing the incident radio signal itself to generate the reflected signal. No external power source is needed - the device automatically reflects signals based on the electromagnetic properties of its conductive elements and their geometric arrangement, making the system completely power-independent for the signal relay function.
3Reliability
If electronic repeaters are used as UAV payloads, then signal relay capability is improved, but cost increases
Solution Approach 1:
The patent extracts the core functional requirement (signal relay) from the complex electronic repeater system and implements it through a simplified passive reflective mechanism. By taking out only the essential reflection function and eliminating unnecessary electronic components, power supplies, and control systems, the solution achieves signal relay capability with minimal weight and zero power consumption.
Solution Approach 2:
The passive reflective device uses simple, inexpensive conductive materials (such as metal strips, wires, or meshes) that can be easily manufactured and deployed. These materials are far cheaper than electronic repeater components, and the device can be rapidly produced and replaced if needed, making the overall system cost-effective for widespread deployment in military and civilian applications.
4Reliability
If traditional repeater systems are used, then signal relay is achieved, but electromagnetic interference increases
Solution Approach 1:
The patent replaces the electronic repeater system (active electronic components requiring power) with a passive reflective device that uses electromagnetic reflection principles. The reflective device consists of conductive elements mounted on the UAV that passively reflect radio signals without requiring power consumption, electronic processing, or complex circuitry, thereby eliminating the weight and power constraints of traditional repeater systems.
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 solution enables reliable and cost-effective radio-frequency communication between ground terminals by minimizing the equivalent range and avoiding signal blockages, allowing UAVs to be used at lower military levels and in civilian applications without the drawbacks of traditional repeaters.
Implementation Method 1
at least one passive reflective device having an elongated configuration defining a long axis and comprising a material configured to reflect radio signals
Data Source
AI summary
An unmanned aerial vehicle (UAV) includes at least one passive reflective device having an elongated configuration defining a long axis and comprising a material configured to reflect radio signals. The UAV also includes a control system configured to control the UAV along a flight path that orients the at least one passive reflective device such that the long axis remains substantially tangential to an ellipsoid whose foci are at two points between which radio communication is desired.