Towed Sensor Assembly for Low-SWAP UAV Backup Communications
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Solution Overview
Problem
UAVs face interference from their own motor noise, making it difficult to receive audio and magnetic signals, and existing backup communication systems are power and weight intensive.
Innovation Solution
A towed sensor assembly connected to the UAV at a distance to minimize interference from motor noise, using magnetic or audio sensors that weigh within SWAP constraints and communicate via wired or wireless connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensor is positioned close to the UAV for compact deployment, then the device complexity is reduced, but the sensor receives interference from motor noise
Solution Approach 1:
The patent transitions from horizontal integration (mounting sensor on the UAV body) to vertical separation (towing sensor behind the UAV at a distance). This dimensional change in spatial arrangement allows the sensor to be positioned in a location with reduced motor noise interference while maintaining system compactness through the towing mechanism.
Solution Approach 2:
The towing mechanism acts as an intermediary between the UAV and the sensor, enabling the sensor to be positioned at an optimal distance from the motor noise source. This intermediary structure allows the sensor to operate in a quieter acoustic environment while still being part of the UAV system.
2Reliability
If existing backup communication systems are used, then communication reliability is improved, but power consumption and weight increase
Solution Approach 1:
The UAV's motor noise, which is typically a harmful byproduct, is repurposed as the communication signal carrier. The motor's acoustic emissions naturally encode position and velocity information, eliminating the need for separate communication transmitters and reducing overall power consumption while maintaining communication reliability.
Solution Approach 2:
The patent converts the harmful motor noise into a useful communication resource. By treating the motor's acoustic emissions as the communication channel, the system transforms a detrimental factor into a beneficial one, reducing the need for additional power-intensive communication equipment.
3Speed
If RF communication is used in contested environments, then communication speed is maintained, but the system becomes vulnerable to jamming
Solution Approach 1:
The patent replaces electromagnetic (RF) communication with acoustic communication through motor noise analysis. This substitution moves the communication domain from the electromagnetic spectrum to the acoustic domain, making the system immune to RF jamming while maintaining the ability to extract position and velocity information in real-time.
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
Enhances signal reception up to 100 m away while adhering to UAV size, weight, and power limits, providing a secondary communication system that is resilient to RF jamming.
Implementation Method 1
a sensor that acts as a receiver for the UAV. The sensor receives a signal from a transmission source other than the UAV... wherein the received signal from the transmission source is magnetic or audio
Data Source
AI summary
A secondary communication system for an unmanned aerial vehicle (UAV) is provided. The secondary communication system comprises at least one motor on the UAV and a motor controller in each motor that generates a signal from noise generated by the motor. A connector is configured to connect a towed sensor assembly to the UAV. A sensor acts as a receiver for the UAV, wherein the sensor receives a signal from a transmission source other than the UAV. The sensor is towed on the connector at a distance from the UAV sufficient to prevent or minimize interference of the received signal by the noise generated by the motor.