BECS-II: an updated bio-inspired electrocommunication system for small underwater robots

Area of Science:

• Biomimicry
• Underwater Communication Systems
• Electrical Engineering

Background:

• Traditional underwater communication methods are limited in dark, complex environments.
• Previous work introduced a bio-inspired electrocommunication system (BECS) with 1200 bps speed over 3 m.
• Weakly electric fish utilize electrocommunication effectively in challenging aquatic conditions.

Purpose of the Study:

• To develop an improved underwater wireless communication system (BECS-II) based on bio-inspired electrocommunication.
• To enhance communication speed, range, and anti-interference capabilities for underwater applications.
• To explore dual-frequency communication inspired by electric fish for adaptable task performance.

Main Methods:

• Development of theoretical and simulation models for electrocommunication, incorporating angular frequency and electrode impedance.
• Implementation of a custom-made digital communication system for improved anti-interference and channel capacity.
• Application of a novel circuit optimization strategy for enhanced transmitting and receiving capabilities.
• Introduction of dual-frequency communication for varied underwater tasks.

Main Results:

• BECS-II achieved a communication speed of approximately 20 kbps over 10 m in high-frequency mode, a significant improvement over BECS.
• In low-frequency mode, BECS-II extended communication range to approximately 20 m at 200 bps.
• The enhanced system demonstrated superior performance in both speed and distance compared to the original BECS.

Conclusions:

• BECS-II offers a substantial upgrade in underwater wireless communication performance.
• The dual-frequency capability provides flexibility for different underwater tasks and robot group coordination.
• Increased communication range enhances robot motion space and group flexibility in underwater environments.