Design and implementation of underwater acoustic wake-up system based on time-frequency detection

Typically, unattended underwater devices are deployed for extended periods. As underwater energy supplies are limited, it is crucial to reduce energy consumption to prolong operational time. To address incorrect wake-ups caused by double-selective and noisy underwater channels, an underwater acoustic wake-up system devices based on time-frequency detection is designed using the GD32F4xx. The system can collect and process signals in real-time, achieving independent wake-ups for different devices through distinct address codes. Sea trial results with a 1 km range and an average signal-to-noise ratio of 30 dB show that the average wake-up success rate of this system is 95.2%, with an incorrect wake-up rate of 0. Additionally, a 60% wake-up success rate is achieved even at a −6 dB signal-to-noise ratio.