New method of navigation underwater, which does not require a battery

Scientists at MIT have developed a new navigation system designed for underwater use. It

can be analogous to GPS, but not underwater, sohow radio waves do not pass through the layers of the ocean. Therefore, researchers now use instruments such as sonar - it emits sound waves and measures their reflection from other underwater objects and surfaces. But sonars and other methods of navigation in the water are very expensive, so MIT suggested replacing them with a new device.

The researchers drew attention to the fact thatmodern underwater navigation technologies use large, fast-discharge rechargeable batteries to power audio devices. MIT is proposing to replace it with a new type of batteryless acoustic navigation systems that work with signals already in the environment instead of creating their own.

A system has appeared that helps robots navigate even in tight spaces

The system works using piezoelectricmaterials that generate a charge under mechanical stress (for example, as a result of exposure to a sound wave). The researchers have created a system of sensors that convert sound wave information into binary code, which they use to measure the temperature of the surrounding ocean or salt content. But it can also be used to calculate location information.

For this, the technology had to be adapted,because sound bounces off surfaces underwater and bounces back at unpredictable angles. The research team was able to tune the system to collect information at different wavelengths. They tested its effectiveness at great depths, and are now working to ensure that the system can be used in shallow water.

It will enable future robotic underwater devices to better map the ocean floor, perform all types of automated monitoring and underwater navigation.

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