passive sonar

Passive sonar is a technology used primarily in underwater environments to detect and track objects, such as submarines or marine life, without emitting sound waves. Instead, it listens for sounds made by these objects. By using hydrophones, which are underwater microphones, passive sonar analyzes noise patterns, such as engine sounds or animal calls. This method is stealthy since it doesn’t reveal the listener's position, making it crucial for military operations and marine research. Unlike active sonar, which sends out sound waves and waits for echoes, passive sonar relies solely on the sounds already present in the water.