passive radar

Passive radar is a detection system that locates objects, like aircraft or ships, without emitting its own signals. Instead, it listens for signals from existing sources such as commercial broadcasts or radio transmitters. When these signals bounce off objects, the passive radar detects the reflected signals and analyzes their timing and changes to determine the object's position and movement. This approach allows for covert, low-cost tracking since it doesn't generate its own signals and can operate without alerting the target. It's commonly used in surveillance, navigation, and military applications.