There are a few technologies that are similar to radar in the sense that they use waves to detect and locate objects. Here are a few examples:

1. Lidar (Light Detection and Ranging): Lidar uses lasers to measure the distance to an object and create a 3D map of the surrounding environment. It is commonly used in autonomous vehicles, robotics, and mapping applications.

2. Sonar (Sound Navigation and Ranging): Sonar uses sound waves to detect and locate objects in water. It is commonly used in marine navigation, fishing, and underwater mapping.

3. Infrared (IR) Imaging: Infrared imaging uses thermal radiation to create images of objects based on their temperature. It is commonly used in military applications, as well as in building inspections, and industrial and medical imaging.

4. Ultrasonic Sensors: Ultrasonic sensors emit high-frequency sound waves and measure the time it takes for the waves to bounce back to detect objects. They are commonly used in manufacturing and automation, as well as in parking sensors, and medical imaging.

While these technologies are similar in some ways to radar, each has its own strengths and weaknesses, and they are used in different applications depending on the specific needs and requirements of the situation.
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