 Earth satellite altimeters

Earth satellite altimeters are specialized instruments aboard satellites that measure the distance between the satellite and the Earth's surface. They utilize the principles of radar or laser technology to achieve these measurements. Here's a more detailed explanation: ### How Altimeters Work 1. **Signal Emission**: The altimeter emits a signal (either microwave or laser) towards the Earth's surface. 2. **Signal Reflection**: The signal travels down to the surface, where it is reflected back to the satellite.