What distinguishes passive sensors from active sensors?
Understand the Problem
The question is asking for the differences between passive and active sensors, particularly in the context of their functionality and signal interactions.
Answer
Active sensors emit energy to detect signals, while passive sensors detect natural energy without emitting signals.
Active sensors require an internal power source and emit energy to detect and measure signals, while passive sensors detect natural signals or energy without emitting anything themselves.
Answer for screen readers
Active sensors require an internal power source and emit energy to detect and measure signals, while passive sensors detect natural signals or energy without emitting anything themselves.
More Information
Active sensors, such as radar, emit energy (e.g., electromagnetic waves) and measure the reflection to detect objects. In contrast, passive sensors, like cameras, detect light naturally emitted or reflected from objects.
Tips
A common mistake is assuming passive sensors need a power source to operate; however, it's typically active sensors that require power.
Sources
- Passive Sensors vs Active Sensors: Satellite Detection Demystified - asterra.io
- Passive vs Active Sensors in Remote Sensing - GIS Geography - gisgeography.com
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