What are the two main sources of external/environmental noise?

The two main sources of external or environmental noise are classified as natural and man-made. Natural noise originates from physical phenomena in the environment, such as thunder, wind, rain, and cosmic radiation. These natural sources can interfere with electronic signals and affect the overall system performance.

On the other hand, man-made noise is generated from human activities, including industrial operations, transportation, and electronic devices. This type of noise can include electrical interference from machinery, radio communications, and urban development.

Understanding these two sources of noise is crucial in electronic warfare and signal intelligence, as they can significantly impact the clarity and quality of received signals. By distinguishing between natural and man-made noise, operators can better identify and mitigate interference, leading to improved operational effectiveness.