Active System (active Sensor)
Active system, also known as active sensor, is a type of sensor that emits its own energy or signal to detect and measure properties of the surrounding environment. This type of system is commonly used in space and astronautical engineering for remote sensing applications, such as radar and lidar. Active sensors provide their own source of illumination, which allows them to operate independently of external light sources and to penetrate through various materials, such as clouds, smoke, and foliage. They can also provide high-resolution images and precise measurements of distance, velocity, and other parameters. However, active systems require more power and can be more complex than passive systems, which rely on external sources of energy, such as sunlight or thermal radiation.
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