Tutkasatelliitteja

Tutkasatelliitteja, also known as radar satellites, are spacecraft equipped with radar instruments to observe the Earth's surface. Unlike optical satellites that rely on sunlight, radar satellites can penetrate clouds, darkness, and even some surface materials, making them valuable for continuous monitoring regardless of weather conditions or time of day. The radar system emits microwave pulses towards the Earth and then receives the reflected signals. The characteristics of these reflected signals, such as their intensity and timing, provide information about the surface's physical properties, including topography, roughness, moisture content, and the presence of man-made structures.

These satellites play a crucial role in various applications. They are used for mapping and monitoring land use changes, deforestation, and agricultural crop health. In disaster management, they are indispensable for assessing damage after earthquakes, floods, and volcanic eruptions, providing timely information for rescue and relief efforts. Radar satellites also contribute to oceanographic studies, tracking sea ice, monitoring oil spills, and measuring ocean currents. Furthermore, they are employed in geological surveys for mineral exploration and in defense for surveillance and reconnaissance purposes. The data generated by these satellites is vital for scientific research, environmental protection, and national security.