Frequency use and needs of spaceborne active sensors

Spaceborne active sensors have been used for several years to study the Earth´s surface and atmosphere. The intent of this paper is to present the unique types of sensors and their characteristics that determine their individual frequency needs; to present performance and interference criteria necessary for compatibility studies with other services in the frequency bands of interest; and to present a status of current frequency spectrum use and needs and compatibility studies of spaceborne active sensors and other services, along with any issues or concerns