There are two types of microwave sensors, passive and active. Table 4.1.1 shows the typical microwave sensors and targets to be measured. Table 4.1.2 shows the frequency of passive microwave sensor for monitoring major targets. Table 4.1.3 shows the frequency of active microwave sensor for monitoring major targets.
Many of the earth observation satellites to be launched after 1992 are planned to have microwave sensors onboard. Active sensors will be classified into more types in terms of the target with respect to horizontal or vertical polarization.
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