MARC21-007: Sensor type of remote sensor
active
Sensor measures the strength of reflections of its transmissions sent to a remote target.
a
other
Sensor type other than active, passive.
z
passive
Sensor measures the strength of transmissions (e.g., radiation) emitted by a remote target without stimulation by the sensor.
b
unknown
Involvement of remote-sensing device in the creation of the transmission it measured is not known.
u
Published