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TeachMeFinance.com - explain active system (active sensor) active system (active sensor) The term 'active system (active sensor)' as it applies to the area of Earth observation can be defined as ' A remote-sensing system that transmits its own radiation to detect an object or area for observation and receives the reflected or transmitted radiation. Radar is an example of an active system. Compare with passive system'. Previous 5 Terms: Active Prominence Region (APR) Active Region (AR) Active solar Active Storage Capacity Active Surge Region (ASR) Next 5 Terms: Active transport Active volcano Activities Of Daily Living (Adl)- Activity ACTPN About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.