For optimum performance, ground sensor systems need to be coupled with rapid-reaction patrols which are able to move to alarm sites quickly. The use of ground sensor systems thus, does not necessarily entail the reduction of peacekeeping personnel. Because the physical presence of international peacekeepers carries more weight than does technical equipment, sufficient personnel should be available in the monitored areas to be able to dispatch teams to several alarm sites simultaneously, and reinforcements if necessary. Sensor systems should not be seen as a personnel replacement, but as a highly important force multiplier which allows peacekeeping forces to fulfill their tasks more thoroughly. System Concepts Ground sensors can detect movement on land, in the air, and in water.
Many technologies exist which can be used for sensing objects and movement outdoors.
Several military ground sensor systems which can be used for peace operations already exist on the market. These are robust, can be quickly deployed, transmit their data by radio, and are suitable for covert deployment. Sensor signals or alarms are usually communicated by radio. If distances of more than a few kilometres have to be covered, relay stations need to be used. Sensors and repeating transmitters are usually powered by batteries.