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 The principal UGS system used by the US military is
the AN/GSR-8 REmotely Monitored Battlefield Sensor System (REMBASS
II), which detects, classifies and determines the direction of
movement of intruding personnel and vehicles. The system uses
three basic sensor transducers, including a basic seismic/acoustic
multi-sensor, which can be fitted with passive infrared (PIR) or
magnetic plug-in modules. Each unit has a different coverage – the
seismic/acoustic detects personnel at a range of 75 meters, the
PIR provides directional cues of the target's direction of
movement, with coverage of 30 meters. The magnetic sensor provides
a localized indication, detection targets containing ferrous
metals at a distance of only 3 meters.
The system uses an open interface which can integrate
new types of sensors, including CBRN, meteorological, RF sensors
etc. The sensors communicate the target data messages up to 15
kilometers using Low Probability of Intercept/Low Probability of
detection (LPI/LPD) VHF communications. Optional repeaters can
extend the REMBASS II range up to 150 km. Such sensors are not
limited to manual hand emplacement.
 REMBASS II based Air Deliverable Remote Sensor System
(ADRSS) is currently in development at L3 Communications. When
matured, sensors could be deployed by rotary UAVs, Tactical UAVs,
or even high speed aircraft. REMBASS II sensors are monitored by
an Advanced Monitoring Display System (AMDS) which enables
operators to plan missions and depict sensor locations and
activities on a graphical display. Sensor data collection can also
be performed by a UAV, which also provides users to send data
queries to the sensors, over very long distances. The system is
also used to control the AN/PPS-5D Ground Surveillance Radar. The
system is currently fielded by Stryker Brigade Combat Teams and
Special Forces. A subset of the system is the Platoon Early
Warning Device (PWED II) system, which uses the basic
seismic/acoustic sensor, offering unattended physical security for
defensive positions set up by the infantry platoon.
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