Efforts at the U.S. Army Research, Development and Engineering Center (ARDEC) at Picatinny, New Jersey are
focused on developing methods to counter GPS jamming and electronic warfare (EW) threat by eliminating GPS
dependency entirely. In addition, the need for munitions cost reduction requires alternatives to expensive high-grade
inertia components. Efforts at ARDEC include investigations of novel methods for onboard measurement of munitions
full position and angular orientation independent of GPS signals or high-grade inertia components. Currently, two types
of direct angular measurement sensors are being investigated. A first sensor, Radio Frequency Polarized Sensor (RFPS),
uses an electromagnetic field as a reference. A second sensor is based on magnetometers, using the Earth magnetic field
for orientation measurement. Magnetometers, however, can only provide two independent orientation measurements.
The RFPS may also be used to make full object position and angular orientation measurement relative to a reference
coordinate system, which may be moving or stationary. The potential applications of novel RFPS sensors is in
providing highly effective inexpensive replacement for GPS, which could be used in a "Layered Navigation" scheme
employing alternate referencing methods and reduce the current dependency on GPS as a primary reference for guided
gun-fired munitions. Other potential applications of RFPSs is in UAVs, UGVs, and robotic platforms.