These systems rely on what is known as the ring laser gyro
, equipment once only found on aircraft navigation and missile control systems but now adapted for land use.
The Navy describes the EGI system as "a small, reliable, light weight unit which contains full Precise Position Service GPS on a single standard electronic module, plus a state-of-the-art Ring Laser Gyro
inertial navigation system.
Navy AN/WSN-7/7A Ring Laser Gyro
Navigation (RLGN) Systems, AN/WSN-7B Ring Laser Gyrocompasses (RLGN), Integrated Bridge System (ibs)/voice Management Systems, And Navigation And Search Radar Systems
EGI is described as a small, lightweight piece of electronics that uses a "state-of-the-art Ring Laser Gyro
inertial navigation system" plus GPS signals.
A ring laser gyro
strapdown inertial navigation system, the AN/ASN-139 provides better than 1 nautical mile per hour navigation performance, said Northrop.
Based on TAMAM's excellent Ring Laser Gyro
(RLG), the TMAPS is the most cost-effective advanced inertial navigation system available, and can operate in GPS-disturbed or jammed battlefield scenarios.