KVH TACNAV is a tactical navigation system which augments GPS navigation
systems with complimentary position references used on combat vehicles,
such as odometer, electronic compass, fiber-optic gyro etc. The system
enables continued navigation, position keeping, dead reckoning
navigation, and targeting even when GPS is jammed, or unavailable.
TACNAV is provided as commercial off the shelf (COTS) system, providing
simple compass display showing bearing, north position and distance
traveled from last reference point. The system interfaces with on board
navigation systems (such as GPS, odometer) and BMS to complement the GPS
when GPS. This function has become essential with the fielding of Blue
Force Tracking systems, as location reporting from all units are
critical for establishing a broad situational picture at all levels.
Most systems rely exclusively on GPS data, which is vulnerable to
interference and jamming. The addition of backup positioning reference
enables the Blue-Force Tracking position location unit to continue and
transmit the vehicle's position even when GPS is not available. With an
Enhanced Fiber-Optic Gyro (FOG) module, and turret angle encoder, TACNAV
becomes a Target Location System (TLS) for turreted platforms. Enabling
the system to monitor and process the turret position, thus feeding
essential information to on-board threat warning and countermesures
system, BMS etc. The FOG improves the pointing accuracy of the system
from 35mil to 10 mils, providing redundant GPS backup options. It also
improves dead reckoning accuracy by reducing error rate from 3% to 1% of
the distance traveled. Using TLS target location accuracy is quadrupled
from 300 (meters at 5 km range) to 75 meters.
The latest addition to the system is the TACNAV Enhanced Navigation and
Visualization System. This interface provides a large touch-screen
controlled display showing navigation and positioning data,
steer-to-navigation guidance, heading, distance and waypoint data over a
map of aerial photo. The reference image can be a high resolution
topographical map or variable scale aerial photo. The system also shows
the traveled path (DR) and various objects of interest (such as red and
blue forces, IED threats etc.) on a geo-referenced overlay.