(3) Army Data Distribution System (ADDS). The significant increase in automation
supported weapons systems presently being fielded necessitates the development of an efficient and
effective means to transfer data on the battlefield. The ADDS will address this issue. The ADDS is an
integrated C2 communications system designed to provide near real-time transmission capabilities to
support high volume data networks. It provides precise position, location, navigation, identification,
time of day and reporting information for units in forward battlefield areas. The ADDS has its own
built-in cryptographic features and is highly resistant to enemy jamming. It will provide a means to
transfer data for fire support, air defense, and intelligence and electronic warfare systems. The ADDS
consists of two subsystems-Enhanced Position Location Reporting System (EPLRS) and Joint Tactical
Information Distribution System (JTIDS). EPLRS and JTIDS radios provide an alternate means of data
communications to combat net radio.
(a) EPLRS (Figure 2-13) is a computer-based communications system designed to
provide secure, jam-resistant, near real-time data transmission and distribution to subscribers. Heavy
voice traffic to determine unit location is removed from combat net radio nets, thus allowing these
systems to be used more effectively for C2. EPLRS provides automatic position location data with art
accuracy to within 10 to 15 meters (8-digit grid coordinates). EPLRS has a high speed data transfer
capability that will support battlefield automated systems. EPLRS:
Provides units with their own position, range, and bearing in relation to other
Can give an automated warning to alert maneuver units when they are about to
enter predesignated no-entry areas such as contaminated zones or mine fields.
Provides identification of friendly units.
Can be configured in ground vehicles and aircraft, using mounting kits, or
manpacked for small unit use.
Uses pseudo noise wide spectrum frequency hopping to ensure the transmissions
a jam-resistant, will have a low probability of enemy interception, and are secure
Will automatically provide location information to the Maneuver Control System
(MCS) to enhance the commander's ability to command and control, both ground
and air units.