Enhanced Position Location Reporting System


Enhanced Position Location Reporting System

The Enhanced Position Location Reporting System (EPLRS) is a secure, jam resistant, computer controlled communications network that distributes near real-time tactical information, generally integrated into radio sets, and coordinated by a Network Control Station. [http://www.raytheon.com/products/stellent/groups/public/documents/content/cms01_052749.pdf] It is primarily used for data distribution, and position location and reporting. It enhances command and control of tactical units by providing commanders with the location of friendly units. [ [http://www.gordon.army.mil/tsmtr/eplrs.htm TRADOC Systems Manager (Tactical Radios) Fort Gordon, Georgia ] ] It was first fielded by the US Army in 1987. [ [http://www.fas.org/man/dod-101/sys/land/eplrs.htm Enhanced Position Location Reporting System (Eplrs) ] ]

EPLRS is a Time Division Multiple Access System that uses a frequency hopping, spread spectrum waveform in the UHF band. [ [http://www.fas.org/man/dod-101/sys/ac/equip/docs/A2C2S_Tutorial_RevA1a/tsld019.htm EPLRS ] ] It incorporates the Thorton family of COMSEC devices, and has the capability for Over the Air Rekeying (OTAR). EPLRS uses the Army Data Distribution System version of the X.25 CCITT and MIL-STD-1553B protocols to interface with Army Tactical Command and Control System (ATCCS).

Network Control Station

Each network is controlled by a Network Control Station (NCS), AN/TSQ-158. These have gone through several iterations.

First Gen

*1 AN/UYK-7 computer
*3 AN/UYK-20 computers

econd Gen

*1 AN/UYK-7 computer
*3 AN/UYK-44(V) computers

Third Gen

Downsized version to fit in HMMWV, first fielded in 1991. Dimensions: 8.5'x7'x6', 4000lbs
*1 AN/UYK-44(V) Enhanced Processor (EP) computer

Fourth Gen

The AN/TSQ-158(V)4 is produced by Raytheon. Housed in a HMMWV replacing the AN/UYK-44 computer with a toughbook laptop computer. Data is displayed through the FBCB2 platform.

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