Defense Advanced GPS Receiver

The AN/PSN-13 Defense Advanced GPS Receiver (DAGR; colloquially, "dagger") is a handheld GPS receiver used by the United States Department of Defense and select foreign military services. It is a military-grade, dual-frequency receiver, and has the security hardware necessary to decode the encrypted P(Y)-code GPS signals.

The Defense Advanced GPS Receiver (DAGR). Coordinates are for Rockwell Collins headquarters in Cedar Rapids, Iowa.

Manufactured by Rockwell Collins, the DAGR entered production in March 2004, with the 40,000th unit delivered in September 2005. It was estimated by the news source Defense Industry Daily that, by the end of 2006, the USA and various allies around the world had issued almost $300 million worth of DAGR contracts, and ordered almost 125,000 units.[1] The DAGR replaced the Precision Lightweight GPS Receiver (PLGR), which was first fielded in 1994.

Due to the COMSEC electronics inside the DAGR, it is against US federal law (Title 18, United States Code, sections 641, 793, 798, and 952) for any individual or organization not authorized by the National Security Agency (NSA) to purchase or be in possession of the device, if knowing it to have been embezzled, stolen, purloined or converted from value of the United States or of any department or agency. When devices are no longer useful or operational, they are to be returned to an NSA-approved vendor (usually the original supplier), where they are destroyed.

Rockwell Collins also manufactures a GPS receiver known as the "Polaris Guide", that looks like a DAGR, but uses only the civilian C/A code signals. These units are labelled as "SPS", for "Standard Positioning Service", and may be possessed by non-military users.

Features
  • Graphical screen, with the ability to overlay map images.
  • 12-channel continuous satellite tracking for "all-in-view" operation.
  • Simultaneous L1/L2 dual frequency GPS signal reception.
  • Capable of Direct-Y code acquisition
  • Cold start first fix in less than 100 seconds.
  • Extended performance in a diverse jamming environment.
    • 41 dB J/S maintaining state 5 tracking.
    • 24 dB during initial C/A code acquisition.
  • Utilizes Receiver Autonomous Integrity Monitoring (RAIM).
  • Selective Availability/Anti-Spoofing Module (SAASM) compatible (currently version 3.2).
  • Wide Area GPS Enhancement (WAGE) compatible.
  • Resistant to multi-path effects.
  • Can be used as survey for weapons systems
  • Fielded to the U.S. Army, U.S. Marine Corps, U.S. Navy, U.S. Air Force and select foreign military forces
  • Designed to fit in a Battle Dress Uniform's 2-magazine ammo pouch
  • Approximate cost to government per unit to acquire: $1,832[2]

Comparison to PLGR
Parameter PLGR DAGR
Introduced 1990 2004
Frequency bands Dual (L1 & L2) Dual (L1 & L2)
Security PPS-SM SAASM
Display Text only GUI with maps
Number of channels (satellites) 5 12 (all in view)
Anti-Jam resistance 24 dB 41 dB
Time to first fix (TTFF) 360 seconds 100 seconds
Time to subsequent fix (TTSF) 60 seconds < 22 seconds
Weight 2.75 lb (1.25 kg) 0.94 lb (0.43 kg)
Dimensions (in inches) 9.5" tall, 4.1" wide, 2.6" thick 6.4" tall, 3.5" wide, 1.6" thick
(Fits in 2-magazine ammo pouch)
Battery life 13 hours (8 batteries) 14 hours (4 batteries)
Reliability 2000 hours 5000 hours
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References
  1. $82.7M more for DAGR GPS Receivers. Defense Industry Daily
  2. GPS enables DAGR to track ‘bad guys’ Archived 2007-07-08 at the Wayback Machine. Air Force Space Command News
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