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.
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.
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.
| 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 |