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First built in 1995 as a modification of AN/TPQ-36A for search and track role in the Norwegian NASAMS air defense system, the Sentinel radar is deployed with forward area air defense units of the U.S. Army. Mounted on a towed platform, it can be positioned remotely from the rest of the unit.
A Selective Availability Anti-spoofing Module (SAASM) is used by military Global Positioning System receivers to allow decryption of precision GPS observations, while the accuracy of civilian GPS receivers may be reduced by the United States military through Selective Availability (SA) and anti-spoofing (AS). [1]
The M-code is transmitted in the same L1 and L2 frequencies already in use by the previous military code, the P(Y)-code. The new signal is shaped to place most of its energy at the edges (away from the existing P(Y) and C/A carriers). It does not work at every satellite, and M-code was switched off for SVN62/PRN25 on 5 April 2011. [29]
In a major departure from previous GPS designs, the M-code is intended to be broadcast from a high-gain directional antenna, in addition to a wide angle (full Earth) antenna. The directional antenna's signal, termed a spot beam , is intended to be aimed at a specific region (i.e., several hundred kilometers in diameter) and increase the local ...
Sentinel Offender Services is a criminal justice services and original equipment manufacturing company based in Anaheim, California. The company was founded in 1993 by Robert Contestabile, who is currently the chairman.
A GPS tracking unit, geotracking unit, satellite tracking unit, or simply tracker is a navigation device normally on a vehicle, asset, person or animal that uses satellite navigation to determine its movement and determine its WGS84 UTM geographic position (geotracking) to determine its location. [1]
The MIM-104 Patriot is a mobile interceptor missile surface-to-air missile (SAM) system, the primary such system used by the United States Army and several allied states. It is manufactured by the U.S. defense contractor Raytheon and derives its name from the radar component of the weapon system.
The E-3 Sentry's airframe is a modified Boeing 707-320B Advanced model. Modifications include a rotating radar dome ( rotodome ), uprated hydraulics from 241 to 345 bar (3500–5000 psi) to drive the rotodome, [ 21 ] single-point ground refueling, air refueling, and a bail-out tunnel or chute.
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