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Pseudolite
GPS Anti-Jamming Systems
Rockwell Collins
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Due to their cost and operating
and design complexities, GPS/AJ receivers will not be deployed
everywhere, but only in specific applications. To protect those
systems which are not immune to jamming or interference, high
power non space-based GPS transmitters called pseudo-satellites,
or pseudolites could satisfy the demanding needs for anti-jam GPS
navigation aids. The Pseudolite transmitter is conceptually
simple, consisting of a GPS Anti-Jam reference receiver,
integrated with an Inertial Measurement Unit (IMU) for position
reporting, a GPS RF signal generator, an atomic frequency standard
and supporting equipment such as power amplifier, power supply and
datalink receiver. Rockwell Collins already demonstrated the
feasibility of Pseudolites under a DARPA program. During tests, an
airborne Pseudolite was deployed on US Army
Hunter UAVs, emplaced as
a secondary payload on the Hunter's boom pods. In addition to its
navigation support, Pseudolite can also provide ad-hoc datalink
communications, supporting smart munitions with retargeting
information, flexible fusing and other advanced features.
Pseudolites can provide significant anti-jam GPS flexibility when
deployed over a localized or wide area, without any change to
existing hardware.
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