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GPS
Anti-Jam Receiver (AJR)
Raytheon
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The Anti-jam GPS Receiver (AGR)
designed by Raytheon supports the Tactical Tomahawk missile
program. The system uses PPS (Y-code) GPS signals, operating on
both the L1 and L2 frequencies. When configured with a
multi-element Controlled Reception Pattern Antenna (CRPA), the
AGR’s post-correlation nulling techniques allow continued
satellite track in the presence of high levels of hostile jamming.
This patented anti-jam concept also provides satellite beam
steering, to further enhance the tracking thresholds, and to
mitigate the “spurious nulls” that can degrade the performance of
other nulling implementations (e.g., pre-correlation). The AGR
sequentially tracks up to eight visible satellites, and provides
high-quality pseudorange/delta pseudorange (PR/DPR) measurements
corrected for the effects of selective availability. The Tactical
Tomahawk’s navigation processor then uses the PR/DR measurements
to yield a high-performance navigation solution.
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