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Abstract: One component of the Department of Transportation’s GPS Adjacent Band
Compatibility Study is the characterization of GPS/GNSS receiver antennas
Such characterization is needed to:
Compare radiated and conducted (wired) test results
Apply interference tolerance masks (ITMs) to use cases where adjacent band transmitters are seen
by GPS/GNSS receiver antennas at any direction besides zenith (antenna boresight)
This presentation summarizes characterization data obtained thus far:
Gain patterns for 14 external antennas
o Right‐hand/left‐hand circular polarization (RHCP/LHCP), vertical (V), and horizontal (H)
polarizations
o 22 frequencies: 1475, 1490, 1495, 1505, 1520, 1530, 1535, 1540, 1545, 1550, 1555, 1575,
1595, 1615, 1620, 1625, 1630, 1635, 1640, 1645, 1660, and 1675 MHz
Approximate L1 RHCP relative gain patterns for 4 antennas integrated with receivers
Saturation measurements for the 14 external (all active) antennas
All antennas provided by the USG
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