Satellites - Tracking Information
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This table shows information about the satellites that are being
tracked. Each row in the table shows one of 12 Channels in the
NetRS, each of which can track the signals from a single satellite.
When a channel is tracking a satellite, the table will show specific
information about that satellite, as well as some basic measurement
values. This information is updated approximately every five seconds.
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PRN:
The numeric identifier of the satellite tracked on the channel.
To sort by the satellite PRN number click on PRN at the top
of the column.
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Elv:
The elevation of the satellite, in degrees above the horizon.
To sort by elevation click on Elv at the top of the column.
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Azm:
The azimuth (direction) of the satellite, in degrees clockwise from True
North.
To sort by azimuth click on Azm at the top of the column.
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L1 SNR:
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L2 SNR:
The Signal to Noise Ratio (SNR) of the satellite on either the
L1 or L2 frequency. Scaled to a 1 Hertz bandwidth (C/N0 - "C
to N-zero".) L2C SNR values will appear in the L2 SNR column,
with a C prefix on the value, as in C38.4. If both
L2-Ycode and L2C are being tracked, then both SNR values will be shown,
as with 32.4 / C39.6.
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IODE:
Issue of Data Ephemeris - The numeric identifier for the latest
satellite data collected from this satellite.
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URA:
User Range Accuracy - The GPS Control Segment's estimate of the
accuracy of the satellite's ranging signals, in meters.
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Health:
Health status as provided in the most recent almanac data. When
Healthy is displayed in this column it indicates that a value of
zero (indicating perfect health) was received. A non-zero value
indicates that the satellite has been marked as unhealthy. See the GPS
Interface Control Document (ICD-GPS-200) for information about unhealthy
satellite codes.
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Chan:
Channel number. Each channel is capable of tracking the L1
and L2 signsls from a single satellite.
To sort by the channel number click on Chan at the top of
the column.
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