RT17 is used to obtain real time GPS measurements, including:
- Phase
- Pseudorange
- Carrier to noise ratios
- General tracking information, such as azimuth and elevation
RT stands for real time, and 17 refers to the record type 17 GPS
measurement information similar to that stored in Trimble DAT and
T00 files. This is the basic information used to produce GPS
positions and corrections.
Stream Control
The epoch interval is used to specify that rate at which the
measurements are sent out the port. The output rate varies
from 0.1 second to 10 minutes. The rate selected is based on
the application. High data rates are used for highly dynamic
applications, whereas low data rates are used for long-term
monitoring applications. If the receiver has mixed use,
two or more ports may be specified with different data rates,
and applications can connect to the appropriate port.
Two checkboxes are provided to control the information that
is included in the stream.
-
Positions - When checked positions will be included in the
stream at the interval specified by the Epoch Interval control.
-
Measurements - When checked GPS measurements will be included
in the stream at the interval specified by the Epoch interval
control.
Stream Options
There are various options for modifying the information included in the
RT17 stream, including:
- Use Concise Format - When checked some less frequently used information
is omitted from the measurement stream and the precision of some numbers is
reduced from an 8 byte double to a 4 byte float. Refer to the documentation
outlining these formats for the details of the differences.
- Send Raw GPS Data - When checked the raw data extracted from the GPS
satellites is included in the stream.
- Send Raw WAAS Data - When checked the raw data extracted from the WAAS
satellites is included in the stream.
- Send Ephemeris GPS Data - When checked the satellite ephemeris data is sent
each time a new ephemeris issue is decoded.
- Send IODE Values and Cycleslip Counts - Whe checked the stream includes
information to assist in determining if new ephemeris has been decoded,
together with a count of cycle slips to assist in determining if slips have
occurred when intermediate data are missing.
- Smooth Carrier Phase - When checked smoothing is applied to the carrier phase.
- Smooth Code Phase - When checked smoothing is applied to the code phase.
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