u-blox ZED-F9P Interface Description - Manual
Advance Information
NMEA flags continued
Parameter
Description
High Precision Mode
Enabling this mode increases precision of the position output. Latitude and longitude
then have seven digits after the decimal point, and altitude has three digits after the
decimal point. Note: The High Precision Mode cannot be set in conjunction with either
Compatibility Mode or Limit82 Mode.
Extended configuration
Option
Description
GNSS to filter
Filters satellites based on their GNSS
Satellite numbering
This field configures the display of satellites that do not have an NMEA-defined value.
Note: this does not apply to satellites with an unknown ID.
Main Talker ID
By default the main Talker ID (i.e. the Talker ID used for all messages other than GSV) is
determined by the GNSS assignment of the receiver's channels (see
).
This field enables the main Talker ID to be overridden.
GSV Talker ID
By default the Talker ID for GSV messages is GNSS specific (as defined by NMEA). This
field enables the GSV Talker ID to be overridden.
BDS Talker ID
By default the Talker ID for BeiDou is 'GB'. This field enables the BeiDou Talker ID to be
overridden.
Extra fields in NMEA 4.1 and above
Message
Extra fields
systemId, signalId
navStatus
systemId, signalId
systemId
signalId
navStatus
4.1.4 Satellite Numbering
The NMEA protocol (V4.1) identifies GNSS satellites with a one digit system ID and a two digit satellite number.
u-blox receivers support this method in their NMEA output when "strict" SV numbering is selected. In most
cases this is the default setting, but can be checked or set using configuration items
In order to support QZSS within current receivers and prepare for support of other systems (e.g. Galileo) in
future receivers, an "extended" SV numbering scheme can be enabled (using configuration items
). This uses the NMEA-defined numbers where possible, but adds other number ranges to support other
GNSS. Note however that these non-standard extensions require 3 digit numbers, which may not be supported
by some NMEA parsing software. For example QZSS satellites are reported using numbers in the range 193 to
197.
See
for a complete list of satellite numbers.
GLONASS satellites can be tracked before they have been identified. In NMEA output, such
unknown satellite numbers are always reported as a null field (i.e. an empty string).
4.1.5 Latitude and Longitude Format
According to the NMEA Standard, Latitude and Longitude are output in the format Degrees, Minutes and
(Decimal) Fractions of Minutes. To convert to Degrees and Fractions of Degrees, or Degrees, Minutes, Seconds
and Fractions of seconds, the 'Minutes' and 'Fractional Minutes' parts need to be converted. In other words: If
UBX-18010854 - R04
Advance Information
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