RCB-F9T - Integration manual
3.1.5.3 List of supported RTCM output messages
Message type
Description
RTCM 1005
Stationary RTK reference station ARP
RTCM 1077
GPS MSM7
RTCM 1087
GLONASS MSM7
RTCM 1097
Galileo MSM7
RTCM 1127
BeiDou MSM7
RTCM 1230
GLONASS code-phase biases
RTCM 4072.1
Additional reference station information (u-blox proprietary RTCM Message)
Table 4: RCB-F9T supported output RTCM version 3.3 messages
3.1.5.4 Timing receiver position
Time mode is a special receiver mode where the position of the receiver is known and fixed and only
the time and frequency is calculated using all available satellites. This mode allows for maximum
time accuracy, for single-SV solutions, and also for using the receiver as a stationary reference
station.
In order to use time mode, the receiver's position must be known as exactly as possible. Errors in the
fixed position will translate into time errors depending on the satellite constellation.
The following procedures can be used to initialize the timing receiver position:
• Using built-in survey-in procedure to estimate the position.
• Entering coordinates independently generated or taken from an accurate position such as a
survey marker.
3.1.5.4.1 Survey-in
Survey-in is a procedure that is carried out prior to entering Time mode. It estimates the receiver
position by building a weighted mean of all valid 3D position solutions.
Two major parameters are required when configuring:
• A
minimum observation
time defines the minimum observation time independent of the
actual number of fixes used for the position estimate. Values can range from one day for high
accuracy requirements to a few minutes for coarse position determination.
• A
3D position standard deviation
defines a limit on the spread of positions that contribute to
the calculated mean.
Survey-in ends when both requirements are successfully met. The Survey-in status can be queried
using the UBX-TIM-SVIN message.
To configure a timing receiver into Survey-in mode (CFG-TMODE-MODE=SURVEY_IN), the following
items are required:
Configuration item
Description
CFG-TMODE-MODE
Receiver mode (disabled, survey-in or fixed)
CFG-TMODE-SVIN_MIN_DUR
Survey-in minimum duration
CFG-TMODE-SVIN_ACC_LIMIT
Survey-in position accuracy limit. The accuracy of given coordinates in 0.0001
meters (i.e. value 100 equals 1 cm)
Table 5: Configuration items used for setting a timing receiver into Survey-in mode
Set the configuration items shown above into flash memory to perform a survey-in
procedure automatically upon start-up.
UBX-22004121 - R01
3 Receiver functionality
Page 10 of 64
C1-Public
Early production information
