UC-00-M15 EN R1.4
Product Introduction
4
Hot Start
-155dBm -151dBm
-150dBm
-143dBm
Reacquisition -155dBm -151dBm
-150dBm
-140dBm
1PPS (RMS)
7
20ns
Data Update Rate
1Hz
Format
NMEA 0183
，
Unicore Protocol
，
RTCM3.2
1.5
Precision Timing and Raw Data Output
UM220-IV L module supports three timing modes: fixed-location timing, optimized-
location timing and positioning timing. Switch or query the above timing modes through
CFGTM. It can also track all four GNSS systems including GPS, BDS, GLONASS and
Galileo, and switch back and forth between these four systems using CFGGNSS.
UM220-IV L module is set to optimized-location timing mode by default, and outputs
information of real-time position and site-specific position, which can be queried by
TIMPPOS. Refer to
UM220-IV L_Protocol Specification
for more details.
Fixed-location Timing
Fixed-location timing mode is applied to static scenes. In this mode, users are required
to input the exact position of receiver antenna center through CFGTM manually, which
are used by UM220-IV L module to calculate the distance between the antenna and the
satellite, and calculate time to perform timing service.
Optimized-location Timing
Optimized-location timing mode is another application used in static scenes. In this
mode, the receiver collects a set number of positioning points (within observation time)
and calculates the exact position of the antenna. After that, the exact position is locked
down, and the timing mode is switched to the fixed-location timing mode.
The observation time and accuracy are configured through CFGTM, but only when both
above-mentioned conditions are met to use fixed-location timing mode. Query the
observation status through TPFINFO.
The position estimation process is only required once after the UM220-IV L is installed.
When the position optimization is completed, the timing mode set in the receiver
automatically switches to the fixed-location timing mode.
7
Open sky
