LEA-4A u-blox, LEA-4A Datasheet - Page 8

• Manufacturer Part Number: LEA-4A
• Description: Antaris 4 Gps Modules? Data Sheet
• Manufacturer: u-blox

1.10 LEA-4T
1.10.1 Time Mode
LEA-4T provides a special Time Mode to provide higher timing accuracy. The LEA-4T is designed for use with
stationary antenna setups. The Time Mode features three different settings described in Table 12: Disabled,
Survey-In and Fixed Mode.
Table 12: Time Mode Settings
In Fixed Mode, the accuracy of the TIMEPULSE signal is higher. Note that the TIMEPULSE signal has a
granularity is 43 ns which results from the 23.104 MHz GPS clock. Using the available quantization error
information (see UBX-TIM message) in external post-processing, a significantly higher timing accuracy can be
achieved.
1.10.2 Time Mark
LEA-4T can be used for precise time measurements with a sub microseconds resolution using the external
interrupt (EXTINT0 and EXTINT1). Rising and falling edges of these signals are time-stamped to the GPS or UTC
time and counted. The Time Mark functionality can be enabled with the UBX-CFG-TM2 message
For details, please refer to the ANTARIS
1.10.3 Raw Data Output
The LEA-4T supports raw data output at an uptake rate of 10 Hz. The UBX-RXM-RAW message includes carrier
phase with half-cycle ambiguity resolved, code phase and Doppler measurements, which can be used in external
applications that offer precision positioning, real-time kinematics (RTK) and attitude sensing.
LEA-4A, LEA-4H, LEA-4M, LEA-4P, LEA-4R, LEA-4S, LEA-4T - Data Sheet
GPS.G4-MS4-06143-1
Time Mode Settings
Disabled
Survey-In
Fixed Mode
Description
Standard PVT operation with SuperSense
The GPS receiver computes the average position over an extended time period
until a predefined maximum standard deviation has been reached. Afterwards
the receiver will be automatically set to Fixed Mode and the timing features will
be activated.
In this mode, a fixed 3D position and known standard deviation is assumed and
the timing features are activated. Fixed Mode can either be activated directly by
feeding pre-defined position coordinates (ECEF - Earth Center Earth Fixed format)
or by performing a Survey-In.
In Fixed mode, the timing errors in the TIMEPULSE signal which otherwise result
from positioning errors are eliminated. Single-satellite operation is supported, but
must be activated separately using the UBX-CFG-NAV2 message. For details,
please refer to the ANTARIS
®
4 System Integration Manual [1].
®
4 System Integration Manual [1].
®
enabled
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