u-blox ZED-F9P - Page 128

u-blox ZED-F9P Interface Description - Manual
Advance Information
Bitfield ref
This graphic explains the bits of ref
Name Description
source
0: none, i.e. on receipt of message (will be inaccurate!)
1: relative to pulse sent to EXTINT0
2: relative to pulse sent to EXTINT1
3-15: reserved
fall
use falling edge of EXTINT pulse (default rising) - only if source is EXTINT
last
use last EXTINT pulse (default next pulse) - only if source is EXTINT
5.12.7.4 UBX-MGA-INI-TIME_GNSS
Message
UBX-MGA-INI-TIME_GNSS
Description
Initial Time Assistance
Firmware
Supported on:
• u-blox 9 with protocol version 27
Type
Input
Comment
Supplying time assistance that is inaccurate by more than the specified time
accuracy, may lead to substantially degraded receiver performance.
This message allows the delivery of time assistance to a receiver in a chosen GNSS
timebase. This message is equivalent to the UBX-MGA-INI-TIME_UTC message, except
for the time base. See the description of AssistNow Online for details.
Header Class ID Length (Bytes) Payload Checksum
Message Structure
0xB5 0x62 0x13 0x40 24
see below
CK_A CK_B
Payload Contents:
Byte Offset Number
Format
Scaling Name Unit Description
0 U1 - type - Message type (0x11 for this type)
1 U1 - version - Message version (0x00 for this version)
2 X1 - ref - Reference to be used to set time (see graphic
below)
3 U1 - gnssId - Source of time information. Currently
supported:
0: GPS time
2: Galileo time
3: BeiDou time
6: GLONASS time: week = 834 + ((N4-1)*1461
+ Nt)/7, tow = (((N4-1)*1461 + Nt) % 7) *
86400 + tod
4 U1[2] - reserved1 - Reserved
6 U2 - week - GNSS week number
8 U4 - tow s GNSS time of week
UBX-18010854 - R04 Advance Information Page 120 of 259