u-blox ZED-F9P Interface Description - Manual
Advance Information
5.12.7.6 UBX-MGA-INI-FREQ
Message
UBX-MGA-INI-FREQ
Description
Initial Frequency Assistance
Firmware
Supported on:
•
u-blox 9 with protocol version 27
Type
Input
Comment
Supplying external frequency assistance that is inaccurate by more than the
specified accuracy, may lead to substantially degraded receiver performance.
This message allows the delivery of external frequency assistance to a receiver. See the
description of
for details.
Header
Class
ID
Length (Bytes)
Payload
Checksum
Message Structure
0xB5 0x62
0x13 0x40 12
see below
CK_A CK_B
Payload Contents:
Byte Offset
Number
Format
Scaling
Name
Unit
Description
0
U1
-
type
-
Message type (0x21 for this type)
1
U1
-
version
-
Message version (0x00 for this version)
2
U1
-
reserved1
-
3
X1
-
flags
-
Frequency reference (see
4
I4
1e-2
freq
Hz
Frequency
8
U4
-
freqAcc
ppb
Frequency accuracy
Bitfield flags
This graphic explains the bits of
flags
Name
Description
source
0: frequency available on EXTINT0
1: frequency available on EXTINT1
2-15: reserved
fall
use falling edge of EXTINT pulse (default rising)
UBX-18010854 - R04
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Page 122 of 259
