u-blox ZED-F9P User Manual

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 AssistNow Online 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 - Reserved
3 X1 - flags - Frequency reference (see graphic below)
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 Advance Information Page 122 of 259

u-blox ZED-F9P Specifications

General

GNSS	GPS, GLONASS, Galileo, BeiDou, QZSS, SBAS
Concurrent GNSS	4
RTK	Yes
Velocity Accuracy	0.05 m/s
Time Pulse Accuracy	30 ns
Operating Temperature	-40°C to +85°C
Supply Voltage	2.7 V to 3.6 V
Channels	184
Frequency Bands	L1, L2
Dimensions	22 mm x 17 mm x 2.4 mm
Interfaces	UART, SPI, I2C