u-blox ZED-F9P Interface Description - Manual
Advance Information
MGA-BDS continued
Byte Offset Number
Format
Scaling Name Unit Description
64 I4 2^-31 Cus semi-
circles
Amplitude of sine harmonic correction term to
the argument of latitude
68 I4 2^-6 Crc m Amplitude of cosine harmonic correction term
to the orbit radius
72 I4 2^-6 Crs m Amplitude of sine harmonic correction term to
the orbit radius
76 I4 2^-31 Cic semi-
circles
Amplitude of cosine harmonic correction term
to the angle of inclination
80 I4 2^-31 Cis semi-
circles
Amplitude of sine harmonic correction term to
the angle of inclination
84 U1[4] - reserved2 - Reserved
5.12.2.2 UBX-MGA-BDS-ALM
Message
UBX-MGA-BDS-ALM
Description
BDS Almanac Assistance
Firmware
Supported on:
• u-blox 9 with protocol version 27
Type
Input
Comment
This message allows the delivery of BeiDou almanac assistance to a receiver. See the
description of AssistNow Online for details.
Header Class ID Length (Bytes) Payload Checksum
Message Structure
0xB5 0x62 0x13 0x03 40
see below
CK_A CK_B
Payload Contents:
Byte Offset Number
Format
Scaling Name Unit Description
0 U1 - type - Message type (0x02 for this version)
1 U1 - version - Message version (0x00 for this version)
2 U1 - svId - BeiDou satellite identifier (see Satellite
Numbering)
3 U1 - reserved1 - Reserved
4 U1 - Wna week Almanac Week Number
5 U1 2^12 toa s Almanac reference time
6 I2 2^-19 deltaI semi-
circles
Almanac correction of orbit reference inclination
at reference time
8 U4 2^-11 sqrtA m^0.5 Almanac square root of semi-major axis
12 U4 2^-21 e - Almanac eccentricity
16 I4 2^-23 omega semi-
circles
Almanac argument of perigee
20 I4 2^-23 M0 semi-
circles
Almanac mean anomaly at reference time
24 I4 2^-23 Omega0 semi-
circles
Almanac longitude of ascending node of orbit
plane at computed according to reference time
UBX-18010854 - R04 Advance Information Page 103 of 259
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