GSOF message: Brief All SV Info

This message contains brief satellite information for all tracked satellites in all tracked satellite systems. It contains the following data:

  • Number of satellites tracked

  • The PRN number of each satellite

  • The satellite system that the satellite belongs to

  • Flags indicating satellite status

All SV brief (Type 33 record)

Field

Item

Type

Value

Meaning

0

Output record type

Char

21h

Brief satellite information output record

1

Record length

Char

Bytes in record

2

Number of SVs

Char

Number of satellites included in record.

Includes all tracked satellites, all satellites used in the position solution, and all satellites in view.

The following bytes are repeated for the number of SVs:

 

PRN

Char

 

The PRN number of the satellite which the following flags refer to. This is the actual PRN number given by the SV (not ranged due to the SV system).

 

SV System

 

 

The system that the SV belongs to. Valid values are:

0: GPS
1: SBAS
2: GLONASS
3: Galileo
4: QZSS
5: BeiDou
6–255: Reserved

SV Flags 1

Char

SV Flags 1 indicates conditions relating to satellites:

Bit 0 Set: Above horizon
Bit 1 Set: Currently assigned to a channel (trying to track)
Bit 2 Set: Currently tracked on L1/G1 frequency
Bit 3 Set: Currently tracked on L2/G2 frequency
Bit 4 Set: Reported at base on L1/G1 frequency
Bit 5 Set: Reported at base on L2/G2 frequency
Bit 6 Set: Used in current position
Bit 7 Set: Used in the current RTK solution

SV Flags 2

Char

SV Flags 2 indicates conditions relating to satellites:

If SV SYSTEM is GPS:

Bit 0 Set: Tracking P Code on L1/G1
Bit 1 Set: Tracking P Code on L2
Bit 2 Set: Tracking CS on L2
Bit 3 Set: Tracking on L5
Bits 4–7: RESERVED

If SV SYSTEM is GLONASS:

Bit 0 Set: Tracking P Code on L1/G1
Bit 1 Set: Tracking P Code on L2
Bit 2 Set: GLONASS SV is "M" SV
Bit 3 Set: GLONASS SV is "K" SV
Bits 4–7: RESERVED

If SV SYSTEM is Galileo:

Bit 0 Set: Tracking E1
Bit 1 Set: Tracking E5A
Bit 2 Set: Tracking E5B
Bit 3 Set: Tracking E5AltBOC
Bits 4–7: RESERVED

If SV SYSTEM is QZSS:

Bit 0 Set: Tracking L1 C/A
Bit 1 Set: Tracking L1C BOC
Bit 2 Set: Tracking L1SAIF
Bit 3 Set: Tracking L2C
Bit 4 Set: Tracking L5
Bits 5–7: RESERVED

If SV SYSTEM is BeiDou:

bit 0 Set: Tracking B1
bit 1 Set: Tracking B2
bit 2 Set: Tracking B3
bits 3–7: RESERVED

else:

bits 0–7: RESERVED