GSOF message: Navigation Message Authentication (NMA) Info

Applicable receivers:  All receivers

This message describes the satellites that have passed and failed the Navigation Message Authentication. It contains the following data:

  • Satellites that have passed the Navigation Message Authentication check

  • Satellites that have failed the Navigation Message Authentication check

Navigation Message Authentication (Type 97 record)

Field

Item

Type

Value

Meaning

0

Output record type

Char

5B

Satellite Navigation Message Authentication status

1

Record length

Char

 

Bytes in record

2 to 3

GPS week number

Short

 

GPS week number

4 to 7

GPS time

Long

 

GPS time, in milliseconds

8

Number of NMA in this message

Char

 

The number of NMA tested and reported in this message

The following fields are repeated for each NMA:

 

NMA source

Char

 

NMA source:

0: OSNMA
1: RTX-NMA
2: QZNMA
 

NMA Signal type

Char

 

NMA Signal type:

0: GPS LNAV (L1 C/A)
1: GPS CNAV (L2)
2: GPS CNAV (L5)
3: GPS CNAV2 (L1C)
4: Galileo I/NAV (E1)
5: Galileo F/NAV (E1)
6: BeiDou LNAV (B1I)
7: QZSS LNAV (L1 C/A)
8: QZSS LNAV (L1 C/B)
9: QZSS CNAV (L5)
10: QZSS CNAV2 (L1C)
 

NMA mask size

Char

 

NMA mask size (N bytes)
 

Authenticated bit mask

N*Char

 

Authenticated bit mask:

bit 0 (lsb): PRN 1
 

Failed bit mask

N*Char

 

Failed bit mask:

bit 0 (lsb): PRN 1