ION/UTC report
The ION/UTC report is sent when Command Packet 54h is used to request the UTC (Universal Time Coordinated) and Ionospheric data. The Command Packet 54h SUBTYPE byte (byte 4) is set to three (3) when requesting the report.
Data follows the standard defined within GPS ICD-200 except that some parameters are expanded. A NAK is returned if Command Packet 54h DATA SWITCH values is out of range.
The following table shows the additional records provided in Report Packet 55h when ION/UTC data is included.
|
Subtype 3: ION/UTC report |
||||
|---|---|---|---|---|
|
Byte |
Item |
Type |
Value |
Meaning |
|
ION parameters |
||||
|
6–13 |
ALPHA 0 |
8 (double) |
GPS ICD-200 |
|
|
14–21 |
ALPHA 1 |
8 (double) |
GPS ICD-200 |
|
|
22–29 |
ALPHA 2 |
8 (double) |
GPS ICD-200 |
|
|
30–37 |
ALPHA 3 |
8 (double) |
GPS ICD-200 |
|
|
38–45 |
BETA 0 |
8 (double) |
GPS ICD-200 |
|
|
46–53 |
BETA 1 |
8 (double) |
GPS ICD-200 |
|
|
54–61 |
BETA 2 |
8 (double) |
GPS ICD-200 |
|
|
62–69 |
BETA 3 |
8 (double) |
GPS ICD-200 |
|
|
UTC parameters |
||||
|
70–77 |
ASUB0 |
8 (double) |
GPS ICD-200 |
|
|
78–85 |
ASUB1 |
8 (double) |
GPS ICD-200 |
|
|
86–93 |
TSUB0T |
8 (double) |
GPS ICD-200 |
|
|
94–101 |
DELTATLS |
8 (double) |
GPS ICD-200 |
|
|
102–109 |
DELTATLSF |
8 (double) |
GPS ICD-200 |
|
|
110–117 |
IONTIME |
8 (double) |
GPS ICD-200 |
|
|
118 |
WNSUBT |
1 (byte) |
GPS ICD-200 |
|
|
119 |
WNSUBLSF |
1 (byte) |
GPS ICD-200 |
|
|
120 |
DN |
1 (byte) |
GPS ICD-200 |
|
|
121–126 |
RESERVED |
6 (byte) |
GPS ICD-200 |
Reserved (set to 0) |
|
---------- End of Subtype 3 ---------- |
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