Ionosphere Information (Sub ID 0x0FB)
Applicable to: UC6580, UM670A, UM680A
This message outputs the ionosphere parameters broadcasted by GPS and BDS. See the following table for the details. The data transmission uses Big Endian method.
| ID | Field | Type | Description | Bytes | Byte Offset |
|---|---|---|---|---|---|
| 1 | System | U8 | 0 - GPS; 1 - BDS | 1 | 0 |
| 2 | a0 | S8 | Alpha parameter constant term; LSB: 2^-30 | 1 | 1 |
| 3 | a1 | S8 | Alpha parameter 1st order term; LSB: 2^-27 | 1 | 2 |
| 4 | a2 | S8 | Alpha parameter 2nd order term; LSB: 2^-24 | 1 | 3 |
| 5 | a3 | S8 | Alpha parameter 3rd order term; LSB: 2^-24 | 1 | 4 |
| 6 | b0 | S8 | Beta parameter constant term; LSB: 2^11 | 1 | 5 |
| 7 | b1 | S8 | Beta parameter 1st order term; LSB: 2^14 | 1 | 6 |
| 8 | b2 | S8 | Beta parameter 2nd order term; LSB: 2^16 | 1 | 7 |
| 9 | b3 | S8 | Beta parameter 3rd order term; LSB: 2^16 | 1 | 8 |
| Total | 9 |