TABLE 1
Relevant Iris Telemetry Fields for Computing Time and Total Count Phase
| Field Name | Size | Description |
|---|---|---|
| 1PPS Count | 4 bytes | Running integral count of 1PPS seconds, which can accumulate up to 232 seconds (or approximately 136 years) |
| Iris Time (seconds) | 4 bytes | Count of seconds since Iris was turned on based on TCXO ticks; increments each time the subseconds counter rolls over |
| Iris Time (subseconds) | 4 bytes | Count of 50-MHz TCXO ticks; rolls over to 0 after 49,999,999 |
| Total Carrier Phase (TCP) | 8 bytes | Integral number representing the total count phase since carrier lock; determines a floating-point estimate of phase cycles using  |