epoch

The measurement interval of a GNSS receiver. The epoch varies according to the survey type: for real-time surveys data is collected at a rapid data rate (for example, one second). For static surveys data is typically collected at a slower rate (for example, every 5 seconds). For example, if a rover receiver measures data every 5 seconds and the base receiver measures data every 15 seconds, then the processor only uses every third measurement from the rover receiver.