BASETIME
Below is an example of the BASETIME block:
[BASETIME]
GPS_WEEK_REFERENCE = 2300
The BASETIME block contains the following configuration parameter:
GPS_WEEK_REFERENCE
Default: 2300
Parameter Class: Tunable
Impact of Change: Medium
Technical Info: Reference GPS week used to resolve truncated navigation-message week numbers into full GPS week numbers. The receiver chooses the full week closest to this reference when decoding navigation data.
Practical Tuning Info: This should rarely be adjusted, but set near the expected collection date; it does not need to be exact, but should be within the correct rollover era. For 10-bit GPS week fields, keep it within roughly 512 weeks (about 10 years) of the true GPS week to avoid decoding navigation data into the wrong epoch.
GPS week rollover occurs every 1,024 weeks, or about 19.6 years. Some GPS navigation messages transmit the week number using only 10 bits, so the value can only range from 0 to 1,023 before wrapping back to 0. GPS_WEEK_REFERENCE tells the receiver which 1,024-week era to use when converting that truncated week number into a full GPS week. See here for a calendar date to GPS week mapping.