Clockadjust Enables Clock Adjustments - Novatel GPStation-6 User Manual

Commands
4.2.2

CLOCKADJUST Enables clock adjustments

All oscillators have some inherent drift. By default, the receiver will steer its clock to accurately
match GPS time. The GPStation-6 receiver automatically locks to the 10 MHz reference signal
generated by the OCXO internal to the enclosure. Therefore, when clock adjustments are enabled the
receiver will steer the OCXO towards GPS time.
Note that the act of steering the clock may increase phase noise on the measurements. Since the clock
adjustments should be very small on an OCXO, the default configuration is to leave clock steering
enabled.
When clock steering is disabled, the clock drift over a very long period of time could cause the
receiver time offset from GPS to exceed its limits. Disabling clock steering will ensure the lowest
possible phase noise on the phase scintillation measurements.
Either setting is valid and can be selected by user preference given application needs.
Abbreviated ASCII Syntax:
CLOCKADJUST switch
Input Example:
clockadjust disable
Field
Field
Type
1 CLOCKADJUST
header
2 Switch
GPStation-6 User Manual Rev 2
ASCII Binary
Value Value
- -
DISABLE 0
ENABLE 1
Description
This field contains the
command name or the
message header
depending on whether the
command is abbreviated
ASCII, ASCII or binary,
respectively
Disallow adjustment of
internal clock
Allow adjustment of
internal clock
Message ID: 15
Binary Binary Binary
Format Bytes Offset
- H 0
ENUM 4 H
48