RCB-F9T - Integration manual
•
pulse length/ratio
- Length or duty cycle of the generated pulse, either specifies a time or ratio
for the pulse to be on/off.
•
pulse length/ratio lock
- Length or duty cycle of the generated pulse, as soon as the receiver
has calculated a valid time from a received signal. Only used if the corresponding item is set to
use another setting in locked mode.
•
user delay
- A time offset of the TP output for adjustment in a user application. It adjusts the
time pulse position only with respect to GNSS time. Configuring a positive value will add a delay,
i.e. retard the pulse with respect to GNSS time. Conversely, a negative value will advance the
pulse. This configuration is available for all supported TP outputs.
•
lock to GNSS freq
- If this item is set, uses the frequency gained from the GNSS signal
information rather than the local oscillator's frequency.
•
locked other setting
- If this item is set, the alternative setting will be used as soon as the
receiver can calculate a valid time. This mode can be used, for example, to disable time pulse if
the time is not locked, or to indicate a lock with different duty cycles.
•
align to TOW
- If this item is set, pulses are aligned to the top of a second.
•
polarity
- If set, the first edge of the pulse is a rising edge (pulse polarity: rising).
•
grid UTC/GNSS
- Selection between UTC (0), GPS (1), GLONASS (2), BeiDou (3) and (4) Galileo
timegrid. Also affects the time output by UBX-TIM-TP message.
The maximum pulse length cannot exceed the pulse period.
Time pulse settings shall be chosen in such a way that neither the high nor the low period of
the output is less than 50 ns (except when disabling it completely), otherwise pulses can be
lost.
RCB-F9T time pulse 1 default configuration: UTC time, frequency is 1 Hz and pulse length is
100 ms when GNSS is not locked and 200 ms when GNSS is locked.
3.10.1.5.1 Example
The example below shows the 1PPS TIMEPULSE signal generated on the time pulse output
according to the specific parameters of the CFG-TP-* configuration group:
•
CFG-TP-TP1_ENA
= 1
•
CFG-TP-PERIOD_TP1
= 1 000 000 µs
•
CFG-TP-LEN_TP1
= 100 000 µs
•
CFG-TP-TIMEGRID_TP1
= 1 (GPS)
•
CFG-TP-PULSE_LENGTH_DEF
= 0 (Period)
•
CFG-TP-ALIGN_TO_TOW_TP1
= 1
•
CFG-TP-USE_LOCKED_TP1
= 1
•
CFG-TP-POL_TP1
= 1
•
CFG-TP-PERIOD_LOCK_TP1
= 100 000 µs
•
CFG-TP-LEN_LOCK_TP1
= 100 000 µs
The 1 Hz output is maintained whether or not the receiver is locked to GPS time. The alignment to
TOW can only be maintained when GPS time is locked.
UBX-22004121 - R01
3 Receiver functionality
Page 37 of 64
C1-Public
Early production information
