GT-1612-MTBD
GPS&Beidou Receiver Module
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Page 18 of 35
Revision: V2.0.1-January 2015
Figure 11:
RS-232 Level Shift Circuit
2.6. EASY Technology
EASY technology works as embedded software which can accelerate TTFF by predicting satellite navigation
messages from received ephemeris.The GPS&Beidou engine will calculate and predict orbit.
information automatically up to 3 days after first receiving the broadcast ephemeris, and then save the predicted
information into the internal memory. GPS&Beidou engine will use the information for positioning if no enough
information from satellites, so the function is helpful for positioning and TTFF improvement.
The EASY function can reduce TTFF to 5s in warm start. In this case, RTC domain should be valid. In order to get
enough broadcast ephemeris information from GPS&Beidou satellites, the GPS&Beidou module should receive the
information for at least 5 minutes in good signal conditions after fixing the position.
EASY function is enabled by default. Command “$PMTK869,1,0*34” can be used to disable EASY.
2.7. Multi-tone AIC
GT-1612-MTBD module provides an advanced technology called multi-tone AIC (Active Interference
Cancellation) to reject RF interference which comes from other active components on the main board.
Up to 12 multi-tone AIC embedded in the module can provide effective narrow -band interference and jamming
elimination. The GPS&Beidou signal could be recovered from the jammed signal, which can ensure better navigation
quality. AIC is enabled by default, closing it wi save about 1mA @VCC=3.3V consumption. The following commands
can be used to set AIC.
Enable AIC function: “$PMTK 286,1*23”.
Disable AIC function: “$PMTK 286,0*22”.
