Epo; Locus; Multi-Tone Aic - Quectel L76 Hardware Design

GNSS Module Series
EASY™ feature works as embedded software which can accelerate TTFF by predicting satellite
navigation messages from received ephemeris. The GNSS engine automatically calculates and predicts
orbit information for up to 3 days after first receiving the broadcast ephemeris, and saves the predicted
information into the internal memory. The GNSS engine will use the information for positioning if there is
not enough information from satellites. As a result, the function is helpful for positioning and TTFF
improvement.
The EASY™ function can reduce TTFF to 5 s in warm start. In this case, RTC domain should be valid. In
order to gain enough broadcast ephemeris information from GNSS satellites, the GNSS module should
keep tracking the information for at least 5 minutes in good signal conditions after it fixes the position.
EASY™ function is enabled by default. For more information about the corresponding command to
disable EASY™ function, see document [1].

1.7.2. EPO™

The modules all feature a function called EPO™ (Extended Prediction Orbit) which is a world leading
technology that supports 30-day orbit predictions to customers. Occasional download from the EPO
server is needed. For more information, see document [2].

1.8. LOCUS

These modules support the embedded logger function called LOCUS. This function can automatically log
position information to internal flash memory when enabled by dedicated LOCUS commands. With this
function, the host can save power consumption and does not need to track the NMEA information all the
time. LOCUS provides typically more log capacity without any added costs.
Software commands can be used to query the current state of LOCUS. For more information about these
commands, see document [1].
The raw data which MCU gets must be parsed via LOCUS parser code provided by Quectel. For more
details, please contact Quectel technical support.

1.9. Multi-tone AIC

The modules all support a function called Active Interference Cancellation (multi-tone AIC) to decease
harmonic distortion of GNSS signal induced by RF signal from Wi-Fi, Bluetooth, and the 2G and 3G
networks.
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