High Precision GNSS Products

Unicore high accuracy gps module are based on the NebulasIV GNSS SoC.

With all-constellation all-frequency support and designed for use in high-
precision applications such as UAV, robots, precision agriculture, surveying,
mapping, vehicle navigation, telecom and more, NebulasIV™ offers outstanding
RTK and Heading performance at affordable pricing.

High Precision GNSS Products Features
Driven by a full-constellation and full-frequency RTK engine, Unicore's RTK
algorithm takes advantage of triple and quad frequency observables, effectively
mitigating ionospheric residuals.

RTK can provide real-time centimeter-level glonass precision positioning, which
requires real-time base station data. In practical applications, radio or
wireless network communication is often interrupted. During the interruption of
the base station data, RTK’s positioning accuracy decreases quickly.
Unicore’s RTK KEEP technology can maintain the centimeter-level positioning
accuracy for more than 10 minutes after the interruption.

FAQS
High Precision GNSS Products FAQs
What is the impact of discontinuous transmission of differential data or
excessive delay on RTK solution?
The more stable the transmission of differential data is, the greater the help
for differential positioning, and the more stable the accuracy will be. If the
packet loss is very serious on the transmission link of differential data and
the differential age usually exceeds 15, the reliability and accuracy of RTK
will decrease.

RTK eliminates ionospheric errors, tropospheric errors, satellite orbital
errors, and satellite clock bias through the correlation of errors between the
base station and rover station, thereby achieving centimeter-level positioning
accuracy. If the transmission of the base station data is interrupted, the
correlation between the rover station observations and the aforementioned
errors in the base station data tens of seconds ago will be weakened, and the
longer the time, the weaker the correlation, and then the positioning accuracy
will drop fast.

Ordinary receivers will not be able to provide RTK service after 20 seconds
since the interruption of the differential data transmission. But Unicore's RTK
KEEP technology, which uses models and estimation to eliminate the satellite
orbital errors, clock bias, ionospheric and tropospheric errors, as well as
other factors that affect the positioning results, can maintain centimeter-
level accuracy for more than 10 minutes after the transmission of the
differential data from the base station is interrupted. This greatly improves
the availability of RTK service, especially for applications such as UAVs and
forestry operations, where radio or wireless network communications are often
interfered or blocked.

Signal acquisition process
The NebulasIV chip is upgraded on the basis of NebulasII. It can capture and
track each frequency independently.

For more information about precision gps receiver and accurate gps module,
please feel free to contact us!

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