Comparing the Mettatec X5 Mobile Pro with a High-End Geodetic Receiver

Posted on January 27, 2024

X5-MOBILE-RTK

The accuracy of GNSS positioning methods, such as Real-Time Kinematic (RTK) and Post-
Processed Kinematic (PPK), depends on the context and how they are utilized. Both methods
can provide high precision, but they have key differences:

Real-Time Kinematic (RTK):

RTK delivers real-time precise positioning data. It requires a constant and stable connection to
a GNSS base station or correction network (Internet or radio).

Accuracy may be affected by signal interruption between the receiver and the base station.
Ideal for applications requiring real-time precise positioning data.

Post-Processed Kinematic (PPK):

PPK processes data after collection, allowing for more detailed review and correction. It does
not require a real-time connection to a base station, making it more flexible in remote
locations or areas with limited signal.

It can offer equal or even superior accuracy to RTK, as it allows for a more thorough analysis of
data. Ideal for applications where real-time data is not crucial, such as mapping, topography,
and certain types of geographic research.

Context of the Comparison:

For this comparison, RTK surveying was performed using NTRIP with our X5 Mobile Pro
equipment, with reference to a South G1 Plus Geodetic Receiver.

The points used as a Base Station were:

The base station used was MET01-X5R CORS, located in our facilities in San Borja District, Lima,
Peru.

The rovers used were:

X5 Mobile pro en modalidad NTRIP
X5 Mobile Pro in NTRIP mode
SOUTH G1 PLUS modo NTRIP
SOUTH G1 PLUS NTRIP mode

Test Development:

Both devices underwent an initial test.

Point surveys were conducted using SW Maps for the X5 Mobile Pro and SURPAD for the South
G1 Plus.

In both cases, the RTK method with NTRIP protocols was employed, comparing a sidewalk line
surveyed by both rovers.

  1. Continuous Survey Points in the Center of an RTK Sidewalk (NTRIP)
Levantamiento en SURPAD
Survey in SURPAD
Levantamiento en SW_MAPS
Survey in SW_MAPS

Results obtained in this test are presented below, with G1 Plus coordinates followed by X5
Mobile Pro coordinates, using the WGS84 – UTM Zone 18 South coordinate system.

Coordenadas con G1 Plus y seguidamente del X5 Mobile Pro

Following are the differences found in North, East, and Height:

Comparando el X5 Mobile Pro de Mettatec con un Receptor Geodésico de alta gama

Results:

Comparisons along the CAD line showed minimal differences between data collected with the
South G1 Plus Geodetic Receiver and the Metta X5 Mobile Pro. The Root Mean Square (RMS)
for all points is as follows:

Root Mean Square Error (RMSE)
EMC (X)EMC (Y)EMC (Z)
0.0220.0140.038

These results demonstrate how the X5 Mobile Pro GNSS quickly achieves centimeter-level
accuracy when receiving RTK differential corrections, comparable to a high-end geodetic
instrument. It’s worth noting that the X5 Mobile Pro can also receive corrections via radio from
any GNSS base, regardless of the brand, using our Universal X5 Radio.

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