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:
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 (“Vereda” in Spanish) line surveyed by both rovers.
Continuous Survey Points in the Center of an RTK Sidewalk (NTRIP)
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.
Following are the differences found in North, East, and Height:
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): 0.022
EMC (Y): 0.014
EMC (Z): 0.038
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.
Do you have questions about this article?
Get in touch with METTATEC, and they would be happy to answer any questions you have about pricing, suitability, availability, specs, etc.