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18. RTK: Advanced
In this dialog you can select the signal processing parameters and RTK setting:
- From RTK Position, select the method of RTK corrections definition:
- Extrapolation (sometimes described as asynchronous) - the RTK engine will extrapolate the base station's carrier phase measurements to the current epoch (note that the truth carrier phases measured at the base cannot be transmitted and received at the rover instantly). The final positioning accuracy may be somewhat lower due to additional extrapolation errors, which may be up to a few millimeters vertical and horizontal for a one second extrapolation time.
or
- Matched Epoch (sometimes described as synchronous) - the RTK engine does not extrapolate the base station's carrier phases in position computation. Instead, the engine will either compute a delayed position or simply output the current stand-alone position (while waiting for new RTCM / CMR messages from the base station). Note that the delayed position is computed for the time (epoch) to which the last received base station's carrier phase measurements correspond. Accuracies achievable in delay mode are normally on a level with those of post-processing kinematic.
- You can control the maximum number of satellites to be included in the RTCM or CMR messages, transmitted by a modem of the base receiver. To do this, check the Base Sat Limit and enter a satellites number starting from 6.
- By default the Multipath Reduction is selected to enable the use of a special signal processing technique for reduction of C/A code phase multipath and C/A carrier phase multipath. This option is useful for collecting raw data near from metallic objects, or trees and high buildings.
- If the GNSS receiver is collecting raw data in high-vibration environment, we recommend to select High-Vibration Environment (QLL) to enable Quartz Lock Loop technology to minimize the vibration-induced impact on acquisition and tracking capabilities of the GNSS receiver.
- From the Base Station Make drop-down list, select the manufacturer of the Base receiver to designate Base Make (IGS Class) used by the rover receiver to account for GLONASS biases.
- Optionally, you can select the settings of the RTK engine. To do this, select the RTK Settings option from the pop-up menu that displays by clicking
in the top left corner.
- Click Next. The wizard will open the last screen to create the RTK configuration.
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