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How to log data for PPK UAV mapping

This guide shows how to record logs for PPK UAV Mapping and download them from UAV mapping kits using ReachView 3.

With PPK workflow, accurate positioning does not happen in real time, all algorithms are applied afterward. Both base on the ground and rover on a UAV record raw GNSS logs which will be further used for post-processing of the data set, geotagging of the resulting photos, and mapping in the photogrammetric software.

note

To record time marks in the raw data log, you should ensure smooth synchronization of Reach and a camera. We recommend using the Reach M+/M2 hot shoe adapter.

tip

To learn more about PPK mapping, check the following articles:

Configure logging on the rover

To configure logging on your Reach M+/M2 rover, follow the steps below:

  1. Go to GNSS Settings and set the satellite systems and update rate according to the following requirements:

Select the satellite systems and set the update rate at 10 Hz.

note

Reach M2 tracks GPS, GLONASS, Galileo, QZSS, and BeiDou satellite systems.

  1. Go to the Logging screen in ReachView 3.

  2. Tap Settings in the Raw data section.

  3. Choose the RINEX format in the Raw data section.

    note

    If you do not know which version of RINEX you need, we recommend using RINEX 3.03.

    tip

    While recording in the RINEX format, you can record the UBX file as a backup. Tap the gear icon to access Logging settings and check the box marked Backup source data for RINEX.

  4. Tap Custom.

  5. Select the same satellite systems as in GNSS Settings and set the logging interval at Full rate (as in GNSS settings).

  6. Do not use Antenna height.

    note

    We recommend leaving the antenna height to 0. Usually, photogrammetric software has the feature of calculating the antenna offset (camera center position relative to the antenna position).

  7. Leave the Marker name field empty.

  8. Tap Apply.

  9. Enable log recording by tapping Start recording.

    tip

    You can start recording automatically when your receiver is turned on. Tick the corresponding field in the settings.

  10. Stop log recording by tapping the End recording button.

    caution

    Wait for data processing to finish.

Configure logging on the base

To configure logging on your Reach RS+/RS2 base, follow the steps below:

  1. Go to GNSS settings, select the same satellite systems as for Reach M+/M2 and set the update rate at 1 Hz.

  2. Go to the Logging screen in ReachView 3.

  3. Tap Settings in the Raw data section.

  4. Choose the RINEX format in the Raw data section.

    note

    If you do not know which version of RINEX you need, we recommend using RINEX 3.03.

    tip

    While recording in the RINEX format, you can record the UBX file as a backup. Tap the gear icon to access Logging settings and check the box marked Backup source data for RINEX.

  5. Choose the same satellite systems as in GNSS settings and set the logging interval at Full rate (as in GNSS settings).

  6. Enter the measured height to the bottom of the receiver.

  7. Leave the Marker name field empty.

  8. Tap Apply.

  9. Enable log recording by tapping Start recording.

    tip

    You can start recording automatically when your receiver is turned on. Tick the corresponding field in the settings.

  10. Stop log recording by tapping the End recording button.

Download logs

To download logs, follow the steps below:

  1. Go to the Logs section at the bottom of the Logging screen.

    tip

    You can also find information on the logs size and recording date and time here.

  2. Tap the Download logs button.

    caution

    Wait for data processing to finish.

  3. Save your log depending on the device you use.

    note

    If you do not need your logs anymore, you can delete them using the Edit button.

When the logs are downloaded, you can start working with your data in Emlid Studio.