Base Observation Files – LP360

The Base Observation Files dialog is accessed from the Base Observation Files button found on the following dialogs:

This dialog allows you to review and manage the GNSS base station observation files that will be used during processing. These files provide the reference data needed for Post Processing Kinematic (PPK) workflows and are essential for accurate trajectory generation.

Dialog Overview

The dialog presents a table listing each base observation file that has been added. Each row represents one GNSS receiver’s observation file and includes the following columns:

Receiver / Antenna

Displays the detected or user‑assigned receiver and antenna metadata (e.g., SPS855 / TRM55971.00). LP360 reads the base station antenna model from the observation file to determine whether a valid NGS antenna calibration is available. If the antenna model is recognized, it is displayed normally. If the antenna model is missing, unknown, or no calibration exists, the antenna name is shown in red.

Figure 2: Missing antenna model shown in red with warning tooltip

Hovering over a red antenna model displays a warning tooltip indicating that no antenna calibration was found and that APC‑to‑ARP offsets will not be applied if processing continues. In this case, LP360 will prompt for confirmation before trajectory processing proceeds.

For a detailed explanation of this warning, when it may be acceptable to proceed, and how to resolve missing antenna calibrations, see Troubleshooting: Missing Antenna Calibration.

UTC Start

The start timestamp (UTC) of the observation file.
If the file contains multiple sessions, the earliest timestamp is shown.

UTC End

The end timestamp (UTC) of the observation file.
This helps ensure the base data covers the entire flight or sensor acquisition period.

Path

The local or network file path to the base observation file.

Controls

Add ()

Opens a file browser for selecting new base observation files (e.g., RINEX, .obs). Multiple files may be added.

Remove ()

Deletes the selected base observation file(s) from the list.
This does not delete the file from disk—only removes it from the processing configuration.

OK

Saves the current file list and returns to the calling dialog.

Cancel

Closes the dialog without saving changes.

Help

Opens this help documentation related to base observation file usage.

Minimum Recommendations for Base Observation Files

To ensure reliable and accurate processing, base GNSS observation files should meet the following minimum criteria:

Dual-frequency L1/L2 static GNSS.
1 Hz sampling rate.
Static (not kinematic) data only.
≥2 constellations preferred (1 constellation = warning/fail in internal QA).
Open sky (≥15° mask).
Proper antenna model (NGS-calibrated).
Correct coordinate, matched to average position; Δ < 10 m recommended.
Overlap with entire flight duration.
Under the recommended baseline according to the sensor's position and orientation system (POS) for consistent results.
RINEX or supported native format (T02 ok; others must be converted; more native format support coming soon!).

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