Operational Field Validation
The PORG project is committed to validating its predicted GNSS clock and orbit products under genuine operational conditions.
While routine validation is performed against established precise reference products such as CODE, ESA, GFZ and IGS, an equally important part of the project is assessing how the products perform in realistic positioning scenarios using commercially available GNSS receivers.
The objective is simple: to determine whether forward-predicted precise products can provide reliable, high-accuracy positioning without dependence on continuous real-time correction streams during operation.
Validation Philosophy
Our philosophy is straightforward:
Take the products to places where they are genuinely needed.
Rather than relying solely on controlled laboratory testing, PORG is being evaluated in real-world environments where communications infrastructure may be unavailable, unreliable or undesirable.
These include:
- Remote rural locations
- Coastal and offshore environments
- Mountainous terrain
- Areas with poor or no mobile phone coverage
- Any location where continuous internet-delivered correction services cannot be relied upon
The aim is to understand how the products perform under the conditions for which they were originally conceived.
Current Test Platform
Current field validation is being carried out using the Columbus EX-1 dual-frequency GNSS receiver.
The receiver records raw GNSS observations which are subsequently processed using the latest operational PORG SP3 orbit and RINEX CLK clock products.
Processing is performed using standard PPP software, enabling direct comparison between:
- Receiver navigation solutions
- Broadcast-only positioning
- PPP using PORG predicted products
This provides an independent assessment of operational positioning performance using data generated prior to the observation period.