Are some specific regions having trouble receiving AIS signals?
If so, in which areas might this be the case?
AIS signals can be affected by a variety of factors, including geographic location, environmental conditions, and technical limitations. While AIS has good data quality and coverage for providing global positioning services, some regions may experience issues with data reception rates. It is important to note that some of these issues are particularly prevalent in the Northeast Asia region, where ship traffic is high, and may vary in severity and occurrence depending on the specific situation.
To address these data quality issues, we use the following:
We use all available sources, including Terrestrial AIS and Satellite AIS, as shown in Figure 1, as well as Dynamic AIS data, which is AIS data stored on the vessel and fed directly from the satellite.
Figure 1) How AIS data is collected
Figure 2) and Figure 3) show the difference before and after the data source was added.
In Figure 3), you can see that the yellow data is now receiving more data compared to before
Figure 2) AIS data received prior to 2022
Figure 3) Data received after diversifying AIS data
How reliable is AIS data in general?
Assessing the overall level of AIS failure can be difficult due to a number of factors, including the quality and maintenance of the AIS equipment, environmental conditions, and the accuracy of the AIS data being transmitted. Although AIS is designed to be a reliable system, failures can occur from time to time due to factors such as technical malfunctions, signal interference, or improper signal transmission. However, the overall reliability of AIS signals is generally considered high, and most vessels comply with the standards required for AIS implementation.
In addition, we partner with global satellite operators like Orbcomm and Spire to ensure data redundancy. This means that if one provider experiences an issue, the other can seamlessly take over, providing uninterrupted service to our customers.
Figure 4) ORBCOMM's Data Coverage
Figure 5) Data Coverage From Spire
What alternative solutions can I explore if I continue to encounter data issues, such as missing AIS information or related challenges?
We know from experience that issues like outages and data unavailability can happen at any time, and we're prepared.
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First of all, the entire operating system is serviced in the cloud.
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Real-time monitoring and alarm system is in place in case of any failure or missing data, we take measures in the shortest possible time.
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In the case of missing data, we have established a system so that monitoring personnel can manually pursue and update the data through separate source checks.
In addition to physical errors, AIS data can also be corrupted by errors in the data itself, but our error detection process ensures that errors are corrected through pre- and post-data validation to ensure accurate data delivery.
In the case of Figure 6) Example of erroneous data, it can be difficult to determine the exact voyage of the ship when directly linking the voyages in chronological order, as it shows the voyage that appears as a yellow line.
In the example in Figure 7), you can see that the data is viewed as normal sailings when processed separately.
Figure 6) Example of Error Data
Figure 7) Data Post Self-processing