So I have been investigating target association lately, and I have found that overlaying AIS targets on the radar is a possibility. This allows you to validate a radar blob with the AIS target I guess. I have also seen that you can overlay ARPA targets on the ECDIS, and also show AIS targets on the…

You can have all kinds of fun if the radar menu is not set up correctly with the heading inputs, the AIS version of the target can end up 5 or 10 degrees off the radar heading along with all the navaids and so on. It can be a true or magnetic issue or you might have to get into the service menus for…

It should be possible with something that associates the AIS target with the radar target with the option of merging the two targets into one.

[image] curious_engineer: Does each radar have it’s own ARPA? Are these radars completely disconnected? Because then you have three sources of information about targets in your surroundings, one from S-band, one from X-band and one from AIS. Deep-sea ships are required to have two radars, one…

I am sure it could be,the radar would use ARPA to tag an AIS target when they matched and then move the AIS symbol/ident around in real time. I have never actually seen a radar that does that though, but I certainly haven’t seen every kind of radar.

[image] yacht_sailor: in close quarters I have seen a boat cross my bow and visually and on radar be on one side and the lagging AIS still be on the other side. One of the reasons why this could be happening is that the AIS transmitter on the other vessel is not sending data on a frequent int…

I value AIS and I value ARPA, but I do not like the lack of understanding some officers have on each systems limitations. AIS targets on radars are nice until you realize that the person operating the radar might not actually be plotting ARPA. More times than not they highlight the AIS target and th…

[image] curious_engineer: Does each radar have it’s own ARPA? Are these radars completely disconnected? anybody who cares to read user guide for o/b radar S & X band will find that both have the so called Master /Slave mode and I have seen this feature since 1992 on all ships.

There are 2 types of AIS units, Class A and Class B. Class A are compulsory on commercial vessels >300GT. These units transmit all of their info every 2 seconds for moving and manoeuvring vessels, and up to 3 mins if at anchor. Class B units transmitting times however can be up to 5 seconds apart …

The AIS triangle symbol is near, but not on top of the radar target so that you can select the radar target, not the AIS symbol for the ARPA to plot. On a weak target or at a distance, the ARPA may track the AIS symbol instead of the actual radar target. There is a very wide variety in the ability…

Target association (radar S/X, AIS)

Engineering

Kennebec_Captain February 6, 2024, 1:36pm 7

Good thread here. How are you using AIS?

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Target association (radar S/X, AIS)

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