Because the IEC documents aren't free you can buy them at the IEC www.iec.ch [1]

Some of the IEC documents concerning AIS are:

• 61097 AIS-Sart;
• 61162 Maritime Navigational and radiocommunication equipment and systems;
• 61993 Class-A;
• 62287-1 Class-B CS;
• 62287-2 Class-B SO
• 62288 Presentation of navigation related information;
• 62320-1 Base Station;
• 62320-2 AtoN;
• 62320-3 AIS repeater station.