If you are researching aviation security but do not have authorized access to Doc 9811, you may find relevant (though sometimes also restricted) information in these related documents:
For aviation authorities and Air Navigation Service Providers (ANSPs), Doc 9811 is the "instruction manual" for the GANP. It ensures that when a new technology—like System-Wide Information Management (SWIM) Space-Based ADS-B icao doc 9811 pdf link
For broader technical standards that are not restricted, you can check the general ICAO Publications Catalogue to see what is currently available. If you are researching aviation security but do
: Access is strictly limited to national civil aviation authorities, airports, and aircraft operators responsible for implementing security measures. : You can request access or purchase the
: You can request access or purchase the document through the ICAO Store . Access usually requires an authorized ICAO Store account and specific credentials.
ICAO documents, including Doc 9811, are for download directly from ICAO’s main website. However, access is possible through: