Background of the plan

Automatic Identification System (AIS) is a new navigation assistance system applied to maritime safety and communication between ships and shore, as well as between ships. Often composed of VHF communication equipment, GPS positioning devices, and communication controllers connected to onboard displays and sensors, it can automatically exchange important information such as ship position, speed, heading, ship name, call sign, etc. However, as an open data transmission system, AIS may experience leakage and exposure of location information during ship supervision, dispatch, and task execution, which brings many inconveniences to effective law enforcement.

Scheme Introduction

The Secure Automatic Identification System（S-AIS） mainly provides a solution for the supervision, dispatch, and execution of law enforcement vessels, aiming to build a comprehensive management system for law enforcement and supervision departments and improve the efficiency of law enforcement and supervision. This system utilizes AIS encryption technology to establish AIS private network communication, ensuring the dynamic confidentiality of law enforcement vessels, avoiding real-time tracking of their positions, and ensuring normal VHF communication between law enforcement vessels and between law enforcement vessels and regulatory systems.

system architecture

major function

Public AIS operates on two global very high frequency channels (AIS1 and AIS2). The encrypted AIS link uses the third channel selected by the user to ensure minimal interference in public AIS communication. The encrypted data link can be used in parallel with AIS1 and AIS2, allowing encrypted AIS users to see the complete AIS image at any time. The S-AIS system supports external operation mode switching and can switch between the following modes.

• Normal AIS mode (activated)

This is the standard SOLAS mode. This system performs all the functions of a regular A-level AIS. Do not use encrypted AIS.

• Silent mode (passive)

The system will not broadcast any content through very high frequency. It will receive standard AIS messages and encrypted AIS messages.

• Tactical mode (protected)

Only transmit encrypted data. Receive and process standard AIS information and encrypted information on AIS channels. Mobile devices will automatically transmit encrypted location reports.

• Mixed mode

The encrypted data link is in an active state, and the device receives both open and encrypted AIS messages. This device can transmit both public and encrypted AIS data.

Advantages of the plan

• Based on AIS encryption technology, it can prevent ordinary ships from obtaining real-time positions of law enforcement ships, making it easier to conduct surprise inspections of the real situation of ship operations.
• Using AIS/VHF communication methods to ensure location sharing between law enforcement vessels and real-time reporting of their location information.
• Support VHF real-time information communication between law enforcement vessels and between law enforcement vessels and regulatory systems to ensure timely response of relevant information.
• The regulatory system can send information to law enforcement vessels to achieve remote operation guidance.
• Support the grouping management of law enforcement vessels for unified command and task scheduling based on actual situations.
• The regulatory system can remotely view real-time video surveillance images of the surrounding area to achieve operational supervision of law enforcement vessels.
• The regulatory system displays real-time dynamic information of ships within the regulated sea area, facilitating observation of ship operations; At the same time, electronic fences, speed limit alarm zones, intrusion warning zones, etc. can be designated to alert ships for illegal operations, facilitating timely enforcement measures.