Three ways of application of shipborne automatic identification system (AIS) in ship navigation are systematically sorted out aiming at the safety hazard imposed due to the problem of the shipborne AIS only receiving messages but not sending out messages when it is in use. The timing of the information broadcast is given for the shipborne AIS in the severe weather conditions, narrow waterway and heavy traffic sea areas combined with the usage requirements. The reasonable and timely broadcasting of the AIS information of military ships can provide the effective means of the safety guarantee in the complex and changeable navigation environment.

In recent years, the US has developed the pre-warning observation platform for the sea-based ballistic missile, which can provide the pre-warning observation and the precise identification of the ballistic missiles from other countries. It has become a key point of the pre-warning system for US sea-based ballistic missiles. From the present status of the development of the pre-warning observation platform for the US sea-based ballistic missile, it studies and analyzes the characteristics and the main functions, and preliminarily summarizes the future development trend. Some considerations are presented for the development of the pre-warning observation platform for the sea-based ballistic missiles in China.