Abstract:

Satellite communication is efficient for wide area alert information distribution. But for appropriate and accurate warning，it is necessary to encode the alert information elements. This paper first introduces the basic contents of alert information，then analyses the coding mechanisms of each information element，especially the influenced area，based on the transmission characters of satellite communication. In the end，this paper gives out an alert encoding mechanism for DAB satellite alert distribution according to the current achievements of geographic code，institution code and emergency management policies of China. Practical use indicates that this coding mechanism is ideal for satellite based alter distribution.

Key words: satellite communication, alert information distribution, information encoding, geographic code, regionalism code