| 摘要 |
In a highly structured communication system for use in tactical military data links such as Link 11, defined by a NATO Standardization Agreement (STANAG), messages containing information such as identifiers of the type of vehicle or participating unit and their speed, bearing or altitude are decoded and analysed using a toolkit which reduces the need for manual live testing and assessment by a human operator. The toolkit checks both a message level (52) which identifies the type of data and in the 48-bit frame, and the field level (54) which relates to the data values themselves via a STANAG database (56) and an Implan (Message Implementation Plan) database (58), and issues an alert (66) if the data does not comply with the predetermined standard or protocol. The databases list all possible messages (eg. a finite number of different vehicles or units) and the particular data values associated therewith (eg. finite, discrete values of altitude for messages from aircraft), and so eg. an hour value of greater than 24 or a ship having an altitude value would display an alert. The first 4 bits of each message (bits 00-03 in fig. 2) are the message number (MN) which dictates how the other 44 bits should be decoded, and filters (80-92, Fig. 5) can ensure that only a subset of messages are analysed.
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