These three links are asynchronous with respect to each other. In addition, data from systems whose acquisition rates are unrelated to the links must also be correlated to data from systems acquiring data based on events from any of the links. All systems requiring data correlation must have timestamp information using a common reference. A standard method for passing timestamp information to the console level computer needs to be defined. Once standard methods are developed, it is critical to insure that all ADO, Manager, and Application code conforms to the defined methods.
Data Sources Following is a list of systems that require data correlation.
This list may not be complete. The basic concept for data correlation is that data sent to the console level computers includes either timestamp or index information. For many cases where arrays of data are transferred, a single timestamp can be used to indicate the time of the first value in the array. In this case a value indicating the time between data samples is necessary. This value is known when data is acquired at a predetermined interval.