Methods and systems for evaluation of signal propagation across disparate time domains

An avionics system comprising:

• a plurality of line replaceable units;
• at least two disparate busses communicatively coupling said plurality of line replaceable units;
• and
• a referencing unit communicatively coupled to receive messages occurring on said at least two disparate busses, said referencing unit comprising a master clock and programmed to:
• reference the content of a first selected received message occurring on a first of said disparate busses to said master clock within the referencing unit;
• reference the content of a second selected received message to the master clock within the referencing unit, the second selected received message containing a parameter also contained within the first selected received message, the second selected received message occurring on a communications bus disparate from the communications bus upon which the first selected received message occurred;
• and
• provide, based on operation of said master clock, a common time reference for occurrence of the parameter in both the first selected received message and the second selected received message.

A referencing unit comprising:

• a processing device;
• a master clock coupled to said processing device;
• and
• a plurality of receivers communicatively coupled to said processing device and said master clock, said receivers each operable for communicative coupling to a communications bus, said referencing unit programmed to:
• reference the content of a first message received at a first of said receivers from a first communications bus to said master clock;
• reference the content of a second message received at a second of said receivers from a second communications bus, disparate from the first communications bus, to said master clock, the second message containing a parameter also contained within the first message;
• and
• generate a common time reference for occurrence of the parameter in both the first message and the second message.