Which term refers to the required level of "faithfulness" in received signals?

The term that refers to the required level of "faithfulness" in received signals is fidelity. In the context of electronic warfare and signal processing, fidelity describes how accurately a received signal represents the original transmitted signal. High fidelity means that the reproduction of the signal is very close to the original, with minimal distortion or loss of information. This is crucial in warfare and communication systems where even slight variations can affect the effectiveness and clarity of the information being transmitted. Timeliness refers to how quickly a signal is received, survivability relates to the ability of systems to withstand or recover from attacks, and completeness refers to having all necessary parts or data rather than the quality of the signal itself. Thus, fidelity is the most appropriate term to describe the faithfulness of received signals.