The role of situation awareness in naturalistic decision making

A digital phase detector which periodically detects the phase angle theta k of a carrier signal in which data are encoded as discrete phase changes. A coherent or differential phase-modulated carrier signal is split into its in-phase and quadrature phase components RoSin theta (t) and RoCos theta (t). Each signal component is sampled at a predetermined modulation interval and converted into a digital word having the form RoCos theta k and RoSin theta k. In one configuration, the two signal components are applied to a digital divider network which forms the quotient PSI of the two digital words such that ¦ PSI ¦ 1 operation, which forms a digital reference phase angle PHI limited to an angle </= 45 DEG is corrected by selection logic to form the desired phase angle theta k. Once theta k is known for each modulation interval, the encoded data may be readily extracted, since theta k is proportional to the encoded data.