Systems, methods, and devices enable spectrum management by identifying, classifying, and cataloging signals of interest based on radio frequency measurements. Each combination includes a predictive parameter and at least one reference picture number determined in advance for the reference picture. If the actual rotor position is known to be one of \u03c9 and \u03c9+\u03c0, for example as indicated by a resolver, the proposed invention can be used to determine whether the actual position is \u03c9 or \u03c9+\u03c0. A bolt and firing pin assembly are attached to the cylinder top end.