Computed Fixed Beam Horizontal Coverage as Related to Redundancy in the AN/SQS-26CX Sonar Equipment.

摘要

Fixed beam horizontal coverage was assessed from beam patterns computed for arrays with assumed inoperative transducer elements, preamplifiers, power amplifiers, post amplifiers, and beam channels in the signal processor. The assessment was based primarily on changes in source level, receiving sensitivity and side lobe level. A large part of this memorandum is concerned with a study of the statistical variation in the number of inoperatives from one array to another within one transducer, for various percentages of assumed inoperative up to 50%. It was concluded that the major receiving sensitivity change due to inoperatives could be compensated by overall gain adjustment, but that some statistical variation would be present. In the transmit mode, it was assumed that normal operation is just below cavitation, so that loss in source level due to inoperatives cannot be compensated by driving power adjustment. The only detrimental effect of signal processing on the degradations is in the detector-averager, and then only for very small signal-to-noise ratio inputs.