CORRELATORS FOR SIGNAL RECEPTION
HARVARD UNIV CAMBRIDGE MA ACOUSTICS RESEARCH LAB
Pagination or Media Count:
Study was undertaken to investigate the application of correlation techniques to acoustic receiving systems. Correlators multiplier-averagers were analyzed and compared with detectors rectifier-averagers of various power laws from the standpoint of their use in signal reception systems. Comparison was made in terms of SN ratio for the limiting case of small input SN ratio and long averaging time. Of the various detectors, the square law appeared somewhat superior for determining the presence of a small signal in a noise background. When 2 samples of the signal in incoherent background noises were available, the correlator showed the advantage that no constant terms independent of the signal appear at its output. Analysis of 2 circuits, the polarity-coincidence and the linear rectifier correlators, showed that both of these were slightly inferior to true correlators in output SN ratio.
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation