A Rapid Correlation Echo Ranging System. Open PDF Document Details Document Type Technical Report Publication Date Oct 04, 1955 Accession Number ADA051527 Entities People E. C. Westerfield Organizations Navy Electronics Laboratory Tags Communities of Interest Counter IED Ground and Sea Platforms DTIC Thesaurus Topics Bandpass Filters Carrier Frequencies Color Centers Correlators Department Of Defense Echo Ranging Filters Filtration Frequency Gain Generators Low Pass Filters Noise Generators Range Finding Sampling Shift Registers