Correlators using M.O.S.T.'s in sonar applications

Abstract

Correlators are powerful tools for both spectrum analysis and identification of signals in high noise fields. However, in sonar work the storage required to handle the long signals leads to large and expensive equipment. As a result “on-line” correlators have not found extensive use in commercial applications.The large scale integration technology based on the “insulated gate transistor”,‡‡A glossary of terms is given in the Appendix. known as M.O.S.T., is ideal at sonar frequencies and gives a considerable improvement in size, cost and reliability.This paper shows how the technology can be used, in existing digital correlator systems based on time compression methods, to extract these advantages and add a greater flexibility to equipment. It also shows how the technique can be applied to make real-time analysis practical, giving a considerable increase in time-bandwidth product and versatility, using a “polarity coincidence counter”.