Accession Number : ADA188424

Title :   Passive Acoustic Tracking and Filtering Problems with Time Scales.

Descriptive Note : Final rept.,

Corporate Author : ALPHATECH INC BURLINGTON MA

Personal Author(s) : Caromicoli, Adam ; Washburn, Robert B ; Willsky, Alan S

PDF Url : ADA188424

Report Date : Nov 1987

Pagination or Media Count : 231

Abstract : The airborne ASW tracking problem is becoming progressively more difficult every year. The continued efforts of our adversaries toward quieter, faster assets with longer ranged weapons imply the need or more powerful localization and tracking systems able to extract maximum information from lower signal strengths and to obtain fire control solutions as quickly as possible. Current systems work by extracting bearing and Doppler information from narrow band signals and then using this information in Extended Kalman filter tracking algorithms. To operate successfully such systems require a stable narrow band line and relatively high signal-to-noise ratio (narrow band signal strength to background noise strength). Unfortunately, these requirements are becoming increasingly more difficult to satisfy as targets become quieter. Several new sensors planned for the future (e.g., various types of array buoys) will help prolong the usefulness of current tracking systems, but it is clear that within very few years new tracking systems will be required to exploit many different types of measurements and to operate at lower SNR levels than possible with current systems.

Descriptors :   *ACOUSTIC TRACKING, *ANTISUBMARINE WARFARE, *BUOYS, *DETECTORS, *DOPPLER SYSTEMS, *FIRE CONTROL SYSTEMS, *PASSIVE SYSTEMS, AIRBORNE, ARRAYS, BACKGROUND NOISE, EXTRACTION, FILTERS, HIGH RATE, NARROWBAND, SCALE, SIGNAL TO NOISE RATIO, SIGNALS, SOLUTIONS(GENERAL), STABILITY, STRENGTH(GENERAL), TIME, TRACKING, WEAPONS

Subject Categories : Acoustic Detection and Detectors
      Undersea and Antisubmarine Warfare
      Fire Control and Bombing Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE