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  • Core Business - Underwater Acoustics

CANTASS PAS - CANTASS Post Analysis System

An advanced post-mission analysis system that processes, stores, analyses and classifies sonar data collected by towed arrays

Contracted awarded by Litton Systems Canada for the development of major real-time processing elements of the CANTASS PAS

Sonar Acoustic Research and Development Software

The Canadian Towed Array Sonar System Post-Mission Analysis System (CANTASS PAS) is an extension of the shipboard sonar system used to analyse the acoustic data collected by CANTASS equipped ships. The system can process raw acoustic data three times faster than real-time. This detailed analysis permits cataloguing of contact data and provides fleet operators with feedback on CANTASS performance. CANTASS PAS systems are located at the Acoustic Data Analysis Centres (ADACs) in Halifax, NS, and Esquimalt, BC.

The PAS consists of the following hardware components:

  • Sony DIR-1000 tape recorder
  • VME-based system controller and signal processor
  • RAID-based mass memory
  • Four VME-based Operator Workstations (OWs)

Array produced the the Operator Workstation Software (OWS) and the Signal Processing Software (SPS). The OWS displays the processed data in various formats to assist the operators who are analyzing it. The OWS can respond to all user inputs and can retrieve the acoustic display data within one second of receiving a request. It displays data through a high-resolution display processor and a twenty-eight inch greyscale monitor. The display acts as an X-server to the X-Window user interface with scrolling capability.

The SPS processes raw acoustic data collected on High Density Digital Recorder (HDDR) tapes and produces BroadBand (BB), NarrowBand (NB) and Demodulated Noise data at three times real-time. It runs on six, i860-based quad-processor boards, one of which acts as a hot-spare giving the system a fault-tolerance capability. When the SPS detects a faulty quad-board (multiple failures), it will transfer all the processes from the faulty board to the hot spare on-line without affecting overall system performance. Up to six OWs can retrieve and display processed data generated by the SPS.