Accession Number:

ADA252494

Title:

An Implementation of a Fault-Tolerant, Multidirectional, Digital Interpolation Beamformer

Descriptive Note:

Corporate Author:

CHARLES STARK DRAPER LAB INC CAMBRIDGE MA

Personal Author(s):

Report Date:

1992-06-01

Pagination or Media Count:

120.0

Abstract:

In recent years, methods of incorporating fault-tolerance in computer architectures have shifted from the exclusive focus on traditional modular redundancy techniques to include more efficient, analytical means of achieving the same result. Song and Musicus 1990 describe such a method of analytic fault-tolerance by using a statistical test and minimal redundancy to protect linear operations. Aliphas, Wei, and Musicus 1991 in turn developed a hardware prototype to test this method of statistical fault-tolerance. Using this hardware prototype, a multidirectional, digital interpolation sonar beamformer was implemented. Whereas the original prototype used multiple processors performing the same task on different input data, this implementation uses a different architecture whereby the same data is sent to multiple processors performing different tasks. The digital beamformer relaxes the sampling requirement typically required by sampling the incoming waveform at the Nyquist rate and upsampling to form the beam. Implementing the beamformer on the current architecture offered double fault detection and single fault correction capabilities across a range of look angles. In conjunction with previous results, the results of this thesis verify that the same fault detection and correction algorithm may be used for architectures both with processors performing different operations on the same data, and with processors performing the same operation on different data.

Subject Categories:

  • Computer Hardware
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE