Accession Number:

AD1113554

Title:

Performance Assessment of Broadband Impulsive Noise Jammers

Descriptive Note:

[Technical Report, Technical Paper]

Corporate Author:

SACLANT UNDERSEA RESEARCH CENTRE LA SPEZIA (ITALY)

Personal Author(s):

Report Date:

2020-01-01

Pagination or Media Count:

10

Abstract:

A noise jammer raises the noise level observed by a threat sonar to degrade the sonars detection performance. In this paper we assess the potential for a specific noise jammer waveform used to countermeasure low frequency active sonars. This waveform is a long duration train of broadband acoustic impulses, each of which has significant low frequency energy. We describe the performance of the impulsive countermeasure on a typical active system processor implementation by comparing experimentally determined receiver operator characteristic curves for the sonar processor with and without jammer energy present. Performance was also determined as a function of pulse intervals. The pulse sequence time series input was synthesized from measurements of high intensity impulses transmitted from a range of approximately 35 Nm in a nominal half-channel environment. Required density functions were obtained from a Monte Carlo simulation involving 100,000 iterations of signal, jammer pulses and noise input. The time average power required for the pulse waveform to achieve a specified detection system degradation was found to be 9 dB more than that of a continuous gaussian noise waveform.

Subject Categories:

  • Acoustic Countermeasures
  • Underwater and Marine Navigation and Guidance

Distribution Statement:

[A, Approved For Public Release]