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The collection of target-radiated noise for passive sonar can be effected by broadband strong jammers, the detection range and accuracy will be reduced as a result of the appearance of jammer suppression area. In this paper, with the help of sonar equation and the theories of broadband array signal processing, the ship-radiated noise and ocean ambient noise are simulated to deduce the detection range of directional passive sonar under strong jammers, the direction of arrival and the output signal of passive sonar are also discussed. Introduction Generally, targets can be detected by passive sonar system through the detection of radiated noise. The receiver for the radiated noise of targets could be covered because of the existence of strong jammers with high power, this will lead to the appearance of jammers suppression area and targets couldn’t be detected by passive sonar in it. The discussion about effect of strong jammers on passive sonar detection often guided by passive sonar equation, and it treats jammers as the background noise of the system, so the jammers suppression area can be deduced by pre-set detect threshold. Since there is no combination of sonar signal processing theory in the discussion, the effect of strong jammers on system output signal waveform and the direction of arrival couldn’t be given specifically. And therefore, a comprehensive and detailed analysis about the effect of strong jammers on passive sonar system couldn’t be presented, which will not meet the needs of actual underwater acoustic antagonizing. In this paper, effect of strong jammers on passive sonar detection is discussed based on the theories of broadband array signal processing and guided by passive sonar equation. The signal-level simulation and analysis is carried out by using simulated ship-radiated noise, ocean ambient noise and jammers signal. As a result, the detection range of directional passive sonar system under strong jammers is deduced, the effect on targets’ signal waveform that system outputs and the estimation of direction of arrival are also discussed. So, a more comprehensive and detailed analysis about the effect of strong jammers on passive sonar system is given with the help of the whole discussion above. Concept of Operations The passive sonar equation that background noise is the major noise is: ( ) SL TL NL DI DT − − − = (1) The normal detection range 0 R that sonar system can reach in different orientation under no jammers situation can be deduced from (1). Under the existence of jammers, the passive sonar equation will be adjusted to: [( ) SL TL NL DI − − − + ( ( ))] i SLi TLi DI DT θ − + = (2) SLi is jammer source level, TLi is the transmission loss of jammer, ( ) i DI θ is the space gain of sonar array for jammer, the ‘+’ here is the combination of sound

Effect of Strong Jammers on Passive Sonar Detection