Transcription of 1 Introduction to Sonar - MIT OpenCourseWare
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1 Introduction to Sonar - MIT OpenCourseWare
1 Introduction TO SONAR11 Introduction to SonarrangeabsorptionDITLSLDTNLP assive Sonar EquationSL TL (NL DI)=DTActive Sonar EquationRLSL*IcebergTLTSNLDIDTNL DISL 2TL+TS (RL)=DT1 Introduction TO SONAR2 *SLTLNLUSADTDIH awaiiTomographySL TL (NL DI)=DTParameter definitions: SL = Source Level TL = Transmission Loss NL = Noise Level DI = Directivity Index RL = Reverberation Level TS = Target Strength DT = Detection Threshold1 Introduction TO SONAR3 Summary of array formulasSource Level SL = 10 logI= 10 logpp22(general)Irefref SL = 171 + 10 logP(omni) SL = 171 + 10 logP+ DI(directional)Directivity Index DI = 10 log(ID)(general)IOID= directional intensity (measured at center of beam)IO= omnidirectional intensity(same source power radiated equally in all directions) DI = 10 log(2 L)(line array) DI = 10 log(( D )(disc array) )2) = 20 log( D DI = 10 log(4 LxLy)(rect. array) 23-dB Beamwidth 3dB 3dB= deg.
height of the first side-lobe is 13 dB less than the peak of the main lobe. ... 1 INTRODUCTION TO SONAR 8 Steered Line Array Recall importance of phase: • Spatial phase: kzsinθ = 2
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