第1章声纳及声纳方程

Sonar—SOSOundNANAvigationandRRanging1.2.3.„SL„DIT„TL„TS„TL„DIR„NL„RL„DT„SL„TL„DIR„NL„DT10lg10==rIISLSLNDDTIIDIlg10=1.2.DIT1.2.3.Pa(W)()214mWPIarπ==77.170lg10+=aPSLTaDIPSL++=77.170lg10PaDIT1030dBSL210240dBrIITL1lg10=1lg10==rirIITSQQCCIr1mPP1.2.NL0lg10IINLN=IN1Hz⎟⎟⎠⎞⎜⎜⎝⎛=0lg10IIRLIlg10=RDIR∫=Ω=ππ44iiNmIdImRR()()∫∫Ω=Ω=ππϕθϕθ44,,dbmIdbImRiiD()ϕθ,bR()⎟⎟⎠⎞⎜⎜⎝⎛Ω==∫πϕθπ4,4lg10lg10dbRRDIDNRR(SNRSNR)lg10=DT1.2.3.SL-2TL+TSNL-DISL-2TL+TS-NL-DISL-2TL+TS-NL-DIDT2TLSL-2TL+TS-RLDT••TS•SL-TL-NL-DIDTSLSL-2TL+TSSL-NL-DINL-DI+DTRL+DTSL-2TL+TS-NL-DI+DTSL-NL-DI+DTTS=0••—DITL••nrRRrRRIIIrnRR′nRR′