The Simulation Design For Single Beam Depth-measuring Apparatus

Single beam depth-measuring apparatus is underwater acoustic field commonly usednavigation equipment, often used for the measurement of water depth, shipping, terrain andocean engineering surveying and mapping to have the important meaning. Single beamdepth-measuring apparatus is a relatively high precision sounding sonar, it is a use of soundimpulses from launch target interface to return to the echo of the distance parametermeasurement instrument.By the1980s, sounders from traditional mimic to digital and intelligent, with simulationmodels in the inherent defect and also with many other advantages, such as the complexsignal processing technology, it can improve system testing ability. Because technology,technical level, our country and western developed countries still exist certain gap existsgenerally poor anti-jamming performance and low degree of automation. In the meanwhile,the single beam depth-measuring apparatus as an underwater sound equipment equipment,underwater complex conditions and installation by the influence of the platform, especiallythe sound field of the ideal nature environment, greatly limits the equipment reliability andstability.In the domestic and foreign to depth-measuring apparatus is common, related technicaldocument, material, many papers, but a systematic introduction of literature sounders designopposite less, This paper is the main task of the single beam sounders system simulationdesign. In the background noise as the main interference, the sound system, launch system,the receiving system, process control system are analyzed, and the main indexes, this papersummarizes the inference establish a set of simplified single beam sounders simulation model.Sound system of single beam first through the equivalent circuit diagram method on thecompound bar transducer longitudinal vibration oscillator design, use of optimum design andredundancy design method of the vibrator sound performance calculation theory, and then ofthe disk array transducer arrays of the piston, acoustic performance simulation, evaluation; Ina transmission system using sound level calculate formula introduced the method of powerlaunch, analysis, discusses the pulse width of the wide launch letter signal can’t less than thetransducer transient time the basic principle, also consider factors such as restricting the sizeof the water requirements. The receiving system from each other in the underwater acousticlearn to the point of view of principle, the transducer launch to calculate response sensitivityreceivers, which in turn on the output echo signal receiving transducer scope, the echo of the receiver input signal range, a receiver gain, dynamic range, the noise of the calculation of thereceiver; In signal detection module design first introduced some common signal processingmethod and its effects, then introduces the calculating method of the filter, raises the conceptof matched filter, summarizes the main characteristics of matched filter, and through theenvelope matched filter and new matched filter of the simulation analysis comparison, onsingle beam sounders signal processing is a kind of improved matched filter method.This article through concrete cases and the design requirements, the completion of thesingle beam sounders simulation design. Sound system of the compressional vibrationtransducer compound bar type oscillator and base the array into battle simulation modeldesign, which got the transducer frequency response curve and receive launch sensitivitycurve launch response curve, through calculation and sound source array209.7dB magnitude;In a transmission system launch pulse width values letter respectively0.001~0.008S, launchfor59W power; The receiving system receiver requirements maximum total gain84dB,receiver theory the minimum total gain-21dB, circuit noise is the1μ V, receiving sensitivityfor190.5dB. Control processing system is according to the best matching filter for thecollected signal simulation processing, get the detailed data processing rendering, to a certainextent, the rationality of the model is proved.