Abstract
Sound navigation and ranging (SONAR) systems detect a target in the front direction by using acoustic signals. A switching-type power conversion system is used to improve power efficiency, and an impedance matching circuit is used to decrease reactive power. A low-pass filter is used to improve the quality of acoustic signals. To achieve the desired voltage level for a SONAR transducer, a transformer is connected in series with a low-pass filter. In conventional design methods, design value errors occur because the components are designed independently and later combined. Moreover, if parameters that considerably impact operating characteristics are ignored in the design process, these errors will increase. Hence, time and cost losses are incurred during refabrication because operational characteristics differ from design values. To solve this problem, this study proposes the simultaneous design of a low-pass filter and impedance matching circuit, which includes critical design parameters, utilizing the particle swarm optimization algorithm. Moreover, conventional design methods were examined, and the superiority of the proposed design method to conventional methods was verified through analyses and experiments in terms of overall impedance phase and filter blocking characteristics.
Highlights
The acoustic receiver/transmitter system of a sound navigation and ranging (SONAR) system comprises the following: (1) A receiver/transmitter device comprising a transmitter beam former and receiver beam former, (2) an acoustic converter device that converts electrical signals generated by the receiver/transmitter device into acoustic signals, and converts acoustic signals that echo back from the target into electrical signals, and (3) a signal processer and detector that processes the target information by extracting it from the received signals and determines whether detection has occurred
The quality of the acoustic signal is determined by the harmonic distortion of the voltage supplied to the SONAR transducer and improves as it approaches a pure sine wave
Errors can occur owing to the use of inaccurate properties. Another is the Butterworth–Van Dyke (BVD) model [3] that is based on measurement of the impedance characteristics of a SONAR transducer in a water tank, which has an environment similar to a real operating environment
Summary
The acoustic receiver/transmitter system of a sound navigation and ranging (SONAR) system comprises the following: (1) A receiver/transmitter device comprising a transmitter beam former and receiver beam former, (2) an acoustic converter device that converts electrical signals generated by the receiver/transmitter device into acoustic signals, and converts acoustic signals that echo back from the target into electrical signals, and (3) a signal processer and detector that processes the target information by extracting it from the received signals and determines whether detection has occurred. The voltage produced by an inverter that uses pulse width modulation (PWM) is produced in pulse form that has the same mean value as the source sine-wave voltage If this pulse-form voltage is connected directly to a SONAR transducer, it causes a high charging and discharging current, owing to the characteristics of the transducer that are electrically similar to those of the capacitor, which damages the SONAR transducer. The SONAR transducer requires large reactive power in addition to the active power used to generate the acoustic signal. In terms of the wiring, the increase in power causes an increase in the volume occupied by the winding owing to an increase in the diameter of the wire For this reason, it is useful to design an impedance matching circuit that can cancel large reactance in SONAR transducers. The SONAR transducer power system needs to simultaneously use a low-pass filter and an impedance matching circuit
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