KR0127320Y1 - Power supply apparatus for sensor part of towed array sonar system - Google Patents

Abstract

The present invention relates to an acoustic sensor unit of a sound detector used to receive information about the location of a sound source, the size of the sound source, and the direction of travel of the sound source by receiving sound waves from the seabed. The present invention relates to a power supply device used to drive a sound module that detects and amplifies a signal, and a signal transmission module that processes a signal received from the sound module. It is a device for removing noise effectively.

Description

Power supply unit of manual towed sound detector

1 is an exemplary configuration block diagram showing an acoustic detector.

2 is a configuration diagram of the power supply unit devised in the present invention.

3 is a configuration of the sensor power supply unit devised in the present invention.

* Explanation of symbols for main parts of the drawings

1: Bridge Diode 10: IAM (Input Attenuator Module)

20,20a, 20b: DC-DC converter

30,30a, 30b: RAM (Ripple Attenuator Module)

90: power supply device 100: ship

110: data processing unit 120: signal processing unit

200: towing cable 300: sound sensor

310: vibration isolation module 311: tension sensor

312: buffer 320: signal transmission module

330: sound module 331: hydrophone

332: preamplifier 333: protection circuit

334 Seawater noise compensation circuit 335,335a Roll sensor

336: test controller 337: depth sensor

338: direction sensor 340: tail rope assembly

The present invention relates to a power supply for driving an acoustic sensor unit of a towed array sonar system (TASS) for detecting the sound of the underwater to detect the exact position of the sound source (type of sound source, the moving speed of the sound source).

In general, the method of detecting the sound waves by the acoustic detector that detects the acoustic signal in the water and the exact location of the sound source is the active sonar method that emits the acoustic energy and receives the energy reflected from the object. For example, there is a passive sonar method for receiving only acoustic energy radiated from other sound sources.

As shown in FIG. 1, the sound detector detects an underwater sound signal, converts it into an electrical analog signal, converts it back into a digital signal, multiplexes it, and transmits the signal to the signal processor 120. And, the towing cable 200 for connecting the vessel or structure and the acoustic sensor unit 300, and the signal processing unit for transmitting the electrical signal received from the acoustic sensor unit 300 to the data processing unit 110 in the vessel 100 And a data processor 110 for classifying, searching, and processing the signal data received from the signal processor 120.

In addition, the acoustic sensor unit 300 includes a vibration isolation module 310 for attenuating initial vibration, a signal transmission module 320 for converting an input analog signal into a digital signal, and transmitting an acoustic signal. A sound module 330, and the tail rope assembly 340 to attenuate the vibration finally.

Hereinafter, the configuration of the acoustic sensor unit 300 will be described in detail with reference to FIG. 2.

The acoustic module 330 is a module that receives sea sound signals and converts them into electrical signals and removes seawater noise flowing through the signals. Hydrophone: 331 (and a preamplifier (Pre-Amp: 332) for amplifying fine signals, a protection circuit (Input Protector: 333) for protecting the preamplifier 332 from overcurrent, and the tilt of the acoustic sensor unit 300) Roll sensor (335,335a) for detecting the load, Sea Noise Correction Amp (334) for compensating for noise due to seawater, and depth sensor (337) for measuring the depth of the acoustic sensor unit 300 ), An orientation sensor 338 for measuring the orientation of the acoustic sensor unit 300, and a test controller 336 for testing the abnormality of the acoustic sensor unit 300. The signal transmission module 320 The acoustic module 330 receives the output signal in parallel and outputs the serial signal. Is an analog mux (not shown), an automatic gain regulator (not shown) that increases the amplitude of the analog signal for digital conversion in a later ADC (not shown), an ADC (not shown) that digitally converts the analog signal, , A mux 60 for multiplexing a digital signal, and a drive (not shown) for driving the signal processing unit 120 of the ship 100 with a constant signal.

In addition, the vibration isolation module 310 is composed of a tension sensor 311 for detecting the tension, and a buffer 312 to attenuate the tension.

Hereinafter, the operation of the acoustic sensor unit 300 having the above configuration will be described in detail with reference to FIG. 2.

Underwater acoustics are propagated by the mechanical coarse action of seawater particles, and the vibration causes a volume change in the hydrophone 331 in a magnitude proportional to the product of the square of the frequency and amplitude, thereby causing the hydrophone 331 to transmit an electrical energy signal. Occurs.

The electrical energy signal is expressed in the form of current and voltage. When impedance matching is performed considering the sensitivity of the hydrophone 331 to the output preamplifier 332, the signal of the hydrophone 331 can be transmitted far.

The preamplifier 332 amplifies the weak signal of the output of the hydrophone 331, and processes the small signal of the hydrophone 331 after an emphasis process to compensate for the attenuation according to the progress of the sound wave. To easily amplify.

The emphasis refers to a pre-emphasis that changes a signal to generate a high frequency spread and a de-emphasis that extends a low frequency component as compared to a high frequency. Signal To Noise Ratio (SNR) is increased.

In more detail, a signal in which most energy exists in a low frequency region such as sound waves does not generate a large frequency deviation due to a high frequency component of the same size.

Therefore, the energy of the signal is not uniformly distributed over the allocated bandwidth, but the energy of the high frequency portion is less distributed, which results in a weak signal-to-noise ratio for the high frequency signal.

Pre-emphasis and de-emphasis methods to overcome these weaknesses have high signal level and noise can be suppressed to some extent in the transmitter, so the signal to be modulated is intentionally extended by high frequency compared to low frequency. In the receiver, the signal level is high and the noise can be suppressed to some extent so that the signal to be demodulated is intentionally changed by extending the low frequency compared to the high frequency.

When the signal is amplified by the preamplifier 332, the noise is also amplified together in the signal, thereby reducing the noise level by limiting the amplification circuit bandwidth of the preamplifier 332 in consideration of elimination of the noise factor itself as well as the surrounding noise. I'm making it.

The amplification element itself includes noise generated by the amplifying element, 1 / f noise, shot noise, and Johnson noise, which occur in the low pass filter frequency band, and 1 / f noise occurs in the low pass band, and Johnson noise, Shot noise is called white noise because it appears above the frequency modulation band and is uniformly distributed in the frequency band.

As the signal processed as described above passes through the sea noise compensation circuit 334, the noise signal in the sea water existing in the low frequency region is blocked, and the attenuated high frequency component signal is compensated and transmitted to the signal transmission module 320.

In addition, the depth sensor 337 and the azimuth sensor 338 of the acoustic module 330 measure azimuth and depth information, which are examples of the acoustic sensor unit 300, and transmit the measured azimuth and depth information to the signal transmission module 320.

The signal transmitted to the signal transmission module 320 through the above process is sequentially multiplexed in an analog mux (not shown), and then in an automatic gain adjuster (not shown) in order to suppress quantization errors occurring in a digital signalization process. The amplitude of the analog signal is increased and the processed signal is digitalized after sampling and quantization in an analog digital converter (ADC).

The digital signal is sequentially multiplexed in a multiplexer, and the drive 70 in the rear stage drives the signal to drive the signal processor 120.

The present invention relates to a device for supplying power to the passive towing type acoustic detector sensor functioning as described above, and converts a high voltage sent from the vessel into a low voltage and also detects a target signal. The object is to provide a power supply that minimizes the noise level.

Hereinafter, the configuration of the present invention will be described with reference to FIG.

The power supply device 90 devised in the present invention is loaded on the bridge diode 1 and the power source to apply the same polarity to the power input terminal of the acoustic sensor unit 300 regardless of the polarity of the power sent from the ship 100. Output IAM (Input Attenuator Module: 10) and +5 volts to protect the power supply 90 from filtering incoming electromagnetic interference (EMI), attenuation of surges, and reverse polarity connections DC-DC converter 20, DC-DC converter 20a for outputting +15 volts, DC-DC converter 20b for outputting -15 volts, and DC-DC converters 20, 20a, Capacitor filters (C1 to C12) for removing the noise carried in 20b), RAM (Ripple Attenuator Module: 30, 30a, 30b) for removing harmonics and switching noise carried on the input voltage, and a signal transmission module Consists of the capacitor (C13 ~ C15) for applying a constant voltage to the 320 and the sound module 330 The.

The operation of the present invention will be described in detail with reference to FIG. 3 as follows.

First, when the power from the ship 100 is input to the power input terminal a with a positive polarity and a negative polarity at the b, two diodes D1 and D3 of the diodes connected to the bridge diode 1 are connected. On conducting, a positive polarity signal is applied to the P (in) terminal of the IAM 10, and a negative polarity signal is connected to the N (in) terminal.

In addition, in the case where the power input terminal a receives a negative polarity signal and b receives a positive polarity signal, two diodes D2 of the diodes connected to the bridge diode 1 ( D4) is energized so that a positive polarity signal is applied to the P (in) terminal of the IAM 10, and a negative polarity signal is connected to the N (in) terminal and applied to the power input terminals a and b. Regardless of the polarity of the power source, a power source having the same polarity is applied to the input terminals P (in) and N (in) of the IAM 10.

The power applied to the IAM 10 through the above process is loaded with a surge component and an electromagnetic wave component so that the IAM (In order to protect the power supply device 90 from the removal and reverse polarity of the components as described above). In step 10) the power signal is filtered.

The power signal filtered through the IAM 10 is converted into magnitudes of +5 volts and ± 15 volts in the plurality of DC-DC converters 20, 20a and 20b, respectively. To do this, capacitor filters C1 to C12 are used.

In general, the most serious noise problem in electronic products is the ripple component flowing into the power stage, which refers to a fairly large AC component pulsating around the DC component.

Therefore, in order to solve the above problem, in the RAMs 30, 30a and 30b, the acoustic sensor unit is operated by removing the harmonics of the input signal and the switching noise component of 20 MHz from the direct current and then charging the capacitors C13 to C15. The signal transmission module 320 and the acoustic module 330 of 300 are supplied with a constant voltage.

Therefore, the power supply device 90 according to the present invention allows the signal transmission module 320 of the acoustic sensor unit 300 and the noise carried in the signal applied to the acoustic module 330 to be able to remove the accurate underwater sound information. It is possible to secure accurate information on the location, size, and direction of the sound source that generates sound waves on the sea floor, thereby ensuring effective defense tactics or attack tactics in response to enemy disturbances or deception tactics. Have

Claims (2)

Signal transmitting module 320 for transmitting the signal of the acoustic module 330 and the sound module 330 to the signal processor 120 of the ship 100 to detect the location, size, direction of movement of the sound source, etc. Bridge diode (1) applying the same polarity to the power input terminal of the acoustic sensor unit (300) irrespective of the power polarity sent from the ship 100 to supply power to the power supply), and filtering and surge of electromagnetic interference IAM 10 to protect the acoustic sensor unit 300 from attenuation of surge, reverse polarity connection, DC-DC converters 20, 20a and 20b to convert voltage magnitude, and noise reduction Having a power supply device 90 including capacitor filters C1 to C12, RAMs 30, 30a, and 30b for removing harmonics, and capacitors C13 to C15 for maintaining a constant voltage. Power supply device of the passive tow-type sound detector sensor characterized in that. 2. The passive diode according to claim 1, wherein the bridge diode (1) has a configuration in which a positive voltage and a negative voltage are applied to a terminal determined irrespective of a change in polarity of an input power source. Power supply unit for tow-type sound detector.