KR0126906Y1 - Accelerating sensor interface circuit in sensor part of linear array acoustic wave detector - Google Patents

Abstract

The present invention relates to the acceleration sensor interface circuit of the line array sonar sensor unit for accurately detecting the up, down, left, right vibrations of the water detected by the acceleration sensor of the line array sonar vibration isolation module and transmitting it to the signal processor on the ship Acceleration sensor of the line array sonar sensor unit for detecting the vertical, vertical, left, right vibration of the water detected by the acceleration sensor 65 of the vibration array module of the line array sonar and transmitting it to the signal processing unit on the line In the interface circuit, sensor driving means for supplying a stable voltage for driving the acceleration sensor 65, amplifying means for amplifying the signal sensed by the acceleration sensor 65 to a predetermined level, amplification in the amplifying means A buffer means for removing and amplifying the noise of the signal and a voltage / current converting means for converting the voltage passing through the buffer means into a current; The exact phase, flower, left and right of the vibration to transmit to the signal processing section of the line.

Description

Acceleration sensor interface circuit for line array sonar sensor

1 is an exemplary view showing a sensor unit of a line array sonar.

2 is a block diagram showing the configuration of a line array sonar.

Figure 3 is a block diagram showing an acceleration sensor interface circuit for solving the present invention.

4 is a detailed circuit diagram of FIG.

* Explanation of symbols for main parts of the drawings

10: tail rope assembly 20: array stabilization module

21: direction sensor 22: depth sensor

30: low frequency acoustic module 31, 32: roll sensor

33: hydrophone 34: shear amplifier

35: seawater noise compensation circuit 36: protection circuit

40: signal transmission module 41: depth sensor

42: analog multiplexer 43: automatic gain adjustment amplifier

44: A / D converter 45: direction sensor

50: high-frequency acoustic module 51: hydrophone

52: shear amplifier 53: seawater noise compensation circuit

54: protection circuit 60: vibration isolation module

61: buffer 62: tension

63: fine vibration buffer 64: fine vibration tension

65,66: acceleration sensor 65-1: sensor drive unit

65-2: amplifier 65-3: buffer

65-4: V / I converter 70: towing cable

The present invention relates to a sensor unit of a linear array sonar that is connected to a vessel or a marine structural mall by a tugboat and capable of target search at 360 ° omnidirectional, in particular, the underwater image detected by the acceleration sensor of the vibration detector of the linear array sonar The present invention relates to an acceleration sensor interface circuit of a line array sonar sensor unit for accurately detecting lower, left, and right vibrations and transmitting them to a signal processing unit on a line.

In general, the way the sensor unit of the line array sonar detects the acoustic signal in the water is largely as shown in FIG. 1, the tail rope assembly 10 to finally attenuate the vibration, and the effect of noise due to the slight vibration An array stabilization module 20 for excluding a signal, a low frequency acoustic module 30 for receiving low frequency sound waves, a signal transmission module 40 for converting an input analog signal into a digital signal, and a digital input signal. A signal transmission module 40 for converting the signal, a high frequency acoustic module 50 for receiving a high frequency sound wave signal, a vibration isolating module 60 for attenuating the vibration, and a line array sonar on a ship or offshore structure It is provided with a towing cable 70 for connecting.

The low frequency acoustic module 30 includes a low frequency hydrophone 33 for receiving sound of low frequency underwater, a low frequency shear amplifier 34 for amplifying an electric signal at an output terminal of the low frequency hydrophone 33, and a low frequency The seawater noise compensation circuit 35, which attenuates the noise component, is connected to a cascade.

The high frequency acoustic module 50 has the same configuration as that of the low frequency acoustic module 30, which amplifies an electric signal at the output of the high frequency hydrophone 51 and the high frequency hydrophone 51 for receiving high frequency of seawater. A high frequency shear amplifier 52 and a seawater noise compensation circuit 53 for amplifying high frequency signal components while attenuating noise of low frequency components are cascaded.

The signal transmission module 40 includes an analog multiplexer 42 for receiving analog output signals from the high frequency sound module 50 and the low frequency sound module 30, an automatic gain amplifier amplifier 43 for amplifying the signal, and an analog signal. The A / D converter 44 converts the digital signal into a digital signal, the orientation sensor 45 detecting the towing direction, and the depth sensor 41 detecting the water depth.

The vibration isolation module 60 includes a buffer 61 for buffering vibration, a tension 62 for damping vibrations, and a fine vibration buffer 63 for removing residual vibration components that are not removed from the tension 62, and fine vibrations. And a tension 64 and acceleration sensors 65 and 66.

The array stabilization module 20 is a module having a function of stabilizing the array by transmitting the vibration not attenuated from the vibration isolation module 60 to the depth sensor 22 for detecting the depth and the orientation sensor for detecting the towing direction ( 21).

In addition to the above arrangement, it consists of a tail rope assembly 10 which finally attenuates residual vibration.

The operation of the line array sonar sensor unit configured as described above will be described with reference to FIG.

The low frequency acoustic module 30 is a module for converting low frequency signals among the received acoustic signals into electrical signals. The vibration propagated by the mechanical small and tight action of seawater particles is directly proportional to the product of the square of frequency and amplitude. It causes a change in output to the low-frequency hydrophone 33 in size.

As a result, the piezoelectric element of the low frequency hydrophone 33 generates an electric signal at the output terminal.

The electrical signal induced above shows the effect of signal amplification and noise cancellation in the low frequency shear amplifier 34 at the rear stage.

Low frequency, that is, a signal in which most of the energy exists in the low frequency region, such as sound waves, does not cause a large frequency deviation due to the high frequency components of the same magnitude.

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, resulting in a very low signal to noise ratio (S / N) 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. In the receiver, the signal level is high and the noise can be suppressed to some extent, so the signal to be demodulated should be intentionally changed by extending the low frequency compared to the high frequency.

The alteration of the signal to generate high frequency spreading is called pre-emphasis filtering, and the expansion of low frequency components as compared to high frequency is called de-emphasis.

This increases the signal-to-noise ratio (S / N) at the receiving end.

The pre-emphasis and de-emphasis are collectively referred to as emphasis.

In the low frequency shear amplifier 34, the small signal of the hydrophone 33 is amplified to a size suitable for signal processing.

In general, underwater sound waves are often present in the form of low frequency waves, so that a plurality of low frequency acoustic modules 30 are installed in the sensor unit of the line array sonar for accurate measurement of signals, so that low frequency signals of seawater can be captured. .

Since the noise is also amplified together in the signal, there are not only ambient noise but also the noise factor of the amplifier itself (1 / f noise generated in the low pass filter frequency band, Johnson noise, etc.).

1 / f noise occurs in the low pass band, Johnson noise, shot noise appears in the frequency band (Frequency Modulation: FM) band and evenly distributed in the frequency band, considering the elimination of the amplification circuit (microscopic) By limiting the bandwidth, the noise level is reduced.

In addition to the low frequency acoustic module 30, the operation of the high frequency acoustic module 50 for detecting the high frequency sound wave signal of the seawater is the same as the above method.

Next, in the signal transmission module 40, the acoustic module modulates the high frequency acoustic module 50 signal and the low frequency acoustic module 30 signal in the current form, and modulates the pulse code to digitalize the data. Pulse Code Modulation (PCM).

The pulse code modulation (PCM) is a method of transmitting a signal in sequence of numbers, and sampling and quantizing the signal according to the size and quantizing and leveling the sampled signal. Used.

Looking at the operation of the signal transmission module 40 of the towed line array sonar sensor unit through FIG. 2 is as follows.

When the signals received and amplified by the high frequency sound module 50 and the low frequency sound module 30 are sequentially input to the analog multiplexer 42 to digitally signal, the analog multiplexer 42 automatically gains the received signals sequentially. After the amplitude is amplified by the adjusting amplifier 43, the analog signal in the A / D converter 44 is sampled, quantized, and digitally signaled to a corresponding magnitude according to the magnitude of the amplitude.

Here, the analog signal is sampled and quantized into a corresponding digital signal according to its magnitude, and then digitally signaled.

In addition, the azimuth sensor 45 captures the towing direction, and the depth sensor 41 measures the depth information, respectively, and modulates the pulse code like a sound signal processing route in the signal transmission module 40 so that the digital signal is generated. As described above, the ship is transmitted to the signal processor (not shown).

Next, the vibration isolation module 60 is to attenuate the vibration generated from the towing and the towing cable 120. The vibration is detected by the tension 62 and the micro vibration tension 64 to generate a buffer ( 61) and the vibration damping in the fine vibration buffer 64, each acceleration sensor 65, 66 detects the acceleration during the sensor operation.

In addition, the tail rope assembly 10 stabilizes the arrangement by transmitting the vibrations that are not attenuated in the vibration module of the array stabilization module 20 through the tail rope assembly 10, and finally, the sensor part of the line array sonar finally remains. Prevent vibration

The towed line array sonar sensor unit can collect various data information about the depth of water, azimuth, etc., and can remove noise effect caused by the medium by separating low frequency and high frequency for high quality signal processing of collected information. In other words, defects indicating limitations have arisen in the area of precision detection and detection of large area exploration remote signals.

The present invention provides an acceleration sensor interface circuit of the line array sonar sensor unit for accurately detecting the up, down, left and right vibrations in the water detected by the acceleration sensor of the line array sonar vibration isolation module and transmitting it to the signal processing unit on the line. Has its purpose.

In the present invention, the acceleration sensor interface of the line array sonar sensor unit for accurately detecting the up, down, left, right vibration of the water detected by the acceleration sensor 65 of the line array sonar vibration isolation module and transmitting it to the signal processing unit on the line In the circuit, sensor driving means for supplying a stable voltage for driving the acceleration sensor 65, amplifying means for amplifying the signal sensed by the acceleration sensor 65 to a predetermined level, the signal amplified by the amplifying means It is a well-known feature to provide an interface circuit having a buffer means for removing and amplifying noise for the noise and a voltage / current converting means for converting a voltage passed through the buffer means into a current.

This will be described with reference to the accompanying drawings.

In the circuit for transmitting the vibration of the water detected by the acceleration sensor 65 of the line array sonar vibration isolation module to the signal processing unit on the line, the sensor driver 65 for supplying a stable voltage for driving the acceleration sensor 65. -1), an amplification unit 65-2 for amplifying the signal sensed by the acceleration sensor 65 to a predetermined level, and amplifying by removing noise of the signal amplified by the amplification unit 65-2. A buffer 65-3 and a V / I converter 65-4 for converting the voltage passing through the buffer 65-3 into current are provided.

The sensor driver 65-1 includes a resistor R1 for limiting an input current, a capacitor C1 for removing noise of an input power source Vcc, and a zener diode for supplying an input power source Vcc at a constant voltage ( ZD).

The amplifier 65-2 receives the sensed signal of the acceleration sensor 65 through the resistors R2 and R3 and differentially amplifies the amplifier OP1 and a resistor for determining the amplification ratio of the amplifier OP1. R2) and R4, and a resistor R5 for protecting the output terminal.

The buffer 65-3 includes a resistor R6 and a tone capacitor C2 for filtering out low-frequency noise for the signal amplified by the amplifier OP1, and a resistor for determining the value of the filtered signal. R7) and a capacitor C3, and an amplifier OP2 for receiving and passing a signal determined by the values of the resistors R7 and C3.

The V / I converter 36-4 includes an amplifier OP3 for amplifying a signal input from the buffer 65-3 to a predetermined level, a resistor R10 for determining an amplification ratio of the amplifier OP3, and A capacitor C9, an amplifier OP4 for amplifying and returning the output signal of the amplifier OP3 and outputting it through the resistors R11 and R12, and a resistor for dividing a signal input to the amplifier OP4 ( R8) and R8, and a resistor R13 for keeping the output signal of the amplifier OP4 constant and outputting it to an out put.

Hereinafter, by the accompanying drawings will be described the operation and effect according to the present invention.

FIG. 1 is an exemplary view schematically showing a sensor unit of a line array sonar, FIG. 2 is a block diagram showing a configuration of a line array sonar, and FIG. 3 is a block diagram showing an acceleration sensor interface circuit for solving the present invention. 4 is a detailed circuit diagram of FIG.

Since the sensor part of the line array sonar has already been described in the preceding section of the present invention, the effects of the present invention will be omitted.

The operation of the vibration isolation module 60 of the towed line array sonar sensor unit will be briefly described with reference to FIG. 2.

The vibration isolating module 60 is for attenuating the vibration generated from the towing and the towing cable 120, and detects the vibration generated by the towing by the tension 62 and the micro vibration tension 64 to the buffer 61 and The vibration is buffered in the fine vibration buffer 64, and each of the acceleration sensors 65 and 66 senses acceleration during the operation of the sensor.

Looking at the acceleration sensor 65 to deal with the main bones in the present invention to detect the vibration of the upper, lower, left, right in the water based on 3 to 4 of the present invention as follows.

The power supply Vcc applied to the sensor driver 65-1 is limited to a constant voltage (for example, 5V) through the resistor R1 and charged in the capacitor C1.

When the power supply Vcc is charged to the condenser C1 of the sensor driver 65-1, the condenser C1 starts discharging from this time, and a stable constant voltage is generated by the zener diode ZD, thereby providing an acceleration sensor 65. Is approved.

Acceleration sensor 65 detects the vibration of the water in the up, down, left and right by the voltage supplied stably from the sensor driver 65-1.

The acceleration sensor 65 senses vibrations in the water in the up, down, left and right by the voltage supplied stably from the acceleration sensor 65-1.

The up, down, left and right vibrations of the water sensed by the acceleration sensor 65 are output as a current signal and are input to the amplifier OP1 through the resistors R2 and R3 of the amplifier 65-2. .

The amplifier OP1 determines the amplification rate according to the value determined by the resistors R2 and R4, amplifies the amplifier OP to a predetermined level, and outputs the amplification rate to the buffer 65-2.

The buffer 65-3 filters the low-frequency noise component through the resistor R6 and the capacitor C2 and inputs the signal input from the amplifier OP1 at the front end to the amplifier OP2 through the resistor R7. .

The amplifier OP2 passes the values determined by the resistor R7 and the capacitor C3 as they are and inputs them to the non-inverting terminal (+) of the amplifier OP3 of the V / I converter 65-4.

The voltage inputted to the non-terminal terminal (+) of the amplifier OP3 is inputted after the amplification factor (10 times) is determined by the values of the resistor R10 and the capacitor C9 connected to its inverting terminal (-). The voltage is amplified by 10 times and output as a current value.

Since the signal amplified and output from the amplifier OP3 is divided through the resistors R8 and R9 at the time when it is applied to the resistor R13 and input to the amplifier OP4, the amplifier OP4 amplifies it. Return to the amplifier OP3.

Therefore, the signal amplified by the amplifier OP3 and output as a current value maintains a constant voltage across the resistor R13 at all times to provide a signal for up, down, left, and right vibrations detected by the acceleration sensor 65. It transmits to the signal processing part on board correctly.

As described above, the present invention has the effect of accurately detecting the up, down, left and right vibrations in the water detected by the acceleration sensor of the line array sonar vibration isolation module and transmitting the signal to the signal processor on the line.

Claims (4)

In the circuit for transmitting the vibration of the water detected by the acceleration sensor 65 of the line array sonar vibration isolation module to the signal processor on the line, the sensor driver 65 for supplying a stable voltage for driving the acceleration sensor (65) -1), an amplifier 65-2 for amplifying the signal sensed by the acceleration sensor 65 to a predetermined level, and removing and passing noise for the signal amplified by the amplifier 65-2. And a buffer 65-3 and an V / I converter 65-4 for converting the voltage passing through the buffer 65-3 into a current. Circuit. 2. The sensor driver 65-1 according to claim 1, wherein the sensor driver 65-1 includes a resistor R1 for limiting an input current, a capacitor C1 for removing noise of the input power source Vcc, and a power source Vcc for input voltage. Acceleration sensor interface circuit of the line array sonar sensor unit characterized in that it comprises a zener diode (ZD) to be supplied to. The amplifier OP2 of claim 1, wherein the amplifier 65-2 receives the sensed signal of the acceleration sensor 65 through the resistors R2 and R3 and amplifies the amplifier OP1 and the amplifier OP1. And a resistor (R2) (R4) for determining the rate, and a resistor (R5) for protecting the output stage. The method of claim 1, wherein the buffer (65-3) is a resistor (R6) and condenser (C2) for filtering to remove low-frequency noise for the signal amplified by the amplifier (OP1), and the value of the filtered signal A line array sonar sensor comprising a resistor R7 and a capacitor C3 for determining and an amplifier OP2 for receiving and passing a signal determined by the values of the resistors R7 and C3. Negative acceleration sensor interface circuit.