KR200177992Y1 - Roll digit measuring circuit - Google Patents

Abstract

The present invention is an acoustic countermeasure system capable of receiving a sound wave signal from the seabed and analyzing the position, speed, and size of the sound source, and the acoustic module of the acoustic countermeasure system is initially set by wind, waves, or tidal currents. The present invention relates to a roll value measuring circuit using an inclinometer for detecting a change in position and measuring a roll angle.

Description

Roll value measuring circuit using inclinometer

Figure 1 is an exemplary configuration block diagram showing an acoustic facing system.

2 is a functional block diagram showing in detail the vibration isolation module and the sound module of FIG.

3 is a block diagram of a roll sensor interface unit.

4 is a measuring circuit devised in the present invention.

<Description of the code | symbol about the principal part of drawing>

1a ~ 1f: Capacitor Cell

10: inclinometer 20: multiplexer

30: signal generator 40: microcomputer

50: D / A converter 60: current drive

70: interface unit 80: roll value measurement circuit

100: ship 110: data processing unit

120: signal processor 200: towing cable

300: sound sensor unit 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: orientation sensor

340: tail rope assembly

The present invention is built into the Acoustic Counter Measure, which detects the sound of the seabed and detects the position of the sound source, the speed of movement, etc., and the roll value measuring circuit that detects and measures the degree of distortion of the sound counter system. It is about.

In general, the acoustic countermeasure system that detects the acoustic signal in the water and detects the exact location of the sound source detects the acoustic wave, which is fixed to the vessel to install the acoustic sensor unit on the vessel and subsea to the acoustic sensor installed on the sea floor; There is a towing doll that is connected to the ship by towing cable.

The towed acoustic counter module (Towed Acoustic Counter Module) detects the acoustic signal in the water as shown in FIG. 1 and converts it into an electrical analog signal and converts it back into a digital signal and multiplexed to the signal processor 120 Data processing unit 110 in the ship 100, the acoustic sensor unit 300 to transmit, the towing cable 200 for connecting the vessel and the acoustic sensor unit 300, and the electrical signal received from the acoustic sensor unit 300 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 operation 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, a preamplifier (Pre-Amp: 332) for amplifying a fine signal, a protection circuit (Input Protector: 333) to protect the preamplifier 332 from overcurrent, and the tilt of the acoustic sensor unit 330 Roll sensor (335,336) 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 330 And an orientation sensor 338 for measuring the orientation of the acoustic sensor unit 330.

The hydrophone 331 and the preamplifier 332 have three groups at 120 ° intervals in one package, and 32 groups are connected to one channel because 32 such packages are arranged.

Underwater acoustics are propagated by the mechanical coarse action of seawater particles, and the vibration causes a volume change in the hydrophone 331 with 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 with the output stage 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 low frequency components as compared to high frequencies. (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 cause a large frequency deviation due to a high frequency component 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, 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 limiting the amplification circuit bandwidth of the preamplifier 332 in consideration of the removal of the noise factor itself as well as the surrounding noise. It is decreasing.

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.

An object of the present invention is to provide a roll value measuring circuit that detects the degree of inclination by an external force, such as waves or tides, by using an acoustic counter module used for exploration on the sea floor.

The measuring circuit devised in the present invention is described with reference to FIG. 3 as follows.

Signal of the inclinometer 10 by the control signal of the micrometer 40 of the rear end and the inclinometer 10 for changing the capacitance in accordance with the output value of the roll sensor (335,335a) for detecting the distortion of the acoustic sensor unit 300 Multiplexer 20 selectively connecting the signal generator 30 to the signal generator 30, a signal generator 30 generating a pulse having a different frequency according to the capacitance change of the inclinometer 10, and an output from the signal generator 30. The microcomputer 40 which calculates a roll value based on the obtained signal as the basic data constitutes a roll value measuring circuit block 80, and the D / A converter 50 converts the digital signal of the microcomputer 40 into an analog signal. And a current drive 60 for converting a voltage value into a current form. The detailed circuit configuration will be described with reference to FIG.

FIG. 4 is a detailed circuit diagram of the block diagram illustrated in FIG. 3, and a plurality of capacitor cells 1a to 1f for detecting a roll value are provided on the front and rear surfaces of the roll sensors 335 and 335a installed inside the inclinometer 10. Referring to FIG. The multiplexer 20 includes terminals a to f connected to the output lines of the roll sensors 335 and 335a, terminals X7 to X9 connected to the rear-end microcomputer 40 control signal, and processed signals. Output terminal X2 for outputting the signal, terminals X1, X3 to X6 which are signal grounded, and a power supply terminal V. The signal generator 30 includes power terminals U1 to U2 connected to a power source, terminals U3 and U8 connected to an output of the multiplexer 20, and an output terminal for outputting a signal from the signal generator 30. (4), the terminal U5 for signal ground, the terminal U6 to which the capacitor C1 for removing high frequency noise is connected, and the terminal U8 to which the power supply voltage is divided and input.

The microcomputer 40 includes power supply terminals P6 to P7, terminals P4 to P5 to which clock pulses are applied, a reset terminal RESET having a function of resetting the microcomputer 40, and a signal generator 30. Terminal (U0) to which the output of is applied, and terminals P1 to P3 for outputting the control signal to the multiplexer 20.

In addition, capacitors C1 and C11 for removing high frequency noise and resistors R9 to R10 for dividing voltages are connected to the signal generator 30, and a blocking capacitor C8 around the microcomputer 40. ), A capacitor C9 to C10 for removing noise, and a resistor R8 are connected between the reset terminal and the signal ground.

Hereinafter, the operation of the present invention will be described in detail with reference to FIG.

The acoustic sensor unit 300 of the acoustic countermeasure system installed on the sea floor for underwater sound wave detection may deviate from the initial installation position when the sea surface is inclined by wind, waves, or tidal flow.

In order to prevent the acoustic countermeasure system from capturing accurate information due to the above causes, the sensor 120 is detected using the roll sensors 335 and 335a to correct the changed position again. It is necessary to do it.

Accordingly, the present invention relates to a roll value measuring circuit that receives a signal output from the roll sensors 335 and 335a and performs signal processing to achieve the above function.

The roll sensors 335 and 335a of the inclinometer 10 are combinations of capacitor cells 1a to 1f including dielectrics, and capacitances of the cells are as follows.

C: capacitance

∈: dielectric

A: plate area

d: plate spacing

When the acoustic module 330 is inclined by the outside, the dielectrics inside the capacitor cells 1a to 1f input different capacitances to the multiplexer 20. In the multiplexer 20, when the capacitor cell 1a to 1f signals are selected by the control signal from the microcomputer 40, the selected signals are input to the terminal U9 of the signal generator 30 through the output terminal X2. In the output terminal U4 of the signal generator 30, when a pulse according to the following expression is input to the microcomputer 40 terminal T0, a plurality of frequency values are compared and analyzed to estimate an angle.

f: pulse frequency

R9, R10: resistance

C11: Capacitor

The microcomputer 40 counts the pulse inputted from the signal generator 30 by a clock pulse having an oscillation frequency of 1.44 MHz for a predetermined time, calculates a roll value within a range of 0 ° to 360 °, and then ends with a 12-bit digital signal. The D / A converter 50 transmits the data in parallel.

The rear stage D / A converter 50 converts a parallel digital value composed of 12 bits into an analog value within a range of -5 volts to +5 volts, and transmits the analog value to the current stage 60 of the rear stage.

The current drive 60 of the rear stage converts the signal received in the form of voltage into a signal in the form of current for high speed transmission of the signal.

The signals of the roll sensors 335 and 335a which have undergone the above process are converted into a rolling value in the range of 0 ° to 360 ° to be matched with the range of -5V to + 5V, and then converted into a signal of -5mA to + 5mA. The final output from the drive 60.

Therefore, the present invention detects that the acoustic installation system used for the sound wave detection purposes of the seabed changes the initial installation position due to external wind, waves, birds, etc., so that the acoustic defense system can be effectively used for establishing defense tactics or attack tactics. Has the effect of contributing to

Claims (4)

In the acoustic countermeasure system for receiving a subsea sound wave to grasp the position of the sound source, or to detect the moving speed of the sound source, the size of the sound source, and the like, the roll sensors 335 and 335a for detecting the inclination of the acoustic sensor unit 300 and And a roll value measuring circuit block (80) for processing said signal. 2. The roll value measuring circuit block (80) according to claim 1, wherein the roll value measuring circuit block (80) includes an inclinometer (10) for converting capacitance in accordance with a roll value, a multiplexer (20) for selectively taking an output line of the inclinometer (10), and the capacitance change described above. The analog signal generator 30 generates a pulse having a different frequency, the microcomputer 40 calculates a roll value from the signal output from the signal generator 30, and a parallel digital value of 12 bits. A roll value measuring circuit using an inclinometer, comprising a D / A converter (50) for converting the value into a value, and a current drive (70) for high-speed transmission. 3. A value measuring circuit according to claim 2, characterized by comprising an inclinometer (10) for converting a distortion signal detected by the roll sensors (335, 335a) into capacitance. 3. The roll value measuring circuit according to claim 2, further comprising a signal generator (30) which is outputted by changing a pulse frequency according to a change in capacitance of the inclinometer (10).