KR101676647B1 - Apparatus for detecting CPA using time synchronization - Google Patents

Abstract

An apparatus for measuring CPA between a measuring body (10), an object to be measured (12) and an auxiliary body (15) Receiving unit 20, a control unit 30 and a power supply unit 40. The transmitting and receiving unit 20 performs transmission and reception of sound waves to the sound wave transmitter 21 and the sound wave receiver 22, The controller 30 performs a measurement processor in a synchronous state between the measuring body 10, the measured body 12, and the assistant body 15.
Accordingly, it is possible to accurately and easily measure the distance and position between the moving object and the stopped object in the water, and to measure the distance and position between the devices at all positions between the two objects. Further, It is possible to reduce the measurement time to 1/2 by reducing it to two stages of transmission and reception.

Description

[0001] The present invention relates to a CPA measuring apparatus using a synchronous method,

The present invention relates to a CPA measuring apparatus, and more particularly, to a CPA measuring apparatus using a synchronous method for measuring a nearest point to a moving object in a submarine or other water in an underwater radiation noise test.

International organizations such as IMO are known to be working to control the requirements for Underwater Radiated Noise_URN, taking into account the impact of noise from merchant ships and offshore plants on underwater organisms. In anticipation of the establishment of these URN standards, ANSI (S12.64) and ISO (17208-1) have established and published standards for the URN measurement method. The most important factor in the test is noise This is a measure of the Closest Point of Approach (CPA) that determines the transmission loss.

However, the faster the ship's speed, the lower the accuracy of the CPA. Therefore, a method for minimizing such errors and losses is required.

Because it is tested using conventional GPS or distance measuring telescope, it is impossible to set accurate reference point according to the shape of the ship. The error is 2/3 of the length of the ship, for example, when the ship is 100m long, 70m. It is estimated that the noise reduction level according to the distance is more than 2dB and the average noise measurement interval is more than 5dB difference. This error is a risk that the builder must accept, and sometimes even a penalty charge is imposed.

According to the following prior art reference 1, a reference device having a plurality of ultrasonic receiving units, a synchronizing signal and a data transmitting unit; A moving object having an ultrasonic transmitter, a synchronizing signal and a data receiver; For each received signal, the position is calculated according to the time value after the generation of the synchronous signal, and is transmitted to the moving object. Accordingly, it is expected that an accurate position calculation can be performed in a large space with a small cost.

In the following prior art document 2, the distance between the first sound wave generating section and the first sound wave generating section is calculated using the sound wave receiving time at which each sound wave of the first sound wave generating section is received by each first sound wave receiving section, The distance of the second sound wave generating unit from the second sound wave receiving unit is calculated using the sound wave receiving time of the sound wave of the generating unit. Accordingly, it is expected that the effect of accurately measuring the position of the underwater robot working underwater by mounting the small scale equipment on the movable structure is expected.

However, according to the above-mentioned prior patent 1, the actual application is not enough due to the lack of detailed technical description, and according to the prior patent 2, it is limited to shorten the measurement time by applying to the underwater radiated noise (URN) test.

1. Korean Patent Publication No. 2005-0001277, "Method for calculating the position of a moving object" (Publication date: January 6, 2005) 2. Korean Patent Registration No. 1408211 entitled "Positioning Apparatus for Underwater Robot" (Published on June 16, 2014)

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems of the related art by providing an accurate CPA from a reference point to a submarine or other moving object using a time synchronization method without simultaneously using conventional sound transmission / And to provide a CPA measurement apparatus using a synchronization method for calculating the CPA.

In order to achieve the above object, the present invention provides an apparatus for measuring CPA between a measuring body, an object to be measured, and an auxiliary body, the apparatus comprising: a transmitter and receiver unit, a control unit, and a power source unit on the object to be measured, The transmitting and receiving unit performs transmission and reception of sound waves to and from a sound wave transmitter and a sound wave receiver, and the control unit performs a measurement process in a synchronized state between the measuring body, the measured body, and the auxiliary body.

In a detailed configuration of the present invention, the control unit includes an atomic clock generator and a synchronization controller.

In a detailed configuration of the present invention, the control unit of the measuring object further includes an operation unit for calculating a distance and a position with respect to the object to be measured.

In this case, the control unit of the measuring body receives the sound waves of the object to be measured and the auxiliary body at the synchronized first time point, and transmits the sound waves to the object to be measured and the auxiliary body at the synchronized second time point.

Meanwhile, the control unit varies the alternating periods of the first and second time points in accordance with the set external factors.

As described above, according to the present invention, it is possible to accurately and easily measure the distance and the position with respect to an object moved or stopped in water, and to measure the distance and position between the devices at all positions between the two.

In addition, by using the time synchronization technique, it is expected that the conventional four-stage operation is simplified to two stages of transmission and reception of sound waves, and the measurement time is reduced to 1/2.

1 is a conceptual diagram showing an overall configuration of a device according to the present invention;
2 is a block diagram showing a main configuration of an apparatus according to the present invention;
3 is a graph showing a comparison between the operation of the present invention and the conventional art

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention proposes an apparatus for measuring CPA between a measuring body (10), an object to be measured (12) and an auxiliary body (15). In Fig. 1, the measuring object 10 is a vessel in the sea, and the object to be measured 12 is exemplified as a submersible in water. The auxiliary body 15 corresponds to a landmark for CPA (Closest Point of Approach) shortest approach point (CPA) measurement. As described above, the CPA measurement that determines the noise transmission loss to distance in the URN measurement is the most important factor.

The present invention is based on a system including the transmitting and receiving unit 20, the control unit 30 and the power supply unit 40 on the measuring body 10, the measured body 12 and the auxiliary body 15 . The transmission and reception unit 20, the control unit 30 and the power supply unit 40 included in the measuring object 10 are referred to as "UNIT 1" and the transmission and reception unit 20 ), The control unit 30 and the power supply unit 40 will be referred to as "UNIT 2 ". The power supply unit 40 is constituted by respective independent batteries.

In addition, according to the present invention, the transceiver 20 performs transmission and reception of sound waves to the sound wave transmitter 21 and the sound wave receiver 22. The sound wave transmitter 21, the sound wave receiver 22, and the transducer 25 provided in the transmission and reception unit 20 are the same category as those employed in the underwater distance measurement apparatus using the conventional sound wave transmission and reception. However, since the conventional apparatus is an active type distance and position measuring system, the transmission and reception of sound waves must be sequentially performed between the measuring body 10 and the measured body 12, In this case, measurement is impossible. In addition, since the measuring object 10 has priority in transmission operation and the measurement object 12 has priority in reception, the characteristics of the two equipments are different.

At this time, a radio wave or an ultrasonic wave transmitted wirelessly in the sound wave path of the transceiver 20 is preferred, but is not necessarily limited thereto.

According to the present invention, the controller 30 performs a measurement processor in a synchronized state between the measuring body 10, the measured body 12, and the assistant body 15. According to the conventional underwater distance measuring method using the sound wave transmission and reception, the sound wave is transmitted from the measuring body 10 to the measuring object 12, the sound receiving object 12 receives the sound wave, Send out sound waves. In order to measure the distance between the measuring object 10 and the object 12 in this conventional manner, a time corresponding to twice the distance is required. On the other hand, the present invention aims at reducing the distance measurement time to 1/2 by synchronizing the processes related to the system clock in UNIT 1 and UNIT 2.

The control unit 30 includes an atomic clock generator 32 and a synchronization controller 35. The atomic clock generator 32 includes a plurality of atomic clock generators 32, The control unit 30 establishes a wireless or wired synchronization network with the synchronization controller 35 of the UNIT 1 and the UNIT 2, and may supplement the GPS (Global Positioning System) satellite. The atomic clock generator 32 may use a cesium atomic oscillator, a rubidium oscillator, or the like. The synchronous controller 35 controls the time synchronization while generating the time signal of the time synchronization and the constant period through the atomic clock generator 32 as an atomic clock.

The control unit 30 of the measurement object 10 further includes an operation unit for calculating a distance and a position with respect to the measured object 12. [ The operation unit is provided in the unit 1, loads a microprocessor and a memory, and performs an operation according to a stored algorithm. In the case of UNIT 2, the synchronization controller 35 sequentially switches (alternates) the sound wave transmission and reception to control the entire board.

At this time, the control unit 30 of the measuring body 10 receives the sound waves of the measured body 12 and the auxiliary body 15 at a synchronized first time point, And the auxiliary body (15). This can be clearly understood through the graphs shown in Figs. 3 (a) and 3 (b).

3 (a), after UNIT 2 has received a sound wave after a time corresponding to the distance between devices after transmission of the sound wave in UNIT 1, and after confirming that the received sound is a signal from UNIT 1, If the signal is correct, UNIT 2 will send the corresponding sound to UNIT 2. UNIT 1 will receive the signal from UNIT 2 and distance and position measurements will be made by calculating the time for the travel of the sound waves.

In other words, UNIT 1, which is located underwater at the start time t1, emits a sound wave of a specific frequency. UNIT 2 receives a sound wave at time t 2 after a time delay corresponding to the distance from UNIT 2 and sends a sound wave toward UNIT 1 at time t 3 after determining whether it is a signal from UNIT 1 through a signal processing process, UNIT 1 receives the sound waves from UNIT 2 and measures the distance and position to UNIT 2. In this way, when the transmission and reception of sound waves for distance and position measurement are complicatedly processed with an active structure, a time delay is incurred in the process of receiving and processing signals in UNIT 2, which causes irregular distance measurement errors.

According to FIG. 3 (b) of the present invention, the apparatuses of UNIT 1 and UNIT 2 are configured to operate in the same cycle. Since UNIT 1 transmits sound waves and UNIT 2 is in sound-receiving mode at the beginning of the cycle, which is repeated at the same time, it calculates the required time of the received signal based on the start point of the cycle. 2 can calculate the distance from UNIT 1 simultaneously with the reception of sound waves. Also, at the beginning of the next cycle, UNIT 2 can send a sound wave and UNIT 1 can operate in receive mode to receive the sound from UNIT 2 and measure the distance to UNIT 2. It is possible to measure the distance between both sea and underwater and it is possible to calculate the distance signal input and output by one sound wave transmission.

In other words, UNIT 1 and UNIT 2 are configured to process based on time signals synchronized in time. Therefore, UNIT 2 is automatically set to the sound reception mode at the time t1 (first time) when the unit 1 transmits sound waves and receives the sound waves at the time t2. At the time t3 (second time) Unit 1 transmits a sound wave and the setting of the sound receiving mode is switched to receive the sound wave at time t4. By setting the UNIT 1 and UNIT 2 to cross the transmission / reception mode according to the time signal of the same period, each device automatically measures the distance and position while processing the transmission and reception mode switching automatically based on the synchronization start point do.

Meanwhile, the control unit 30 varies the alternating periods of the first and second time points in accordance with the set external factors. External factors mean, but are not necessarily limited to factors affecting the propagation speed of sound waves, such as temperature, density, and depth of the sea area. The control unit (30) of the measuring body (10) stores and updates related algorithms, inputs, and outputs on the memory.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

10: measuring body 12:
15: Auxiliary body 20: Transmitting /
21: sound wave transmitter 22: sound wave receiver
25: transducer 30: control unit
32: atomic clock generator 35: synchronous controller
40:

Claims (5)

1. An apparatus for measuring a CPA (Closest Point of Approach) between a measuring body (10), a measured body (12) and an auxiliary body (15)
Each of the transceiving unit 20, the control unit 30 and the power supply unit 40 is provided on the measuring body 10, the measured body 12 and the auxiliary body 15,
The transceiver 20 performs transmission and reception of sound waves to the sound wave transmitter 21 and the sound wave receiver 22,
The control unit 30 performs a measurement process in a synchronized state between the measuring unit 10, the measured object 12, and the auxiliary unit 15,
The control unit 30 of the measuring unit 10 further includes an arithmetic unit for calculating the distance and the position with respect to the measured object 12. The control unit 30 performs signal input /
The control unit 30 of the measuring unit 10 receives the sound waves of the measured object 12 and the auxiliary unit 15 at a first synchronized point in time, Transmits a sound wave to the body 15,
The control unit 30 includes an atomic clock generator 32 and a synchronization controller 35,
Wherein the control unit (30) varies the alternating periods of the first and second time points in a predetermined pattern corresponding to the temperature, density, and depth of the target sea area. delete delete delete delete

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