KR20110007882A - System and method for measuring waves - Google Patents

Abstract

PURPOSE: A wave measuring system and a method thereof are provided to measure the wave even in the period of precipitation. CONSTITUTION: A radar(30) emits the radar transmission wave to the surface of the sea. The radar receives the reflected wave reflected by the surface of the sea. A measuring device(50) extracts the precipitation reflection component in case of being reflected by precipitation.

Description

Blue measurement system and method {SYSTEM AND METHOD FOR MEASURING WAVES}

The present invention relates to a wave measurement system, and more particularly, to a wave measurement system and method for measuring a wave using a radar.

In general, blue waves are windfalls caused by wind blowing on sea level or surface, and wind waves generated in one sea area decay to other seas without wind. Blue has sharp floors (tops of soaring waves when it is waves), and the spacing between waves is relatively short, but the val- ule has rounded floors and long spacing. In addition, in the open seas, the two show a complex sea level, and the elements that represent the blue character include digging (the height from the trough of the wave to the floor), and the cycle (from one point to the next). Time), external wavelength, wave pressure, wave velocity, and wave direction.

These waves are very important environmental factors for marine vehicles and offshore structures, and the waves have been measured for a long time in order to calculate stability, scale of system operation, and calculation of design criteria.

Conventional wave measurement is mainly performed by the neck side, and the development of negative or vertical water displacement measurement system using an acceleration sensor or an ultrasonic sensor has been developed by the development of measurement-related technology.

Such a conventional wave measuring system is characterized by measuring the surface displacement in a fixed position, has a disadvantage that can not be applied when the position is continuously changed, such as a ship. In addition, the conventional wave measurement system is required to maintain the equipment and the probability of loss due to bad weather or theft is likely to occur.

For this reason, the wave measurement on ships is mainly based on visual observation. However, the reliability of the observations depends on the observer's proficiency and the difficulty of night observation. Accordingly, the wave measurement system has been steadily developed for use in ships, and in recent years, a wave measurement system using a navigation radar has been widely applied.

However, in the case of a rain measurement system using a radar, there is a problem that the wave cannot be measured accurately due to scattering of radar radio waves due to rainfall.

The present invention provides a wave measurement system and method that can measure the wave even in the rain using a radar.

In addition, the present invention provides a wave measurement system and method that can measure the blue wave by compensating for reflection and attenuation caused by rainfall.

According to one aspect of the present invention, a system for measuring blue waves during rainfall is provided.

According to an embodiment of the present invention, a radar for emitting a radar transmission wave to the surface of the sea, the radar for receiving the radar reflected wave reflected by the surface; And a measurement apparatus for extracting a rain reflection component reflected by the rain from the radar reflected waves, setting a surface reflection wave using the radar reflection wave and the rainfall reflection component, and determining the blue wave using the surface reflection wave. A blue wave measurement system is provided.

The radar emits a radar transmission wave to a fixed structure when there is no rainfall, receives a structure reflection wave reflected by the fixed structure, and receives the radar transmission wave to the fixed structure when there is rainfall. It emits, and receives the structure rainfall reflected wave reflected by the fixed structure.

The measurement apparatus extracts the rainfall reflection component and the rainfall attenuation signal from the radar reflected wave using the structure reflection wave and the structure rainfall reflection wave, and uses the radar reflection wave, the rainfall reflection component, and the rainfall attenuation signal. The surface reflection wave is set.

Here, the structure reflection wave may be an average value of the structure reflection wave periodically received from the radar, and the structure rainfall reflection wave may be an average value of the structure rain reflection wave periodically transmitted from the radar.

In addition, the measurement device, the extraction unit for extracting the rainfall reflection component from the radar reflected wave; A setting unit configured to set the surface reflection wave using the radar reflection wave and the rainfall reflection component; And a determination unit determining the blue wave using the surface reflected wave.

The measurement apparatus may extract the rainfall reflection component by using the rainfall received from the rainfall measurement apparatus in the radar reflected wave.

In addition, according to another aspect of the present invention, there is provided a method of measuring a blue wave in a rain measuring system.

According to an embodiment of the present invention, in a method for measuring a blue wave at a rain, the blue measuring system emits a radar transmission wave to the sea surface through the radar of the blue measuring system, and reflects the radar reflected wave reflected by the sea surface. Receiving; Extracting a rain reflection component reflected by the rainfall from the radar reflected wave; Setting a surface reflected wave using the radar reflected wave and the rainfall reflecting component; And determining a blue wave using the surface reflected wave.

In addition, the blue measurement method, before the step of extracting the rain reflection component reflected by the rain from the radar reflected wave, in the absence of the rain to launch the radar transmission wave to the fixed structure, and is reflected by the fixed structure Receiving a structure echo; And firing a radar transmission wave to the fixed structure in the case of rainfall, and receiving the structure rainfall reflected wave reflected by the fixed structure.

The extracting of the rainfall reflecting component reflected by the rain from the radar reflected wave may include extracting the rainfall reflecting component and the rainfall attenuation signal from the radar reflected wave using the structure reflected wave and the structure rainfall reflecting wave. .

Here, the structure reflection wave may be an average value of the structure reflection waves periodically received, and the structure rainfall reflection wave may be an average value of the structure rainfall reflection waves periodically received.

The setting of the surface reflection wave by using the radar reflection wave and the rainfall reflection component may include setting the surface reflection wave by using the radar reflection wave, the rainfall reflection component and the rainfall attenuation signal.

On the other hand, extracting the rain reflection component reflected by the rain from the radar reflected wave, the step of measuring the rainfall; And extracting the rainfall reflection component from the radar reflected wave using the rainfall.

The wave measurement system and method according to the present invention has an effect of measuring the wave even in the rain using a radar.

In addition, the wave measurement system and method according to the present invention has an effect that can compensate for reflection and attenuation due to rainfall.

In addition, the blue measurement system and method according to the present invention has the effect of measuring the blue wave using the reflected wave reflected by the sea surface.

Hereinafter, embodiments of the blue measurement system and method according to the present invention will be described in detail with reference to the accompanying drawings, in the following description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals and Duplicate explanations will be omitted.

The blue measurement system according to an embodiment of the present invention will be described with reference to FIG. 1. 1 is a block diagram illustrating a wave measurement system according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the blue measurement system 100 includes a radar 30 and a measurement device 50.

The radar 30 emits a transmission wave to a sea obstacle (for example, a marine structure, etc.), another ship, a coast, and the like and detects a target by using the reflected reflection wave. In addition, the radar 30 emits a transmission wave to the surface of the sea to measure the blue and receives the reflected wave reflected from the surface of the sea. On the other hand, the radar 30 may be an X-band radar 30 (X-Band Radar).

The radar 30 includes a rain reflection component 320 that is reflected by the rainfall and a surface reflection wave 340 that is reflected by the sea surface when the transmission wave is emitted to the sea surface when there is a rain as shown in FIG. 2. Receive echoes. Specifically, as shown in FIG. 3, when the radar 30 emits a radar transmission wave to the sea surface, the rain reflection component scattered by the rain is received by the radar 30 and attenuated by the scattering of the rain 335. The radar transmission wave 310 is reflected by the sea surface. Then, the surface reflection wave 340 is attenuated 355 again by rainfall, and the radar reflection wave 360 including the attenuated surface reflection wave 340 is received by the radar 30. At this time, the radar reflected wave 360 also includes a surface rainfall reflection component 345 that is reflected to the surface by the rainfall. However, since the surface rainfall reflection component 345 is small, it is determined that it is not present.

The radar 30 emits first and second radar transmission waves to each of the two fixed structures in the absence of rainfall, and receives the first and second structure reflected waves reflected by each of the two fixed structures. In addition, the radar 30 emits the first and second radar transmission waves to each of the two fixed structures in case of rainfall, and emits the first and second structure rainfall reflected waves reflected by each of the two fixed structures. Receive. At this time, the two structures are at the same distance from the radar 30.

The measuring apparatus 50 controls the radar 30 installed in the ship. The measurement apparatus 50 extracts the rainfall reflection component from the radar reflection wave, sets the surface reflection wave using the rainfall reflection component, and determines the blue wave using the surface reflection wave. To this end, the measurement device 50 includes a communication unit 510, an input unit 520, a control unit 530, an extraction unit 540, a setting unit 550, a determination unit 560, a display unit 570, and a storage unit ( 580).

The communication unit 510 is electrically connected to the radar 30. In this case, the communication unit 510 may be connected to the radar 30 through a local area network (LAN). The communication unit 510 receives the first and second structure reflected waves, the first and second structure rainfall reflected waves and the radar reflected waves from the radar 30. The communication unit 510 transmits the structure radar transmission wave transmission start signal and the surface radar transmission wave transmission start signal to the radar 30.

The input unit 520 is a means for receiving numbers and letters from the user. The input unit 520 may receive a time value from the user. Here, the time value is the time to launch the radar transmission wave from the radar 30 to the fixed structure. The input unit 520 provides the input time value to the controller 530. The input unit 520 may be implemented in a manner such as a keyboard, a keypad, and a touch screen.

The control unit 530 includes a communication unit 510, an input unit 520, an extraction unit 540, a setting unit 550, a determination unit 560, a display unit 570, and a storage unit 580 to measure blue. The component of the measurement apparatus 50 is controlled. The controller 530 generates a surface radar transmission wave transmission start signal to emit a transmission wave from the radar 30 to the surface, and generates a structure radar transmission wave transmission start signal to emit a transmission wave to the structure. The controller 530 periodically sets a time value to control to emit a transmission wave to the structure. The controller 530 may set a time value received from the user through the input unit 520, and set the time value using a preset algorithm (eg, a program). The controller 530 may transmit the structure radar transmission wave transmission start signal to the radar 30 for each set time value. In addition, the controller 530 displays the blue color through the display unit 570 using the surface reflected wave set by the setting unit 550.

The extraction unit 540 extracts the rain reflection component from the radar reflected wave. In detail, the extractor 540 extracts the rainfall reflection component and the rainfall attenuation signal by using the first and second structure reflected waves and the first and second structure rainfall reflected waves transmitted from the radar reflected wave through the communication unit 510. Here, the rainfall reflection component is a reflection wave in which the radar transmission wave is reflected by the rain, and the rainfall attenuation signal is a signal in which the radar transmission wave is attenuated by the rain. In addition, the extractor 540 obtains the average of each of the first and second structure reflected waves and the first and second structure rainfall reflected waves that are periodically transmitted to obtain the first and second structure reflected waves and the first and second structure rainfall reflected waves. Can be set. The extraction unit 540 extracts the rain reflection component using the first and second structure reflected waves and the first and second structure rainfall reflected waves, which are average values, and the first and second structure reflected waves and the first and second structure rainfall. It can be extracted more accurately than when using the reflected wave.

The setting unit 550 sets the surface reflection wave using the radar reflection wave and the rainfall reflection component. That is, the setting unit 550 sets the surface reflection wave included in the radar reflection wave using the rainfall reflection component and the rainfall attenuation signal.

The determination unit 560 determines the blue wave using the surface reflection wave set by the setting unit 550. Accordingly, the blue measurement system 100 may determine the blue wave by compensating for the signal reflected or attenuated by the rainfall.

The display unit 570 displays the blue color using the surface reflected wave under the control of the controller 530. The display unit 570 displays a user interface (UI) to receive data from the user. The display unit 570 may display an error occurrence item when an error occurs in the communication unit 510, the input unit 520, the control unit 530, the extractor 540, the setting unit 550, and the determination unit 560. . Accordingly, the user may check the error occurrence displayed through the display unit 570 and replace the error occurrence.

The storage unit 580 stores data necessary for the measurement device 50 and data generated by the measurement device 50. In detail, the storage unit 580 may store the radar reflected wave, the structure reflected wave, and the structure rainfall reflected wave received from the radar 30, and may store the rainfall reflection component and the rainfall attenuation signal extracted by the extractor 540. The storage unit 580 may store the surface reflected waves set by the setting unit 550.

The storage unit 580 provides necessary data at the request of the controller 530, the extractor 540, the setter 550, and the determiner 560. The storage unit 580 may include, for example, a read only memory (ROM), a random access memory (RAM), a flash memory, and the like.

Although the measurement device 50 controls the radar 30 as an example, the present invention is not limited thereto, and the radar 30 may be controlled using a device that controls the radar 30 separate from the measurement device 50. Can be.

A method of measuring blue according to an embodiment of the present invention will be described with reference to FIG. 4. 4 is a flowchart illustrating a wave measurement method according to an embodiment of the present invention.

Referring to FIG. 4, when there is no rainfall, the measurement apparatus 50 transmits the structure radar transmission wave transmission start signal to the radar 30 (S211). Specifically, the control unit 530 of the measurement device 50 generates a structure radar transmission wave transmission start signal to emit a transmission wave to the structure. The communication unit 510 transmits the structure radar transmission wave transmission start signal generated by the control unit 530 to the radar 30.

The radar 30 emits a radar transmission wave to the structure (S213). That is, when the radar 30 receives the structure radar transmission wave transmission start signal from the measurement device 50, the radar 30 emits the first and second radar transmission waves to each of the two fixed structures located at the same distance.

The radar 30 receives the structure reflected wave reflected from the structure (S215). In other words, the radar 30 receives the first and second structure reflected waves reflected from each of the two fixed structures.

The radar 30 transmits the received first and second structure reflected waves to the communication unit 510 of the measurement device 50 (S217).

On the other hand, the control unit 530 of the measuring device 50 transmits the structure radar transmission wave transmission start signal to the radar 30 through the communication unit 510 for each set time value. When the radar 30 receives a structure radar transmission wave transmission start signal for each time value, the radar 30 emits a radar transmission wave and receives the structure reflection wave. That is, when the control unit 530 transmits the structure radar transmission wave transmission start signal to the radar 30 through the communication unit 510 at the set time value, the radar 30 repeats the step S217 in step S213.

The controller 530 of the measuring device 50 transmits the structure radar transmission wave transmission start signal to the radar 30 through the communication unit 510 in the case of rainfall (S219).

When the radar 30 receives the structure radar transmission wave transmission start signal, the radar 30 launches each of the first and second radar transmission waves to each of the two fixed structures (S221). At this time, the two fixed structures are located at the same distance from the radar 30.

The radar 30 receives the first and second structure rainfall reflected waves reflected from each of the two fixed structures (S223).

The radar 30 transmits the structure rainfall reflected wave to the communication unit 510 of the measurement device 50 (S225).

On the other hand, the control unit 530 of the measuring device 50 transmits the structure radar transmission wave transmission start signal to the radar 30 through the communication unit 510 for each set time value. When the radar 30 receives the structure radar transmission wave transmission start signal for each time value, the radar 30 repeats the step S225.

The measurement apparatus 50 transmits a surface radar transmission wave transmission start signal to the radar 30 (S227). In other words, the control unit 530 of the measuring device 50 generates the surface radar transmission wave transmission start signal to launch the transmission wave on the surface by the radar 30. The communication unit 510 transmits the radar transmission wave transmission start signal to the radar 30 under the control of the control unit 530.

When the radar 30 receives the sea level radar transmission wave transmission start signal from the measurement device 50, the radar 30 determines the sea level radar transmission wave transmission start signal and launches the radar transmission wave to the sea level (S229).

The radar 30 receives the radar reflected wave (S231). The radar 30 receives radar reflected waves reflected from the sea surface and attenuated and reflected by rainfall.

The radar 30 transmits the radar reflected wave to the communication unit 510 of the measurement device 50 (S233).

The measurement apparatus 50 extracts the rainfall reflection component and the rainfall attenuation signal from the radar reflected waves (S235). That is, the extraction unit 540 of the measurement device 50 may define the radar reflected wave as shown in [Equation 1] to extract the rainfall reflection component and the rainfall attenuation signal.

[Equation 1]

Where P _total is the radar reflected wave, P _rain is the rainfall reflecting component, and P _sea is the surface reflecting wave. A _rain is the rate at which radar transmissions traveling by distance R are attenuated by rainfall (rainfall attenuation) and are a function of rainfall, distance, and frequency of propagation. The reason A _rain is set to square is because the radar transmit wave attenuates during round trip.

In addition, the extractor 540 may re-define Equation 1 to Equation 2 using the first and second structure reflected waves and the first and second structure rainfall reflected waves.

[Equation 2]

Here, P _r1 and P _r2 represent first and second structure rainfall reflected waves, and P _t1 and P _t2 represent first and second structure reflected waves. P _rain1 and P _rain2 representing the reflections from the rain are the same values for two fixed structures located at the same distance from the radar 30 (P _rain1 = P _rain2 ). A _rain1 and A _rain2 representing the attenuation rate due to rainfall are the same values for two fixed structures located at the same distance from the radar 30 (A _rain1 = A _rain2 ).

Accordingly, the extraction unit 540 substitutes the first and second structure rain reflection waves received from the radar 30 into P _r1 and P _r2 in Equation 2, and the first and second structure reflection waves are converted into P _t1 and P 2. Substituting P _t2 , P _rain which is a rain reflection component and A _rain which is a _{rain reduction rate} are extracted.

In this case, each of the first and second structured reflected waves may be an average value of each of the first and second structured reflected waves transmitted for each time value, and each of the first and second structured reflected waves may be transmitted for each time value. It may be an average value of the structure rainfall reflected waves.

Through the above procedure, the rainfall can be estimated by substituting P _rain and A _rain for a structure separated by the known distance R into the equations for scattering and attenuation of radio signals during commonly known rainfall. The estimated rainfall can be used to estimate scattering and attenuation of radar transmission waves due to rainfall. In addition, the calculation process may be repeated for structures separated by a plurality of different distances to obtain an equation for scattering and attenuation according to distance.

The measurement apparatus 50 sets the surface reflection wave using the radar reflection wave and the rainfall reflection component (S237). Specifically, the setting unit 550 of the measurement device 50 may define the surface reflection wave as shown in [Equation 3] by using [Equation 1].

&Quot; (3) "

Setting unit 550 assigns the radar echoes received from the radar 30 to the [Equation 3] to the P _total, and, P _rain and A _rain is sea level by substituting the P _rain and A _rain derived from the extraction unit 540 Set P _sea, which is the reflected wave.

The determination unit 560 of the measurement device 50 determines the blue wave using the surface reflected wave set by the setting unit 550 (S239). Accordingly, since the blue measurement system 100 can correct the reflection and the attenuation caused by the rainfall even when there is rainfall, the blue measurement system 100 can accurately determine the blue.

The blue measurement system according to another embodiment of the present invention will be described with reference to FIG. 5. 5 is a block diagram showing a wave measurement system according to another exemplary embodiment of the present invention.

Referring to FIG. 5, the blue measurement system 100 includes a radar 30, a measurement device 50, and a rainfall measurement device 70.

The radar 30 emits a radar transmission wave to the surface of the sea when there is rainfall, and receives the radar reflected wave reflected by the surface of the sea. The radar 30 transmits the received radar reflected wave to the measurement device 50 through the communication unit 510.

The measuring apparatus 50 controls the radar 30, sets the surface reflection wave using the radar reflected wave, and determines the blue wave using the surface reflection wave. To this end, the measurement device 50 includes a communication unit 510, an input unit 520, a control unit 530, an extraction unit 540, a setting unit 550, a determination unit 560, a display unit 570, and a storage unit ( 580). The input unit 520, the control unit 530, the display unit 570, and the storage unit 580 are the same as the input unit 520, the control unit 530, the display unit 570, and the storage unit 580 described in FIG. 1. Description thereof will be omitted.

The communication unit 510 is electrically connected to the radar 30 and the rainfall measuring device 70. The communication bride 510 receives the radar reflected wave from the radar 30 and receives the rainfall from the rainfall measuring device 70.

The extraction unit 540 extracts the rainfall reflection component and the rainfall attenuation signal from the radar reflected waves transmitted from the radar 30 through the communication unit 510 using the rainfall received from the rainfall measuring apparatus 70.

The setting unit 550 sets the surface reflection wave by using the radar reflection wave, the rainfall reflection component extracted by the extraction unit 540, and the rainfall attenuation signal.

The determination unit 560 determines the blue wave using the surface reflection wave set by the setting unit 550.

The rainfall measuring device 70 generates rainfall by measuring the amount of rainfall when there is rainfall. The rainfall measuring device 70 transmits the generated rainfall to the measuring device 50.

Herein, the rainfall measuring device 70 is formed separately from the measuring device 50, but is not limited thereto. The rainfall measuring device 70 may be formed in the measuring device 50.

A method for measuring blue waves according to another embodiment of the present invention will be described with reference to FIG. 6. 6 is a flow chart showing a wave measurement method according to another embodiment of the present invention.

Referring to FIG. 6, the radar 30 emits a radar transmission wave and receives a radar reflected wave when there is a rainfall (S310). The radar 30 emits a radar transmission wave to the sea surface when the radar transmission wave transmission start signal is received from the measuring device 50. The radar 30 receives the radar reflected waves reflected by the sea surface and the rainfall. The radar 30 transmits the received radar reflected wave to the communication unit 510 of the measurement device 50.

The rainfall measuring apparatus 70 generates rainfall by measuring the amount of rainfall (S330). The rainfall measuring device 70 transmits the rainfall through the communication unit 510 of the measuring device 50.

The measurement device 50 extracts the rainfall reflection component from the radar reflected wave (S350). Specifically, the extraction unit 540 of the measurement device 50 may define the radar reflected wave as shown in [Equation 4].

&Quot; (4) "

Where P _total is the radar reflected wave, P _rain is the rainfall reflecting component, and P _sea is the surface reflecting wave. A _rain is the rate at which radar transmissions traveling by distance R are attenuated by rainfall and are a function of rainfall, distance and frequency of propagation. The reason A _rain is set to square is because the radar transmit wave attenuates during round trip.

The extractor 540 may define the rainfall reflection component as shown in [Equation 5].

[Equation 5]

Where r is the rainfall and R is the distance from the radar 30. C is a constant determined by the characteristics of the radar 30, and a is a constant.

Therefore, the extraction unit 540 substitutes the constants set by the controller 530 in Equation 5 into C and a, and substitutes the distance at which the radar reflected wave is reflected from the sea surface into R, from the rainfall measuring device 70. Substituting the received rainfall into r, P _rain is extracted.

The extractor 540 extracts the rain attenuation signal A _rain by using the rainfall received from the rainfall measuring apparatus 70, the distance reflected by the radar reflected wave from the sea surface, and the frequency of the radar transmission wave.

The setting unit 550 of the measurement device 50 sets the surface reflection wave by using the radar reflection wave and the rainfall reflection component (S370). Specifically, the setting unit 550 may define the surface reflection wave as shown in [Equation 6] by using [Equation 4].

&Quot; (6) "

Setting unit 550 assigns the radar echoes received from the radar 30 to the [Equation 6] to P _total, and, P _rain and A _rain is sea level by substituting the P _rain and A _rain derived from the extraction unit 540 Set P _sea, which is the reflected wave.

The determination unit 560 of the measurement device 50 determines the blue wave using the surface reflected wave (S390). In this case, the display unit 570 may display blue color using the surface reflected wave under the control of the controller 530.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that the change can be made.

1 is a block diagram illustrating a wave measurement system according to an exemplary embodiment of the present invention.

2 is an exemplary view showing a transmission wave emitted from the radar according to an embodiment of the present invention.

3 is an exemplary diagram illustrating to explain a radar transmission wave and a radar reflected wave according to an embodiment of the present invention.

4 is a flowchart illustrating a wave measurement method according to an embodiment of the present invention.

5 is a block diagram showing a wave measurement system according to another exemplary embodiment of the present invention.

6 is a flow chart showing a wave measurement method according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

30: radar

50: measuring device

70: rainfall measuring device

100: blue measurement system

310: radar transmission wave

360 Radar Reflective Wave

510: communication unit

520: input unit

530: control unit

540: extraction unit

550: setting unit

560: judgment unit

570: display unit

580: storage unit

Claims (12)

In the system measuring the blue at the time of rainfall, Radar for emitting a radar transmission wave to the surface, and receives the radar reflected wave reflected by the surface; And And a measurement apparatus for extracting a rain reflection component reflected by the rain from the radar reflected waves, setting a surface reflection wave using the radar reflection wave and the rainfall reflection component, and determining the blue wave using the surface reflection wave. Blue measurement system to assume. The method of claim 1, The radar, Radar transmission wave is emitted to the fixed structure in the absence of rainfall, receiving the structure reflection wave reflected by the fixed structure, and firing the radar transmission wave to the fixed structure in the presence of rainfall, the fixed Blue measurement system, characterized in that for receiving a structure rainfall reflected wave reflected by the structure. 3. The method of claim 2, The measuring device, Extracting the rainfall reflection component and the rainfall attenuation signal from the radar reflected wave using the structure reflection wave and the structure rainfall reflection wave, and setting the surface reflection wave using the radar reflection wave, the rainfall reflection component and the rainfall attenuation signal. A blue measurement system characterized by. The method of claim 3, wherein And the structure reflection wave is an average value of the structure reflection waves periodically transmitted from the radar, and the structure rainfall reflection wave is an average value of the structure rainfall reflection waves periodically transmitted from the radar. The method of claim 1, The measuring device, An extraction unit for extracting the rainfall reflection component from the radar reflected wave; A setting unit configured to set the surface reflection wave using the radar reflection wave and the rainfall reflection component; And And a determination unit that determines the blue wave using the surface reflection wave. The method of claim 1, The measuring device, And extracting the rainfall reflection component by using the rainfall received from the rainfall measuring device in the radar reflected wave. In the method in which a blue measurement system measures blue at the time of rainfall, Firing a radar transmission wave to the surface of the sea through the radar of the wave measuring system, and receiving the radar reflected wave reflected by the surface of the wave; Extracting a rain reflection component reflected by the rainfall from the radar reflected wave; Setting a surface reflected wave using the radar reflected wave and the rainfall reflecting component; And And determining the blue wave using the surface reflected wave. The method of claim 7, wherein Before extracting the rain reflection component reflected by the rain from the radar reflected wave, Firing a radar transmission wave to a fixed structure in the absence of rainfall and receiving a structure reflected wave reflected by the fixed structure; And And firing a radar transmission wave to the fixed structure in the case of rainfall, and receiving the structure rainfall reflected wave reflected by the fixed structure. The method of claim 8, Extracting the rain reflection component reflected by the rain from the radar reflected wave, And extracting the rainfall reflection component and the rainfall attenuation signal from the radar reflected wave using the structure reflected wave and the structure rainfall reflected wave. The method of claim 9, And the structure reflection wave is an average value of the structure reflection waves periodically received, and the structure rainfall reflection wave is an average value of the structure rainfall reflection waves periodically received. The method of claim 10, Setting the surface reflection wave by using the radar reflection wave and the rainfall reflection component, And setting the surface reflected wave using the radar reflected wave, the rainfall reflecting component and the rainfall attenuation signal. The method of claim 7, wherein Extracting the rain reflection component reflected by the rain from the radar reflected wave, Measuring rainfall; And And extracting the rainfall reflecting component from the radar reflected wave using the rainfall.

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