JP2005156192A - Wave observing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display the amount of variation in a wave direction in a wave observing apparatus. <P>SOLUTION: A wave arithmetic processing section 14 acquires a wave direction Wd on the basis of a signal from a radar device 12. A section 16 for acquiring the amount of change in the wave direction acquires a wave direction change amount output ΔWdav on the basis of the wave direction Wd. A control section 18 generates display information so that display according to the wave direction change amount output ΔWdav is made at a display section 20. More detailed conditions of waves on the surface of the sea, the surface of a lake, or the like can be determined from display output on the basis of this sort of display information. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for observing at least a wave direction based on a reflected wave from a water surface, and particularly to a technique suitable for a radar-type wave observation device for a ship.

  Conventionally, a reflected wave from a water surface is acquired using a device such as a pulse radar, and various characteristics of the wave (for example, wavelength, wave velocity, wave direction, wave height, etc.) are analyzed from the reflected wave data. ing.

  For example, in Non-Patent Document 1, noise is removed by performing three-dimensional Fourier transform on a large number (32, for example) of continuous radar image information, and applying a theoretical wave equation (dispersion relational expression) to the conversion result. Thus, there is disclosed a method of extracting a three-dimensional spectrum related to an original wave and calculating a wavelength, wave speed, wave direction, wave height, and the like using the extracted three-dimensional spectrum.

  In Patent Document 1, a two-dimensional cross spectrum is obtained from continuous two-scan radar image information, and the spectrum is filtered by a theoretical wave equation (wave velocity relational equation) to obtain a wavelength, wave velocity, wave direction, wave height, and the like. A method for calculating the value is disclosed.

  Of these wave characteristics, the wave direction is important information for determining the ship's bow direction and navigation route. For example, when there is a wave coming from the stern side (so-called trailing wave), from the problem of wave resistance of the stern structure such as the hull or rudder, or from the problem of breaking the stern residential area in the case of a small ship, The bow direction (that is, the course and the maneuvering direction) is determined so as not to receive waves from behind as much as possible.

Japanese Patent Laid-Open No. 2003-21680 ESTIMATION OF SEA STATE DIRECTIONAL SPECTRA BY USING MARINE RADAR IMAGING OF SEA SURFACE, Proceedings of ETCE / OMAE 2000 February14-17,2000, NewOrleans, LA

  In this way, the wave direction is important information, but it may fluctuate greatly in time depending on the weather or the like, and conversely, it may not fluctuate much. When the wave direction changes abruptly, generally a quicker course change is required, but conversely, when the time change is small, more attention may be required. That is, the temporal change of the wave direction can be very useful information for the operator. However, conventionally, there has been no wave observation device that displays the degree of temporal change in wave direction.

  A wave observation device according to the present invention includes a wave direction information acquisition unit that acquires wave direction information based on data of a reflected wave from a water surface, and a wave direction change degree acquisition unit that acquires a temporal change degree of the wave direction. A display information generation unit that generates display information for displaying on the screen the display element or index indicating the wave direction and the display element or index indicating the degree of change in the wave direction.

  In the wave observation device according to the present invention, the wave direction information acquisition unit performs Fourier transform on data based on the radar reflected wave, extracts a wave spectrum by applying a theoretical wave equation to the conversion result, It is preferable to acquire wave direction information using a wave spectrum.

  In the wave observation apparatus according to the present invention, it is preferable that the display information generation unit generates display information so that a predetermined display element on the screen or a color of the display area changes according to the degree of change in wave direction. It is.

  In the wave observation device according to the present invention, it is preferable that the display information generation unit generates display information so that a color of a display element indicating a wave direction on the screen changes in accordance with the change degree of the wave direction. is there.

  Further, in the wave observation device according to the present invention, the display information generation unit has a colder color as the color of the display element indicating the wave direction on the screen increases, and the wave direction change degree increases. It is preferable to generate the display information so that the smaller the color, the warmer the color.

  In the wave observation device according to the present invention, it is preferable that the display information generation unit generates display information so that the luminance of a predetermined display element or display area on the screen changes according to the degree of change in wave direction. It is.

  The wave observation device according to the present invention includes a wave direction information acquisition unit that acquires wave direction information based on data of a reflected wave from the water surface, and a wave height that acquires wave height information based on the data of the reflected wave from the water surface. An information acquisition unit; and a display information generation unit that generates display information for displaying a display element or index indicating a wave direction and a display element or index indicating a wave height on a screen.

  Hereinafter, a wave observation device 10 according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration example of a wave observation apparatus 10 according to the present embodiment. 1 includes a radar device 12, a wave calculation processing unit 14, a wave direction change degree acquisition unit 16, a control unit 18, a display unit 20, and an input unit 56.

  The radar apparatus 12 is installed on land or on a ship, transmits an irradiation wave toward a predetermined wave observation water area, and receives a reflected wave from the water surface. Preferably, it is configured as a pulse radar device.

  The wave calculation processing unit 14 performs predetermined calculation processing on the reflected wave data acquired by the radar device 12 to acquire the wave direction Wd, wavelength Wl, wave velocity Wvc (and wave height Wh), and the like.

  FIG. 2 is a block diagram illustrating a configuration example of the wave calculation processing unit 14. 2 includes a radar signal acquisition unit 22, a radar interference detection unit 24, a two-dimensional calculation unit 26, an averaging unit 28, a wave spectrum estimation unit 30, and a sea state analysis unit 32.

  The radar signal acquisition unit 22 records data acquired by the radar device 12 for two consecutive scans. This data is obtained by amplifying and detecting the received reflected wave signal, and is acquired by sampling and A / D conversion at a period corresponding to the required distance resolution.

  The radar interference detection means 24 detects whether or not the data recorded in the radar signal acquisition means 22 has been subjected to radio wave interference from radio sources such as other radars and radar beacons. In the case where there is interference, the radar data of that scan is discarded, and in this example, only the radar data for two consecutive scans not receiving the interference is supplied to the two-dimensional calculation means 26 in the subsequent stage. It has become.

  There are various methods for detecting the interference in the radar interference detection means 24. For example, there is a method that considers interference when the data level exceeds a normal threshold level. Specifically, polar coordinate distance direction data is added, and interference is determined when the threshold level is exceeded. The threshold level is, for example, about 64 when an 8-bit A / D converter is used and the dynamic range is 0 to 255.

  The two-dimensional calculation unit 26 first performs intensity correction on the received radar data for two scans so as to eliminate an error in received intensity due to distance, and then converts the radar data from polar coordinates to orthogonal coordinates. In addition, as a sea surface monitoring range, radar data is also cut out, for example, in a square shape (one side length D). However, this process may be performed at the time of coordinate conversion, or may be performed before that.

ここに、Ｆ（ｋ，ｌ）：２次元のフーリエ変換値、ｆ（ｎ，ｍ）：レーダデータ、Ｆ（ｋ，ｌ）：空間スペクトル、ｎ，ｍ：座標値、ｋ，ｌ：波数、である。 Then, the two-dimensional calculation means 26 performs two-dimensional Fourier transform (FFT) on the radar data subjected to coordinate conversion for each scan.

Where F (k, l): two-dimensional Fourier transform value, f (n, m): radar data, F (k, l): spatial spectrum, n, m: coordinate value, k, l: wave number, It is.

Next, the two-dimensional calculation means 26 obtains a cross spectrum Pc (k, l) between two-dimensional FFT values for two consecutive scans of radar data.

となる。ここに、ａｔａｎ（）はアークタンジェントを示す。 Next, the two-dimensional calculation means 26 calculates an amplitude spectrum Sa and a phase spectrum Sφ for each point of the acquired two-dimensional cross spectrum Pc (k, l). The cross spectrum Pc (k, l) at each point can be expressed by a complex number, and if its real part is Re and its imaginary part is Im, they are

It becomes. Here, atan () indicates an arc tangent.

  The averaging means 28 adds the amplitude spectrum Sa and the phase spectrum Sφ for each point of the two-dimensional cross spectrum Pc (k, 1) by a predetermined number N (for example, 32 times), and divides the amplitude spectrum by dividing by N. An average value of the spectrum Sa and the phase spectrum Sφ is obtained. Since this process is performed while inputting data of two consecutive scans, if there is no radio wave interference, the data of consecutive N + 1 scans is averaged. By this averaging, variations in each scan of the two-dimensional cross spectrum Pc (k, 1) of the amplitude spectrum Sa and the phase spectrum Sφ are absorbed.

ここに、Ｄ：対象領域の一辺の長さ、ｋ，ｌ：２次元クロススペクトルの波数、Ｔ：レーダのスキャン時間、である。 The wave spectrum estimation means 30 first obtains the peak value of the amplitude spectrum Sa from the averaged two-dimensional cross spectrum Pc (k, 1). If the phase corresponding to the phase shift spectrum Sφ at the peak point is φ, the calculated wave velocity Wvc can be obtained by the following equation (5).

Here, D is the length of one side of the target region, k, l is the wave number of the two-dimensional cross spectrum, and T is the scan time of the radar.

ここに、Ｗｌ：波長である。 On the other hand, the theoretical wave velocity Wvt determined by the wave velocity relational expression, which is the theoretical equation of the wave, can be obtained from the wave property by the following equation (6).

Here, Wl is the wavelength.

ここに、ｄ：水深、ｋ_v：波数ベクトル、Ｕ：表面の流れ、である。水深が深い場合にはｔａｎｈ（）≒１とすることができ、さらにＵ＝０とすれば、分散関係式は式（８）となる。

波速の一般式Ｗｖｔ＝ω／ｋ_vを用いてωを消去すると、ｋｖ＝２π／Ｗｌとなる。したがって、上記式（６）が求められる。 Here, the derivation of Expression (6) will be described. First, generally, the wave dispersion relational expression is expressed by Expression (7).

Where d: water depth, k _v : wave vector, U: surface flow. When the water depth is deep, tanh () ≈1 can be set, and further, when U = 0, the dispersion relational expression is expressed by Expression (8).

If ω is eliminated using the general formula of wave velocity Wvt = ω / k _v , kv = 2π / Wl. Therefore, the above formula (6) is obtained.

  Thus, since both the calculated wave velocity Wvc and the theoretical wave velocity Wvt can be calculated, the reliability of the original data, that is, the radar data can be determined based on the degree of coincidence thereof. As an example, when the error of the calculated wave speed Wvc with respect to the theoretical wave speed Wvt is within ± 10%, it is adopted as correct data with little noise and used for calculation of the wave characteristics at the subsequent stage. If not, the calculation of the wave characteristics based on the radar data is not performed.

なお、ここでは、２次元ＦＦＴを行う場合の一例について示したが、これに替えて３次元ＦＦＴやその他の処理を用いることももちろん可能である。 The sea state analysis means 32 obtains the center of gravity of the adopted phase spectrum Sφ within the coordinates of the periphery of the peak value ± L, and from the center of the phase spectrum, the wavelength Wl and the wave direction Wd are respectively expressed by the following equations (9). , (10).

Here, an example of performing the two-dimensional FFT is shown, but it is of course possible to use a three-dimensional FFT or other processing instead.

  The wave direction change degree acquisition unit 16 takes the difference between the average value of the wave direction Wd for a predetermined period and the latest wave direction information based on the wave direction Wd acquired by the wave calculation processing unit 14, and further calculates the difference. An averaged wave direction change signal ΔWdav obtained by averaging the absolute values is obtained. The wave direction change degree acquisition unit 16 receives the wave direction Wd at a predetermined timing (for example, every two minutes).

  Here, an example of the configuration and operation of the wave direction change degree acquisition unit 16 will be described with reference to the drawings. 3 is a block diagram illustrating an example of the wave direction change degree acquisition unit 16, FIG. 4 is a diagram illustrating the concept of vector synthesis of the wave direction Wd, and FIG. 5 illustrates the concept of arithmetic processing of the 180 degree processing circuit 40. FIG.

  3 includes a first average processing circuit 34, a subtraction circuit 36, an absolute value acquisition circuit 38, a 180 degree processing circuit 40, and a second average processing circuit 42.

  The first average processing circuit 34 outputs a result obtained by moving and averaging a plurality of (for example, 15) data of the input wave direction Wd. Here, the latest data is used for the moving average so that the latest average output is obtained. As an example, when 15 pieces of data are used, the past 14 pieces of data and the latest piece of data are used.

  The averaging process in the first averaging processing circuit 34 is performed by vector synthesis of angle data ranging from 0 (deg) to 360 (deg). The angle θd of the wave direction information Wd is divided into an X-axis component and a Y-axis component with the Y-axis as a reference angle 0 (deg), the X-axis side is sin (θd), and the Y-axis side is cos (θd). . Each X-axis component obtained from the angle θd of 15 wave direction information used for the averaging process obtained continuously is added to obtain an added value ΣX, and each Y-axis component is added to obtain an added value ΣY. . A composite angle θg (= atan (ΣY / ΣX)) is obtained from the added values ΣX and ΣY. Although not shown in the figure, this combined angle θg exists in various quadrants depending on whether the addition values ΣX and ΣY are positive or negative. Note that atan represents an arc tangent. Further, when the addition value ΣX becomes 0, it is replaced with a value close to positive 0, for example, 0.000001, in order to prevent a calculation error.

  In order to obtain the average angle θdav of the wave direction information, if the polarity of the addition value ΣX obtained from the combined angle θg is positive, the angle θdav = 90−θg (deg) is set, and the polarity of the addition value ΣX is negative. If there is, the angle θdav = 270−θg (deg). This process is performed every time new wave direction information Wd is input, thereby making a moving average process.

  The moving average processing in the first average processing circuit 34 will be described with a specific example with reference to FIG. This moving average process is performed for 15 pieces of wave direction information Wd. In order to simplify the explanation, here, the case of two pieces of wave direction information Wd1 and Wd2 is taken as an example. The angles θd1 and θd2 of the two pieces of wave direction information Wd1 and Wd2 are 30 (deg) and 310 (deg).

  The X-axis component x1 = sin (30) = 0.5 of the angle θd1, the Y-axis component y1 = cos (30) = 0.866025, and the X-axis component x2 = sin (310) = − 0.766044 of the angle θd2. , Y-axis component y2 = cos (310) = 0.642788. Using the addition values ΣX and ΣY to obtain the combined angle θg, θg = atan (ΣY / ΣX) = atan (1.5088813 / −0.266044) = − 80 (deg). Since the polarity of the added value ΣX at this time is negative, the average angle θdav of the wave direction information Wdav is 350 (= 270 − (− 80)) (deg).

  The subtracting circuit 36 subtracts the average angle θdav from the angle θd of the wave direction information Wd at that time to obtain a wave direction change value. The wave direction change value is indicated by an angle. However, since it has both positive and negative polarities by the subtraction process in the subtraction circuit 36, the absolute value acquisition circuit 38 sets the absolute value angle for the next 180 degree processing. Convert.

  The 180 degree processing circuit 40 converts the angle of the wave direction change value within 180 (deg) so that the wave direction change value obtained at intervals of 2 minutes can be numerically processed continuously regardless of the angle value. Process. As shown in FIG. 5, in this angle conversion process, when the wave direction change value input to the 180-degree processing circuit 40 is in the range of 0 (deg) or more and less than 180 (deg), it is output as it is, and 180 (deg) or more. In the range of less than 360 (deg), it is converted into 360− (wave direction change value) (deg) and output to the second average processing circuit 42. Even when the wave direction change value changes from 0 (deg) to 360 (deg) or from 360 (deg) to 0 (deg) by this 180 degree processing, the second average processing circuit 42 Average processing can be easily performed.

  The second average processing circuit 42 performs a moving average of the wave direction change values input from the 180 degree processing circuit 40. This moving average is an average of the past 29 wave direction change values and the latest one wave direction change value, and suppresses variation, and the latest average value at each time is used as an averaged wave direction change signal ΔWdav. Output as.

  The control unit (e.g., CPU) 18 generates display information for outputting a wave state including the wave direction change degree to the display unit (e.g., display) 20. FIG. 6 is a diagram illustrating an example of the display screen 44 of the display unit 20.

  In the example of FIG. 6, the display screen 44 includes a display element 46 indicating the hull, a display element 48 indicating the latest wave direction Wd, a display element 50 indicating the average angle θd of the wave direction Wd at a predetermined time, and the wave direction Wd. A numerical display (index) 52 and an image 54 of the sea surface reflection signal obtained from the radar apparatus 12 are displayed.

  Information for generating the display screen 44 is generated by the control unit 18. As an example, the shape, color, brightness, etc. of the display elements 46, 48, 50 (excluding elements whose color and brightness change) are set in advance, and the control unit 18 uses the wave calculation processing unit 14 at the preceding stage. And an angle (posture; directivity direction) for displaying the display elements 46, 48, and 50 based on the data acquired by the wave direction change degree acquisition unit 16 and the like, and displaying them in a predetermined layout Display information on the display screen 44 (for example, the luminance value of each pixel) is generated. FIG. 6 is an example of the case where the coordinates of the display screen 44 are determined with reference to the ship so that the course (the bow direction) of the ship always points to the upper side of the screen in the wave observation device for ships. The control unit 18 acquires the angle of each display element in the screen coordinates from the relative relationship between the bow direction, the wave direction Wd, and the average angle θd, and further specifies a specified layout (display magnification, display area, display position). Display information is generated by performing arithmetic processing such as coordinate conversion. The layout of the display screen 44 may be appropriately changed by an input signal from a predetermined input unit 56 (for example, a keyboard, a mouse, an operation button, a switch, etc.). Of course, it may be configured to be displayed in an absolute coordinate system such as the earth coordinate, or may be displayed in a relative coordinate system (for example, a ship-fixed coordinate system) or an absolute coordinate system as necessary. May be switched.

  The wave direction change degree can be displayed by the color of a specific display element or display area. For example, the control unit 18 determines the color of the display element 50 corresponding to the wave direction change output ΔWdav from the correlation between the preset wave direction change output ΔWdav and the color, and displays the display element 44 on the display screen 44. 50 is displayed in the determined color. In that case, it is preferable to change the color from a warm color system to a cold color system stepwise or continuously in accordance with the degree of wave direction change. Note that the colors of display elements (46 and 48) other than the display element 50 may be changed.

  Here, there are cases where the color is preferably a warm color system as the wave direction change output ΔWdav is small, and a cold color system as it is large. Specifically, when the wave direction change output ΔWdav is 0, red, and when ΔWdav is greater than or equal to a predetermined value, blue, the wave direction change output ΔWdav is between 0 and the predetermined value. The color (spectrum) gradually changes from red → orange → yellow → green → blue. Such a setting is effective when it is desired to make it easy to understand that the wave direction change degree is small on the display screen 44.

  The inventors' research has revealed that there is a certain correlation between the wave direction change degree and the wave height, in which the wave height is higher as the wave direction change degree is smaller. FIG. 7 is a diagram showing the time direction change of the wave direction change and the wave height actually observed at intervals of 2 minutes in a certain sea area (data of about 4 days). From FIG. 7, it can be seen that there is a correlation that when the wave height is large, the wave direction change degree is small, and when the wave height is small, the wave direction change degree is large. That is, by making it easy to understand that the degree of change in wave direction is small, it is possible to easily grasp the situation where the wave is high or the situation where the wave is likely to be high.

  On the other hand, depending on the place of navigation, weather, etc., it may be considered that a greater degree of wave direction change is more important for maneuvering. In such a case, contrary to the above, it may be set so that the smaller the wave direction change output ΔWdav is, the colder the color system is, and the larger, the warmer the color is. In consideration of various cases, the display mode corresponding to the magnitude of the wave direction change degree is switched by an input signal from a predetermined input unit (for example, a keyboard, a mouse, an operation button, a switch, etc.) 56. Also good.

  The same effect can be obtained by changing the luminance of a specific display element (for example, display elements 48 and 50) or a specific display area according to the degree of change in wave direction. Furthermore, both color (spectrum) and luminance may be changed. In this case, the control unit 18 may acquire the luminance corresponding to the acquired wave direction change output ΔWdav from the correlation between the preset wave direction change output ΔWdav and the luminance.

  Thus, according to the wave observation apparatus 10 concerning this embodiment, a wave direction change degree is displayed with a wave direction. Such a display helps the operator to determine the ship operation corresponding to the wave direction. It should be noted that the same effect can be obtained by performing display according to the wave height instead of the wave direction change degree. In that case, the wave height value Wh is output from the wave calculation processing unit 14, or the wave height value is acquired from an ultrasonic wave height meter provided separately, and the wave height value is changed by the wave height in the same manner as the wave direction change degree described above. What is necessary is just to comprise so that a color may change.

  Further, on the display screen 44, the wave speed or wavelength may be displayed together. As an example, the length of the display element 50 indicating the average angle θd of the wave direction Wd in a predetermined time is longer according to the wave speed or wavelength, such as being longer as the wave speed or wavelength is larger, and shorter as the wave speed or wavelength is smaller. What should I do?

  The wave direction change degree may be output by another display mode. FIG. 8 is a diagram showing an example. FIG. 8 is a diagram showing an example of the wave direction change display area 58 provided in the display screen 44 of FIG. 6 or in another display mechanism. In this example, the wave direction change ΔWdav is made dimensionless by dividing by a predetermined value, and when the dimensionless value is 0 (that is, ΔWdav: 0), the indicated position is the left end, and the dimensionless value is 1. (That is, ΔWdav: predetermined value) is such that the indicated position is at the right end. Furthermore, an area 60 (hatching area; area on the left side of the designated position) from 0 to the designated position may be colored, or the luminance of the area 60 may be relatively increased.

  As described above, according to the wave observation device according to the present embodiment, the degree of change in wave direction is displayed in an easy-to-understand manner, so that the state of waves on the sea surface or lake surface can be grasped in more detail and quickly. become able to. In the above embodiment, the wave observation device connected to the radar device has been described as an example. However, the same effect can be obtained by performing the same processing for wave directions obtained from other than the radar device. It is possible to get. Moreover, the apparatus fixedly installed not on a ship but on land can also be comprised as a wave observation apparatus concerning this invention.

It is a block diagram which shows one structural example of the wave observation apparatus concerning embodiment of this invention. It is a block diagram which shows one structural example of the wave calculation process part contained in the wave observation apparatus concerning embodiment of this invention. It is a block diagram which shows the example of 1 structure of the wave direction change degree acquisition part contained in the wave observation apparatus concerning embodiment of this invention. It is a figure which shows the concept of the vector synthesis | combination of the wave direction performed with the average processing circuit contained in the wave observation apparatus concerning embodiment of this invention. It is a figure which shows the concept of the arithmetic processing of the 180 degree | times processing circuit contained in the wave observation apparatus concerning embodiment of this invention. It is a figure which shows an example of the display screen output by the display part of the wave observation apparatus concerning embodiment of this invention. It is a figure which shows an example of a time direction change of a wave direction change degree and a wave height. It is a figure which shows an example of the display mode of the wave direction change degree by the wave observation apparatus concerning embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Wave observation apparatus, 12 Radar apparatus, 14 Wave calculation processing part, 16 Wave direction change degree acquisition part, 18 Control part (display information generation part), 20 Display part, 22 Radar signal acquisition means, 24 Radar interference detection means, 26 2D calculation means, 28 averaging means, 30 wave spectrum estimation means, 32 sea state analysis means, 34 (first) average processing circuit, 36 subtraction circuit, 38 absolute value acquisition circuit, 40 180 degree processing circuit, 42 ( Second) average processing circuit, 44 display screen, 46 display element indicating ship, 48 display element indicating wave direction Wd, display element indicating average value θd of 50 wave directions Wd for a predetermined time, 52 numerical value of wave direction Wd Display element showing 54, video of sea surface reflection signal, 56 input section, 58 display area, 60 area for indicating the magnitude of the wave direction change.

Claims (7)

A wave direction information acquisition unit for acquiring wave direction information based on data of reflected waves from the water surface;
A wave direction change degree acquisition unit for acquiring a temporal change degree of the wave direction;
A display information generating unit that generates display information for displaying the display element or index indicating the wave direction and the display element or index indicating the degree of change in the wave direction;
Wave observation device equipped with.   The wave direction information acquisition unit performs Fourier transform on data based on radar reflected waves, extracts a wave spectrum by applying a theoretical wave equation to the conversion result, and obtains wave direction information using the wave spectrum The wave observation apparatus according to claim 1.   The wave observation according to claim 1 or 2, wherein the display information generation unit generates display information so that a color of a predetermined display element or display area on the screen changes according to a wave direction change degree. apparatus.   4. The wave observation apparatus according to claim 3, wherein the display information generation unit generates display information so that a color of a display element indicating a wave direction on the screen changes according to a wave direction change degree.   The display information generation unit displays the display information so that the color of the display element indicating the wave direction on the screen is a cold color as the wave direction change degree is large, and is a warm color as the wave direction change degree is small. The wave observation device according to claim 3 or 4, wherein the wave observation device is generated.   The display information generation unit generates display information so that the luminance of a predetermined display element or display area on the screen changes according to a wave direction change degree. Wave observation device described in 1. A wave direction information acquisition unit for acquiring wave direction information based on data of reflected waves from the water surface;
A wave height information acquisition unit for acquiring wave height information based on data of reflected waves from the water surface;
A display information generating unit that generates display information for displaying a display element or index indicating a wave direction and a display element or index indicating a wave height;
Wave observation device equipped with.

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