JP4091454B2 - Scanning sonar - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of scanning sonar equipped on a ship for detecting a school of fish in the sea.
[0002]
[Prior art]
When searching for a school of fish using a scanning sonar equipped on a ship, first, a wide range is searched, and when a school of fish can be detected at a long distance, the ship is operated to approach the school of fish in order to capture the school of fish. At this time, the scanning sonar detection range and the depression angle of the transmission / reception beam should be appropriately switched in accordance with the distance and depth to the school of fish, and tracking must be continued so as not to lose sight of the searched school of fish.
[0003]
The scanning sonar used in this way has a function capable of controlling the detection range and the depression angle of the transmission / reception beam in order to perform a search at a long distance and a tracking to a short distance.
[0004]
FIG. 3 is a block diagram of a conventional scanning sonar. FIG. 3A is a block diagram for a single screen display, and FIG. 3B is a block diagram for a two screen display.
3A includes a reception circuit 12 and a transmission circuit 13 that can switch the detection range and the depression angle of the transmission / reception beam, and includes a range control unit 15 and a depression angle control unit 16 that control the switching. ing.
[0005]
In FIG. 3A, the signal received by the receiving circuit 12 is converted into a digital signal by the A / D converter 14, subjected to signal processing such as averaging by the signal processing unit 1, and output. This received signal is converted into PPI image data of orthogonal coordinates by the scan converter 8, stored in the display image memory 5, and a sonar image is displayed on the display 7.
[0006]
FIG. 4 is a diagram showing a display example of a conventional scanning sonar, and FIG. 4A is a display example in the case of the one-screen display of the conventional scanning sonar described above (FIG. 3A). is there. In this case, only the currently received image is displayed (see, for example, Patent Document 1).
[0007]
[Patent Document 1]
Japanese Utility Model Publication No. 5-26546 (columns 2 to 4, Fig. 1)
[0008]
The left side of FIG. 4A is a sonar image display area, in which a sonar PPI image 31 and its own ship position mark 24 are displayed at its center, and its own ship heading mark 26 is displayed at the upper periphery. The right side of FIG. 4A is a sonar specification display unit 23 that displays sonar specifications such as a scanning sonar detection range and a depression angle of a transmission / reception beam.
[0009]
In the block diagram in the case of two-screen display shown in FIG. 3B, the output of the scan converter 8 is directly input to the display image memory 5 as real-time PPI image data. When an image at a certain point in time as image data in the display image memory 5 is to be saved, it is stored in the image memory 17. The stored image data is stored in the display image memory 5 along with the real-time image data as past PPI image data.
[0010]
The two PPI image data stored in the display image memory 5 are displayed on the display device 7 as a two-screen display. FIG. 4B shows an example of two-screen display. Two screens of an upper sonar image 32 and a lower sonar image 33 are displayed in the left sonar image area of FIG.
[0011]
The upper sonar image 32 shown in FIG. 4B is obtained by cutting out and displaying the upper semicircle indicated by the oblique lines of the real-time PPI image shown in FIG. 4C. The lower sonar image 33 is shown in FIG. The upper semicircular part of the bow direction shown by the oblique line of the past PPI image stored in the image memory 17 shown in (d) is cut out and displayed.
[0012]
[Problems to be solved by the invention]
In general, the number of fish schools is not limited to one, and there are often a plurality of fish schools. In addition to the detected fish schools, there is a possibility that even better fish schools may exist in searchable sea areas. Therefore, in order to obtain a desired catch, it is necessary to keep track of a school of fish that can be detected once and approach, and search for a better school of fish around the ship.
[0013]
In the conventional scanning sonar having the configuration shown in FIG. 3, in order to search for a long distance fish school while tracking a short distance fish school, it is necessary to appropriately and quickly switch the detection range and the depression angle of the transmission / reception beam, You have to stare at the screen displayed each time you switch to find and track a school of fish. If this operation and observation of the display screen are not performed properly, there is a risk of overlooking a school of long distances or losing sight of a school of short distances, and a lot of experience and labor were required to operate the scanning sonar.
[0014]
As a means to solve this drawback, two scanning sonars are provided for both long-distance search and short-distance tracking, and both search and tracking are performed. However, since two expensive scanning sonars are required, it is economical. There was a general problem.
[0015]
In addition, the conventional two-screen display method having the configuration shown in FIG. 3B only allows simultaneous observation of images at a certain point in the past. The same operation as the one-screen scanning sonar operation shown in (a) of FIG. 3 is necessary, and it does not particularly reduce experience and labor.
[0016]
In view of the above-mentioned problems of the prior art, an object of the present invention is to display a plurality of screens of a long distance detection screen and a tracking screen with a depression angle at a short distance in a scanning sonar by using a single scanning sonar. An object of the present invention is to provide a scanning sonar that can search for a school of fish at a long distance and track an approaching school of fish, and can be easily operated without requiring experience, skill or labor.
[0017]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the first configuration of the present invention is the all-round scanning sonar that can change the detection range and the depression angle of the transmission / reception beam. It is a scanning sonar characterized in that a plurality of received images corresponding to a plurality of combinations with different depression angles can be displayed on one display screen and observed.
(A) The number of signal processing circuits equal to a predetermined number of combinations of detection ranges and depression angles (b) Received image signals provided corresponding to each of the signal processing circuits and processed by the signal processing circuits As the PPI image data of the orthogonal coordinates transformed from the azimuth distance coordinates by the scan converter, the same number of received image memories (C) as the received signal memories (C) stored separately and a plurality of predetermined combinations of detection angles and depression angles Range 俯 angle set designator for switching one combination among them (d) Switching the input to the signal processing circuit and switching the output from the signal processing circuit to the scan converter in accordance with the instructions of the range 俯 angel set designator Further, a storage area corresponding to the display screen of the switch (e) display that switches the input from the scan converter to the received image memory. A display image memory having (f) a region to be observed among the PPI image data stored in each of the reception image memories, and the read PPI image data in the display display screen corresponding region of the display image memory Read / write means for arranging and storing in a display (G) Display for displaying the received image stored in the display image memory on the screen
The second configuration of the present invention is a scanning sonar in which the group designation of the range depression angle set designator in the first configuration is automatically performed according to a predetermined sequence.
[0019]
A third configuration of the present invention is a scanning sonar in which the set designation of the range depression angle set designator is performed by an operator's operation in the first configuration.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention changes the detection range and the depression angle of the transmission / reception beam in order to search for a school of fish at a long distance or to track a school of fish approaching a short distance in a conventional scanning sonar. When it is necessary to search and track fish simultaneously to solve the problem of observing only received images and losing sight of short-distance fish during long-distance search or losing sight of long-distance fish during short-distance tracking When the detection range and the depression angle of the transmission / reception beam are changed, the received image in each case can be observed on the same screen.
[0021]
In general, when searching for a school of fish far away from the ship, it is appropriate that the detection range is long and the depression angle of the transmission / reception beam is small (shallow). On the other hand, the ship is approaching the searched school of fish. In the stage of tracking or capturing so as not to lose sight of the school of fish, the detection range may be short, and the depression angle of the transmission / reception beam must be large (deep).
[0022]
In this way, when searching for a distant school of fish and when tracking a nearby school of fish, the detection range and depression angle suitable for observation are different, and the detection range and depression angle suitable for that stage can be considered even in the intermediate stage. .
[0023]
Therefore, in the present invention, a plurality of sets of detection ranges and depression angles suitable for each stage are set, and the sonar is sequentially operated with the plurality of detection ranges and depression angles by a predetermined sequence or an operator's operation, The received image data for each set is stored in the received image memory, and the image data of the region to be observed is read from each received image data of each memory and displayed on the display screen of the display at the same time. Each received image suitable for each stage of the distance between the fish and the school of fish can be observed on the same screen.
[0024]
【Example】
Hereinafter, embodiments of the scanning sonar of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of an embodiment of the multi-screen display scanning sonar of the present invention. In FIG. 1, the transmission / reception unit of the scanning sonar includes a reception circuit 12 and a transmission circuit 13 that can change the detection range and the depression angle of the transmission / reception beam, and a range control unit 15 and depression angle control for controlling these. The unit 16 is configured.
[0025]
The range depression angle set designator 3 designates a preset combination among the number of combinations that the range control unit 15 and depression angle control unit 16 can change. This designation may be performed automatically according to a predetermined sequence, or may be performed by an operator's operation. For example, the range control unit 15 can change the detection range into two types of 2000 m and 500 m, and the depression angle control unit 16 can change the depression angle of the transmitted and received beam into two types of 0 degree and 30 degrees. From these four sets, two sets are set in advance: a detection range of 2000 m and a depression angle of 0 degrees, which is effective for fish school search, and a detection range of 500 m and depression angle of 30 degrees, which is considered effective for fish tracking. One of these sets is designated by the range depression angle set designator 3.
In addition, it is free to make the detection range and the depression angle different values in each group.
[0026]
The received signal transmitted according to the detection range and the depression angle controlled by the range control unit 15 and the depression angle control unit 16 is converted into a digital signal by the A / D converter 14, and the first switch 4-1. Is output.
[0027]
The signal processing unit 1 includes signal processing circuits 1-1 to signal processing circuits 1-N that are the same as the number N of preset ranges and depression angles. In the case of the above example, the number of signal processing circuits is two because the preset groups are two sets of the detection range 2000 m and the depression angle 0 degree and the detection range 500 m and the depression angle 30 degrees.
[0028]
The digital signal output of the A / D converter 14 is switched by the first switch 4-1 according to the designation from the range depression angle set designator 3 and input to the signal processing circuit corresponding to the designated group and preset. Signal processing such as averaging processing corresponding to the set of the range and depression angle is performed. Similarly to the signal processing unit 1, the reception image memory unit 2 includes reception image memory 2-1 to reception image memory 2-N having the same number of preset ranges and depression angles N.
[0029]
The received image signal processed by the signal processing circuit specified by the signal processing unit 1 is orthogonalized from the azimuth distance coordinates by the scan converter 8 via the second switch 4-2 switched by the specification of the range depression angle set designator 3. It is converted into PPI image data of coordinates. The PPI image data output from the scan converter 8 is switched and specified by the third switch 4-3 according to the specification of the range depression angle set specifier 3 in the same manner as the first switch 4-1 and the second switch 4-2. And stored in the received image memory corresponding to the set.
[0030]
The read / write instruction unit 6 reads an area to be observed for each of a plurality of PPI image data stored in each received image memory of the received image memory unit 2, and reads the PPI image data of the area to be observed on the display screen in advance. The writing to the display image memory 5 is designated so that it is displayed in the determined display area. The display 7 displays the image signal written in the display image memory 5.
[0031]
FIG. 2 is a two-screen display example in the case of two sets of the detection range 2000 m and the depression angle 0 degree and the detection range 500 m and the depression angle 30 degrees. On the left side of FIGS. 2A, 2B, and 2C, two sonar images are displayed in the sonar image area divided into an upper part and a lower part. The right side of FIGS. 2A, 2 </ b> B, and 2 </ b> C is a sonar specification display unit 23 that displays sonar specifications such as a scanning sonar detection range and a depression angle of a transmission / reception beam.
[0032]
The upper sonar images 21 in FIGS. 2A, 2B, and 2C are obtained by displaying a hatched portion of a PPI image having a range of 2000 m and a depression angle of 0 degree shown in FIG. . Within these upper sonar images 21, a ship position mark 24 and a ship heading mark 26 indicating the positional relationship of the sonar images are displayed.
[0033]
Note that the operation of cutting out the hatched portion in FIG. 2D is performed in the PPI image data stored in the received image memory corresponding to the depression angle 0 degree in the range 2000 m in the received image memory unit 2 in FIG. The area specified from the above is read by the instruction of the read / write instruction unit 6, and the partial PPI image data is written in the specified area of the display image memory 5.
[0034]
The lower sonar images in FIGS. 2A, 2B, and 2C are obtained by displaying different portions of the PPI display with a range of 500 m and a depression angle of 30 degrees. The lower sonar image 22 in FIG. 2 shows the upper semicircle shown by the diagonal line in FIG. 2E, the lower sonar image 28 in FIG. 2B shows the central part shown by the diagonal line in FIG. 2F, and (c) in FIG. The lower sonar image 29 of FIG. 2 is a display of the lower semicircle portion indicated by the diagonal lines in FIG.
[0035]
Operations for cutting out the hatched portions in (e), (f), and (g) of FIG. 2 are performed by an instruction from the read / write instruction unit 6 as in the case of the upper sonar image described above.
[0036]
【The invention's effect】
As described above, the scanning sonar of the present invention sets a plurality of combinations of the detection range and the depression angle of the transmission / reception beam in advance, and automatically sets the plurality of sets according to a predetermined sequence or by an operator's operation. The sonar is operated sequentially with the detection range and depression angle, the received image for each group is stored in the received image memory, the image data of the area to be observed is read from each received image data of each memory, and the display screen of the display Since they are displayed side-by-side, they are losing sight of deep-angular fish at close range while searching for long-distance fish at a shallow angle, and on the contrary, they are tracking deep-angled fish at short distance. In the meantime, you won't lose sight of shallow fauna fish at long distances, so you don't need advanced sonar operations and screen observation skills to prevent you from losing sight. There is an advantage.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment of a scanning sonar of the present invention.
FIG. 2 is a two-screen display example in the case of two sets of a detection range of 2000 m and a depression angle of 0 degrees and a detection range of 500 m and a depression angle of 30 degrees in the scanning sonar of the present invention.
FIG. 3 is a block diagram of a conventional scanning sonar.
FIG. 4 is a diagram showing a display example of a conventional scanning sonar.
[Explanation of symbols]
1 signal processing unit 1-1 signal processing circuit 1-2 signal processing circuit 1-N signal processing circuit 2 received image memory unit 2-1 received image memory 2-2 received image memory 2-N received image memory 3 range depression angle set designation 4-1 First switch 4-2 Second switch 4-3 Third switch 5 Display image memory 6 Read / write instruction unit 7 Display 11 Transceiver 12 Receiver circuit 13 Transmitter circuit 14 A / D converter 15 range control unit 16 depression angle control unit 17 image memory 21 upper sonar image (front display of range 2000 m)
22 Lower sonar image (front display of range 500m)
23 Sonar specification display section 24 Own ship position mark 25 Own ship position mark 26 in lower sonar image Own ship heading mark 27 Own ship heading mark 28 in lower sonar image Lower sonar image (display in the vicinity of range 500 m)
29 Lower sonar image (rear display of range 500m)
31 Sonar PPI image 32 Upper sonar image 33 Lower sonar image 34 Own ship position mark in lower sonar image 35 Own ship heading mark in lower sonar image

Claims (3)

In an all-round scanning sonar that can change the detection range and the depression angle of the transmission / reception beam, a plurality of received images corresponding to a plurality of combinations having different detection ranges and depression angles are provided on one display screen by including the following means: Scanning sonar that can be displayed and observed.
(A) The number of signal processing circuits equal to a predetermined number of combinations of detection ranges and depression angles (b) Received image signals provided corresponding to each of the signal processing circuits and processed by the signal processing circuits As the PPI image data of the orthogonal coordinates transformed from the azimuth distance coordinates by the scan converter, the same number of received image memories (C) as the received signal memories (C) stored separately and a plurality of predetermined combinations of detection angles and depression angles Range 俯 angle set designator for switching one combination among them (d) Switching the input to the signal processing circuit and switching the output from the signal processing circuit to the scan converter in accordance with the instructions of the range 俯 angel set designator Further, a storage area corresponding to the display screen of the switch (e) display that switches the input from the scan converter to the received image memory. A display image memory having (f) a region to be observed among the PPI image data stored in each of the reception image memories, and the read PPI image data in the display display screen corresponding region of the display image memory Read / write means for storing side by side (G) Display for displaying received image stored in display image memory on screen 2. The scanning sonar according to claim 1, wherein the group designation of the range depression angle group designator is automatically performed according to a predetermined sequence. The scanning sonar according to claim 1, wherein the group designation of the range depression angle group designation device is performed by an operation of an operator.

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