JPH0526546Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a partial enlarged screen simultaneous display of a scanning sonar device that performs color cathode ray tube display.

(Prior art) In scanning sonar using a color cathode ray tube, ultrasonic reflected signals received by a transducer made of multiple transducers attached to the bottom of a ship are rotated and scanned, and this is converted into an XY scan similar to that of a television. The signal obtained by rotating and scanning is used for the display screen of
It is well known that the image is converted to XY scanning and displayed on a color cathode ray tube in the form of a circular PPI as shown in Figure 9. The distance and direction to the target can be determined by the PPI display.

However, since the display area of a cathode ray tube is fixed, the display area remains the same even if the range is changed. Further, in a color cathode ray tube, the number of XY pixels is composed of m×n pixels as shown in FIG.
If m = 192 and n = 256, the maximum sonar display will be 96 in the radial direction.

Scanning sonar rotation scanning frequency to 750Hz
In this case, if the underwater sound speed is 1500 m/s,
In the 200m range, the number of rotation scans is approximately 200, and approximately 2 rotation scan signals pass through each pixel, but in the 1000m range, approximately 10 rotation scan signals pass through each pixel. Therefore, the response of the same school of fish is displayed at 1/5 the size in the 1000m range compared to the 200m range, making it difficult to see, and small schools of fish may be missed. Conventionally, as a method to expand the long-distance response, peak-holding is performed on scanning sonar signals that are within the circular range of the two dotted lines and within the angle θ. There is a method of A/D converting the signal, storing it, reading it out as a raster signal on a color television, and displaying it together with a circular scanning sonar image. There are m×n memory elements (n=p+k) as shown in Figure 11.
, the received signal detected by one transmission is peak held, and the A/D converted signal is m = 1 in the X-axis direction and p + 1 to p + k (k pieces) in the Y-axis direction. ) and when the next transmission is performed, the signal that was in m = 1 is changed to m
=2, and a new received signal is stored in m=1. This method works similarly to a color fish finder.

(Problems to be Solved by the Invention) However, the above conventional technology has the following problems.

That is, the fish school video signal F in the range of θ in FIG.
1 and F2 are peak-holded, so the image that is imaged side by side becomes an image that looks like a single line like F1' and F2', which has the disadvantage that directional resolution is lost.

In view of the problems of the prior art described above, the purpose of the present invention is to display an enlarged image that has been enlarged with resolution in the azimuth direction in addition to the distance direction, on a single color cathode ray tube display as a normal PPI image. An object of the present invention is to provide a scanning sonar device capable of simultaneously displaying an enlarged image.

(Means for Solving the Problem) The present invention has the following means configuration to achieve the above object.

That is, the enlarged image scanning sonar device of the present invention has a color cathode ray tube display that performs raster scanning; a storage device; a distance expansion setting signal for outputting a distance expansion range signal indicating a distance range to be expanded; a azimuth expansion setting means for outputting a azimuth expansion range signal indicating a azimuth range to be expanded; a distance expansion setting means and an azimuth. an enlarged display storage device that sequentially stores reflected reception signals from the enlarged area set by the enlarged setting means in storage elements at designated addresses; an enlarged display write address generation means for instructing an address of a storage element of an enlarged display storage device corresponding to the distance and azimuth position when the received signal enters the distance enlarged range and the azimuth enlarged range; The present invention is characterized by comprising: a read address generation circuit for instructing the addresses of each memory element of the memory device for display and the memory device for enlarged display in correspondence with raster scanning of the color cathode ray tube display.

(Function) The scanning sonar device of the present invention has the above-mentioned means configuration, so that the received video signal is stored in a display storage device capable of raster scanning readout of normal PPI display, and distance expansion setting means and azimuth expansion The received video signal of the enlarged area portion set by the setting means is stored in an enlarged display storage device capable of raster scanning and readout. If the enlarged area is set so that the number of storage elements occupied by the enlarged area in the enlarged display storage device is larger than the number of memory elements on the display storage device corresponding to the enlarged area, the display storage device and enlarged By performing raster scan reading and scanning with the display storage device, a normal PPI display and an enlarged area image are displayed on the color cathode ray tube display.

(Example) Hereinafter, an example of the enlarged image scanning sonar device 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 device of the present invention. First, a description will be given of the storage/writing operation of a scanning sonar signal displayed in a circle with the radius of the range. In FIG. 1, a rotation scanning signal generator 6 generates an angle signal.

For example, if you use an 8-bit counter
A 360° scanning sonar signal generates a signal in 1.4° steps (360°/256≒1.4°). If one cycle of the rotation scanning signal is 1 m, the frequency is 750 Hz.

The distance signal generator 8 uses a counter,
Reset at 0m. The input clock of the distance counter is input with a 750 Hz rotation scanning signal, and when the counter is started with a trigger signal from the transmission trigger generator 3, the distance signal is counted up every 1 m. Also, the distance signal is transmitted by the transmission trigger.
At 0m, the transmitter 2 generates a transmission pulse, and the transducer 1 transmits ultrasonic waves in the entire circumferential direction. The signal reflected by a school of fish, etc. is received by the transducer 1, amplified by the reception signal amplifier 4, converted into a rotation scanning reception signal by the waveform shaper 5, and then the first
The A/D converter 7 converts the signal into a digital signal.

9 converts the angle signal of 1.4° step from the rotation scanning signal generator 6 and the distance signal from the distance signal generator 8 into orthogonal coordinates (X,
Y) A write address generator that converts the address value into an address value and sends the write address to the storage circuit 10.
The write address generator 9 first changes the angle from 0 m to 1.4°, 2.8°, . . . 360°, and when it reaches 360°, the distance signal is added by 1 m.

There are m memory circuits 10 in the X direction as shown in FIG.
It has p memory elements in the Y direction. The X and Y address values corresponding to the angle and distance are converted into addresses using the X address m/2 and the Y address p/2 as base points. At the input of the storage circuit 10, the digital signal sent from the first A/D converter 7 is stored at an address specified by the write address generator 9. The digital signal from the first A/D converter 7 is stored at addresses 1 to m in the X direction and 1 to p in the Y direction of the storage circuit 10 in FIG.

Next, the setting of the enlargement direction and angle range will be explained. As previously described in FIG. 1, the orbital scan signal generator 6 uses an 8-bit counter at 750 Hz. 14 is an enlarged angle range setting circuit, the details of which are shown in FIG. 3, and the waveforms are shown in FIG. 4.

In FIG. 3, an 8-bit counter signal is input from the rotation scanning signal generator 6. The most significant bit of the counter is 750Hz at a in Figure 4.

When the counter value is _00H , the output of the first A/D converter 7 in FIG. 1 is a signal from the transducer 1 in the stern direction. When the counter is _80H , a signal indicating the direction of the ship is output. Since the counter is 8 bits, the angle has an accuracy of 1.4° steps. Reference numeral 23 in FIG. 3 is a center direction setting circuit for enlarging display, which is arbitrarily set by the user.
Outputs an 8-bit digital signal.

When the center is pointing toward the stern, it is 00 _H , and when it is pointing toward the bow, it is 80 _H. 24 is an angle range setting circuit for enlarged display, which outputs data of 1/2 of the set angle range as an 8-bit digital signal.

In other words, when an angle range of 90° is set, 90° = _40H , so the output of the angle range setting circuit 24 is 1/2
20 _H is sent. 25 is a subtracter, and when the center direction of expansion is directed toward the bow, the center direction setting circuit 2
3 outputs 80 _H , and when the angle range is set to 90°, the output of the angle range setting circuit 24 is 20 _H , so the output of the subtracter 25 is 80 _H - 20 _H = 60 _H. The digital comparator 27 outputs a matching pulse when the rotational scanning signal of the rotational scanning signal generator 6 becomes the same as the output of the subtracter 25, that is, when it is 60 _H , resulting in the waveform shown in FIG. 4b. Similarly, 26 in Figure 3 is an adder, and the output is 80 _H + 20 _H = A0 _H , so when the rotation scanning signal becomes A0 _H , it outputs a matching output pulse and the waveform d in Figure 4. Become.

29 in Figure 3 is a flip-flop, set S
Since the signals b and d in FIG. 4 are input to the input and reset R inputs, the output has the waveform e. e
Since the time period during which the waveform is "H" is 40 _H (AO _H -60 _H = 40 _H ), the angle range is 90 degrees. The center direction is 8
Since it is a bit signal, it can be set in any direction of 360° in 1.4° steps, and the angular range can actually be set in 22.5° steps (360°/ 16 = 22.5°) is sufficient because a 360° range can be set.

Next, an arbitrary distance setting for enlarging will be explained. In FIG. 1, 11 is an enlargement start position circuit, and 12 is an enlargement range (distance) circuit. 5 and 6 are specific examples, and 32 and 34 in FIG. 5 are programmable down counters. Since the input clock of the programmable down counters 32 and 34 is the rotation scanning signal of 750 Hz, one clock corresponds to a distance of 1 m as described above. The enlargement start position setting circuit 31 is set with distance data for starting the enlargement, and the enlargement range setting circuit 35 is set with data on the distance to be enlarged. Immediately before transmission, the set value of the enlargement start position setting circuit 31 is preset in the programmable down counter 32, and at the same time, the data of the enlargement range setting circuit 35 is preset in the programmable down counter 34. FIG. 6h is a preset signal. The programmable down counter 32 in FIG. 5 starts counting down in response to a transmission trigger (g in FIG. 6) from the transmission trigger generator 3. Programmable down counter 32 is 1m
It counts down every time, and when it reaches 0, it outputs a signal (i in FIG. 6) indicating the end of counting.

When the flip-flop 33 is set by the end signal of the programmable down counter 32, the programmable down counter 34 counts down during the time when the flip-flop becomes "H" (t in FIG. 6), and the count end signal (u in FIG. 6) is activated. is output and the flip-flop 33 is reset.

Since the input of the programmable down counters 32 and 34 is 750Hz, one count of the counters is a 1m step. The expanded range is when the output of the flip-flop 33 in FIG. 5 (t in FIG. 6) is "H".

Next, a memory write operation for enlarged display will be explained. For the addresses of the memory circuit for enlarged display, the memory circuit 16 for enlarged display shown in FIG. 2 is used, and addresses 1 to m in the X direction and addresses 1 to k in the Y direction are used. Assume that the angle is assigned to the X direction and the enlarged distance is assigned to the Y direction.

15 in FIG. 1 is the second A/D converter 1 for enlargement.
In step 5, the waveform-shaped signal is output as a digital signal. As mentioned above, the expansion distance is the time when the waveform at t in FIG. 6 is "H", so when it becomes "H",
The enlarged display write address generator 13 in FIG. 1 is designated with the Y-direction address 1 in FIG. 2.

When the expansion starts, the expansion angle signal is the fourth
When the waveform e in the figure becomes "H", the X-direction address 1 in FIG. 2 is designated. If the angular range is assigned to write addresses 1 to m in the X direction, signals in the predetermined angular range of the enlargement start position are stored at addresses (X _{1 to n} ·Y ₁ ) of the enlarged display storage circuit 16.

The range of expansion distance (t in Figure 6) is Y in Figure 2.
Since the direction address is assigned to the range from 1 to k, the address signal of the enlarged display write address generator 13 in FIG. 1 changes so that the write address in the Y direction changes in steps of enlargement distance (m)/k. death,
Since the write address in the X direction changes from 1 to m every time the address in the Y direction changes, an enlarged signal is generated in the range of coordinates X _{1 to n} and Y _{1 to k} of the enlarged display memory circuit 16 in FIG. is memorized.

Next, memory reading will be explained.

Reference signal generator 17 of FIG. 1 generates a reference signal for operating raster scanning signal generator 18. Reference signal generator 17 of FIG. A read address circuit 19 forms a read address based on the reference signal from the reference signal generator 17 and sends it out. In the read address circuit 19, the Y address output changes sequentially from 1 to n (that is, p+k), the X address increases by 1 with each repetition, and the X address sequentially repeats from 1 to m.

That is, the electron beam scanning on the display surface of the color cathode ray tube 20 corresponds to the readout address. As shown in FIG. 2, there are two memory circuits, a memory circuit 10 and an enlarged display memory circuit 16, but the addresses in the X direction are common from 1 to m, and the addresses in the Y direction are from 1 to p.
is the memory circuit 10, and 1 to k are the addresses of the enlarged display memory circuit 16, but the Y direction address of the read address is 1 to p, and then 1 to k.
If you read up to 1 as shown in Figure 11,
The Y-direction address is 1.
From p to p, there are n addresses (p+k=n).

The addresses of the memory circuit in FIG. 11 correspond to the display surface of the color cathode ray tube, and since the raster scanning and readout addresses correspond as described above, the scanning sonar data stored in the memory circuit as described above is A PPI-displayed circular signal and an enlarged signal in an arbitrary distance range and an arbitrary angle range are displayed on the color cathode ray tube 20.

Display examples in which the present invention is implemented are shown in FIGS. 7 and 8. The circle above the color cathode ray tube is the scanning sonar PPI display. Two circular dotted lines represent the expansion distance range, and a straight dotted line C from the center of the circle represents the direction toward the center of the angular range to be expanded.

Figure 7 shows an image when the angular range of magnification is 90°. F1, F2, F3, F4, and F5 are images of schools of fish. Signals within the range of 45° (90°) to the left and right of the angular center line C, which is sandwiched between the two dotted circles, are enlarged and displayed at the bottom of the color cathode ray tube.

Fish schools F1 and F2 within a 90° range are enlarged as F1' and F2'. The angle is displayed in the X direction, and the distance is displayed in the Y direction. Figure 8 shows the angle range.
This is a 360° image.

(Effect of the invention) The scanning sonar device of the invention has the configuration and operation described above, and can display an image of normal PPI display on one color cathode ray tube display and an area defined by an arbitrary distance range and an arbitrary angle range. Since the image can be displayed in parallel with an enlarged image, when the range of use is extended, fish school images that are difficult to see or may be overlooked using only the PPI display image can be enlarged and observed in conjunction with the PPI display. It has the advantage of being effective in searching for schools of fish.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a schematic diagram of a memory circuit and a memory circuit for enlarged display in the embodiment, and FIG.
FIG. 2 is a diagram showing a specific configuration of the enlargement angle range setting circuit 14 shown in FIG.
FIG. 4 shows signal waveforms at various points in FIG.
1 is a concrete diagram of the enlargement start position circuit 11 and the enlargement range circuit 12 of FIG. 1; FIG. 6 is a signal waveform diagram of each part of FIG. 5; FIGS. 7 and 8 are diagrams showing examples of displayed images in the embodiment of the present invention; FIG. 9 is a schematic diagram of the number of pixels of a color cathode ray tube display;
FIG. 10 shows a conventional PPI display and a peak hold image, and FIG. 11 shows a schematic diagram of a memory circuit. 1: Transmitter/receiver, 2: transmitter, 3: transmission trigger generator, 4: reception signal amplifier, 5: waveform shaper, 6: rotation scanning signal generator, 7: first
A/D converter, 8... distance signal generator, 9...
Write address generator, 10...Memory circuit, 11...
...Enlargement start position circuit, 12...Enlargement range circuit, 1
3: Write address generator for enlarged display; 14:
Enlargement angle range setting circuit, 15... second A/D converter, 16... enlarged display memory circuit, 17... reference signal generator, 18... raster scanning signal generator, 19... read address circuit, 20... color cathode ray tube, 23... center direction setting circuit, 24...
...Angle range setting circuit, 25...Subtractor, 26...
Adder, 27, 28...digital comparator,
29: flip-flop; 31: enlargement start position setting circuit; 32: programmable down counter; 33: flip-flop; 34: programmable down counter; 35: enlargement range setting circuit.

Claims (1)

[Scope of utility model registration request] A color cathode ray tube display that performs raster scanning; a display storage device that stores received signals so that a PPI display can be obtained by reading address scanning corresponding to raster scanning; and a distance expansion range signal that indicates the distance range to be expanded. distance expansion setting means for outputting an azimuth expansion range signal indicating the azimuth range to be expanded; an enlarged display storage device that sequentially stores wave signals in memory elements at designated addresses; upon receiving the distance enlarged range signal and the azimuth enlarged range signal, the reflected received wave signal enters the distance enlarged range and the azimuth enlarged range; Sometimes, an enlarged display write address generation means for instructing the address of the memory element of the enlarged display memory device corresponding to the distance and azimuth position; and an address of each memory element of the display memory device and the enlarged display memory device; An enlarged video scanning sonar device, comprising: a readout address generation circuit for instructing a color cathode ray tube display in response to raster scanning;