JPS58198776A - Display device of sonar - Google Patents

Abstract

PURPOSE:To facilitate the discrimination of a detected object, by selecting detection signals from plural directions out of detection signals from a wide-range directions and storing selected detection signals in every transmission and displaying courses of detection signals with the passage of time in every transmission on a display while shifting them from one another. CONSTITUTION:Detection signals from eight directions in five transmissions are displayed stereoscopically with less overlap so that these detection signals in every transmission are shifted by b-number of picture elements in the depth direction and a-number of picture elements in the time direction. In this display system, a picture is moved left for a length corresponding to a-number of picture elements in the time direction and is moved upward for a length corresponding to b-number of picture elements in the depth direction each time when the transmission is performed. When pictures overlap, the display of a picture concerning latest detection signals, namely, a picture placed in the rightmost position on the display screen is preferred.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underwater detection device such as a searchlight sonar or a scanning sonar that detects a wide range of directions, and particularly relates to a display device that displays the time course of detection signals returning from a wide range of directions. .

Conventional underwater detection devices of this type transmit omnidirectional ultrasonic pulses in a wide range of directions, for example.

The reflected waves returning from each direction are received by ultrasonic wave receivers having individual directivity directions for each direction. When the reflected waves returning from each direction are displayed on the cathode ray tube of the display device, each reflected wave is time-seriesized at high speed to sample the reflected waves on the equidistant line, and the sampling signal is used to display the reflected waves on the equidistant line. , the electron beam of a cathode ray tube that performs spiral scanning is intensity-modulated, and the reflected waves from each direction are displayed at each corresponding azimuth position.

However, in such display devices, nine reflected waves are often displayed in a mosaic pattern on the cathode ray tube due to the directivity of the ultrasonic receiver. Also.

Since the reflected waves returning from the underwater can are relatively unstable due to the movement of the ship, etc., it is relatively difficult to distinguish on one display whether noise is being displayed or a detected object is being displayed. In particular, when the detected object is a small object, the detected object is displayed as a dot on the display 9, and the display blinks due to the movement of the ship, etc., making it even more difficult to identify the detected object.

In addition, since such a display device displays the detected object instantaneously, the operator must rely on the operator's memory of the past movement of the detected object to determine the movement of the detected object over time. Therefore, it is difficult to accurately grasp the continuous movement of the detected object.

In view of the above, an object of the present invention is to display detection results in a wide range of directions on a display, and to select reflected waves (detection signals) returning from a desired range direction.

By displaying the time course of the selected detection signal on the same display or a separate display each time it is transmitted, it is possible to clearly identify the presence or absence of a detected object, and also to monitor the movement of the detected object. can be understood accurately and easily. An object of the present invention is to provide a display device in an underwater detection device.

Hereinafter, nine embodiments of the present invention will be described in detail based on embodiments shown in the drawings.

In addition, in the present invention, in two consecutive directions ゛)
Four display methods for displaying the time course of the detection signal will be shown, and each display method will be explained. In addition,
As shown in Figure 1, the display screen of detection signals (received signals) displayed by each of these display methods is 9 L in the time direction (Y direction) and M in the depth direction (X direction), that is, the total number of display screens is 9. L
It is composed of xM pixels.

(1) First surface water type: This display method uses detection signals from consecutive multiple directions among the reflected waves (detection signals) that return from all directions in the case of an all-round scanning sonar. The obtained image of the detected object is divided into 1 corresponding to the number of transmissions related to ultrasonic wave transmission.
This is a pseudo-stereoscopic display that is displayed continuously over time on one display screen. Specifically, as shown in Figure 2, the detection signals from eight directions from 0 to A (n) are shifted by b pixels in the depth direction and a pixel in the time direction, and are transmitted five times from each other. There is little overlap and the display is three-dimensional. In addition, in FIG.

Of each fan-shaped part (Sl) to (SB) due to 5 transmissions.

The display in the fan-shaped part (S□) at the right end is the display for the latest signal, and the display in the sector-shaped part (SB) at the left end is the display for the transmission four signals ago. Therefore, in this display method, each time the image is transmitted, the image is moved to the left by a pixels in the time direction and upward by b pixels in the depth direction. Furthermore, when nine images overlap, priority is given to displaying the image related to the new detection signal, that is, the image located on the right side of the display screen. In addition, the rightmost fan-shaped part (Sl)
The vertex of is C pixels from the right edge of the display screen, and d from the top edge of the display screen.
On the other hand, the arc portion of the fan-shaped portion has a spread in the time direction of (2G-1) pixels, and the radius of the fan-shaped portion is f pixels. However, tAt") is displayed by f pixels. Note that unlike in FIG. 2, the two images may be moved downward as they go to the left, or they may be moved directly horizontally.

Each vertex of the fan-shaped portions (Sl) to (SB) is an oscillation point,
In addition, in the figure, the shaded area (BL)... indicates the sea low, and the fan-shaped area (FH)... indicates the detected object (school of fish).

(2) Second surface water type: In the first surface water type, in order to avoid overlapping of one image as much as possible, the image moves upward as it moves to the left of the display screen, but 9 images All scale factors are the same. On the other hand, in the second table hydraulic system, as the two images move to the left of the display screen, the scale ratio of the two images is sequentially changed, and the images move in the direction of the arrow, as shown in Figure 3. That's what I do.

The direction of the arrow in FIG. 8 is the upper left, but it may be the lower left or the true left.

(3) 8th table hydraulic type: In the 1st table hydraulic type, in order to avoid overlapping of two images as much as possible, every time it is sent, it is sent to the left of the 9th display screen.

The image moves, which causes each sector (S,) to (SB
) is moving. On the other hand, in the eighth table hydraulic system, as shown in FIG. The image is moved in the direction of the arrow by sequentially changing the scale of the image and displaying each fan-shaped portion (Sl) to (SB) on the display screen.

In addition, in Fig. 4, the largest fan-shaped part (Sl)
or the latest received signal and gives priority to other received signals.

(4) Fourth display method: This display method is a modified display method when the image is moved straight in the first display method, as shown in FIG.

Each of the display methods described above has advantages and disadvantages. For example, 1st. In the second display method.

It has the advantage of being displayed many times and having little screen overlap, but it has the disadvantage of having a narrow two-view angle.

Third. In the fourth display method, the opposite is true. In addition, in the first display method that moves the image straight to the left, there will be more seeds on two screens, but the degree of this is relatively low, and the number of fish schools will be smaller than in the first display method that moves the image to the upper left or lower left. It has the advantage that movement in the depth direction is easy to understand. Furthermore, the second display method has the advantage of providing a deep display, and the third display method has the advantage of making it easy to see the moving direction (especially the angular direction) of the school of fish.

Next, among the above display methods, each block circuit for displaying images across the first display method will be described.

(7) (A) First block circuit for the first display method: Before going into a detailed explanation of the first block circuit, the memory used in the first block circuit will be explained in detail. 6th
The figure is a conceptual configuration diagram of the memory for explaining the internal configuration and spacing of the memory. That is, the memory has g bits per pixel (therefore, for each M pixel in the depth direction, the memory is arranged in the 2-time direction similarly to the display screen of FIG.

It is possible to express an image with a number of shading changes of 2 on a black and white cathode ray tube, and with a number of color changes of 2 on a color cathode ray tube).

It has a storage capacity of LXMXg. 9 For example, the pointing direction is θn, θn+1,..., θn+
The ultrasonic wave is transmitted from the directional transducer to receive signals from a total of (α+1) directions that are received by slightly different directional transducers such as a (n+α<N −1). Each time, the data is written in the memory in a shifted manner. This writing will be explained with reference to FIG.

In FIG. 6, the first fan-shaped writing part (81'') is the latest display (8) signal writing part corresponding to the first fan-shaped display part (Sl) in FIG. ')
is the oldest display signal writing portion corresponding to the fifth fan-shaped display portion (S5) in FIG. However, when the latest display signal is written to a large number of memory elements corresponding to the first fan-shaped write portion (S□) in FIG. 6 in this memory, the corresponding rectangular portion (19 2O-1) in the time direction.Here, the size of the corresponding rectangular portion (trend mark) in the memory is determined by the size corresponding to the first fan-shaped writing portion (St). f2 in the depth direction and 20-1 in the time direction. Then, when the coordinate transformation output (xe, ya) is ? (o, o), the coordinates Conversion output (
When xC9yC) is (f-1, 2cm2), a signal is written in the lower left corner 0 of the corresponding rectangular portion. In addition.

In FIG. 6, for example, the first fan-shaped writing part (S1')
is divided into upper and lower parts, but the upper right corner (Pe) is connected under the lower left corner 0.

Next, regarding the reading of the signal written in the memory, after the signal starts to be written in the first sector-shaped writing part (S1'), it is written in the fifth sector-shaped writing part (Ss) by the ninth transmission. Until the signal started to be rewritten, the information in the memory element at the point indicated by the black circle (-) in FIG. It is displayed in the upper right corner of the display screen in Figure 1.The right end part (mark) in Figure 6 (rectangular part for 8 pixels x M pixels) is the first fan-shaped writing part (S After the signal has been written.

By the time signal No. 1 begins to be written in the next fan-shaped writing section.

This is the part where the previous information in memory must be erased. By writing signals to memory in this manner, the required number of memories can be reduced.

Next, a first block circuit that displays an image using the first display method using the memory will be described.

FIG. 7 is a first block circuit diagram for displaying an image based on the first display method.

Symbol (1) is an ultrasonic transducer that transmits ultrasonic pulses in a wide range of directions and receives reflected waves from various directions in the water. As shown in the figure, the pointing direction is θ. , θ□, θ2. ....

The directional transducer (To
) (T1) ("l... (TN - t) are arranged along the circumferential direction. This time series circuit (2) is a time series circuit that electronically switches the received (detection) signal to time series, and this time series circuit (2) is connected to a movable terminal (S) as shown in FIG.
oo) and.

Directional transducer (To) (T□) (S...(TN
-t) connected to the fixed terminals (So
) (Sl) (%)...(8N-1). Fixed end of time series circuit (2)...(SN-t
) are successively removed from their fixed terminals (Soo ) by individually successively contacting them. (3) is the directional transducer (To) (T1) (T2),'' (TNl) when transmitting ultrasonic pulses in the ultrasonic transducer (1).
3 at the same time to transmit ultrasonic pulses in a wide range of directions, and (4) is an azimuth counter that is an N-ary up counter that counts the pulse train sent out from the splitter (5). This azimuth counter (4) counts the pulse train of the divider (5) from O to N-1.

The time series circuit (2) is a directional transducer (To) (T□)
('fri...) Controls the time series timing for making one cycle of each detection signal from (TN-1) and converting it into a time series. /
When sent to the D converter (7), the count value is N-1
to O, and at this time a distance counting pulse is sent to the distance counter (8). Therefore, 2 time series circuits (2
) is the directional transducer (To) (TI) (T2) ・(TN
-1) Send out a detection signal to the A/D converter (7). (9) is a display range setting device with an output of A in), 01
is the frequency f. (IJz) is a clock pulse generator that generates a clock pulse, Qηc is a display time counter that is an L-adic up counter for scanning a signal in the time direction of the display screen, and (2) is a display time counter that generates a signal in the depth direction of the display screen. The scanning electron beam in the color cathode ray tube (c) is controlled in the time direction by the count output from each of the display depth counter (to) α or the above-mentioned counters Ql) (2). They are a display time direction deflection circuit and a display depth direction deflection circuit that deflect the light in the depth direction. 00 is a display direction setting device. When the display power position is set to n in the display direction setting device QI3, the detection signal from the direction of θn to θn+α, that is, the (α+1) direction (80,000 position in Fig. 2) is displayed on the display screen. It will be displayed. αη is an addition circuit that adds the display orientation setting output from the display orientation setting device OQ and the orientation output from the orientation counter (4), and the addition circuit α adds the display orientation setting output from the display orientation setting device QIS. Correspondingly, the direction counter (4
) bearing output from.

That is, outputs from 0 to α are derived when the count value is from n to n+α. (C) compares the reference input (0 to α) with the addition output from the adder circuit a, and when an output between 0 and α is derived from the adder circuit αη, it is sent to the switch via the OR circuit OI. A comparison output is derived to switch the members. Switch (1
) is switched to the illustrated position by the comparison output from the comparison circuit (to), the clock pulse from the clock pulse generator 0 is guided to the memory via this switch (e). This clock pulse is a write pulse for writing a signal into the memory Qη, and when its level is high, the signal is written into the memory (c).

(b) is the direction counter (4) and distance counter (8).
) is a flip-flop for erasing information for erasing the previous information after writing a signal for one transmission, and this information erasing flip-flop (a) is used as a distance counter (8).
It is set by the setting pulse from the distance counter (8) when the count value changes from N-1 to O.翰 (ha)
are a counter for writing in the depth direction and a counter for writing in the time direction, respectively, in the memory (c), and these two counters (a) are the distance counter (8) when the distance counter (8) is N-1.
It is reset by using the set pulse from the distance counter (8) when it becomes 0 as the reset pulse. Note that the depth direction writing counter (A) is an M-ary up counter, and the 9 time direction writing counter (A) is an M-ary up counter.
C) is an a-adic up counter. Also.

When the information erasing flip-flop (a) is set.

The set output switches the switches (6), (e), and (c) to the information erasing side, thereby erasing information.

On the other hand, the 9 time direction writing counter (F) is reset with the reset pulse from the distance counter (8) together with the depth direction writing counter () as described above, and then the clock pulse is sent together with the depth direction writing counter (E). Counts the clock pulses from the generator (10) for aXM minutes, and writes no signal to the memory Q information erasing portions (0 portions in Fig. 6) via the switch @ (c). Then, both of these counters @ In (c), when the aXM count ends, the writing of information erasure ends, and the transmitter (3) is driven by the output of the 2-hour direction writing counter (c), and at the same time, the latch cap also starts the direction counter (4). and the distance counter (8) is reset.

The switch (6) outputs a no signal for erasing the memory (c) to the A/I converter (7) while the clip-flop for erasing information is set. In addition, a switch (
C) is used as the write address of the memory Q] while the information erasing flip-flop (A) is set.

The outputs of the depth direction writing counter (to) and the time direction writing counter (2) are outputted to the memory through the switch (c). Furthermore, the switching circuit is driven as described above by the comparison output output from the comparison circuit (to), and is also driven via the OR circuit 00 while the information erasing flip-flop (a) is set. The clock pulse generator 0 is also driven by its set output;
The write timing clock pulse from 1 is passed. The switch (a) switches the write/read address of the memory η in response to the clock pulse of the clock pulse generator Q1, and when the level of the clock pulse of the clock pulse generator αQ is high, the write address, which is the addition, is switched. Vessel 6! The output of I(to) is connected to the memory lυ. C (the force is from O indicated by the addition circuit αη to α,
That is.

The direction from θn to θn+α, and the distance counter (
8) is shown in polar coordinates from O to f-1, that is, from 0 to A). For transferring the signal to each position in the memory Q) indicated by rectangular coordinates from 0 to f-1 in the depth direction and from O to 20-1 in the time direction.

This is a coordinate converter consisting of read-only memory. Therefore, the capacity of this coordinate converter 6]) is (α+
1)×fxh. However, h is the total number of bits when f and 2C are expressed in binary numbers. FIG. 9 is a diagram showing the configuration of the coordinate converter. Incidentally, a signal is written into the corresponding rectangular portion (the crow portion) in the memory (c) in FIG. It is for writing a signal in the first fan-shaped writing part (81'),
There is no indication as to where in the memory Qme the entire corresponding rectangular portion is written. Therefore, the adder (a)
The output value is the upper right corner of the corresponding rectangular part (Δ mark in Figure 6)
writing position in the time direction (yl in Figure 6)
On the other hand, the latch circuit (A) latches the output value of the adder (A) with the transmission trigger pulse of the 9-hour writing counter (C). Therefore, the latch circuit (goods)
, the writing position (y position in FIG. 6) of the upper right corner (△ mark in FIG. 6) of the corresponding rectangular portion one transmission ago is stored. Note that, in the case of a negative subtraction value, the adder (2) outputs a positive value obtained by adding βL to the subtraction value. However, β is a positive integer such that the output value of the adder (2) ranges from 0 to L-1.

Next, the adder (2) is used to indicate the write position (xl in FIG. 6) in the depth direction of the upper right corner (△ mark in FIG. 6) of the corresponding rectangular portion, and is used to indicate the writing position (xl in FIG. )
latches the output value of the adder (to) with the transmission trigger pulse of the 9-hour writing counter (c). Therefore, the writing position in the depth direction of the upper right corner of the corresponding rectangular portion one transmission ago is stored in the latch circuit (2). Note that, in the case of a negative subtraction value, the adder (to) outputs a positive value obtained by adding ¥M to the subtraction value.

However, ′v is the output value of the adder (to) from 0 to M
It is a positive integer that equals -1. Adder - (to) is
As mentioned above, it instructs where to write the fan-shaped part in the memory (b), and if each added value of these adders (1) exceeds M-1°L-1, The values obtained by subtracting M and L from that value are output.

(To) 2 Count values of the display time counter (11) and the display depth counter υ so that the memory contents in Figure 6 are displayed as shown in Figure 2 when reading the memory (C). This is an adder for determining the content of which address to read in response to the address, and in FIG. 6, when the count values of both counters α◇(2) are both O, one (c) outputs yl in the time direction, and the other adder (b) outputs xl in the depth direction. Note that these adders (B) (to) are negative or M-1 like the other adders)03 (sub) (to).
, L-1 or higher values are not output.

Next, in Fig. 6, the information erased part (the main part) is all from 0 to M-1 in the depth direction, but in the 2-time direction it is yl.
, from a to yl. Here, the counter (c) for writing in the 9-hour direction is an a-adic counter, so when the count value of this counter (c) is O, the adder (to)
It is preferable to output y□−a. Note that the adder (to) does not output a negative value or a value greater than L-1 to other adders, like the (to). In addition.

(b) is read-only memory for memory Q◇, O1
8) (A) are red, green, and blue D/A converters/amplifiers, respectively. In this way, in the first block circuit of FIG. 7, the first table hydraulic equation is displayed on the display screen of FIG.

As shown in FIG. 6, the coordinates are transformed based on the signal written in the memory Q2, and the time course of the detection signal is displayed as shown in FIG.

Φ) 1st table 2nd block circuit secondary for hydraulic formula 1st
The second block circuit that displays an image based on the surface hydraulic equation will be described, but before that description, the memory used in the second block circuit will be described. As shown in FIG. 10, the memory used for the second block circuit is arranged 26-1. It is a memory with a capacity of f pixels in the depth direction and g bits per pixel, that is, a total capacity of (20-1) x f x g. In particular, in Fig. 10, the memory for one transmission is It is shown.

In order to display an image using the hydraulic type shown in Table 1 using such a memory, a number corresponding to the number of times of transmission is required. for example,
In FIG. 2, there are five. Therefore, although the number of memories required increases, it is possible to selectively display only an arbitrary sector-shaped display part among the first to fifth sector-shaped display parts (S) to (S5) in FIG. I can do it. Finally, the second block circuit described below explains the hydraulic type in the first table, but the second block circuit explains the hydraulic type in the first table.
．． Display methods in which the scale factor changes, such as the method shown in Table 3, can also be applied by multiplying the count value of the depth read counter or the time read counter by the scale factor when reading from the memory. Furthermore, the memory may be erased on power up and does not need to be erased after every transmission as in the first block circuit.

Next, a second block circuit that uses the memory to display an image based on the first table hydraulic formula will be described.

FIG. 11 is a second block circuit diagram for displaying an image based on the first hydraulic formula, and parts corresponding to those in FIG. 7 are given the same reference numerals. The transducer (1), azimuth counter (4), frequency divider (5), distance counter (8), 9 display time counter αυ1 display depth counter (i )2 display direction setting device Q1
And regarding the coordinate converter 0v, etc.

A description of the second block circuit will be omitted.

In FIG. 11, symbols (211) to @S) are memories each storing received signals for five transmissions,
Among these memories, the first memory (21L1) always stores the latest information, and the fifth memory (2) does not store the oldest information;
~(2) stores signals while circulating according to the count value indicated by the quinary counter @6).

This quinary counter @6) converts the transmission trigger pulse output by the distance counter (8) into r5J r4J r8J r2
J rlJr5J r4J 17i3. It is counted in the order of J...

For example, when the count value is "2", the second memory (g)
(not shown).

The signal of the second memory (212) is displayed on the right end of the display screen of the color cathode ray tube α0, and the 8th memo! j (21B
) (not shown) is circulated and stored in each memory so that the signal is displayed to its left.

Note that the memory is in a write state when the level of the clock pulse from the clock pulse generator QO is high, and is in a read state when the level of the clock pulse is low or no clock pulse arrives.

The switch @7) is driven by a quinary counter @6), and for example, when the count value of the quinary counter @6) is "3", the clock pulse passing through the switch @8) is 5. Of the switching contacts (■) to (■).

Third memo through the switching contact (■)! J (218).

Switches (219-1) to (219-5) (However,
(219-2) to (219-4) are not shown) are for switching the writing and reading addresses of the first to fifth memories (2) to (215), respectively, and are clocks. Driven by clock pulses from pulse generator QO. Note that when the clock pulse level is high, the output of the coordinate converter 0η is used as the write address for each memo! J (211) to (215) are input. The display time setter (to) is the first to fifth memory (sub).
) to (2)5) When reading out the signals from 5) and displaying the signals on the display screen of the color cathode ray tube (c), normally the signals for 5 transmissions are displayed, but the signal for 1 transmission of these is displayed. This is for selecting and displaying the following signals.

That is, when the display time setting device (flash) is used to specify the number from the right of the two-display screen, only the second display is displayed. For example, the count value of the quinary counter (216) is “2”.
”, and if = 2, each switch (221t-1) to
(221-5), only the switch (221-8) is closed. In other words, the 9 display time setting device (f) is the stone el in Fig. 12.
It has a configuration surrounded by l. This display time setting unit (concave) has two display time setting units (220-1
) and an adder (220-2), and =2 is set in the 2-display time setting section (220-1).

The count value of “2” from the quinary counter @6) is transferred to the adder (
220-2), the adder (22'0-2)
From this, r2+2-1=34 summation outputs are derived. As a result, only the switch (221-8) is closed so that only the stored signal of the eighth memory @8) is displayed.

In FIG. 12, when the added value of the adder (220-2) exceeds "6", the value "l" obtained by subtracting "5" from that value becomes the added output of the adder. For example, if the added value of the adder (220-2) is "6", "1" becomes the addition output of the adder (220-2), and the switch (221-1) is closed and the first memory The stored signal of (sub)) will be read out.

(Iwao) (to)) is the first to fifth memory (2) to (2) according to the position on the display screen indicated by each count value of the 2 display time depth counter (2) and the display time counter 0.
In order to display the stored signal of 15) as shown in Figure 2, add the count values of both counters (2) αυ, respectively, and read out the first to fifth memories @1) to (2)). These are a depth direction read counter and a time direction read counter for creating an address. Now, in Fig. 2, the first fan-shaped display part (S□) is the third memo 'J (218
) is displayed based on the stored signal in the fifth fan-shaped display section (S5).
is the second memo! If the display is based on the memory signal of J (212), the upper right space (o, o) of each memory shown in FIG.
) on the display screen in FIG. 2 is as follows.

That is, the third memo! For the first fan-shaped display portion (Sl) by J (218), the coordinate (dt')s fourth memory @
Regarding the second fan-shaped display part (S2) according to 4), the gate sign (d-b, a), the eighth sector-shaped display part (S3) according to the fifth memory @5), the coordinates (d-2b, 2a), the As for the fourth fan-shaped display portion (S4) by 1 memory @1).

The coordinates (d-8b, 8a), and the coordinates (d-8b, 8a) for the fifth fan-shaped display portion (S5) based on the second memory (212).
4b, '4a).

Therefore, if the output of the 9-display depth counter (A) is XR, and the output of the 9-display time counter aυ is YR.

The read address of the eighth memory (218) is (xR-d
.

yR), and the read address of the fourth memory (214) is (XR-d+b, yR-a). In this way.

It corresponds to the right end on the display screen according to the count value of the quinary counter (46). That is, the memory of the latest received signal corresponds to the left end on one display screen of (xa-d, yu). That is, in the memory of the oldest received signal (XR-d+
4b, ya-4a), the depth direction read counter @2) and the time direction read counter (Fig.

It consists of a switching device.

Note that when the depth direction read address is subtracted and becomes negative, a value obtained by adding M to that value is output, and when the time direction read address is added and exceeds L, L is subtracted from that value. The subtracted value is now output.

Note that each of the memories @1) to (2)) in FIG. 11 is provided with comparators (a) (b) and switching IacSa) (sb) as shown in FIG. When a read address that does not exist is entered into memory.

Read-only memory for next-stage priority/color conversion, which will be described later @4
) outputs no signal. For example, the read address in the depth direction to the comparator (b) is 1 to M-1,
The time direction read address to comparator (a) is 2cmM
-1, the switch (Sa) (Sb) is driven and no signal is output to the priority/color conversion read-only memory 1 (224).

The priority/color conversion read-only memory (2) is used to perform 9-color conversion and to display new signals on the display screen preferentially over old signals.

Note that the priority order is determined by the count value of the quinary counter @6). In this way, the second block circuit is
An image can be displayed on the display screen of the color cathode ray tube QQ based on the hydraulic equation shown in Table 1. Furthermore, D/A
The conversion/amplification (to OI) is for red, green, and blue colors, respectively.

(e) 3rd block circuit for hydraulic formula in Table 1: The memory used in the 8th block circuit has a configuration as shown in FIG. Pixels, total of g bits per pixel N x f
It has a storage capacity of X g.

Remember. The third block circuit has the above-mentioned memory for the number of times of transmission, and performs operations such as coordinate conversion, shifting, and priority upon reading, and displays the data twice. The purpose of storing received signals in all directions is to instantly switch the display direction of the entire screen at any time using the 9-display direction setting device. □In this way, in the third block circuit.

Although the number of memories required increases, it is possible to selectively display only the fan-shaped display portion at any time, and also to display the passage of time in any direction.
Not only the surface hydraulic type but also all other display systems mentioned above can be supported.

Next, details of the eighth block circuit will be explained with reference to FIG. 15.

FIG. 15 is a detailed diagram of the eighth block circuit, and FIG.
Portions corresponding to those in FIG. 11 are given the same reference numerals. In addition, ultrasonic transducer (1), azimuth counter (4), 9 branch stations (5), distance counter (8) 9 display time counter Q
η9 display depth counter @9 display orientation setter OQ, quinary counter (216) #display time setter (en), switch (221-1) to (221-5), depth direction readout counter (2) )9 Hour direction reading counter (%
).

and read-only memory for priority/color conversion @A), etc. in 1. Since this is the same as the second block route, detailed explanation thereof will be omitted. Note that although the third block circuit has five sets of parts surrounded by parallel lines in FIG. 15, only one set is shown for the sake of convenience in two drawings.

In FIG. 15, the first to fifth memories (811) to (8
15) stores the received signals transmitted five times in correspondence with each other, but in storing the signals, each memory stores the signals while circulating according to the count value indicated by the quinary counter (216). do. In that case.

Each memory stores all signals regardless of display orientation, so
The storage capacity is Nxfxg, respectively, as described above.

Hereinafter, the circuit shown within the slope will be mainly explained.

In the comparison circuits (C1) to (05) (however, only the comparison circuit (C1) is shown in the second drawing. The same applies hereinafter), the comparison circuit (01) is compared with the count value of the quinary counter @6). Compare the human input with "1" and when the two match, that is, the count value of the quinary counter @6) is "1"
By deriving the comparison-dispersed output that drives the switch (8d1) only when the clock pulse (write pulse) from the clock pulse generator αQ is
), and the above-mentioned switch (SA) leads to the read/write terminal (R/W) of the .

It is also provided in each of the other comparator circuits (C2) to (C5), not shown.
815) to individually derive a comparison match output as described above.

Switches (5a1) to (Sa,) respectively switch the read and write addresses of the first to fifth memories (811) to (815) in response to clock pulses from the clock pulse generator αQ. . In addition, in 9 drawings.

Only the switch (8a) is shown; other switches (S) are shown.
a2) to (Sa,) are arranged in the same connection relationship and operate in the same circuit as the circuit surrounded by the accent.

Next, the first. The coordinate conversion in the second block circuit was to convert polar coordinates into rectangular coordinates, but in the eighth block circuit, rectangular coordinates are converted into polar coordinates using coordinate converters (dθ to (d5)). However, the reason why the coordinate converter (d ri ~ (tun)) is not shown in the second drawing is due to the same reason as above.

Note that this coordinate converter (di) to (ton) is 0 to f-12 indicated by the depth direction reading counter (to)) and θ to 28-2 indicated by the time direction reading counter (228).

That is, 0 to f-11 in the depth direction and θ to 2C in the time direction.
Consists of a read-only memory that stores which memory signal from depth 0 to f-1 corresponds to the display screen of -2 in the direction 0 to α (α=7 in Figure 2) in the memory. is,
Specifically, it has a configuration as shown in FIG.

Also, 0 to f indicated by the depth reading counter (swimming)
-1 and time direction readout θ~ indicated by %)
20-2, there is no memory of the corresponding orientation and depth, that is, the shaded area in FIG.
Numerical values other than O to α for the orientation and 0 to f-1 for the depth are stored in the coordinate converters (dl) to (d6).

Further, the coordinate converters (di) to (d5) store directions of 0 to α. Therefore, when the display orientation is n.

Since it is necessary to display n − n + α, addition A) ~
Add n according to (A5). Furthermore, a coordinate transformer (d
, ) to (d,), where there is no corresponding memory, numerical values other than 0 to f-1 are stored in the distance/direction, so the comparative human power is a numerical value other than o -f -1. When inputted manually to the comparators (al) to (-), the switches (Sb) to (Sb5) are driven so that no signal is output from the color cathode ray tube αQ#. Also, in the same way as above, when a value other than 0 to α is input from the coordinate converters (dl) to (d5) to the comparators (bl) to (b5), no signal is output to the cathode ray tube. Switch (Sbi) ~ (8bs
) is driven. In addition, in FIG. 15, the comparator (aθ(
bl) Switching device (sb□) (Se1) The reason why only 1 is shown is for the same reason as mentioned above.

In this way, the image (FIG. 2) based on the first table hydraulic equation is displayed on the display screen by the third block circuit.

In addition, although the above-mentioned embodiment shows an example using a full-circle type scanning sonar, a half-circle type scanning sonar may be used. In addition, since the image is displayed in a fan shape in the above embodiment, for example, if the seabed is flat, it will be displayed in an arc shape, so even if you change the image display format so that the flat seabed is displayed flatly. good. Therefore, the coordinate transformation for this purpose may be performed, or the coordinate transformation may not be performed at all. Table 8 In the hydraulic system, the old received signal is reduced compared to the new received signal. By the way, in the 1st block circuit, the 2nd and 8th table hydraulic equations cannot be applied, but in the 2nd and 8th block circuits, the depth direction reading counter @2) and the time direction reading counter (%) cannot be applied. The received signal can be reduced by multiplying the output by a scale factor according to the count value of a quinary counter (2).For example, if the scale factor is p.

For the first fan-shaped display portion (Sl) in FIG. 2, set pl for the adjacent second fan-shaped display portion (S2).

For the fifth fan-shaped display portion (S5), C5 may be multiplied by 9. Further, in the second surface water type, the distance a between the fan-shaped display portions may be changed in accordance with a change in the scale factor.

As explained above, according to one aspect of the present invention, detection results in a wide range of directions are displayed on a display.

The reflected waves returning from the desired range direction are selected, and the time course of the selected detection signals is displayed on the display, so the detected object is displayed in a mosaic pattern or is mixed with noise. It is no longer difficult to distinguish between objects, or small objects are displayed as dots and blinking due to the movement of the ship, etc., making it possible to clearly identify the detected object. In particular, it is possible to control the movement of the detected object. can be accurately and easily grasped without relying on one's memory. especially.

According to the present invention, since the time course of continuous detection signals in multiple directions is displayed, the time course in multiple directions can be easily seen, connections with adjacent directions can be easily seen, and pseudo-stereoscopic display is possible. The display is easy to understand by
By storing the detection signals for each transmission in the memory, effects such as being able to select and display detection signals in any direction at any time at any time can be achieved.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a schematic diagram of a display screen, and FIG. 2 is a diagram showing an image displayed by the first surface water method. Figure 4 is a diagram showing an image displayed by the second display I) method, Figure 4 is a diagram showing an image displayed by the third table water method, and Figure 5 is a diagram showing an image displayed by the fourth table water method. Figure shown. Fig. 6 is a schematic diagram for explaining the memory configuration used in the first block circuit, Fig. 7 is a first block circuit diagram based on the first table water type, and Fig. 8 is a time series of ultrasonic transducer 9. A diagram showing a circuit and an A/D converter, FIG. 9 is a configuration diagram of a coordinate converter, and FIG. 10 is a schematic diagram for explaining the configuration of the memory used in the second block circuit and the coordinate converter of the third block circuit. FIG. 11 is a second block circuit diagram based on the first surface water type. FIG. 12 is a configuration diagram of the display time setter, FIG. 18 is a diagram of the memory in the second block circuit and the memory operation auxiliary circuit,
FIG. 14 is a schematic diagram for explaining the configuration of a memory used in the third block circuit, and FIG. 15 is a circuit diagram of the eighth block. (1)...Ultrasonic transducer, (2)...Time series circuit, (3)...Transmission circuit, (4)...Azimuth counter,
(5)... Brancher, (7)... A/I) converter, (
8) Distance counter, (9) Display range setter, 0 clock pulse generator, (l]) Display time counter, (2) Display depth counter ,
Ql...color cathode ray tube, Ql)...display orientation setter, αη...adder. (To)...Comparison circuit, (C)...Memory, (B)...
... Flip-flop for information erasure, (2) ... Counter for writing in the depth direction. (c)...Time direction writing counter, @(c)・
...Latch circuit, 翰(to)...Adder, 0η...coordinate converter, @(to)<34(to)(to)...adder t
@1) (215)...Memory, (2))...5
Advance counter, (2))...display time setter, (2).
・・Read-only memory for priority/color conversion, (z)・
...Counter for reading in the depth direction, (of course)...Counter for reading in the time direction. (all)...Memory, (al)...Coordinate converter patent applicant Furuno Electric Co., Ltd. agent Patent attorney Oka 1) Hide Kazu Figure 1 Figure 2-! -Yūjōgen Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claim] In a display device for an underwater detection device that displays detection signals from a wide range of directions, means for selecting detection signals from a plurality of directions from among the detection signals. It includes a memory for storing detection signals from a plurality of directions selected by the selection means for each transmission, and a means for displaying on a display the time course of the detection signals for each transmission read out from the memory while being shifted on a display. A display device in an underwater detection device characterized by: