JPS61284688A - Doppler underwater speed measuring instrument - Google Patents

Abstract

PURPOSE:To analogize the underwater speed at the depth in addition to a measuring layer as well from the displayed layer by three-dimensionally displaying the underwater speed of multiple layers. CONSTITUTION:The signal for setting optional three layers of measuring depths is inputted to a CPU4 via an interface circuit 7 by a panel switch 8 and is stored in a RAM6. Said signal is outputted to a signal processor 1 via an interface circuit 3. The current directions and flow rate values of the three layers are calculated from the waves reflected from the sea bottom and the sea inside and gyro signals in the processor 1 and are inputted via the circuit 3 to the CPU4 which stores the values into the RAM6. The information on a flow rate scale is inputted as the set value of the switch 8 into the CPU4 via the circuit 7 and is stored in the RAM6. The CPU4 reads the current direction, flow rate and flow rate scale out of the RAM6, determines of the scale of the elliptical display, the major axis and minor axis of the ellipse and the end point coordinates of vector and three-dimensionally displays 10 the same via a display conversion circuit9. The underwater speed at the depth except the measuring display layer can be thus analogized from the displayed layer.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention measures and displays the underwater speed of an underwater moving object based on the Doppler effect generated in the reflected waves that emit ultrasonic waves from a ship into the sea and reflect from the seabed or the sea. Regarding equipment.

(Prior Art) In a conventional measurement display device of this type, a signal processor generates pulses, supplies the pulses to a transducer, and emits an ultrasonic signal from the transducer toward the ocean floor. seabed and fish schools,
The reflected waves reflected by plankton and the like are received by the transducer again, converted into electrical signals, and input to the signal processor.

Based on this electrical signal, the velocity (velocity and direction) of underwater moving objects such as schools of fish relative to the seabed is measured and processed. In this case, the underwater speed has conventionally been displayed numerically or as a flat vector.

(Problems to be Solved by the Invention) For this reason, when there are multiple measurement layers, it is difficult to determine the behavior in the depth direction, and it is difficult to convert the underwater velocity t of intermediate layers other than the measurement layer. It was difficult.

Also, because the flow velocity alarm range and underwater velocity were not displayed simultaneously, it was not easy to compare the flow velocity indication value and the flow velocity alarm set value.

(Means for Solving the Problems) In order to eliminate these drawbacks, the present invention provides means for setting measurement depths for arbitrary multiple layers, storing the set values, and specifying them to a signal processor. means, means for calculating flow direction and flow velocity values in an absolute orientation system, set multilayer flow direction,
Memorize the flow velocity value, + is the scale of the circle display and the major axis of the ellipse.

Using the arithmetic processing means of the central processing unit that calculates the coordinates of the short axis and the end point of the vector, it is possible to three-dimensionally display the underwater velocity of multiple layers, other than the measurement layer (example). Figure 1 shows one embodiment of the present invention. In the example block diagram.

1 is the signal processor of the underwater speedometer, and 2 is the transducer.

1 and 2 constitute an underwater speedometer. 3 is the flow direction.

Flow velocity interface circuit, 4 is a central processing unit (hereinafter referred to as C
5 is a first memory circuit (hereinafter referred to as ROM)
, 6 is a second memory circuit (hereinafter referred to as RAM), 7 is a panel input interface circuit, 8 is a panel switch, 9 is a display conversion circuit, and 10 is a cathode ray tube display, and 3 to 10 are underwater speed display devices. Configure.

Next, the operation of the apparatus of the present invention will be explained with reference to the display example shown in FIG. First, pulses generated by the signal processor 1 of the underwater speedometer are supplied to the transducer 2, and the transducer 2 emits, for example, four ultrasonic signals diagonally downward toward the seabed. Reflected waves reflected by schools of fish, plankton, etc. on the seabed and in the sea reach the transducer 2 again, are converted into electrical signals, and are input to the signal processor 1. Based on this electrical signal, the speed (velocity and direction) of underwater moving objects such as schools of fish relative to the seabed can be measured and calculated, as disclosed in Japanese Patent No. 805192.
It is known for its method of detecting the moving speed and direction of fish schools.

In general, reflective objects such as schools of small fish and plankton are not moving, or even if they are moving, they are moving at very small speeds, so they are considered to be moving with the tidal currents. Furthermore, since it is thought to be widely distributed from the upper to the lower layers of the ocean, by measuring the underwater speed of a moving object at a given depth, it is possible to know the current direction and current velocity at a given depth.

The present invention allows the underwater speed display device to have any 3
A signal for setting the measurement depth of the layer is input to the CPU 4 via the panel input interface circuit 7, and the RA
At the same time as storing it in M6.

One of the features is that it is output to the signal processor 1 via the flow direction/flow speed interface circuit 3.

These three arbitrary layers are, for example, an upper layer of 10 m, a middle layer of 50 m, and a lower layer of 1.
00m. As described above, the signal processor 1 calculates the current direction and current velocity values of the three layers from the reflected waves reflected on the seabed and under the sea and the gyro signal input to display the current velocity in the absolute azimuth system. , flow direction, and are output to the 1N-speed interface circuit 3. The CPU 4 controls the flow direction and the flow direction of the three layers from the flow rate interface circuit 3.

Input the flow velocity value and store it in RAM6. In addition, information on the flow velocity scale is inputted to the CPU 4 via the panel input interface 7 ace circuit 7 as a setting value of the panel switch 8,
Store in RAM6. This value is on the cathode ray tube display 10
This determines the length scale of the long axis of the ellipse displayed above.1 For example, each of the three layers is 2 knots 15 cm,
The settings are as follows: 5 knots 15 cm, 10 knots 15 cm. Based on these values, the CPU 4 determines the coordinates of the long sleeve, short axis, and end point of the vector of the ellipse to be displayed one time, and outputs the coordinates to the one display conversion circuit 9. These series of processing programs are R
The program is stored in the OM5, and the CPU 4 sequentially reads and executes the program.

Input/output and arithmetic processing are performed.

Next, from the flow direction, flow velocity, and flow velocity scale.

A method for determining the long axis, short axis, and end point coordinates of the ellipse will be explained with reference to FIG. 3. Flow direction TA, flow rate RA
i, expressed by a concentric circle Ci' with true north N on top and a vector OPi, and if the major axis P of the ellipse Ov is equal in length to the flow velocity RA, and the minor axis q is 1/3 of the major axis P, then the ellipse Ov The formula is expressed below.

Here, the N-8 axis, ky axis, and W-E axis are assumed to be the X axis.

Therefore, the coordinates of the intersection point p1 (X++3'υ) between the perpendicular drawn from one point P2 to the X axis and the ellipse Ov are expressed by the following formula. This vector calculation distance represents the flow direction TA in the ellipse representation.

x r=x o+P , s 1nTAy Y r=”
! ofq cosjA The values of the long axis p+, the short axis q+, and the intersection Pl(x++3'+) necessary for actual CRT display can be obtained for the upper layer by the following formula, taking into account the flow velocity scale ΔV.

Although the above describes one upper layer.

Similarly, for the other two layers (middle and lower layers), find the long axis, short axis, and vector end point coordinates, respectively.

It is output to the display conversion circuit 9. The value of the X-axis at the center coordinate 0 of the ellipse is output as a value corresponding to the measured depth of each layer. The display conversion circuit 9 is.

Based on these values, it is converted into a video signal for drawing finger circles and vectors and output to a 1° cathode ray tube display. As a result, the underwater velocity ellipse a and vector b as shown in FIG. 2 are displayed on the cathode ray tube display 1°. What is the underwater speed of the three layers?

They are carried from top to bottom in order from shallowest to lowest at intervals corresponding to the measured depth. For example, the upper layer is 10m and the middle layer is 5m.
0m and the lower layer is 100m, the ratio of the distance between the upper and middle layers and the distance between the middle and lower layers is 4:5. This makes it easier to understand the concept of depth.

Moreover, the ellipse a and vector b of the layer with the largest flow velocity RA are displayed above the three ellipses, and the vectors of other layers are also displayed, making it easier to understand the relationships on the plane. Furthermore, the relative speeds of the other two layers with respect to a certain layer can also be displayed as a dotted line vector C. If the flow direction TA + flow velocity R of each layer is displayed in different colors, it will be easier to see.

Further, the CPU 4 inputs information from the panel switch 8 via the panel input interface circuit 7.

The flow velocity alarm range is determined and output to the two-display conversion circuit 9.

As a result, a red bar graph d is displayed on the cathode ray tube display 10. In the example in Figure 2, 1.5 knots
s becomes the alarm range, and if the flow velocity becomes 1.5 knots or more in any one of the three layers, an alarm buzzer will sound.

In addition, the flow direction and flow velocity values of each layer are displayed numerically in the empty space e. The measurement depth of each layer is 10m and 50m in the "Depth" column.
, 100m, but in the "flow velocity" column it is 0.8kn, 0.
6kn, 0.4kn, and E in the "flow direction" column.
SE (112°), NE (45°), and N (0°).

Displayed corresponding to each layer.

(Effects of the Invention) As explained above, the present invention is capable of three-dimensionally displaying underwater velocities in multiple layers, so that the underwater velocities of layers other than the measurement display layer can be inferred to some extent from the two displayed layers.

This kind of display makes it easy to imagine the line structure when setting a line on a purse seiner, and it also shows the efficiency in fishing. The warning function is expected to help prevent net breakage due to excessive speed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a plan view of figures and information displayed on the CRT display screen, and FIG. 3 is an explanatory diagram of ellipse and vector calculation.

Claims (1)

[Claims] In a device that emits an ultrasonic signal underwater and measures the underwater speed of an underwater moving object, etc. from reflected waves from the seabed and underwater and a gyro compass signal, a means for setting measurement depths for arbitrary plural layers; A means for storing set values and specifying them in the signal processor of the underwater speedometer, a means for calculating flow direction and flow velocity values in the absolute azimuth system, a means for memorizing the set multilayer flow direction and flow velocity, and a scale and ellipse display. long axis of the ellipse,
The calculation means of the central processing unit that calculates the coordinates of the minor axis and the end point of the vector displays the flow velocity as the size of the ellipse and the flow direction as the vector direction from the center of the ellipse, superimposed in the depth direction in multiple layers.At the same time, the warning range of the flow velocity is displayed. A Doppler underwater velocity measurement device characterized by displaying.