JPS6235630B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a collision prevention system using a radar device as a sensor, which observes a target, calculates its speed and course, and calculates the speed of the target obtained thereby. The present invention also relates to a moving target display device that displays vectors on a CRT (cathode ray tube) display screen based on course information.

In this type of device, the movement of the target is
It is usually expressed as a straight line, ie, a vector, connecting the current position of the target captured by the radar device on the display screen of the CRT display and the predicted position that the target will reach after a predetermined period of time has elapsed.

The speed of the target obtained by calculation from the change over time of the target is usually referred to as a "not", but when displaying the vector as described above, it is used as a vector when changing the measurement distance range of the radar device, that is, when changing the range. , the time base should be made variable so that the optimum distance can be selected according to the situation in many cases when the distance corresponding to the unit of "knot" per hour is too long. is desired.

Therefore, you can set the time base to 3 minutes, 6 minutes, 10 minutes, etc.
It is configured so that it can be changed in steps such as minutes, 15 minutes, 30 minutes, 60 minutes, etc., so that it can be selected arbitrarily for operational purposes.

In other words, normally the time base is set small and the vector length is displayed short for observation, and if necessary, the time base is enlarged to match the desired future position (for example, the intersection with another vector) and the time By reading the base, various applications such as obtaining the time to reach the future position become possible.

However, as mentioned above, the time base is 3
You can only choose from several options such as minutes, 10 minutes, etc.
〓〓〓〓〓
On the other hand, in actual applications, situations are diversified and the time base may not be optimal. Therefore, a continuously variable device that can be set optimally in any case is desired.

The present invention has been made in view of the above circumstances, and it attaches a vector indicating the speed and direction of the target to the echo of the target displayed on the radar device based on speed information and course information obtained from observation of the target. A vector length adjustment device that changes the output voltage in accordance with the set time of a time setter that can be set continuously, and a vector length adjustment device that multiplies the output voltage of this device by the speed information and calculates the multiplied value. It consists of a device that outputs as an analog output, and a device that compares a predetermined sawtooth wave voltage and this multiplication value output and detects a point where the two match, until the sawtooth wave voltage reaches the multiplication value output level from its zero point. An object of the present invention is to provide a moving target display device that can display vectors on an arbitrary time basis by displaying vectors during the time period.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this device, and numeral 1 in the figure is a latch circuit for latching speed information of a target. This speed information is the echo (reflected wave) of the target captured by a radar device (not shown).
is obtained by processing with a computer (not shown),
Numerical data is stored in a storage device in this computer, and is applied from the storage device in the computer to the latch circuit 1 via a data bus.
latches the speed information. 2 is a display range switcher for setting the display range of the radar device; 3 is a division circuit for dividing the contents latched in the latch circuit 1 according to the set value of the display range switcher 2; for example, the display range switcher 2; The value after division when the set value of the range switch 2 is in the "6" mile range is set to be 1/2 of the value in the "3" mile range. 4
is a time base setting circuit that sets a time base that is a desired future point, and in practical terms
It is a continuously variable type that can set any time between hours, and outputs a DC voltage corresponding to the set time. 5 uses the output of this time base setting circuit 4 as an analog input, and uses the numerical data after division output from the dividing circuit 3 as a digital input, and multiplies both inputs to obtain a voltage proportional to the speed and the time base. 6 is a sawtooth wave generation circuit that generates a sawtooth wave output that changes from zero volts to a predetermined level with a predetermined slope; 7 is a combination of this sawtooth wave output and the multiply D/A converter; A comparator which takes the output of the converter 5 as an input and compares the two and outputs a signal until they match. 8 is a gate circuit that opens and closes the output of the comparator 7. 9 is a gate circuit.
This is a CRT display, and the output of the comparator 7 obtained through the gate circuit 8 is obtained as a luminance signal. 9Y is a Y-axis deflection coil of this CRT display 9, 9X is an X-axis deflection coil, and 10 is an X that supplies a deflection current for X-axis deflection to this X-axis deflection coil 9X.
An axis sweep circuit 11 connects the Y-axis deflection coil 9Y to the Y-axis deflection coil 9Y.
This is a Y-axis sweep circuit that provides a deflection current for axis deflection.

These X- and Y-axis sweep circuits 10 and 11 process the target's echo with a computer and output X- and Y-axis deflection signals based on the course information obtained together with the speed information, and the course information is divided into X and Y components. The X component is calculated separately and stored in a storage device in the computer, and from this storage device, the X component is sent to the X-axis sweep circuit 10.
Then, the Y component is given to a Y-axis sweep circuit 11, and these X and Y-axis sweep circuits 1
X axis, Y axis as shown in Figure 2 a, b within 0,11
Create a sweep waveform for the axis.

Next, the operation of this apparatus having the above configuration will be explained.

The echoes of the target captured by a radar device (not shown) are processed by a computer (not shown), and the speed and course information of the target is obtained numerically and stored in a storage device within the computer. The course information is divided into X and Y components, and the X component is sent to the X-axis sweep circuit 10.
Further, the Y component is given to the Y-axis sweep circuit 11. As a result, the X-axis and Y-axis sweep circuits 10 and 11 generate X-axis sweep outputs and Y-axis sweep outputs as shown in FIG. , to the Y-axis deflection coil 9Y. As a result, deflection currents flow through the X- and Y-axis deflection coils 9X and 9Y, respectively, and the CRT display 9
As shown in Figure c, it is deflected by an amount x in the X-axis direction and y in the Y-axis direction, forming an angle of θ (tanθ=y/x) with the X-axis.
It is swept in the direction v to show the course v.

On the other hand, speed information is sent from the storage device in the computer to the latch circuit 1 through the data bus. Then, it is latched by this latch circuit 1. This latched speed information is taken into a division circuit 3, and this division circuit 3 divides the speed information by a ratio corresponding to the display range of the radar device set by the display range switch 2. The value after this division is given to the digital input side of the multiplying D/A converter 5, and this multiplying D/A converter 5
The output of the time base setting circuit 4 is applied to the analog input side of the A converter 5. The time base setting circuit 4 is a circuit for setting a desired future time, and generates a DC output corresponding to the set time.
The multiplication D/A converter 5 multiplies these two inputs and outputs a voltage LV proportional to the speed and time base. The voltage obtained in this way corresponds to the value obtained by further multiplying the speed information, which has been corrected at a rate corresponding to the set value of the display range, by the time base. Therefore, this voltage corresponds to the current value. This corresponds to the distance traveled by the target on the CRT display 9 between the time and the desired future time.

This voltage output is given to a comparator 7, which outputs a predetermined sawtooth wave output with a slope that can display a display corresponding to a distance on the CRT display 9 display surface determined by the speed information and the display range and time base of the radar device. S (S is constant,
The above three elements may be corrected according to S) are obtained from the sawtooth wave generation circuit 6 and compared.
This situation is shown in FIG. 3a. Then, as shown in FIG. 3b, a signal of a predetermined level is output until the two match. The time width t is proportional to the speed and the time base.

The output of this comparator 7 is given to a CRT display 9 via a gate circuit 8 as a luminance signal.

In this way, a vector is displayed on the CRT display 9 in the direction v for a time t, as shown in FIG. 2c.

As mentioned above, the time t is proportional to the speed of the target and the time base, and has been corrected in accordance with the display range setting value of the radar device.
In addition, in the CRT display 9, the deflection currents of the aforementioned X- and Y-axis deflection coils 9X and 9Y are given values corresponding to the course information, and the deflection currents are set so that they are swept at an angle of θ with respect to the X-axis. Because it has been
The CRT display 9 shows a vector that points in the direction of the target's course and that extends from the current display position of the target to the expected position on the CRT display 9 when a time equivalent to the time base has elapsed in accordance with the speed of the target. It will be displayed.

This vector length is related to the time base set by the time base setting circuit 4 which can be continuously variable, that is, the desired future time value, so by changing the set value of the time base setting circuit 4, the desired value can be set. This allows for various applications such as knowing the positional relationship with the target at the desired elapsed time, the possibility of collision, the time required to reach the target, etc. Benefits such as good performance can be obtained.

In this way, speed information and course information are calculated by observing the target displayed on the radar device, and the direction is given according to the course information, and the travel distance is given based on the speed information and the set time, and displayed on the display device. A device for correcting the speed information in accordance with the display range of the radar device, and a continuously variable setting time. A device that changes the output voltage in accordance with the setting time of the setting device, a device that generates an output that corresponds to this output voltage and the corrected speed information, and a device that corresponds to the moving speed of the target and the display range of the radar device. a device that generates a sawtooth wave output with an inclination necessary to determine the travel distance, and a device that compares the output voltage and the sawtooth wave output, generates an output until the two match, and provides the output as a brightness signal to the display device. If you set the desired time base with a continuously variable time setter, a vector extending to the expected position after the elapse of time for that time base will be displayed. To provide a moving target display device for a radar device that is capable of knowing the relationship with a target and displaying the length of a vector to a required length, has good operability, and is easy to use in various applications. I can do it.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but may be modified without changing the gist thereof.
It can be implemented with appropriate modifications.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of this device, Figure 2 is a block diagram showing the configuration of this device.
Figures a, b, and c are diagrams for explaining the deflection output of x and y components corresponding to course information and the sweep direction represented by these, and Figures a and b are diagrams for explaining the operation of the comparator. be. 1...Latch circuit, 2...Display range switch, 3
...Division circuit, 4...Time base setting circuit, 5...
...Multiple D/A converter, 6...Sawtooth wave generation circuit, 7...Comparator, 8...
Gate circuit, 9...CRT display, 9X...X-axis deflection coil, 9Y...Y-axis deflection coil, 10...
X-axis sweep circuit, 11...Y-axis sweep circuit. 〓〓〓〓〓

Claims (1)

[Claims] 1 Observe the target captured by the radar device, analyze the data obtained from this, obtain speed information and course information, and determine the direction according to the course information.
Further, in a device in which the display range of the image is given based on speed information and a set time, and a vector indicating the speed and direction of the target is displayed on the echo of the target displayed on the display device, the display range of the radar device is a device for correspondingly correcting the speed information; a device for changing an output voltage corresponding to a set time of a time setter capable of continuously variable setting; and a device corresponding to the output voltage and the corrected speed information. A device that generates an output, a device that generates a predetermined sawtooth wave output, and a device that generates a predetermined sawtooth wave output, compares this sawtooth wave output with the output voltage, and generates an output until the two match, thereby determining the length of the vector. A moving target display device comprising: a device for determining a moving target;