JPH0262834B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a radar device for transmitting ship information, which mutually transmits ship codes, traveling speeds, headings, etc. of own ships between ships. Traditionally, large numbers of fishing vessels have been working together to improve fishing efficiency. In such cases, there is a risk of collision between ships due to barge conditions at sea, fishing boats approaching each other, etc., and radar devices have been widely used to prevent such dangers. However, the information obtained by radar equipment is simply the relative position of other ships with respect to one's own ship, and when ships are approaching each other or there are a large number of ships as described above, the movement of other ships becomes important. However, there is no such function, and so-called collision prevention devices that have such a function are extremely expensive. Furthermore, in a radar device that transmits radio waves and receives waves reflected from a target object, accurate detection is difficult due to the strong influence of waves reflected from the sea surface, especially when detecting a target object at a short distance. The present invention has been made in view of the above, and each ship has a radar device for transmitting and receiving waves, and transmits information regarding own ship code and own ship's speed and direction at transmitting intervals. A radar for ship information transmission that transmits pulse waves from a wave transmitting radar device by changing the pulse wave, and receives the pulse waves with a wave receiving radar device of another ship to detect and display the above various information of the transmitting ship. It provides equipment. The present invention will be described below based on embodiments shown in the drawings. Figure 1 shows two fishing boats 1a and 1b in operation.
2b shows a wave transmitting antenna of a wave transmitting radar device of the fishing boat 1a, and a wave receiving antenna of a wave receiving radar device of the fishing boat 1b. In the following explanation, the wave receiving radar device of the fishing boat 1a and the wave transmitting radar device of the fishing boat 1b will be omitted. Below, the explanation will be divided into wave transmission and wave reception. (1) Wave transmission operation (see Figure 2) As mentioned above, all types of fishing boat information are determined by the wave transmission interval. This transmission is repeated using the first to third pulses, T ₀ is the time from the first pulse transmission to the second pulse transmission, and T ₁ is the time from the second pulse transmission to the third pulse transmission. Let _T2 be the time from the third pulse transmission to the first pulse transmission. Here, T ₀ is the preset fishing boat 1a
This is the ship code, which has slightly different values for each ship. T ₁ is a value corresponding to the traveling direction of the fishing boat 1a, and is determined according to the heading information obtained by the onboard gyroscope 3.
It is obtained by converting into the value _T1 in ROM4. T ₂ is a value corresponding to the traveling speed of the fishing boat 1a,
For example, it is obtained by converting into the value _T2 in the ROM 6 according to the moving speed information obtained by the ship speedometer 5 that uses the Doppler effect. Furthermore, in order to enable identification of each pulse, the above-mentioned intervals T ₀ , T ₁ , and T ₂ are predetermined so that the relationship T ₀ <T ₁ <T ₂ is always maintained. For convenience of explanation, each transmission interval T ₀ , T ₁ ,
Let the time unit of T ₂ be μs. Therefore, for example, the above relationships are 0<T ₁ <200, 200<T ₁ <400, 400<T ₂ <
It will be like 600. Now, 7 is a clock pulse generation circuit which sends out a pulse train with a period of 1 μs, and this clock pulse is counted by a counter 8 and guided to a comparator circuit 9. The comparator circuit 9 receives the wave transmission interval value sent via any one of the changeover switches 12, 13, and 14, which are connected based on a ternary counter 10 and a changeover control circuit 11, which will be described later, and the counter 8. When the count values of 2 and 3 are compared, a matching pulse is sent out. Then, the coincidence pulse is detected by the ternary counter 10.
is sent to change the output count value from 0 to 1, or from 1 to 2, or from 2 to 0. Based on the output count value, the switching control circuit 11 connects the changeover switch 12 when the output count value is 0, the changeover switch 13 when the output count value is 1, and the changeover switch 14 when the output count value is 2. . Therefore, the output count value of the ternary counter 10 is now 0 due to the sending of the coincidence pulse.
If so, the changeover switch 12 is connected and the value T ₀ is introduced to the comparator circuit 9. On the other hand, the count value of the counter 8 is reset to 0 by the coincidence pulse, and the counting operation is started again. and,
When the count value matches T ₀ (T ₀ (μs) after the coincidence pulse is sent out), the transmitted coincidence pulse is guided to the counter 8 and the ternary counter 10, as well as to the transmitting circuit 15 and sent to the transmitting antenna. It is transmitted as a radio wave pulse from 2a. Furthermore, the count value _T0 of the counter 8 is reset to 0 by the coincidence pulse at this time, and the output count value of the ternary counter 10 is changed from 0 to 1. Therefore, the changeover control circuit 11 connects the changeover switch 13, and the output value T ₁ of the ROM 4 corresponding to the heading information at that time is set.
is led to the comparison circuit 9. Then, after T ₁ (μs) when the count value of the counter 8 matches T ₁ , a coincidence pulse is sent out, and a radio wave pulse is transmitted based on the coincidence pulse. Thereafter, by sequentially repeating the above-described operations, radio wave pulses are repeatedly transmitted in the order of transmission intervals T ₀ , T ₁ , and T ₂ . Note that the above T ₁ and T ₂ change depending on the traveling direction and speed of the ship at each time. Reference numeral 16 denotes a motor for rotating the wave transmitting antenna 2a at a constant speed, and the rotation allows ship information to be transmitted in all directions around the own ship. (2) Regarding wave reception operation (see Figure 3) The direction setter 17, DA conversion circuit 18, comparison circuit 19, amplifier circuit 20, servo motor 21 and potentiometer 22 connect the wave reception antenna 2b to the fishing boat 1a. This is a circuit for directing it in the direction of. The direction angle of the fishing boat 1a relative to the fishing boat 1b is automatically or manually set in the azimuth setting device 17 by a normal radar device (not shown) mounted on the fishing boat 1b or directly observed. Then, the above set value is determined by the potentiometer 2 corresponding to that direction.
D-A conversion circuit 1 to match the output voltage of 2.
8, it is converted to an analog voltage, and the comparison circuit 19 -
guided to the input end. Incidentally, when the direction setting device is the same potentiometer as the potentiometer 22, the D-A conversion circuit 18 is not necessary. At the other input end of the comparison circuit 19, there is a potentiometer 22 corresponding to the directivity direction of the receiving antenna 2b at that time.
voltage is sent. Then, the voltage difference between the two is amplified by the amplifier circuit 20, and the servo motor 21 rotates the wave receiving antenna 2b in a predetermined direction until the voltage difference becomes zero. In this way, the wave receiving antenna 2b can be directed toward the azimuth value set by the azimuth setting device 17, that is, in the direction of the fishing boat 1a. Now, when the receiving antenna 2b is directed in the direction of the fishing boat 1a, the radio wave pulses with the transmission periods T ₀ , T ₁ , T ₂ from the above-mentioned wave transmitting antenna 2a are received by the receiving antenna 2b. be done. Therefore, as shown in Fig. 5a, the radio wave pulses being received now are...P ₁ ′,
P ₂ ′, P ₃ ′, P ₁ , P ₂ , P ³ , P ⁰ ₁ ... (However, the received pulses corresponding to the first transmitted pulse are P ₁ ′, P ₁ , P ⁰ ₁ ,
The received pulse corresponding to the second transmitted pulse is P ₂ ′,
P ₂ and the received pulses corresponding to the third transmitted pulse are P ₃ ' and P ₃ ). The reception intervals of each reception pulse are T ₀ , T ₁ ,
It can be regarded as T ₂ . Reference numeral 23 denotes an amplification circuit for amplifying the above-mentioned received pulse. The amplified received pulse signal is compared with a reference level v in a next-stage comparison circuit 24, and only signals having level v or higher are extracted. This reference level v is set in advance so that the number of extracted pulses is at least three in order to detect the transmission intervals T ₀ , T ₁ , and T ₂ , but a smaller number is preferable in terms of circuit operation. In this embodiment, as shown in FIG. 5B, a total of five elements are extracted: P ₁ , P ₂ , P ₃ and P ₃ ' and P ⁰ ₁ at both ends thereof. In other words, due to constant speed rotation of the wave transmitting antenna 2a, extraction is performed only within a minute time when the pointing direction overlaps with that of the wave receiving antenna 2b. The extraction pulse b extracted in this way is sent to the ternary counter 25, and the output count value is changed to 0, 1, 2, etc. each time it is sent.
Change it to 0, 1, 2, etc. Then, based on the output count value, the switching control circuit 26 switches the changeover switch 27 when the output count value is 0, and when the output count value is 1.
When the output count value is 2, the changeover switch 28 is connected, and when the output count value is 2, the changeover switch 29 is connected. For convenience of implementation, 30 sends out a pulse train with a period of 1 μs, similar to the clock pulse generation circuit 7 on the transmitting side described above. (FIG. 5c) In the clock pulse generation circuit, the clock pulses are counted by a counter 31 and guided to latch circuits 32, 33, and 34. Further, the extraction pulse b is also sent to the delay circuit 35, delayed by about 1/4 cycle of the clock pulse C, and guided to the changeover switches 27, 28, 29, and serves as a latch pulse for the latch circuit. , for example 1/
It is guided to the counter 31 with a delay of about two cycles, and the counted value at that time is reset to zero. This is to accurately guide the latch pulse to the latch circuit after the changeover switch is connected, and to reset the output count value of the counter 31 to 0 after it is latched to the latch circuit. Now, for the sake of explanation, the value of the latch circuit 32 is
Assume that T ₀ is latched, therefore, the value T ₁ is latched in the latch circuit 33, and the value T ₂ is latched in the latch circuit 34. In other words, the extraction pulses P′ ₃ and P ₃ cause the ternary counter 2 to
The output count value of 5 changes to 1, and the extraction pulse P ₁ ,
P ⁰ ₁ changes the output count value to 2, and the extraction pulse
The output count value changes to 0 due to P ₂ (Fig. 5e). The latch value of each latch circuit 32, 33, 34 is guided to ROM 39, 40, 41 via one of changeover switches 36, 37, 38, respectively. In this embodiment, the latch value _T0 of the latch circuit 32 is ROM
39, the latch value _T1 of the latch circuit 33 is stored in the ROM4.
0, and the latch value _T2 of the latch circuit 34 becomes
The data is sent to the ROM41. The comparison circuit 42 and the switching control circuit 43 are connected to the switching switch 3 for the above-mentioned feeding.
This is a circuit that switches and connects 6, 37, and 38. Note that the information to be extracted is always the value after the value T ₀ .
T ₁ is followed by the value T _{2 and} after the value T ₂ is the value T ₀
Since the order is as follows, the comparison circuit 42 and the switching control circuit 43 have the configuration shown in FIG.
In the figure, 47 is a subtraction circuit that subtracts the latch value of latch circuit 34 from the latch value of latch circuit 32, 48 is a subtraction circuit that subtracts the latch value of latch circuit 32 from the latch value of latch circuit 33, and 49 is a latch circuit. This is a subtraction circuit that subtracts the latch value of the latch circuit 33 from the latch value of the latch circuit 34. 50 is
The switch driver circuits 51 to 53 are operated by a negative value sent to any of the input terminals A, B, and C in the ROM as shown in Table 1 below.

【table】

[Table] As mentioned above, in this embodiment, the latch circuit 32 has a value
Since _T0 is assumed to be latched, only the subtraction circuit 47 sends out a negative value, as shown in Table 1.
A negative value is input to the input terminal A of the ROM 50. Therefore, the ROM 50 operates the first switch driver 51 to switch and connect the movable piece of the changeover switch 36 to the fixed piece 36 _-0 , and the switch driver 52
Operate the second switch to switch and connect it to the movable piece _37-1 of the changeover switch 37, and switch the switch driver 53.
The third switch is operated to switch and connect to the movable piece _38-2 of the changeover switch 38. Each value T ₀ , T ₁ , T ₂ sent in this way is stored in the ROM 39, 40, 41.
are converted into corresponding information, and the value _T0 is displayed as the ship code, the value _T1 as the heading position, and the value _T2 as the ship speed in code and numerically on each indicator 44, 45, 46. . Now, when the extraction pulse P ₃ ' changes the ternary counter 25 to 1 (see FIG. 5 e), the count value T ₁ ' of the counter 31 at that time (see FIG. 5 d) is transferred to the latch circuit 33. is latched to. Then, the latch values T ₀ ′, T ₁ , T ₂ ″ of each latch circuit 32 , 33 , 34 at this point are compared by a comparison circuit 42 , and
As shown in Table 1 above, the value T ₁ ' is the changeover switch 37.
is guided to the ROM 40 through the fixed piece 37 _-1 , and the above
The value T ₁ ' is converted into a corresponding heading value in the ROM 40 and displayed on the display 45. Next, when the extraction pulse _P1 is extracted and changes the ternary counter 25 to 2, the counter 3 at that time
The count value T ₂ ' of 1 is the previous value in the latch circuit 34.
The latch values T _{0 ′} , T ₁ ′, and T 2 ′ of each latch circuit 32, 33, and 34 at this point are compared in the comparator circuit 42 and set as the value T ₂ ″.
As shown in Table 1 above, T ₂ ' is led to the ROM 41 via the fixed piece 38 _-2 of the changeover switch 38, and the
The value T ₂ ' is converted into a corresponding ship speed value in the ROM 41 and displayed on the display 46. The extraction pulse P ₂ is extracted and the ternary counter 25
When T0 is changed to 0, the count value _T0 of the counter 31 at that time is latched by the latch circuit 32, updating the previous value _T0 '. Then, as before, the value T ₀
is guided to the ROM 39, converted into a corresponding ship code by the ROM 39, and displayed on the display 44. The above three extraction pulses P ₃ ′, P ₁ , and P ₂ have all updated the various information, and in principle, this is sufficient and the pulses P ₃ , P ⁰ ₁ to be extracted subsequently. For example, a method may be adopted in which a gate with a certain time width is formed to block the input to the ternary counter 25 and the delay circuit 35. Further, as in this embodiment, the updating operation may be performed as is without energizing the circuits such as the gates. This is because since the interval between each extraction pulse is extremely short, it is thought that there is no change in the various information during that time, and either method results in the same information or information with almost no difference. In this example, the extraction pulse
Information corresponding to the values T ₀ , T ₁ , and T ₂ is displayed as the latest information by P ₃ and P ⁰ ₁ (however, T ₀ remains unchanged). By loading each ship with the device according to the present invention, all movements of other ships can be automatically and quickly obtained by simply setting the direction. It is practical and extremely effective for safe operation without the hassle of communication. In this embodiment, there are three types of information: ship code, heading, and ship speed; however, the information is not limited to these, but may also include information such as water temperature, current, and water depth when combined with a sonar device. can be transmitted. Further, in the present invention, the gyro 3 is used to detect the heading direction of the ship 1a, but instead of the gyro 3, an angle signal corresponding to the rotational direction of the antenna 2a with the bow direction as a reference is generated and guided to the ROM 4. But it's okay. In this case, the ship 1b can know the relative traveling direction of the other ship 1a with respect to its own ship, and furthermore, the other ship 1b can know the traveling direction of the other ship 1a relative to its own ship.
It is also possible to find the direction of travel of a. Furthermore, if the device on the wave transmitting side receives the reflected wave from the target based on the radio wave pulse transmitted from the antenna 2a, amplifies and detects the wave, and guides it to a CRT display, etc., the repetition period of the wave is not constant. However, it has the same functions as a normal radar device.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between two fishing boats in operation to explain the basic operation of the present invention. Second
The figure is a circuit diagram of an information transmitting side device loaded on the ship 1a of FIG. 1, and FIG. 3 is a circuit diagram of an information receiving side device loaded on the ship 1b. Figure 4 shows
4 is a circuit diagram showing details of a comparison circuit 42 and a switching control circuit 43. FIG. FIG. 5 is a waveform diagram of the circuit shown in FIG. 3.

Claims (1)

[Scope of Claims] 1 (a) The first ship has a transmitting antenna that rotates in all directions, and n pieces of information regarding the first ship, each having T to T.
+t ₁ , T+t ₁ to T+t ₂ , ...T+t _o-1 to T+t _o
(however, t ₁ < t ₂ <...<t _o ), and a means for determining a time width within each time width in correspondence with a variable of each information, and each of the above set times. means for continuously transmitting n radio wave pulses from the above-mentioned wave transmitting antenna across the width of the ship; a wave receiving antenna capable of directing said wave receiving antenna toward said first ship direction; and directing direction control means for directing said wave receiving antenna toward said first ship direction; A ship information transmission radar device comprising: identification means for identifying each based on an interval; and reproduction means for reproducing n pieces of information regarding the first ship based on the time width of each identified radio pulse. .