JPS59125084A - Radar proximity alarm device - Google Patents

Abstract

PURPOSE:To operate effectively an alarm generating means by generating an alarm against an especially strong signal in only a range in which a set alarm distance range coincides with an alarm angle range, inhibiting a generation of an alarm by a reflected wave from land side when a ship is navigating along the coast, and generating an alarm in other angle range. CONSTITUTION:A gate signal for showing an angle range set by an alarm angle setting part 59 is generated, and an alarm signal is raised to only a part which coincides with a set range by an alarm distance setting part 41. When the angle range which can be set by the setting part 59 is limited to four kinds of 90- 270 deg., 45-315 deg., 0-180 deg. and 180-0 deg., a clock supplied to an angle counter 33 is supplied to an angle clock generator 61, and a clock of every once, every twice, every three times and every four times is generated. For instance, in case of inhibiting 90 deg. through 270 deg., an angle clock of every twice is given to a terminal 63, reset by an azimuth reference signal to an indicator 28, and thereafter, when a counter 67 counts 45, namely, when the angle becomes 90 deg. from the azimuth reference, an inhibiting signal is generated from an inhibiting gate generating circuit 68, and as for an inhibiting gate 72, its passing is inhibited between 90 deg. and 270 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radar warning device that issues a warning when a strong reflected wave is received within a set distance range in a radar device that performs so-called PPI display.

In a conventional radar warning device of this kind, an alarm is issued when a particularly strong reflected signal is obtained within a certain set range within the detection distance. In this radar warning system, for example, when the ship is sailing along land, a warning is always generated when the direction of the radar is directed toward the land, making it inconvenient to handle the system. In such a case, it would be extremely convenient if the warning could be issued only in a certain angular range ahead, without issuing a warning on the land side.

SUMMARY OF THE INVENTION An object of the present invention is to provide a radar warning device that issues an alarm when a strong reflected wave is obtained only when a set range and a set angle range are satisfied at the same time.

First, the general configuration of a radar warning system will be explained with reference to FIG. The directional antenna II has a directional direction of 360
The transmitting/receiving unit 2 periodically emits pulsed radio waves to the antenna 11, and the reflected waves are received. Kulock transmitter 1;5,
The 1μ output generates pulses of various frequencies corresponding to the detection distance range, and also generates trigger pulses of different frequencies for each distance range group, which are set by the distance range setting section 17 in the selector 16. Depending on the distance range, one of the pulses is selected and sent to the transmitter/receiver unit 1.
2, and a pulsed radio wave is emitted every time the trigger pulse is generated.

The received detection output from the transmitting/receiving section 12 is supplied to the AD converter 13, where each sample value is converted into a multi-bit digital signal. The converted digital signal is written into buffer memory 14. This writing is started at every unit angle of the radar 11, for example 0.5 degrees, and every time a pulsed radio wave is emitted, and a constant number of samples, for example 256 samples, are always taken in.

In response to the rotation of the directional direction of the antenna 110, a pulse is inserted from the azimuth signal generator 18 every time the directional direction of the radar antenna rotates by a unit angle, for example, 0.5 rd, and a so-called azimuth signal is outputted to the control circuit 19. Supplied. An azimuth reception signal is output from the azimuth signal generation section 18 when the direction of the radar antenna is directed toward the bow of the ship, for example, when a radar is attached to a ship.

An azimuth signal and a trigger signal are input to the control circuit 19, and each time the azimuth signal is generated, the immediately following signal controls the buffer memory 14 to write state, and also causes the selector 21 to select the output of the write counter 22. to control. The selector 23 selects one of the clock pulses generated by the clock generator 15 corresponding to each range corresponding to the distance range set by the distance range setting section 17. The selected clock pulses are counted by a write counter 22. When the write counter 22 counts the number of pulses necessary for writing to the buffer memory 14, for example 256, it is reset by the output thereof.

When the writing to the buffer memory 14 is completed, the control circuit 19 transfers the digital signal of the buffer memory 14 to the main memory 2.
Controls the transfer to 4. That is, the transfer counter 25 counts the clocks from the clock generator 15 to generate an address, and the contents of the transfer counter 25 are selected by the selector 21 and given to the buffer memory 14 as a read address. At the same time, the contents of the transfer counter 25 are selected by the selector 26, and the output thereof specifies the lower bits of the address in the main memory 24, that is, specifies the distance address. The buffer memory 14 is in the read state and the main memory 24 is in the read state.
is controlled to write state.

The azimuth signal from the azimuth signal generator 18 is supplied to the azimuth signal counter 27 and counted.
7 is reset by the azimuth reference signal from the azimuth signal generator 18. The contents of the azimuth signal counter 27 are given to the main memory 24 through the selector 26 as the upper bits of the address, that is, as the azimuth address.

The main memory 24 includes a buffer memory 14 as shown in FIG.
1 between memory cells storing the 1f sampling value of the detected video signal stored in 1. M1o to M1o are arranged in rows and columns, and the row direction, that is, the angular address is 0 degrees, 0.5 degrees, 10 degrees, 15 degrees, etc. in this example.
The angle counter 42 specifies the main memory 240 row address, that is, the angle address, and for each angle address, the column address, that is, the distance address, is written in the order of the closest reflected signal. Instructs the address to be incremented. Therefore, the buffer memory 14
As shown by the solid line arrow in FIG. 2, the transfer to the main memory 24 is from the memory cells M, .
, M, □...-Mln, and then when the angle signal reaches 0.5 degree, the second row memory cell M, ,
, , M22...M2n are stored, and in this way, detection signals corresponding to the angle signals are sequentially stored.

The main memory 24 is repeatedly read out and supplied as a display signal to a scanning type display, a color cathode ray tube display 28, for display. At this time, the digital detection signal read out from the main memory 24 is sequentially supplied to the color converter 32 through the inhibition circuit 29 and the synthesizer 31, and is converted into a color signal corresponding to the digital value in the color converter 32. Color display 28
is given as a display signal.

The clock from the clock generator 15 is applied to the angle counter 33.
The carry of the angle counter 33 is counted by the distance counter 34, and the counted values of these counters 33 and 34 are given through the selector 26 as a read address of the main memory 2-4.

In other words, depending on the contents of the angle counter 33, the main memory 240
The addresses in the column direction are specified sequentially, that is, the angular addresses are specified sequentially, and when the angular address for a -column is specified, a carry is performed, the distance address is incremented by one, and all row addresses for that column are That is, the angular address is specified and the main memory 24 is therefore read out sequentially as shown by the dotted lines in FIG.

This carry signal of the angle counter 33 is converted into a sine wave by the PM unit 35, that is, a sine wave signal whose period is one period for reading out one row of memory cells in FIG. The count value of DA converter 36
An analog multiplier 37 multiplies the converted analog signals, that is, analog signals corresponding to addresses in each distance direction in the memory cell. The multiplication power is divided into two,
One of them is supplied as is, while the other is shifted in phase by 90 degrees by a phase shifter 38 and supplied to the deflection circuit 39 of the color display 28. Therefore, the color display 28 is scanned concentrically, and as a result, the detection signal read out from the main memory 24 is displayed in PPI color.

A spiral operation may be used instead of this concentric scanning. The contents of the angle counter 33 and the distance counter 34 are supplied to the marker generator 39 and then to the color converter 32 through the synthesis circuit 31, so that the distance marker, the azimuth marker, and the reference azimuth are displayed on the display 28. be made into The control circuit 19 switches the address signal of the selector 26 and memo! Performs read/write control for 114.24.

Conventionally, an alarm distance setting section 41 is provided to set the alarm generation distance range, and the set alarm distance and the counted value of the distance counter 34 are compared in a coincidence detection circuit 42.
When the two match, the output causes the flip-flop 43
is set, and the Q output of the flip-flop 43 is supplied to the gate 44 as a gate signal.

On the other hand, the signal read from the main memory 24 is supplied to the inhibition game 129 as before, and is also input to the high level detector 45. The high level detector 45 detects when the level of the input radar detection signal is stronger than a predetermined value, and this detection output is supplied to the gate 44. The output of the coincidence detection circuit 42 is also supplied to a monostable multivibrator 46, and after a predetermined time, the flip-flop 43 is reset by the output of the monostable multivibrator 46.

Further, an alarm setting command is inputted to the gate 44 from the terminal 47. Therefore, if an alarm detection command is given to terminal 47,
When a particularly strong reflected wave is detected by the high level detection circuit 45 within a distance range corresponding to the pulse width of the monostable multivibrator 46 from the distance set in the alarm distance setting section 41, the detection output passes through the gate 44. do. The output of this gate 44 is further supplied to a gate 48 and sets a flip-flop 49. The output of the flip-flop 49 drives an alarm 51, for example, sounds a buzzer and opens an AND gate 52. The AND gate 52 is supplied with a signal that repeats a high level and a low level every 0.5 seconds, for example, from an on/off oscillator 53, and the gate 48 is controlled to open or close by the output of the gate 52.

The output of this gate 48 is supplied to the inhibition circuit 29.

The set input and reset input of flip-flop 430 are also supplied to alarm mark generation circuit 54, the output of which is supplied to synthesis circuit 31. As shown in FIG. 3, for example, a ring-shaped alarm mark 55 is formed and displayed according to the distance set by the alarm distance setting section 41, and further corresponds to the output width of the monostable multivibrator 46. A warning mark 56 is displayed concentrically outside the mark 55.

When a radar detection signal with a particularly strong level is detected within the detection distance range between the alarm marks 55 and 56, the flip-flop 49 is set and the alarm 51 is driven to emit an alarm as described above. At the same time, the detected strong level signal is intermittently passed through the gate 43 by the on-off oscillator 53 and given to the inhibition gate 29, and the strong level display point is displayed on the radar display screen every 0.5 seconds, for example. flashes. This blinking display indicates the presence of a strong reflector within the warning distance range and its location. A reset signal can be applied from the terminal 40 to the reset terminal of the flip-flop 49 to stop the generated alarm.

As mentioned earlier, when a ship equipped with a radar sails along the coast, for example in FIG. If this is the case, an alarm will be generated in all of these overlapping areas, and the device will no longer function as an alarm device. Therefore, in this example, it is preferable that the display section on the right side not generate an alarm even if a strong reflected wave is received.

For example, as shown in FIG. 4, an alarm angle setting section 59 is provided, a gate signal indicating the angle range set by the alarm angle setting section 59 is generated, and a portion corresponding to the range set by the alarm distance setting section 41 is provided. only when a warning signal is issued. In this example, the angle range that can be set by the alarm angle setting section 59 is limited to four types, so the clock supplied to the angle counter 33 is supplied to the angle clock generator 6J, A clock is generated every 3 degrees and then every 4 degrees. These four types of angle clocks are supplied to the selector 62, and predetermined angle clocks are respectively taken out from output terminals 63 and 64 according to the settings of the alarm angle setting section 59.

In other words, there are cases where the generation of an alarm is prohibited between 90 degrees and 270 degrees, cases where it is prohibited between 45 degrees and 315 degrees, cases where it is prohibited between 0 degrees and 180 degrees, and cases where it is prohibited between 180 degrees and 0 degrees. There are four types of prohibition between alarm setting section 5,
Depending on which of these four types is set at β;, a high level or a low level is output to the output terminals 65 and 66 and given to the selector 62, and the terminals 63 and 64 of the selector 62 are outputted as shown in Table 1. In the case where the angle clocks as shown in FIG. can get. The angle clock at the terminal 63 is counted by a prohibition start detection counter 67. The prohibition start detection counter 67 is 45.
The forward counter outputs an output when it counts 45 input clocks, and the output is supplied to the prohibition gate generation circuit 68 and the prohibition end detection counter 69. The prohibition end detection counter 69 is a 90-decimal counter.

If the angle from 90 degrees to 270 degrees is prohibited, use terminal 63.
When the counter 67 counts 45 after being reset by the azimuth reference signal to the display 28, that is, when the angle is 90 degrees from the azimuth reference, the prohibition gate generation circuit 68 generates a prohibition signal. A signal is generated which passes through the inverting selection circuit 71 to the inhibit gate 7.
2, the prohibition end detection counter 69 starts counting. When 90 angle clocks at the terminal 64 are counted, that is, when 180 degrees have elapsed since the start of counting in the case of a 2-degree angle clock in this example, the inhibition gate generation circuit 6 is activated by the output of the inhibition end detection counter 69.
Generation of the gate signal from 8 is stopped. Therefore, passage through the prohibition gate 72 is prohibited between 90 degrees and 270 degrees.

Inhibition gate 72 is supplied with the output of flip-flop 49 in FIG. Therefore, even if the output of the flip-flop 49 is at a high level, while the prohibition gate 72 is in the prohibited state, the output of the prohibition gate 72 is at a low level, and the output of the prohibition gate 72 is at a low level, and in the section where the gate 72 is not prohibited, that is, in FIG. 5A. As shown, the alarm generation section is between 270 degrees and 90 degrees, and when an alarm is present, the alarm 51 is activated, the on/off signal 53 passes through the gate 52, and a strong reflected signal is displayed blinking. The output of the prohibition gate 72 is also given to the gate 73, and the alarm mark signal from the alarm mark generation circuit 54 is supplied to the synthesis circuit 31 only in the alarm section of 270 degrees to 90 degrees.
As shown in FIG. 5A, alarm marks 55 and 56 are displayed only within the set alarm angle range.

For example, when prohibiting between 45 degrees and 315 degrees, the terminal 63 has an angle clock of 1 degree, and the terminal 64 has 3 degrees of angle clock.
An angular clock in degrees is given. Therefore, when the prohibition start detection counter 67 counts 45, it means 45 points from the reference direction.
5 degrees, a prohibition gate is generated from the prohibition gate generation circuit 68, and from the time when this gate is generated, the prohibition end detection counter 69 starts counting the angle clock every 3 degrees, and 3 degrees x 90 = 170 degrees. , the generation of prohibition gates is stopped. Therefore, an alarm section as shown in FIG. 5B is obtained.

When the range from 0 degrees to 180 degrees is prohibited or alarmed, as shown in Table 1, an angle clock every 4 degrees is output to the terminal 63, and an angle clock every 2 degrees is output to the terminal 64. . Therefore, if the prohibition section is from 180° to 0°, when the prohibition period reaches 180 degrees, the prohibition start detection counter 6
7 causes the prohibition gate generation circuit 68 to generate a prohibition gate, and when 180 degrees have elapsed, the generation of the prohibition gate is stopped by the output of the prohibition end detection counter 69, resulting in the state shown in FIG. 5C. In addition, when prohibiting between 0 degrees and 180 degrees, the prohibition gate generation circuit 6
It is only necessary that the inhibition gate signal from 8 is inverted by the inversion selection circuit 71 and supplied to the inhibition gate 72. In this way, an alarm section as shown in FIG. 5DK is obtained.

FIG. 6 shows a specific example of FIG. 4. That is, in the angle clock generator 61, the reference azimuth signal is input to the terminal 74,
An angle clock signal of 05 degrees is inputted to the terminal 75, and angle clocks of 1 degree, 2 degrees, and 4 degrees are obtained from the frequency dividing circuit 76, and an angle clock of 3 degrees is obtained from the frequency dividing circuit 77. These are input to the selector 62. Outputs from the selector output terminals 63 and 64 are supplied to a prohibition start detection counter 67 and a prohibition end detection counter 69, respectively.

The prohibition start detection counter 67 is preset to 45 by the reference direction signal at the terminal 74, and starts counting down from this point. The output of the counter 67 is applied as a constant width pulse to the load terminal of the inhibition end detection counter 69, and the counter 69 is preset to 90, and the output pulse of the circuit 78 causes the flip-flop 68 is cleared, the counter 69 is enabled by its Q output, and the current counter 9 starts counting down. The flip-flop 68 is set by the output of the counter 69.

The Q output of flip-flop 68 causes counter 69
operation is stopped. The selection circuit 71 is the alarm angle setting device 5
9, when 0 to 180 degrees is set as a warning section, the input is passed through the gate 71a, and when 0 degrees to 180 degrees is set as the prohibited section, the input is passed through the gate 71b. In this way, the alarm can be generated only within the range corresponding to the set angle. 1" is written in the flip-flop tab 79 by the digit -F output of the counter 67, the operation of the counter 79 is stopped by the Q output, and the flip-flop 79 is cleared by the direction reference signal at the terminal 74. Further, in order to set an arbitrary angle from an arbitrary angle to the alarm section, a value corresponding to the arbitrary angle may be set in the counters 67 and 69.

As described above, according to the radar alarm device according to the present invention, an alarm is issued in response to a particularly strong signal only within the range where the set alarm distance range and the set alarm angle range match. As mentioned above, when a ship is sailing along the coast, it is possible to prohibit the generation of a warning due to reflected waves from the land side, and by making it possible to generate a warning within the other angular range. , the alarm generating means can be effectively operated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a radar warning device according to the present invention, FIG. 2 is a diagram showing the memory cells of the main memory and write/read states, and FIG. 3 is a diagram showing warning marks of a conventional warning device. FIG. 4 is a block diagram showing an example of the essential parts of the alarm device according to the present invention, FIG. 5 is a diagram showing the alarm generation range according to various settings, and FIG. 6 is a diagram showing a specific example of FIG. 4. . 11: Radar antenna, 12: Transmission/reception section, 13: AD converter, 14: (sofa memory, 18: Direction signal generation section, 24: Main memory, 28: Scanning display, 33: Direction counter, 34: Distance Counter, 41: Alarm distance setting section,
42 Coincidence detection circuit, 44.48: Gate, 45: Large level reflected signal detector, 51: Alarm, 53: On/off signal generator, 54: Alarm mark oscillation circuit, 59: Alarm angle setting section, 61: Various Angle clock generator, 62: Selector, 67: Inhibition start detection force counter, 69: Inhibition end detection counter, 68: Inhibition gate generator. I 2 drawings 3 drawings! 1117 Oki 5 81δ〇- 180- Procedural amendment (voluntary) January 21, 1988 2, Title of invention Radar proximity warning device 8, Relationship with the person making the amendment Case Patent applicant Co., Ltd. Koden Seisakusho 4 , Agent 4-2-21 Shinjuku, Shinjuku-ku, Tokyo
Sogoku Building 5, subject of amendment Detailed explanation column of the invention in the specification and drawings (S, Contents of amendment (1) Changed "Angle counter 42" in line 2 on page 6 of the specification to "
Direction signal counter 27". (2) ``Marker generation section 39'' is corrected to ``marker generation section 50'' on page 8, line 10 of the same book. (3) Lines 15-16 and 16-17 of page 14 of the same book are corrected to read "flip-flop 49j is r flip-flop 43." (4-Correct drawing 4-Diagram to the attached drawing. (5) Correct the code r39.J (center) in Fig. 1 to "50" as shown in red ink on the copy drawing, and correct it to "50" in Fig. 6. Correct the code "49" to "43".

Claims (1)

[Claims] (1) In a radar device that emits radio wave pulses while rotating the pointing direction of the transmitting and receiving beam, and displays the detection signal obtained by receiving the reflected wave on a scanning display in PPI,
means for setting an alarm detection distance range; means for setting an alarm angle range; means for detecting that the received detection signal is at a predetermined level or higher; A radar proximity warning device comprising means for selecting an output of a detection signal equal to or higher than the predetermined level to issue an alarm, and means for issuing an alarm based on the selected output.