JPH0623982Y2 - Radar proximity warning device - Google Patents

Description

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

"Prior Art" In a conventional radar warning device of this type, if a particularly strong reflection signal is obtained within a certain set range within the detection distance,
I was trying to give an alarm. In this radar warning device, for example, when navigating along the land, a warning is always issued and the handling is inconvenient when the direction of the radar is toward the land. In such a case, on the land side without issuing an alarm,
For example, it is proposed in JP-A-56-97888 and JP-A-52-131491 to set an alarm range with a distance range and an angle range so that an alarm is generated only in a certain angle range in front. ing.

However, in these cases, the alarm angle range is set in two steps, such as setting the azimuth and setting the angular width in the former, and setting two different azimuths in the latter. However, it is not possible to perform the setting operation quickly, and it takes time.

"Means for Solving the Problem" According to the present invention, the means for setting the alarm angle range is one for selectively setting one of several predetermined different angle ranges, and the received detection signal. From the above, a large level of a predetermined level or more is detected, and an alarm is issued when the large level detection output is obtained within the set alarm angle range within the set alarm detection distance.

[Embodiment] First, a general configuration of a radar warning device will be described with reference to FIG. The directionality of the directional antenna 11 is 360
The transmission / reception unit 12 periodically radiates pulsed radio waves to the antenna 11 and receives the reflected waves. The output from the clock oscillator 15 generates pulses of various frequencies corresponding to the detection distance range, and also generates trigger pulses of different frequencies for each distance range group. One of the trigger pulses is selected according to the distance range set by 17, and is supplied to the transmission / reception unit 12, and a pulse radio wave is radiated for each trigger pulse.

The reception detection output from the transmission / reception unit 12 is supplied to the AD converter 13, and each sample value is converted into a digital signal of a plurality of bits in the AD converter 13. The converted digital signal is written in the buffer memory 14. This writing is started every unit angle of the radar 11, for example, every 0.5 degrees and every time the trigger pulse radio wave is emitted, and a fixed number of samples, for example, 256 samples are always taken.

According to the rotation of the directional direction of the antenna 11, the azimuth signal generator 18 determines that the directional direction of the radar antenna is a unit angle,
A pulse is inserted every time it rotates by 0.5 degrees, and a so-called azimuth signal is output and supplied to the control circuit 19. The azimuth reference signal is output from the azimuth signal generation unit 18 when the radar antenna is attached to the reference of the azimuth, for example, when the radar antenna is oriented in the bow direction of the radar.

An azimuth signal and a trigger signal are input to the control circuit 19, and each time the azimuth signal is generated, the trigger signal immediately after that controls the buffer memory 14 to the write state, and the selector 21 selects the output of the write counter 22. Control. The selector 23 selects one of the clock pulses corresponding to each range generated by the clock generator 15 corresponding to the distance range set by the distance range setting unit 17. The selected clock pulse is counted by the write counter 22. The write counter 22 is reset by its output when the number of pulses necessary for writing to the buffer memory 14, for example, 256 is counted.

When the writing to the buffer memory 14 is completed, the control circuit 19 sends the digital signal of the buffer memory 14 to the main memory 2
4 is controlled. That is, the transfer counter 25 counts the clock from the clock generator 15 to generate an address, and the content of the transfer counter 25 is 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 lower bits of the address of the main memory 24 are designated by the output thereof, that is, the distance address is designated. The buffer memory 14 is in the read state and the main memory 2
4 is controlled to the written state. On the other hand, the azimuth signal from the azimuth signal generator 18 is supplied to and counted by the azimuth signal counter 27, and the azimuth signal counter 27 is reset by the azimuth reference signal from the azimuth signal generator 18. The content of the azimuth signal counter 27 is 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 is a buffer memory 14 as shown in FIG.
The memory cells M _{11 to} M _1n for storing one sampling value of the detected video signal stored in are arranged in rows and columns, and the row direction, that is, the angle address is 0 degree, 0.5 degree in this example, Addresses are provided in 0.5 degree increments such as 1.0 degree, 1.5 degree, etc., and a row address, that is, an angle address of the main memory 24 is designated by the azimuth signal counter 27, and a column address, that is, a distance address for each angle address. Are instructed so that the addresses increase in the order of the closer reflected signals. Therefore, from the buffer memory 14 to the main memory 2
4 is transferred to the memory cells M ₁₁ , M ₁₂ ... M _1n in the first row as indicated by solid arrows in FIG.
When the angle signal reaches 0.5 degrees, the memory cells M ₂₁ , M ₂₂ ... M _2n on the second row are sequentially stored. In this way, the detection signal corresponding to the angle signal is sequentially stored. It

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

The clock from the clock generator 15 is the angle counter 33.
The carry of the angle counter 33 is counted by the distance counter 34, and the count values of the counters 33, 34 are given as read addresses of the main memory 24 through the selector 26. That is, the address of the column direction of the main memory 24 is sequentially designated by the content of the angle counter 33, that is, the angle address is sequentially designated, and when the angle address for one column is designated, the carry is performed and the distance address is advanced one step. All row addresses for that column, i.e., angular addresses, are specified, and thus the main memory 24
Are sequentially read out as shown by the dotted line in FIG.

The carry signal of the angle counter 33 is converted into a sine wave by the filter 35, that is, a sine wave signal having a period of reading one row of the memory cell in FIG. 2 as one cycle is obtained. DA converter 36
The analog signal converted in step 1, that is, the analog signal corresponding to the address in each distance direction in the memory cell is multiplied by the analog multiplier 37. The multiplication calculation power is divided into two,
One of them is kept as it is, and the other is shifted in phase by 90 degrees by the phase shifter 38 and supplied to the deflection circuit 39 of the color display 28. Therefore, the color display 28 performs concentric scanning, and as a result, the detection signal read from the main memory 24 is displayed in PPI color. A spiral operation may be used instead of the concentric scanning. The contents of the angle counter 33 and the distance counter 34 are supplied to the marker generator 50 and the color converter 32 through the synthesizing circuit 31, and the display 28 displays the distance marker, the azimuth marker, and the reference azimuth. To be done. The control circuit 19 performs switching of the address signal of the selector 26 and read / write control for the memories 14 and 24.

Conventionally, an alarm distance setting unit 41 is provided for setting an alarm generation distance range, and the set alarm distance and the count value of the distance counter 34 are compared by the coincidence detection circuit 42,
When both match, the output of 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 prohibition gate 29 and the large level detector 45 as described above.
Is also entered. In the large level detector 45, when the level of the input radar detection signal is stronger than a predetermined value,
This is detected, and the detection output is supplied to the gate 44. The output of the coincidence detection circuit 42 is also supplied to the monostable multivibrator 46, and after a predetermined time, the output of the monostable multivibrator 46 resets the flip-flop 43.

Further, an alarm setting command is input to the gate 44 from the terminal 47. Therefore, when an alarm detection command is given to the terminal 47, a particularly strong reflected wave has a large level detection circuit 45 within a distance range corresponding to the pulse width of the monostable multivibrator 46 from the distance set by the alarm distance setting unit 41.
When detected at, the detection output passes through the gate 44. The output of this gate 44 is further supplied to the gate 48 and sets the flip-flop 49. The output of the flip-flop 49 drives the alarm device 51 to ring a buzzer and open the AND gate 52, for example. A signal that repeats high level and low level is supplied to the AND gate 52 from the ON / OFF oscillator 53, for example, every 0.5 seconds, and the output of the gate 52 controls the opening and closing of the gate 48. The output of the gate 48 is supplied to the inhibition circuit 29.

The set input and the reset input of the flip-flop 43 are also supplied to the alarm mark generation circuit 54, and the output thereof is supplied to the synthesis circuit 31. This warning mark is formed and displayed as a ring-shaped warning mark 55, for example, as shown in FIG. 3 according to the distance set by the warning distance setting unit 41, and further corresponds to the output width of the monostable multivibrator 46. An alarm mark 56 is displayed concentrically outside the mark 55.

When a signal having a particularly strong level is detected in the radar detection signal 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 generate an alarm sound as described above. While being emitted, the detected strong level signal is intermittently passed through the gate 48 by the on / off oscillator 53 and given to the prohibition gate 29, and the strong level display point blinks, for example, every 0.5 seconds on the radar display screen. To do. By this blinking display, a strong reflector exists within the alarm distance range and its position can be known. A reset signal can be applied to the reset terminal of the flip-flop 49 from the terminal 40 to stop the alarm being generated.

As described above, when a ship equipped with a radar sails along the coast, for example, an image 57 of the land portion is displayed on the right side of FIG. 3 and the land image 57 is displayed between the warning marks 55 and 56. If it is inside, all the alarms will be generated in this overlapped portion, and it will no longer function as an alarm device. Therefore, in this example, it is preferable that the display portion on the right side thereof does not generate an alarm even when a strong reflected wave is received.

For example, as shown in FIG. 4, an alarm angle setting unit 59 is provided, a gate signal indicating the angle range set by the alarm angle setting unit 59 is generated, and a portion that matches the range set by the alarm distance setting unit 41 Only the alarm signal is issued. In this example, the angle range that can be set by the alarm angle setting unit 59 is limited to four types. Therefore, the clock to be supplied to the angle counter 33 is supplied to the angle clock generator 61 so that it can be set once or twice. A clock is generated every 3 degrees and further every 4 degrees. These four types of angle clocks are supplied to the selector 62, and the alarm angle setting unit 59
Depending on the setting of, the predetermined angle clock is taken out from each of the output terminals 63 and 64.

That is, when the alarm is prohibited from occurring between 90 degrees and 270 degrees, when it is prohibited between 45 degrees and 315 degrees, when it is prohibited between 0 degrees and 180 degrees, and when it is between 180 degrees and 0 degrees. There are four kinds of cases where it is prohibited between the alarm setting section 59
In accordance with which of these four types is set, the high level or 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 set as shown in Table 1. Each angle clock is obtained.

For example, in the case of prohibiting 90 degrees to 270 degrees, the terminal 65 is at the high level H and the terminal 66 is at the low level L, and the angle clocks of 2 degrees are obtained at the terminals 63 and 64, respectively. The angle clock of the terminal 63 is counted by the inhibition start detection counter 67. The inhibition start detection counter 67 is a 45-ary counter and outputs an output when the input clock is counted 45, and the output is supplied to the inhibition gate generation circuit 68 and the inhibition end detection counter 69. Prohibition end detection counter 6
Reference numeral 9 is a 90-ary counter.

In the case of prohibiting 90 to 270 degrees, the terminal 63
When the counter 67 counts 45, that is, when the angle becomes 90 degrees from the azimuth reference after being reset by the azimuth reference signal to the display unit 28, the inhibition gate generation circuit 68 prohibits. A signal is generated, which is transmitted through the inversion selection circuit 71 to the inhibition gate 7
2, and the prohibition end detection counter 69 starts counting. When 90 angle clocks of the terminal 64 are counted, that is, when 180 degrees have passed after starting this count in the case of the angle clock of 2 degrees in this example, the inhibition gate generation circuit 6 is output by the inhibition end detection counter 69.
The generation of the gate signal from 8 is stopped. Therefore, the prohibition gate 72 is prohibited from passing between 90 degrees and 270 degrees.

The inhibit gate 72 is supplied with the output of the flip-flop 43 shown in FIG. Therefore, even if the output of the flip-flop 43 is at a high level, the output of the prohibition gate 72 is at a low level while the prohibition gate 72 is in the prohibition state, and this gate 72 is not prohibited, that is, shown in FIG. 5A. As described above, when an alarm is present between 270 degrees and 90 degrees and an alarm is present, the alarm device 51 is driven, the on / off signal 53 passes through the gate 52, and a strong reflection signal is displayed blinking. The output of the prohibition gate 72 is also given to the gate 73, and the warning mark signal from the warning mark generating circuit 54 is supplied to the synthesizing circuit 31 only in the warning section of 270 to 90 degrees, and as shown in FIG. 55 and 56 are displayed only in the set alarm angle range.

For example, in the case of prohibiting between 45 degrees and 315 degrees, the angle clock for every 1 degree is applied to the terminal 63 and 3 to the terminal 64.
An angle clock in degrees is provided. Therefore, when the prohibition start detection counter 67 counts 45, it is 4
At the time of 5 degrees, the inhibition gate is generated from the inhibition gate generation circuit 68, and the angle clocks every 3 degrees are counted by the inhibition end detection counter 69 from the time when this gate is generated, and the inhibition end detection counter 69 starts 3 degrees × 90 = 270. When a certain degree has passed, the generation of the prohibited gate is stopped. Therefore, the alarm section as shown in FIG. 5B is obtained.

When 0 ° to 180 ° is prohibited or an alarm section is set, 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, when 180 degrees to 0 degrees is set as the prohibition section, when it reaches 180 degrees, the prohibition gate is generated by the prohibition gate generation circuit 68 by the output of the prohibition start detection counter 67. The output stops the generation of the prohibition gate, resulting in the state shown in FIG. 5C. Further, in the case of prohibiting between 0 degrees and 180 degrees, the prohibition gate signal from the prohibition gate generation circuit 68 may be inverted by the inversion selection circuit 71 and supplied to the prohibition gate 72. In this way, the alarm section as shown in FIG. 5D is obtained.

FIG. 6 shows a concrete example of FIG. That is, in the angle clock generator 61, the reference direction signal is input to the terminal 74,
An angle clock signal of 0.5 degree is input to the terminal 75, each of the angle clocks of 1, 2, and 4 degrees is obtained from the frequency dividing circuit 76, and further, the angle clock of 3 degrees is obtained by the frequency dividing circuit 77. These are input to the selector 62. The outputs of the selector output terminals 63 and 64 are supplied to the inhibition start detection counter 67 and the inhibition end detection counter 69, respectively. In the prohibition start detection counter 67, 45 is preset by the reference azimuth signal from the terminal 74, and the down count is started from this. The carry-down output from the counter 67 is given to the load terminal of the inhibition end detection counter 69 as a pulse having a constant width by the pulse generation circuit 78, and the counter 69 is supplied with 9 bits.
At the same time that 0 is preset, the output pulse of the circuit 78 clears the flip-flop 68, the Q output thereof enables the counter 69, and the counter 69 starts counting down. The carry-down output of the counter 69 sets the flip-flop 68. The Q output of the flip-flop 68 stops the operation of the counter 69. The selection circuit 71 sets the alarm angle setter 59 to 0.
The input is passed through the gate 71a when the alarm section is between 0 and 180 degrees, and is passed through the gate 71b when the 0 through 180 degree section is the prohibited section. In this way, the alarm can be issued only within the range corresponding to the set angle. It should be noted that "1" is written in the flip-flop 79 by the carry-down output of the counter 67, the operation of the counter 79 is stopped by the Q output thereof, and the flip-flop 7
9 is cleared by the azimuth reference signal from the terminal 74. Further, in order to set an arbitrary angle from an arbitrary angle to the alarm section, the counters 67 and 69 may be set to values corresponding to the arbitrary angle.

[Advantage of Device] As described above, according to the radar alarm device of the present invention, an alarm is given to a particularly strong signal only within the range where the set alarm distance range and the set alarm angle range match. To occur. Moreover, in this invention, since the alarm angle range is set by selecting one from several kinds of predetermined angle ranges, it can be set by one operation,
The setting operation is quick and easy.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a radar alarm device according to the present invention, FIG. 2 is a diagram showing a memory cell of the main memory and a write / read state, and FIG. 3 is a diagram showing an alarm mark of a conventional alarm device. FIG. 4 is a block diagram showing an example of essential parts of an alarm device according to the present invention, FIG. 5 is a diagram showing an alarm generation range according to various settings, and FIG. 6 is a diagram showing a concrete example of FIG. . 11: radar antenna, 12: transmitter / receiver, 13: AD converter, 14: buffer memory, 18: azimuth signal generator,
24: main memory, 28: scanning type display, 33: direction counter, 34: distance counter, 41: alarm distance setting section, 4
2: coincidence detection circuit, 44, 48: gate, 45: large level reflection signal detector, 51: alarm device, 53: on / off signal generator, 54: alarm mark oscillation circuit, 59: alarm angle setting unit, 61: various Angle clock generator, 62: selector, 67: prohibition start detection counter, 69: prohibition end detection counter, 68: prohibition gate generator.

Claims (1)

[Scope of utility model registration request] 1. A radio wave pulse is radiated while rotating the direction of a transmitted / received beam, and a detection signal obtained by receiving the reflected wave is PPI-displayed on a scanning type display, and is set by a distance setting means. When a reflected wave is detected within the alarm detection distance range of the distance and within the alarm angle range set by the angle setting means, in the radar proximity warning device that issues an alarm by the alarm means, a large level of a predetermined level or more is received from the received detection signal. A detection means for detecting only the level; a means for generating a gate signal in a range in which the alarm detection distance range and the alarm angle range set by the angle setting means match according to the setting of the distance setting means; Controlled by a signal, the detection means and a gate provided in cascade are provided, and a signal passing through both the gate and the detection means is supplied to the alarm means. The angle setting means selects and sets one of a plurality of different angle ranges depending on an angle clock generator that generates a plurality of different angle clocks, an alarm angle setting unit, an alarm start counter, and an alarm end counter. A radar proximity warning device having a configuration.