JP2001183440A - Radar device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display control method, capable of displaying plural radarscopes by arbitrarily selecting display coordinate axes by a small hardware quantity in a radar device, having an electron beam scanning antenna. SOLUTION: A display signal holder for holding three-dimensional radar signal information, and a coordinate axis control circuit are provided to arbitrarily select display coordinate axes to display plural radarscopes. A size comparison circuit is added to prevent a target video captured once by a radar signal processing part from being re-displayed, by remaining up to the electron beam scanning time of the same position. An afterglow time control circuit is also added to arbitrarily control the afterglow time or the display luminance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar apparatus having an electron beam scanning antenna.

[0002]

2. Description of the Related Art FIG. 9 shows an example of a configuration of a radar signal processing section of a general electron beam scanning radar apparatus. 9, 1 is a radar signal processing unit, 6 is a digital radar video signal, 15 is an electron beam scanning antenna, 16 is a transceiver, 17 is a signal processor, 18 is a scanning controller, 19 is a transmission / reception signal, and 20 is a radar. A video signal, 21 is a scanning control signal, and 22 is a mode control signal.

The radar signal processing unit 1 is configured as described above, and the electron beam scanning antenna 15 controls the phase of the radio wave surface by the scanning control signal 21 output from the scanning controller 18 to mechanically control the electron beam. Scanning antenna 1
It is possible to arbitrarily scan a certain range of space without moving 5.

FIG. 10 is a structural example showing a conventional electron beam scanning radar device. In the figure, 1 is a radar signal processing unit, 2a is a By / R display signal holder, 2b is an E / R display signal holder, 2c is a By / E display signal holder, 3a is a By / R display signal converter, 3b is an E / R display signal converter, 3c is a By / E display signal converter, 4a is a By / R display CRT, 4b is an E / R display CRT, 4c is By,
E display CRT, 6 is a digital radar video signal, 7a
Is a By / R radar display signal, 7b is an E / R radar display signal, 7c is a By / E radar display signal, 8a is a By / R display video signal, 8b is an E / R display video signal, and 8c is B
y, E display video signal.

[0005] The conventional electron beam scanning radar apparatus is configured as described above, and the digital radar video signal 6 output from the normal radar signal processing section 1 is temporarily changed to a By / R display signal holder 2a, depending on the display application. The E, R display signal holder 2b and the By, E display signal holder 2c
Two types of signal information among three types of signal information of y, E, and R are selected and held. By / R display signal holder 2
a, E, R display signal holder 2b, By, R radar display signal 7a, E, R output from By, E display signal holder 2c.
The radar display signals 7b, By and E are displayed on the CRT by the By / R display signal converter 3a, the E / R display signal converter 3b and the By / E display signal converter 3c, respectively.
By, R display video signal 8 converted to display frequency
a, E, R display video signal 8b and By, E display video signal 8c are output, and the CRTs for By and R display, respectively.
4a, CRT for displaying E and R 4b, CRT for displaying By and E
4c.

Here, By represents Bearing = azimuth in a horizontal plane, E represents Elevation = high angle in a vertical plane, and R represents Range = distance. As a feature of the electron beam scanning radar device, the digital radar video signal 6 output from the radar signal processing unit 1 sequentially fills the hemispherical space with an arbitrary combination of By and E when viewed on the time axis, and has a constant value. The scanning in the hemispherical space is repeated periodically or irregularly.

[0007]

In a radar apparatus having the above-described conventional electron beam scanning antenna, a radar beam can be scanned in an arbitrary order in a hemispherical space, but a radar video signal on a radar scope display is not displayed. , Displayed or erased randomly. Therefore, the radar video signal once input is held until the same position is next scanned with a radar beam and a new radar video signal is input, so that it is difficult to discriminate each radar video signal temporally.

Further, the unnecessary radar video signal which has been temporarily input is held, and the radar beam is scanned at the same position, and the continuous radar video signal from the target is maintained until the unnecessary radar video signal is erased. In some cases, the radar video signal from the target is deleted by a temporary weak radar video signal, and the radar video signal from the target is erroneously recognized as an unnecessary radar video signal.

Further, in order to perform radar scope display according to the display application, a By / R display system, an E / R display system,
A dedicated device configuration is required for each of the y and E display systems, and there is a problem that the device scale becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. A radar apparatus capable of greatly reducing the apparatus scale, preventing erroneous recognition of radar video signals, and temporally separating radar video signals. The purpose is to obtain.

[0011]

A radar apparatus according to a first aspect of the present invention comprises a By, E, and R display signal holder for collectively holding a digital radar video signal generated by a radar signal processing unit, and a switching operation of the above-mentioned By, E, and R display signals. And a coordinate axis control circuit for generating a display coordinate axis selection signal for extracting an arbitrary selected coordinate axis radar display signal from the E and R display signal holders.

Further, the radar apparatus according to the second aspect of the present invention uses the configuration of the radar apparatus according to the first aspect of the present invention to compare the magnitude of a digital radar video signal with a held video signal output from a By, E, R display signal holder. And a magnitude comparison circuit for outputting a stored video signal is provided.

[0013] The radar apparatus according to a third aspect of the present invention is the radar apparatus according to the second aspect.
And a persistence time control circuit for outputting a subtraction control signal for controlling the magnitude of the stored video signal.

[0014] A radar apparatus according to a fourth aspect of the invention is the radar apparatus according to the third aspect of the invention, in which a plurality of display signal converters and a plurality of displays are provided.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of a radar apparatus according to a first embodiment of the present invention. A radar signal processing unit 1 and a digital radar video signal 6 are the same as or equivalent to the conventional apparatus, and 2 is By, E. ,
R display signal holder, 3 is a display signal converter, 4 is display C
RT and 5 are coordinate axis control circuits, 7 is a selected coordinate axis radar display signal, 8 is a display video signal, and 9 is a display coordinate axis selection signal.

The radar apparatus according to the first embodiment can reduce the scale of the apparatus by allowing an arbitrary radar scope display to be switched and displayed by a display coordinate axis selection signal, and has a certain order to generate a radar video signal. By updating,
The purpose is to excite the operator to detect the target video.

In FIG. 1, a digital radar video signal 6 output from the radar signal processing unit 1 has By information, E information, and R information.
B in the form of sequentially filling the hemisphere space with the combination of y and E
The y, E, and R display signal holders 2 sequentially hold the signals.

On the other hand, the coordinate axis control circuit 5 performs a switching operation to perform radar scope display according to the display application.
A display coordinate axis selection signal 9 for selecting the y, R coordinate axis or the E, R coordinate axis or the By, E coordinate axis is generated. By,
A selected coordinate axis radar display signal 7 corresponding to the display application is output from the E and R display signal holders 2, and converted into a display video signal 8 having a frequency for CRT display by the display signal converter 3 and converted to a display CRT 4. A predetermined radar scope display is performed.

At this time, the display coordinate axis selection signal 9 is constant regardless of the order in which the digital radar video signal 6 output from the radar signal processing unit 1 is held in the By, E, R display signal holding unit 2. It is controlled so that the selected coordinate axis radar display signal 7 is sequentially taken out by the combination of By and E.

2 (a) to 2 (e) are conceptual diagrams of the By, E, R display signal holder 2. Reference numeral 23 denotes a storage example of By information, E information, and R information of the radar video signal 6, and FIG. Is an example of correspondence between By information, E information, R information and a storage address. As an example of a radar scope display combining By information, E information, and R information, reference numeral 25 denotes By, R display (PPI display).
Example, 26 is E, R display (RHI display) example, 27 is By,
It is an example of E display.

FIG. 3 is a detailed diagram of the coordinate axis control circuit 5. 28a is a storage address read counter when the By and R coordinate axes are selected, 28b is a storage address read counter when the E and R coordinate axes are selected, and 28c is a storage address read counter when the By and E coordinate axes are selected.

In FIG. 3, when the By, R display (PPI display) 25 is selected, the storage addresses for extracting the selected coordinate axis radar display signal 7 from the By, E, R display signal holder 2 are By, R. It is controlled by the storage address read counter 28a at the time of coordinate axis selection, and B = 0 from By = 0 °.
By and R displays (PPI displays) 25 are drawn at regular intervals toward y = 360 °.

On the other hand, when the E, R display (RHI display) 26 is selected, the storage address for extracting the selected coordinate axis radar display signal 7 from the By, E, R display signal holder 2 is:
Storage address read counter 2 when E and R coordinate axes are selected
8B, the E, R display (RHI display) 26 is drawn at regular intervals from E = 0 ° to E = 90 °.

Similarly, when the By, E display 27 is selected, the storage addresses for extracting the selected coordinate axis radar display signal 7 from the By, E, R display signal holder 2 are By, E.
Controlled by the storage address read counter 28c at the time of coordinate axis selection, the By and E displays 27 are drawn neatly at regular intervals from By = 0 ° to By = 360 °. In this way, by rendering the radar scope display with a certain order, the operator's viewpoint can be concentrated and the detection of the target video can be excited.

Embodiment 2 FIG. 4 shows the first embodiment.
The digital radar video signal 6 is compared with the video signal held by the By, E, R display signal holder 2 in the configuration of the radar apparatus according to the above, and the luminance of the radar video signal that is older in time is sequentially reduced. FIG. 10 is a configuration diagram of a radar apparatus according to the second embodiment, where 10 is a magnitude comparison circuit, 11 is a held video signal, and 12 is a stored video signal.

The radar apparatus according to the second embodiment, when updating the radar video signal with a certain order similarly to the radar apparatus according to the first embodiment, newly inputs a radar video signal that is older in time and a new one. An object of the present invention is to excite detection of a target video by an operator by making it possible to identify an incoming digital radar video signal by a difference in luminance.

In FIG. 4, the holding video signal 11 which is a temporally old radar video signal held by the By, E, R display signal holding unit 2 and the newly input digital radar video signal 6 are large and small. The digital radar video signal 6 (V1) newly compared and compared by the comparison circuit 10
Is larger, the value of the signal (V1) is larger than that of the held video signal 11 (V2).
A value (V2−V3) obtained by subtracting a preset subtraction number (V3) from the value of 2) is used as the stored video signal 12 as By, E,
It is stored again in the R display signal holder 2. The selected coordinate axis radar display signal 7 is output from the By, E, R display signal holder 2 in the same manner as in the first embodiment, and a predetermined radar scope display is performed.

FIG. 5 is a detailed diagram of the magnitude comparison circuit 10. 29 is an input example of the newly input radar video signal 6, 30 is a storage address determination of the newly input radar video signal 6, and 31 is the same storage address as the storage address of the newly input radar video signal 6. , 32 is a magnitude comparison process between the newly input radar video signal 6 and the read retention video signal, 33 is a branch determination after the magnitude comparison process, and 34 is a newly input radar video. The holding of the signal 6 and the subtraction processing 35 of the held video signal are performed.

In FIG. 5, the storage address of the newly input radar video signal 6 is uniquely determined from the By information, E information, and R information. Next, the held video signal 11 having the same address as the determined storage address is read out, compared with the previously input radar video signal 6 which is newly input, and the branch is determined. If the newly input radar video signal 6 is larger than the held video signal 11 as a result of the branch determination 33 after the magnitude comparison processing, the newly input radar video signal 6
By re-storing it in the y, E, R display signal holder 2, the radar video signal 6 is updated temporally to a new one.

When the held video signal 11 is larger than the newly input radar video signal 6, the input radar video signal 6 is regarded as a transient weak radar video signal and is excluded. A value obtained by subtracting the set decrement from the held video signal 11 is used as the stored video signal 12 as B
The data is stored again in the y, E, R display signal holder 2.

By this series of processing, the radar beam is scanned next at the same position without continuously holding the unnecessary radar video signal which is temporarily input, and the continuous radar video signal from the target is newly input and held. Accordingly, a stable radar scope display can be obtained without being erased by a temporary weak radar video signal.

Embodiment 3 FIG. FIG. 6 shows the second embodiment.
Is a configuration diagram of a radar apparatus showing a third embodiment in which the number of radar video signals reduced by the magnitude comparison circuit 10 can be arbitrarily controlled in the configuration of the radar apparatus according to the first embodiment. This is a control signal.

The radar apparatus according to the third embodiment is similar to the radar apparatus according to the second embodiment when distinguishing between a temporally old radar video signal and a newly input digital radar video signal by a difference in luminance. The purpose of this is to control the afterglow time of the display video signal with an arbitrary time width according to the intensity of the luminance of the incoming digital radar video signal, thereby exciting the operator to detect the target video. is there.

In FIG. 6, after the magnitude comparison between the digital radar video signal 6 and the holding video signal 11 is performed by the magnitude comparison circuit 10 and the storage video signal 12 is generated, the subtraction control signal 14 output from the afterglow time control circuit 13 is used. The reduction of the stored video signal 12 is arbitrarily controlled. By, E, R
The display signal holder 2 outputs the selected coordinate axis radar display signal 7 in the same manner as in the first and second embodiments, and performs a predetermined radar scope display.

FIG. 7 is a detailed diagram of the afterglow time control circuit 13. 36 is a subtraction amount adjustment dial, 37 is a subtraction speed adjustment dial, 38 is a subtraction set value, 39 is a subtraction time interval set value, 40 is an afterglow time calculator, and 41 is an afterglow time set value.

In FIG. 7, by arbitrarily adjusting the subtraction amount adjustment dial 36 and the subtraction speed adjustment dial 37, an optimal afterglow time according to the input state of the radar video signal 6 can be obtained.

Embodiment 4 FIG. FIG. 8 shows the third embodiment.
Embodiment 4 has a configuration in which a plurality of display signal converters and a plurality of display CRTs are provided in the configuration of the radar apparatus according to the first embodiment so that a plurality of radar scope displays can be simultaneously obtained.
3a is a By, R display signal converter, 3b is an E, R display signal converter, and 4a is B
The y and R display CRTs and 4b are E and R display CRTs.

The radar device according to the fourth embodiment can display a plurality of radar scope displays simultaneously,
It is intended to provide more information to the operator.

In FIG. 8, the selected coordinate axis radar display signal 7 is output from one of the By, E, and R display signal holders 2 in a time-division manner so that the characteristics of the radar apparatus according to the third embodiment can be simultaneously obtained. Multiple radar scope displays can be obtained.

[0040]

According to the first aspect, the radar video signal output from the radar signal processing section is sequentially held in the By, E, R display signal holder, and the display coordinate axis selection signal output from the coordinate axis control circuit. Is configured to output a selected coordinate axis radar display signal according to the display application, so that an arbitrary radar scope display can be realized by a set of a common device configuration, and there is an effect that the radar device can be configured at low cost.

According to the second aspect of the present invention, the luminance of the temporally old radar video signal is sequentially reduced by the magnitude comparison circuit, so that the newly input digital radar video signal and the temporally old radar video signal are compared. By identifying or eliminating the held video signal, which is a signal, based on the difference in luminance, each radar video signal can be temporally separated, which has the effect of exciting the operator to detect the target video on the display screen. is there.

According to the third aspect, the afterglow time of the display video signal can be controlled with an arbitrary time width according to the intensity of the luminance of the digital radar video signal input by the afterglow time control circuit. This has the effect of exciting the detection of the target video by the operator on the CRT display screen.

According to the fourth aspect of the invention, it is possible to simultaneously obtain a plurality of radar scope displays while suppressing the scale of the apparatus, and it is possible to provide more information to the operator.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a radar device according to the present invention.

FIG. 2 is a conceptual diagram showing a By, E, and R display signal holder.

FIG. 3 is a detailed diagram showing a coordinate axis control circuit.

FIG. 4 is a configuration diagram showing a second embodiment of the radar device according to the present invention;

FIG. 5 is a detailed diagram illustrating a magnitude comparison circuit.

FIG. 6 is a configuration diagram showing a third embodiment of the radar device according to the present invention.

FIG. 7 is a detailed diagram showing an afterglow time control circuit.

FIG. 8 is a configuration diagram showing a fourth embodiment of the radar apparatus according to the present invention.

FIG. 9 is a schematic configuration diagram illustrating a general radar signal processing unit.

FIG. 10 is a configuration diagram showing a radar apparatus having a conventional electron beam scanning antenna.

[Explanation of symbols]

1 radar signal processing unit, 2 By, E, R display signal holder, 2a By, R display signal holder, 2b E, R display signal holder, 2c By, E display signal holder, 3 display signal converter, 3a By, R display signal converter, 3b
E, R display signal converter, 3c By, E display signal converter, 4 display CRT, 4a By, R display CRT,
4b E / R display CRT, 4c By / E display CR
T, 5 coordinate axis control circuit, 10 magnitude comparison circuit, 3 afterglow time control circuit, 28a By, storage address read counter when R coordinate axis is selected, 28b E, storage address read counter when R coordinate axis is selected, 28c By, E
Storage address read counter at the time of coordinate axis selection, 36
Subtraction amount adjustment dial, 37 Subtraction speed adjustment dial, 4
0 Afterglow time calculator.

Claims (4)

[Claims] 1. A radar signal processing section for generating a digital radar video signal, a By (azimuth), E (high angle), R (distance) display signal holder for holding the digital radar video signal, and a switching operation. A coordinate axis control circuit for generating a display coordinate axis selection signal for selecting any of the By, R coordinate axes, E, R coordinate axes, and By, E coordinate axes; and a By, E, R display signal according to the display coordinate axis selection signal. A radar apparatus comprising: a display signal converter for converting a selected coordinate axis radar display signal output from a holder into a display video signal; and a display for displaying the display video signal. 2. A magnitude comparison between a digital radar video signal V1 output from the radar signal processing unit and a holding video signal V2 output from a By, E, R display signal holding unit, and when V1> V2, V1 is determined. When V1 <V2, V
2. A radar apparatus according to claim 1, further comprising a magnitude comparison circuit for outputting 2-V3 (preset subtraction) as a stored video signal to said By, E, R display signal holding unit. 3. The radar apparatus according to claim 2, further comprising an afterglow time control circuit for outputting a subtraction control signal for controlling the magnitude of the stored video signal output from said magnitude comparison circuit. 4. The display device according to claim 3, further comprising a plurality of display signal converters for converting the selected coordinate axis radar display signal into a display video signal, and a plurality of displays for displaying the display video signal. Radar equipment.