JP3039529B2 - Radar video display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar video display device in a radar system used for air traffic control, and more particularly to a radar video display device capable of suppressing display of unnecessary video in a raster scan type radar display device or the like. Related to the device.

[0002]

2. Description of the Related Art Conventionally, in a raster scan type video display device, a radar video signal in an R-.theta. Coordinate system is converted into data in an XY coordinate system by scan conversion processing means.
This is written in the frame memory corresponding to the display screen on a one-to-one basis, and then the data is read out from the frame memory in synchronization with the TV, and the color conversion and the D / A conversion are executed by the lookup / D / A converter. , And a method of displaying on a display is adopted.

In this case, a radar video signal input to a radar video display device is subjected to radar signal processing to remove unnecessary signals such as clutter and the like, and to a moving target (aircraft or the like) required for air traffic control. It is desirable that only a video signal be extracted as much as possible. The radar video display device performs only a coordinate conversion process on the input radar video signal based on a difference in the display system coordinate system, and converts the received intensity data of the radar video signal to the luminance (color) on the display. Was displayed.

Here, as a display processing technique for processing the reception intensity data of a radar video signal, there is a conventional display processing technique disclosed in, for example, JP-A-5-27009. This relates to a technique for freely controlling the after-image time of radar video, and the after-image display is performed by attenuating the received intensity data of the past radar video signal in radar scanning at a predetermined attenuation rate. Things.

[0005]

However, in the above-mentioned conventional display device, even if the radar video displayed on the display device is one in which unnecessary signals such as clutter are removed by radar signal processing. Depending on various conditions (clutter type, weather, etc.), unnecessary signals that cannot be completely removed often remain. For this reason, in order to facilitate identification of moving targets (aircraft) required for air traffic control,
Further suppression (removal) of unnecessary signals has been desired.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to improve the disadvantages of the prior art, in particular to effectively suppress unnecessary signals of radar video which cannot be eliminated by ordinary radar signal processing, and thereby to reduce the moving target required for air traffic control. It is an object of the present invention to provide a radar video display device capable of facilitating identification and reducing the burden on a controller.

[0007]

In order to achieve the above object, according to each of the first to third aspects of the present invention, a scan converter for converting a radar video in an R-θ coordinate system into an XY coordinate system;
A plurality of radar video frame memories in which radar video data converted into an XY coordinate system is sequentially written, and an image processing frame memory in which image processing data corresponding to each data of the plurality of video data frame memories is written And another image processing data for performing a predetermined operation based on the radar video data read from the above-described radar video frame memory and the image processing data read from the above-described image processing frame memory to suppress unnecessary signals. And an image processing unit for updating the image processing data in the image processing frame memory based on the image processing data.

Further, based on the image processing data updated by the image processing unit, an arithmetic processing unit for arithmetically processing the latest radar video data read from the above-mentioned radar video frame memory and suppressing (removing) unnecessary signals. And a display unit for displaying radar video data output from the arithmetic processing unit, as a common basic configuration.

Therefore, in each of the first to third aspects of the present invention, first, a radar video signal (a radar trigger, a radar azimuth signal, and a radar video) is input to the scan conversion unit, and the display data for the XY coordinates is obtained. After that, it is written to one or the other of the radar video frame memories. At this time, an operation of alternately writing and updating the two radar video frame memories, one and the other, is performed every radar scan, and the display data one radar scan past is temporarily held together with the latest radar video data. Is done.

Next, the image processing unit generates and stores the generated radar video data based on the radar video data stored in the previous radar scan twice from the image processing frame memory using the radar video data in the past one radar scan. The image processing data, which is unnecessary signal suppression data, is updated and written to the image processing frame memory. Also, the latest radar video display data of the other radar video frame memory and the image processing data updated by the above-described image processing unit are read out by TV synchronization for raster scan display as described above, It is input to the arithmetic processing unit.

The arithmetic processing unit performs a predetermined arithmetic operation on the latest radar video data of the other radar video frame memory using image processing data which is unnecessary signal suppression data for video, and determines whether the latest radar video data is unnecessary. The signal is suppressed and sent to the display unit as display data.

The display unit is composed of a display device of a raster scan display system, and displays radar video to a controller. As a result, a traffic controller can perform a traffic control operation using the radar video display in which the unnecessary signal is suppressed, and it becomes easier to grasp information necessary for air traffic control.

Further , the image processing section receives an input from a higher-level device.
One of the radars described above based on predetermined control data
Plays the previous radar video data stored in the video data
To generate image processing data that suppresses unnecessary signals
And use this as the latest image processing data
Update the image processing data in the image processing frame memory
The configuration has a second processing data update function.

Therefore, the image processing data is further stored in the
There is no need to calculate and generate degrees, and image processing
Can be accelerated.

The control data described above is stored in a group specified in advance.
Various unnecessary signals such as land clutter and weather clutter
Specific radar site-specific topography, weather conditions, etc.
Image patterns are stored in a database in advance and pattern recognition
In a recognized form.

Here, a first changeover switch for selectively connecting the plurality of radar video frame memories may be provided between the above-described scan converter and the plurality of radar video frame memories. At the same time, the radar video frame memory storing the latest radar video data among the plurality of radar video frame memories is selectively connected between the aforementioned plurality of radar video frame memories and the aforementioned image processing unit. A second changeover switch may be provided. This is convenient in that a scan converter or an image processor can be quickly connected to a plurality of radar video frame memories.

Each of the first and second changeover switches may be configured to be operable at a predetermined timing of the radar azimuth signal input to the above-described scan conversion unit. By doing so, the configuration of the entire system can be simplified and the operation can be smoothly performed, which is convenient.

According to a fourth aspect of the present invention, there is provided the first aspect of the present invention.
4. The radar video display device according to item 2 or 3, wherein the image processing unit includes the previous radar video data stored in one of the radar video data stored in the plurality of radar video frame memories and the previous radar video data. Based on the image processing data stored in the image processing frame memory, predetermined arithmetic processing is performed to specify an unnecessary signal, and the image processing data in the image processing frame memory is used as the latest image processing data. The configuration is provided with a first image processing data update function for updating.

Therefore, in the invention according to claim 4,
In addition to having the same function as the above-mentioned invention, the unnecessary signal generated fixedly is kept at a fixed position, whereas the display signal is clearly moved and captured. As a result, the change in the position coordinates between the unnecessary signal and the display signal (radar video data) becomes large, and the two can be efficiently sorted, so that the unnecessary signal as the object to be suppressed can be clearly specified. .

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

First, in FIG. 1, reference numeral 1 denotes a scan converter. The scan converter 1 has a function of converting radar video in the R-θ coordinate system into the XY coordinate system. Reference numeral 2 denotes a radar video frame memory unit.
In this embodiment, the radar video frame memory unit 2 is composed of one and the other radar video frame memories 2A and 2B, but may be three or more.

The radar video display data converted into the XY coordinate system by the scan converter 1 is sequentially switched and written into each of the one and the other radar video frame memories 2A and 2B. It has become. Reference numeral 3A indicates a changeover switch in this case.

The embodiment shown in FIG. 1 further includes an image processing frame memory 4 into which predetermined image processing data corresponding to the data of the one or other radar video frame memory 2A or 2B is written. . or,
An image which suppresses an unnecessary signal by performing a predetermined operation based on the radar video data read from the one or the other radar video frame memory 2A or 2B and the image processing data read from the image processing frame memory 4 described above. An image processing unit 4A is provided for forming processing data and updating the image processing data in the image processing frame memory 4 with the image processing data.

Reference numeral 3B denotes a changeover switch for reading radar video data from one or the other of the radar video frame memories 2A and 2B. The changeover switch 3B is equipped between the radar video frame memory section 2 and the images processing section 4A.

Further, in the present embodiment, the latest radar video data read from the above-mentioned radar video frame memory unit 2 is subjected to arithmetic processing based on the image processing data updated by the image processing unit 4A, and an unnecessary signal is generated. Processing unit 5 for suppressing (removing)
Lookup of radar video data output from
And a display unit 7 for inputting and displaying via the / A converter 6 .

Here, the latest display data in the radar video frame memory unit 2 and the image processing frame memory 4
Image processing data in a TV for raster scan display
The data is read out synchronously and the operation is performed by the operation processing unit 5.
This makes it possible to obtain the final radar video data in which unnecessary signals are suppressed from the latest display data.

The radar video data from which the unnecessary signal has been suppressed is converted into luminance (color) by the look-up D / A converter 6 and displayed on the display unit 7. As a result, a traffic controller can perform a traffic control operation using a radar video display in which the unnecessary signal is suppressed, and it becomes easier to grasp information necessary for air traffic control.

Next, the overall operation of the above embodiment will be described. First, a radar video signal (a radar trigger, a radar azimuth signal, and a radar video) is input to a scan conversion unit 1, converted into display data for XY coordinates, and sent to a radar video frame memory unit 2. The data is written to one of the radar video frame memories 2A or the other radar video frame memory 2B.

At this time, an operation of alternately writing and updating one of the two radar video frame memories 2A and 2B for each radar scan is performed, and the latest radar video data and one radar scan past are stored. Is temporarily stored.

For example, the one radar video frame memory 2A shown in FIG. 1 holds radar video data (corresponding to (n-1) described later) one radar scan earlier. Further, the latest radar video data (corresponding to (n) described later) is written in the other radar video frame memory 2B.

The image processing unit 4A uses the radar video data of one radar scan past from one of the radar video frame memories 2A to store the radar data stored in the image processing frame memory 4 in the two previous radar scans. The image processing data (corresponding to (n-2) described later), which is unnecessary signal suppression data generated and stored based on the video data, is updated and written to the image processing frame memory 4. Here, in the image processing by the image processing unit 4A,
Unnecessary signals generated fixedly remain in place, while signals for display are clearly moved and captured, thereby generating unnecessary signals and display signals (radar video data).
And the change on the position coordinates becomes large, and it becomes easy to specify the unnecessary signal.

The latest (n) radar video data in the other radar video frame memory 2B and image processing
The (n-2) image processing data updated by the unit 4A is
As described above, in order to perform raster scan display, the data is read out in synchronization with TV and input to the arithmetic processing unit 5. The arithmetic processing unit 5 suppresses an unnecessary signal of the latest radar video data by performing an operation between the latest (n) radar video data and the (n-2) image processing data which is unnecessary signal suppression data for video. Then, the display data is output to the lookup / D / A converter 6 at the next stage.

The look-up D / A converter 6 converts the radar video data sent from the arithmetic processing unit 5 into an analog luminance (color) signal to be actually displayed on the display unit 7 as described above. I do. Then, the display unit 7 is driven with the converted signal.

Here, the display unit 7 is composed of a display device of a raster scan display system, and displays radar video to a controller. As a result, a traffic controller can perform a traffic control operation using a radar video display in which the unnecessary signal is suppressed, and it becomes easier to grasp information necessary for air traffic control.

Next, the operation of suppressing unnecessary signals of radar video in this embodiment will be described in more detail.

FIG. 2 is an image showing changes in radar video display data and the like in the radar video frame memories 2A and 2B in the unnecessary signal suppressing operation, in which (a) to (e) in FIG. The grids in parentheses indicate display pixels. or,
The numbers in the grid indicate the radar video data (reception intensity) and the number of radar scans (see remark 1 in FIG. 2B).

When the input example of the radar video signal in FIG. 2 is followed in time series, FIG. 2 (b) shows two times before (two times) of the radar video data (display data) sequentially sent by radar scanning. The image processing data generated from the radar video data (display data) of the previous radar scan is shown. This image processing data is stored two times before (2
Since the image processing data is generated based on the display data of the previous radar scan, it is referred to as “(n−2) image processing data”. The (n-2) image processing data is stored in the image processing frame memory 4.

In the image processing data shown in (b) of FIG. 2, there is an island of data "3" at the lower left, and as shown in the denominator, the island of "3" has a past radar scan of "x". This shows that the same data is present at the same position even if it is performed successively. Also, (b) in FIG.
In the image processing data shown in (5), there is data of "5" at the upper left, and since the denominator is "1", it is understood that this is the first video input at the time of the radar scan.

FIG. 2A shows the display data of the previous (one previous) radar scan among the display data sequentially sent by the radar scan. Since this display data is the display data of the previous (one time before) radar scan, it is set as "(n-1) data" and stored in the radar video frame memory 2A.

In the figure, the island of the data of "3", which was at the lower left two times before, still exists, and the data of "5", which was at the upper left, has moved slightly to the lower right. Finally, (c) in FIG. 2 shows the latest display data in the radar video frame memory 2B. This latest display data,
This is referred to as “(n) data”. The island of data "3" that was at the lower left last time continues to exist, and the data of "5" that was at the upper left moves further to the lower right and overlaps the island of data "3". .

Here, the operation of suppressing the unnecessary signal with respect to the above-mentioned input example of the radar video signal will be described in detail.

The image processing section 4A is in FIG. 2 (a) to one indicating the radar video for off the frame memory 2A of (n-
1) Based on the data, the (n-2) image processing data in the image processing frame memory 4 shown in (b) of FIG. 2 is arithmetically processed to generate the image processing data shown in (d) of FIG. I do. The image processing data shown in (d) in FIG. 2 is referred to as “(n−1) image processing data” because it is image processing data formed based on the previous (one time before) scan data.

In this case, the (n-1) image processing data is generated by first comparing the video data values of the (n-2) image processing data and the (n-1) data, (The same pixel and the same data), and (n−
1) This is performed by adding data of the number of radar scans corresponding to each pixel video data of the data. As a result, (n-1) image processing data shown in FIG. 2D is obtained, and at the same time, the contents of the image processing frame memory 4 are updated. In the figure, y = x + 1 indicates that data in a state where the radar scan has advanced once is used.

Next, the processor 5, and (n) data <br/> other side of Les Dabideo frame memory 2B of (c) in FIG. 2, FIG. 2 (d) (n-1 2) The arithmetic processing is performed with the image processing data, thereby generating the display data for the radar video shown in (e) of FIG. This arithmetic processing unit 5
The display data (display data) generated in step (1) is sent to the lookup / D / A converter 6 at the next stage.

Here, the arithmetic processing in the arithmetic processing section 5 is based on the video data value of each pixel of (n) data,
2) By subtracting the video data value of each corresponding pixel of the image processing data, the above-described display data is obtained. At this time, the video data values are also compared at the same time, and if the video data values of the (n) data and the (n-2) image processing data are different from each other beyond a preset range, the above-described subtraction is not performed. Perform processing. And
As a result of executing this arithmetic processing, display data shown in (e) of FIG. 2 can be obtained.

By performing the above-described image processing and arithmetic processing, video data that is continuously present at the same position with the same video data value every radar scan is suppressed, and the video data that is changing (moving) every radar scan is reduced. Display data in which only data remains can be obtained.

Further, the image processing in the present invention, prior to addition to the suppression means of the unnecessary signal due to predicate image processing, various unwanted signal (ground clutter, Wezakuratta etc.) and the terrain for each radar site, the image to be suppressed by weather conditions, etc. The configuration is such that a pattern is made into a database in advance, and control data subjected to pattern recognition is used . The book
Image processing in the invention is limited to the specific examples described above.
Not something. Further, in the above embodiment, the case where two frame memories are provided is exemplified, but three or more frame memories may be provided.

[0048]

As described above, according to the present invention,
By the operation of the image processing unit and the arithmetic processing unit, it is possible to reliably suppress (removal of unnecessary signals) the input of a radar video signal in which unnecessary signals that cannot be completely removed by radar signal processing remain, thereby suppressing unnecessary signals. A clear radar video display can be sent to the display unit, which allows the display unit to effectively display moving targets (aircraft) required for air traffic control and improves the efficiency of air traffic control operations. An excellent radar video display device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram schematically showing the operation of the system shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scan conversion part 2 Frame memory 2A One radar video frame memory 2B The other radar video frame memory 3A, 3B changeover switch 4 Image processing frame memory 4A Image processing part 5 Arithmetic processing part 6 Look-up D / A converter 7 Display

Continuation of the front page (56) References JP-A-2-249885 (JP, A) JP-A-61-178679 (JP, A) JP-A-61-120983 (JP, A) JP-A-60-219576 (JP, A) JP-A-10-10226 (JP, A) JP-A-6-82548 (JP, A) JP-A-9-127242 (JP, A) JP-A-6-130145 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01S ⁷ /00-7/42 G01S 13/00-13/95

Claims (4)

(57) [Claims] 1. A radar video in an R-θ coordinate system is converted to an X-Y
A scan converter for converting to a coordinate system, and a
Multiple radar video display data
Radar video frame memory and multiple radar video
Image processing data corresponding to each data in the
A frame memory for image processing in which data is written,
Radar video read from the radar video frame memory
Video data and read from the image processing frame memory
A predetermined operation is performed based on the
Generate other image processing data for signal required suppression and
Image processing in the image processing frame memory based on the
Image processing unit that updates physical dataAnd thisAccording to the image processing unit
Based on the updated image processing data.
The latest radar video read from the frame memory
An arithmetic processing unit that processes arithmetic data and suppresses unnecessary signals
And the radar video data output from this processing unit
DisplayAnd a display unit, The image processing unit includes a predetermined control data input from a higher-level device.
Data in the one radar video data based on the
Unnecessary signal by calculating the previous radar video data
Generate image processing data that suppresses
The image processing frame memory as image processing data of
Processing data updater for updating image processing data in the device
Noh, The control data includes a ground clutter specified in advance,
Various unnecessary signals such as weather clutter and radar site
Specific image patterns caused by terrain, weather conditions, etc. are predicted.
Database and pattern-recognized form
Is,  A radar video display device. 2. A method according to claim 1, further comprising: a first switch for selectively connecting the plurality of radar video frame memories between the scan conversion unit and the plurality of radar video frame memories. A second changeover switch for selectively connecting a radar video frame memory in which the latest radar video data is stored among a plurality of radar video frame memories is provided between the frame memory and the image processing unit. The radar video display device according to claim 1, wherein: 3. The first and second selector switches,
3. The apparatus according to claim 2, wherein the apparatus is operable at the timing of a radar trigger input to the scan converter.
A radar video display as described. 4. An image processing unit, comprising: a last radar video data stored in one of the plurality of radar video frame memories;
Based on the image processing data stored in the image processing frame memory, predetermined arithmetic processing is performed to generate image processing data for suppressing unnecessary signals, and the image processing data is used as the latest image processing data. 4. The radar video display device according to claim 1, further comprising a first processing data update function for updating image processing data in a memory.