JPH09288166A - Radar scanning conversion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radar scanning conversion apparatus by which signals used to display a plurality of pieces of radar image data can be generated, when a plurality of rotary radar image data to be inputted sequentially by a polar coordinate address are converted into an orthogonal coordinate address so as to perform an interpolation processing operation without any moire, in such a way that they are stored in a frame memory so as to be converted into a display signal. SOLUTION: Frame memories 4A, 4B, 4C by which data by interpolation-data generation parts 1A, 1B, 1C are stored in addresses indicated by interpolation- data generation parts 3A, 3B, 3C are installed. A data mixer 6 in which data in the same address stored in the frame memories 4A, 4B, 4C are mixed so as to output data is installed. The data mixer 6 compares the magnitude of radar image data which are read out from the frame memories in a plurality so as to output largest data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar scan conversion device having a plurality of radar image data inputs, a coordinate conversion unit, and a frame memory.

[0002]

2. Description of the Related Art FIG. 13 is a block diagram showing a conventional radar scan conversion device. In the figure, the input data of the three systems of radar is data of the same target obtained by searching different areas by the three systems of radar. 1A, 1
B and 1C are interpolations for generating interpolated coordinate data on Cartesian coordinates from resolutions on Cartesian coordinates obtained from distance resolution and angular resolution when storing coordinate-converted radar image data in frame memories 4A, 4B, and 4C. Data generator, 2
A, 2B and 2C are coordinate conversion units for converting polar coordinates represented by distance data to the target and angle data with respect to the target to corresponding Cartesian coordinates on the display screen, 3A, 3B and 3C are frame memories 4A for interpolated coordinate data, Interpolation address generators 4A, 4B and 4C for generating interpolated values of radar image data stored at addresses 4B and 4C are frames for storing radar image data at addresses converted into corresponding orthogonal coordinates on the display screen. A memory, 12 is a signal selection unit for selecting and outputting any one of the three signals output from the frame memory, and 7 is sequentially read at a timing for displaying the radar image data stored in the frame memory to be a display signal. It is a display signal converter for conversion.

The conventional radar scanning conversion device is constructed as described above, and the angle data and the distance data are input at the timing synchronized with the scanning direction of the antenna. The coordinate conversion units 2A, 2B and 2C convert the angle data and the distance data into rectangular coordinate addresses (X, Y) and output them. The interpolation address generators 3A, 3B, 3C sequentially output the interpolation addresses from the rectangular coordinate address (X, Y). At this time, the interpolation data generators 1A, 1B and 1C hold the radar image and output it in synchronization with the output of the interpolation address from the interpolation address generators 3A, 3B and 3C. At this time, for example, the upper left of the frame memories 4A, 4B, 4C is set as the origin, the right direction is converted as the positive direction of the X axis, and the downward direction is converted as the positive direction of the Y axis. The frame memories 4A, 4B and 4C are interpolated address generators 3A and 3C.
The radar image data is stored at an address corresponding to the rectangular coordinate address (X, Y) output from B and 3C. The data stored in the frame memories 4A, 4B, and 4C is output to the display signal conversion unit by the signal selection unit 11 selecting one of the three inputs. The display signal converting unit 7 displays the radar image data stored in any one of the frame memories 4A, 4B and 4C of one system selected by the signal selecting unit 11 from the upper left origin in order to display the radar image data on the raster scanning display device. It is read out sequentially and converted into a display signal.
As a result, the radar image data can be output as a display signal at a timing synchronized with the scanning of the radar.

FIG. 14 shows, for example, a PPI (Plan Position Indi) centering on (X0, Y0) on the screen.
FIG. 6 is a diagram showing a relationship between polar coordinates and Cartesian coordinates when performing a (display) display. In the figure, 40 is the origin on the display screen, 41 is the origin of the PPI display, 42 is radar image data in the orthogonal coordinates of the angle data B and the distance data R, 43
Is a circle showing the outermost periphery of the PPI display.

Here, the maximum value of the distance data R is Rmax,
When the radius of the PPI display on the frame memories 4A, 4B and 4C is Prmax and the maximum value of the angle data is Bmax, the radar image data of the distance data R and the angle data B is converted into a rectangular coordinate address by the following equation.

[0006]

[Equation 1]

[0007]

[Equation 2]

However, ΔR indicates the distance resolution, and Δ
B represents the angular resolution and is represented by the following equation.

[0009]

(Equation 3)

[0010]

(Equation 4)

[0011]

In the conventional radar scanning conversion device as described above, one system of radar image data is selected and displayed from a plurality of rotary radar image data which are sequentially input at polar coordinate addresses. .

To simplify the description now, the angle data B
a = 30 degrees, angle data Bb = 210 degrees, angle data B
Radar image data D when c = 300 degrees is input
Values of a, Db, Dc and distance data Ra, Rb, Rc are shown in the following table as an example. Here, the range of the data value is 0 to 10 for the radar image data Da, Db, Dc, 0 to 60 for the distance data Ra, Rb, Rc, and the angle data B, respectively.
Let a, Bb, and Bc be 0 to 360 degrees.

[0013]

[Table 1]

FIG. 15 shows an example of PPI display when the signals of the radar image data Da, the distance data Ra and the angle data Ba shown in Table 1 (a) are selected. In the figure, 40 is the origin on the display screen, 41 is the origin of PPI display, 44 is angle data 30 degrees, distance data 41 to 50, and brightness data 9
Radar image data in the orthogonal coordinates of, and 43 is a circle indicating the outermost periphery of the PPI display.

FIG. 16 shows an example of the PPI display when the signals of the radar image data Db, the distance data Rb and the angle data Bb shown in Table 1 (b) are selected. In the figure, 40 is the origin on the display screen, 41 is the origin of the PPI display, 45 is the radar image data in the orthogonal coordinates of the angle data 210 degrees, the distance data 21 to 30, and the brightness data 9, 43 is the PPI.
It is a circle showing the outermost periphery of the display.

FIG. 17 shows an example of the PPI display when the signals of the radar image data Dc, the distance data Rc and the angle data Bc shown in Table 1 (c) are selected. In the figure, 40 is the origin on the display screen, 41 is the origin of the PPI display, 46 is the radar image data in the orthogonal coordinates of the angle data 300 degrees, the distance data 31 to 40, and the brightness data 9, 43 is the PPI.
It is a circle showing the outermost periphery of the display.

As shown in FIGS. 15, 16 and 17, the operator can select only the display of arbitrary one-system radar image data. For this reason, the targets detected by other systems cannot be displayed at the same time, so that there is a problem that the operator cannot find the targets.

To simplify the description now, the angle data B
The values of the radar image data Da and the distance data Ra at a = 30 to 36 degrees are shown in the following table as an example. Here, the range of data values is 0 to 10 for radar image data Da, 0 to 60 for distance data Ra, and 0 to 360 for angle data Ba.
Degree.

[0019]

[Table 2]

FIG. 18 shows the radar image data D shown in Table 2.
An example of PPI display when signals a, distance data Ra, and angle data Ba are selected is shown. In the figure, 40 is the origin on the display screen, 41 is the origin of the PPI display, 47 is radar image data showing noise in Cartesian coordinates, 48 is radar image data showing the target in Cartesian coordinates, 43
Is a circle showing the outermost periphery of the PPI display.

When the radar image data is output as a display signal, the radar image data is output as the display brightness as it is, so that it is not possible to display only the data above or below a certain signal level. Therefore, as shown in FIG.
The data 47 indicating the noise and the data 48 indicating the target
However, there is a problem in that the visibility is impaired because it is hidden.

The present invention has been made to solve the above problems, and radar scanning conversion for processing radar image data of a plurality of systems input at a timing synchronized with the scanning direction of the antenna and enabling simultaneous display. A device is provided.

Further, the present invention provides a radar display device for displaying a radar image which is easy for an operator to see, by providing a data luminance conversion section for converting the radar image data into luminance in the preceding stage of the display signal conversion section.

[0024]

In the radar scanning conversion apparatus according to the present invention, a means for comparing the magnitudes of radar image data read from a plurality of frame memories and outputting the largest data is provided in the preceding stage of the display signal converting section. It is a thing.

Further, the present invention adds means for comparing the magnitudes and outputting the largest data and means for controlling the added data by a selection signal.

According to the present invention, means for converting the radar image data into the brightness data of the pattern prepared in advance is provided in the preceding stage of the display signal converting section.

Further, the present invention adds means for obtaining an average value of radar image data and outputting radar image data of the average value or more by a control signal.

Further, according to the present invention, the average value of the radar image data and the means for controlling the added data by means of performing the magnitude comparison and outputting the maximum data and the average value of the radar image data are obtained, and the radar image data above the average value is obtained by the control signal. A means for outputting is added.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. FIG. 1 is a configuration diagram showing Embodiment 1 of the present invention. 1 to 4 and 7 in the figure are the same as those of the conventional device. Reference numeral 6 denotes a data mixer unit that calculates radar image data read from the frame memories 4A, 4B, and 4C.

The data mixer section 6 includes a frame memory 4A,
The largest value of the data read from 4B and 4C is selected and sent to the display signal conversion unit 7.

FIG. 2 is a block diagram showing an example of the data mixer section 6. In the figure, 13 is a comparator that compares the data read from the frame memories 4A and 4B, and outputs a signal when the data in the frame memory 4A is larger than the data in the frame memory 4B, and 14 is the frame memories 4A and 4B.
The data read from B is input to the comparator 1
A selector for outputting the data of the frame memory 4A when there is an output signal of 3 and selecting the data of the frame memory 4B when the signal from the comparator 13 is not output,
Reference numeral 15 is a comparator that compares the data read from the frame memory 4C and the selector 14 and outputs a signal when the data read from the selector 14 is larger than the data in the frame memory 4C. 16 is a frame memory 4
When C and the data read from the selector 14 are input and the output signal of the comparator 15 is present, the selector 1
4 is a selector for selecting the data of the frame memory 4C when the data of 4 is output and the signal from the comparator 15 is not output.

The data mixer section 6 configured as described above.
At, the data read from the frame memories 4A, 4B, 4C are compared. Frame memory 4 here
The size of the data of A, 4B, 4C is set to the frame memory 4A
>4B> 4C. At this time, since the data in the frame memory 4A is larger than that in the frame memory 4B, the comparator 13 outputs a signal. The selector 14 has
Similarly to the comparator 13, the data read from the frame memories 4A and 4B is input to the comparator 1
Since there are 3 signal outputs, the data in the frame memory 4A is output. The frame memory 4A data output from the selector 14 and the data in the frame memory 4C are input to the comparator 15, and a signal is output because the frame memory 4A data output from the selector 14 is larger than the data in the frame memory 4C. . Similarly to the comparator 15, the selector 16 receives the data of the frame memory 4A and the data of the frame memory 4C output from the selector 14, and since the signal output of the comparator 15 is output, the frame memory 4 output from the selector 14
A data is output. In this way, the data mixer unit 6
Selects and outputs the largest value among the data stored in the frame memories 4A, 4B and 4C.

In the radar scanning conversion device constructed as described above, first, when the distance data 0, the angle data 0 and the radar image data thereof are input to each system at the timing synchronized with the rotation of the antenna, the coordinate conversion unit 2A. , 2
B and 2C are distance data R according to "Equation 1" and "Equation 2",
The angle data B is converted into a rectangular coordinate address (X, Y). The interpolation address generators 3A, 3B, 3C sequentially output the interpolation addresses from the rectangular coordinate address (X, Y). At this time, the interpolation data generators 1A, 1B, 1C hold the radar image data, and the interpolation address generators 1A, 1B
It is output in synchronization with the output of the interpolation address from B and 1C. The frame memory 4A stores the radar image data Da that is synchronously input from the interpolation address generating unit 3A, and the frame memory 4B stores the radar image data Db that is synchronously input from the interpolation address generating unit 3B.
C stores the radar image data Dc that is synchronously input from the interpolation address generating unit 3C.

Next, when the distance data is updated and the distance data 1, the angle data 0 and the radar image data thereof are input, the coordinate conversion units 2A, 2B and 2C are "numerical 1" and "numerical" like the above. According to 2 ", the distance data R and the angle data B are converted into the rectangular coordinate address (X, Y). Interpolation address generators 3A, 3B and 3C are orthogonal coordinate addresses (X, Y)
To sequentially output interpolation addresses. At this time, the interpolation data generators 1A, 1B and 1C hold the radar image data and output it in synchronization with the output of the interpolation address from the interpolation address generators 1A, 1B and 1C. Frame memory 4
A is the radar image data Da that is synchronously input from the interpolation address generating unit 3A, the frame memory 4B is the radar image data Db that is synchronously input from the interpolation address generating unit 3B, and the frame memory 4C is the interpolation address. Radar image data Dc synchronously input from the generator 3C
To store.

By continuing the above operation up to the maximum value of the distance data, the processing of 0 of the angle data is completed. By performing these processes up to the maximum value of the angle data, all the radar image data and its interpolation data are stored in the frame memory 4A,
You can write to 4B and 4C. Data mixer section 6
Selects the largest value of the radar image data stored in the frame memories 4A, 4B, 4C sequentially read from the upper left origin for display on the raster scanning display device and outputs the selected value. The display signal conversion unit 7 sequentially reads the radar image data output from the data mixer unit 6 from the upper left origin and converts it into a display signal in order to display it on the display device.

Embodiment 2 In the synthesis of radar image data input from a plurality of systems in the above-described first embodiment, the largest value of the input data is output in the case of the same coordinate, but in the present embodiment, the data of the same coordinate is most output by the selection signal. It controls whether a large value is selected and output or an added value is output.

FIG. 3 is a block diagram showing a second embodiment of the present invention. 1 to 4 and 7 in the figure are the same as those of the conventional device. Reference numeral 8 denotes a data mixer unit for changing the calculation method of the radar image data read from the frame memories 4A, 4B and 4C depending on the presence or absence of a selection signal.

The data mixer section 8 selects and outputs the largest value of the data read from the frame memories 4A, 4B and 4C according to a selection signal from the outside or outputs it from the frame memories 4A, 4B and 4C. Whether to output a value obtained by adding all the data is selected and sent to the display signal converter 7.

FIG. 4 is a block diagram showing an example of the data mixer section 8. In the figure, 13 is a comparator that compares the data read from the frame memories 4A and 4B, and outputs a signal when the data in the frame memory 4A is larger than the data in the frame memory 4B, and 14 is the frame memories 4A and 4B.
The data read from B is input to the comparator 1
A selector for outputting the data of the frame memory 4A when there is an output signal of 3 and selecting the data of the frame memory 4B when the signal from the comparator 13 is not output,
Reference numeral 15 is a comparator that compares the data read from the frame memory 4C and the selector 14 and outputs a signal when the data read from the selector 14 is larger than the data in the frame memory 4C. 16 is a frame memory 4
When C and the data read from the selector 14 are input and the output signal of the comparator 15 is present, the selector 1
A selector for selecting the data of the frame memory 4C when the data of 4 is output and the signal from the comparator 15 is not output, an adder 17 for adding the data read from the frame memories 4A, 4B, 4C, and an adder 18 It is a selector that inputs the output of 17 and the data read from the selector 16, outputs the data of the selector 16 when there is a selection signal, and selects the data of the adder 17 when the selection signal is not output.

The data mixer section 8 configured as described above.
At, the data read from the frame memories 4A, 4B, 4C are compared. Frame memory 4 here
The size of the data of A, 4B, 4C is set to the frame memory 4A
>4B> 4C. At this time, since the data in the frame memory 4A is larger than that in the frame memory 4B, the comparator 13 outputs a signal. The selector 14 has
Similarly to the comparator 13, the data read from the frame memories 4A and 4B is input to the comparator 1
Since there are 3 signal outputs, the data in the frame memory 4A is output. The frame memory 4A data output from the selector 14 and the data in the frame memory 4C are input to the comparator 15, and a signal is output because the frame memory 4A data output from the selector 14 is larger than the data in the frame memory 4C. . Similarly to the comparator 15, the selector 16 receives the data of the frame memory 4A and the data of the frame memory 4C output from the selector 14, and since the signal output of the comparator 15 is output, the frame memory 4 output from the selector 14
A data is output. The data read from the frame memories 4A, 4B, and 4C is input to the adder 17, and the value obtained by the addition processing is output. The data output from the selector 16 and the data output from the adder 17 are input to the selector 18, and the data of the selector 16 is output when there is a selection signal and the data of the adder 17 is output when the selection signal is not output. Is output.

FIG. 5 is a diagram showing an example of the distance and the signal brightness at a certain angle in FIG. FIG. 5A shows radar image data Da at a certain angle, and FIG. 5B shows FIG.
FIG. 5 shows radar image data Db at the same angle as in FIG.
5C shows radar image data Dc at the same angle as FIG.
And the relationship of the magnitude of luminance is (a) =
(C), (a)> (b).

FIG. 5 (d) shows that when there is a selection signal from the outside such as an operator who is monitoring the radar scanning conversion device, that is, most of the data of the same coordinates stored in the frame memories 4A, 4B and 4C. It shows a radar image outputting a large value.

FIG. 5E shows a radar image which is output when there is no selection signal from the outside, that is, data of the same coordinates stored in the frame memories 4A, 4B and 4C are added and output. .

In the radar scanning conversion device constructed as described above, first, when the distance data 0, the angle data 0 and the radar image data are input to each system at the timing synchronized with the rotation of the antenna, the coordinate conversion unit 2A. , 2
B and 2C are distance data R according to "Equation 1" and "Equation 2",
The angle data B is converted into a rectangular coordinate address (X, Y). The interpolation address generators 3A, 3B, 3C sequentially output the interpolation addresses from the rectangular coordinate address (X, Y). At this time, the interpolation data generators 1A, 1B, 1C hold the radar image data, and the interpolation address generators 1A, 1B
It is output in synchronization with the output of the interpolation address from B and 1C. The frame memory 4A stores the radar image data Da that is synchronously input from the interpolation address generating unit 3A, and the frame memory 4B stores the radar image data Db that is synchronously input from the interpolation address generating unit 3B.
C stores the radar image data Dc that is synchronously input from the interpolation address generating unit 3C.

Next, when the distance data is updated and the distance data 1, the angle data 0 and the radar image data thereof are input, the coordinate conversion units 2A, 2B and 2C perform the "numeral 1" and "numerical number" in the same manner as above. According to 2 ", the distance data R and the angle data B are converted into the rectangular coordinate address (X, Y). Interpolation address generators 3A, 3B and 3C are orthogonal coordinate addresses (X, Y)
To sequentially output interpolation addresses. At this time, the interpolation data generators 1A, 1B and 1C hold the radar image data and output it in synchronization with the output of the interpolation address from the interpolation address generators 1A, 1B and 1C. Frame memory 4
A is the radar image data Da that is synchronously input from the interpolation address generating unit 3A, the frame memory 4B is the radar image data Db that is synchronously input from the interpolation address generating unit 3B, and the frame memory 4C is the interpolation address. Radar image data Dc synchronously input from the generator 3C
To store.

By continuing the above operation up to the maximum value of the distance data, the processing of 0 of the angle data is completed. By performing these processes up to the maximum value of the angle data, all the radar image data and its interpolation data are stored in the frame memory 4A,
You can write to 4B and 4C. Data mixer section 8
When a selection signal is input, is read out sequentially from the upper left origin for display on a raster scanning display device, selects the largest value of the radar image data stored in the frame memories 4A, 4B, 4C and outputs it. , When no selection signal is input, the frame memories 4A, 4B are sequentially read from the upper left origin for display on the raster scanning display device.
A value obtained by adding the radar image data stored in 4C is selected and output. The display signal conversion unit 7 sequentially reads the radar image data output from the data mixer unit 6 from the upper left origin and converts it into a display signal in order to display it on the display device.

Embodiment 3 In the synthesis of radar image data input from a plurality of systems in the above-described first embodiment, the largest value of the input data is output in the case of the same coordinates, but in the present embodiment, the selection signal and the data mixer unit output. This data is used as the address of the brightness data table, and the data of the prepared pattern is stored at the specified address and converted into the brightness data.

FIG. 6 is a block diagram showing a third embodiment of the present invention. In the figure, 1-4, 6, and 7 are the same as those in the first embodiment. Reference numeral 9 denotes a data brightness conversion unit that converts the data output from the data mixer unit 6 into an address by a selection signal input from the outside and converts the data into new brightness data.

The data / luminance converter 9 converts the data output from the data mixer 6 as an address, converts it into arbitrary data, and sends it as radar image data.

FIG. 7 is a block diagram showing an example of the data brightness conversion section 9. In the figure, 19 is an address generator for generating selection signals A, B, C and the data output from the data mixer section 6 to generate an address corresponding to a luminance data table, and 20 is an address generator.
A memory storing data corresponding to the address output from the address generator 19, 21 is a luminance data table selected when the selection signal A is output, and 22 is selected when the selection signal B is output. Brightness data table,
Reference numeral 23 is a brightness data table selected when the selection signal C is output.

In the data brightness conversion section 9 configured as described above, an address is generated by a combination of the selection signals A, B and C and the data output from the data mixer section 6. When the selection signal A is output and the selection signals B and C are not output, the address generator 19 outputs an address for selecting the luminance data table 21, and the selection signal B is output.
When there is no output of the selection signals A and C and there is no output of the selection signals A and C, the address generator 19 outputs an address for selecting the luminance data table 22, and there is an output of the selection signal C and no output of the selection signals A and B. At this time, the address generator 19 outputs an address for selecting the luminance data table 23. The address output from the address generator 19 is input to the memory 20, and the data stored in the address is output as luminance data. The brightness data tables 21, 22, and 23 are obtained by dividing the memory 20 into three parts, and output the stored data when the corresponding address is output from the address generator 19.

FIG. 8 is a diagram showing an example of the luminance data tables 21, 22, 23 in the memory 20 in FIG. In the figure, 24 is for converting a small address to a large luminance, 25 is for converting a large address to a small luminance, and 26 is for a small address to some extent, the luminance is kept at 0 and the address is a constant value. The brightness is converted from the point beyond.

In the radar scanning conversion device constructed as described above, first, when the distance data 0, the angle data 0 and the radar image data thereof are input to each system at the timing synchronized with the rotation of the antenna, the coordinate conversion unit 2A. , 2
B and 2C are distance data R according to "Equation 1" and "Equation 2",
The angle data B is converted into a rectangular coordinate address (X, Y). The interpolation address generators 3A, 3B, 3C sequentially output the interpolation addresses from the rectangular coordinate address (X, Y). At this time, the interpolation data generators 1A, 1B, 1C hold the radar image data, and the interpolation address generators 1A, 1B
It is output in synchronization with the output of the interpolation address from B and 1C. The frame memory 4A stores the radar image data Da that is synchronously input from the interpolation address generating unit 3A, and the frame memory 4B stores the radar image data Db that is synchronously input from the interpolation address generating unit 3B.
C stores the radar image data Dc that is synchronously input from the interpolation address generating unit 3C.

Next, when the distance data is updated and the distance data 1, the angle data 0 and the radar image data thereof are input, the coordinate conversion sections 2A, 2B and 2C are "numerical 1" and "numeral" in the same manner as above. According to 2 ", the distance data R and the angle data B are converted into the rectangular coordinate address (X, Y). Interpolation address generators 3A, 3B and 3C are orthogonal coordinate addresses (X, Y)
To sequentially output interpolation addresses. At this time, the interpolation data generators 1A, 1B and 1C hold the radar image data and output it in synchronization with the output of the interpolation address from the interpolation address generators 1A, 1B and 1C. Frame memory 4
A is the radar image data Da that is synchronously input from the interpolation address generating unit 3A, the frame memory 4B is the radar image data Db that is synchronously input from the interpolation address generating unit 3B, and the frame memory 4C is the interpolation address. Radar image data Dc synchronously input from the generator 3C
To store.

By continuing the above operation up to the maximum value of the distance data, the processing of 0 of the angle data is completed. By performing these processes up to the maximum value of the angle data, all the radar image data and its interpolation data are stored in the frame memory 4A,
You can write to 4B and 4C. Data mixer section 6
Selects the largest value of the radar image data stored in the frame memories 4A, 4B, 4C sequentially read from the upper left origin for display on the raster scanning display device and outputs the selected value. The data brightness conversion unit 9 converts the selection signal input from the outside and the brightness data output from the data mixer unit 6 into the brightness data selected by a predetermined conversion method and outputs the brightness data. The output signal conversion unit 7 sequentially reads the radar image data output from the data mixer unit 6 from the upper left origin and converts it into a display signal in order to display the radar image data on the display device.

Embodiment 4 In the synthesis of radar image data input from a plurality of systems in the above-described first embodiment, the largest value of the input data is output in the case of the same coordinates, but in the present embodiment, the data output from the data mixer unit is output. This is to add, divide the added value by the number of data to obtain an average value, and output the data equal to or higher than the average value obtained by the control signal.

FIG. 9 is a block diagram showing a fourth embodiment of the present invention. In the figure, 1-4, 6, and 7 are the same as those in the first embodiment. Reference numeral 10 denotes a data brightness conversion unit that calculates an average value of data output from the data mixer unit 6 by a control signal input from the outside and converts the average value into new data.

The data / luminance conversion unit 10 includes a data mixer unit 6
The data output from the above is added to calculate an average value, and the luminance of a value below the average is set as 0 data, and the data above the reading average value is transmitted as radar image data.

FIG. 10 is a block diagram showing an example of the data brightness conversion section 10. In the figure, 27 is a switch for outputting a signal while an external control signal is input, 28 is an adder for adding the radar image data input via the switch 27 and the previous radar image data, and 29 is an input. A comparator for comparing the radar image data with the 0 data and outputting a signal when the data is larger than the 0 data, 30 is a counter for counting the signal of the comparator, and 31 is for inputting a control signal from the outside. A switch that does not output a signal, 32 is a divider that divides the output of the adder 28 by the value of the counter 30, and 33 is a data generator that stores data at a predetermined address from the value output from the divider 32. is there.

In the data / luminance converting section 10 configured as described above, when the control signal is output, the switch 27 outputs the radar image data to the adder 28 and the comparator 29. The adder 28 sequentially adds the input radar image data to the previous value and outputs it. The comparator 29 compares the input radar image data with 0 data and outputs a signal when the value is larger than 0 data. The counter 30 counts the number of outputs from the comparator 29 and outputs a value.
The switch 31 is a counter 3 when there is no control signal output.
Output a value of 0. The divider 32 divides the data output from the adder 28 by the value output from the counter 30 and outputs the result. When the average value of the radar image data output from the divider 32 is input, the data generator 33 stores 0 data in the address below the average value and stores the data corresponding to the address in the data above the average value. When image data is input, the data is treated as an address and corresponding data is output as luminance data.

FIG. 11 is a diagram showing an example of the distance and the signal brightness at a certain angle in FIG. 3 of FIG. 11 (a)
4 shows the radar image data at a certain angle,
Reference numeral 35 denotes the average value of the luminance of the radar image data 34, and 36 in FIG. 11B indicates that the radar image data below the average value 35 is 0 from the radar image data 34 in FIG. 11A. It was done.

In the radar scanning conversion device constructed as described above, first, when the distance data 0, the angle data 0 and the radar image data are input to each system at the timing synchronized with the rotation of the antenna, the coordinate conversion unit 2A. , 2
B and 2C are distance data R according to "Equation 1" and "Equation 2",
The angle data B is converted into a rectangular coordinate address (X, Y). The interpolation address generators 3A, 3B, 3C sequentially output the interpolation addresses from the rectangular coordinate address (X, Y). At this time, the interpolation data generators 1A, 1B, 1C hold the radar image data, and the interpolation address generators 1A, 1B
It is output in synchronization with the output of the interpolation address from B and 1C. The frame memory 4A stores the radar image data Da that is synchronously input from the interpolation address generating unit 3A, and the frame memory 4B stores the radar image data Db that is synchronously input from the interpolation address generating unit 3B.
C stores the radar image data Dc that is synchronously input from the interpolation address generating unit 3C.

Next, when the distance data is updated and the distance data of 1, the angle data of 0 and the radar image data thereof are input, the coordinate conversion units 2A, 2B and 2C are "numerical 1" and "numeral" in the same manner as described above. According to 2 ", the distance data R and the angle data B are converted into the rectangular coordinate address (X, Y). Interpolation address generators 3A, 3B and 3C are orthogonal coordinate addresses (X, Y)
To sequentially output interpolation addresses. At this time, the interpolation data generators 1A, 1B and 1C hold the radar image data and output it in synchronization with the output of the interpolation address from the interpolation address generators 1A, 1B and 1C. Frame memory 4
A is the radar image data Da that is synchronously input from the interpolation address generating unit 3A, the frame memory 4B is the radar image data Db that is synchronously input from the interpolation address generating unit 3B, and the frame memory 4C is the interpolation address. Radar image data Dc synchronously input from the generator 3C
To store.

By continuing the above operation up to the maximum value of the distance data, the processing of 0 of the angle data is completed. By performing these processes up to the maximum value of the angle data, all the radar image data and its interpolation data are stored in the frame memory 4A,
You can write to 4B and 4C. Data mixer section 6
Selects the largest value of the radar image data stored in the frame memories 4A, 4B, 4C sequentially read from the upper left origin for display on the raster scanning display device and outputs the selected value. The data brightness conversion unit 10 converts the control signal input from the outside and the brightness data output from the data mixer unit 6 into brightness data selected by a predetermined conversion method and outputs the brightness data. The output signal conversion unit 7 sequentially reads the radar image data output from the data mixer unit 6 from the upper left origin and converts it into a display signal in order to display the radar image data on the display device.

Embodiment 5 In the synthesis of radar image data input from a plurality of systems in the second embodiment, in the case of the same coordinates, the maximum value of the input data is output or the added value is controlled to be output. The data output from the data mixer unit is added, the added value is divided by the number of data to obtain an average value, and the data output is equal to or higher than the average value obtained by the control signal.

FIG. 12 is a configuration diagram showing a fifth embodiment of the present invention. 1 to 4, 7, and 8 in the figure are the same as those in the second embodiment. Reference numeral 10 denotes a data brightness conversion unit that calculates an average value of data output from the data mixer unit 8 by a control signal input from the outside and converts the average value into new data.

The data / luminance converting section 10 includes a data mixer section 8
The data output from the above is added to calculate an average value, and the luminance of a value below the average is set as 0 data, and the data above the reading average value is transmitted as radar image data.

In the radar scanning converter constructed as described above, first, when the distance data 0, the angle data 0 and the radar image data thereof are input to each system at the timing synchronized with the rotation of the antenna, the coordinate converter 2A. , 2
B and 2C are distance data R according to "Equation 1" and "Equation 2",
The angle data B is converted into a rectangular coordinate address (X, Y). The interpolation address generators 3A, 3B, 3C sequentially output the interpolation addresses from the rectangular coordinate address (X, Y). At this time, the interpolation data generators 1A, 1B, 1C hold the radar image data, and the interpolation address generators 1A, 1B
It is output in synchronization with the output of the interpolation address from B and 1C. The frame memory 4A stores the radar image data Da that is synchronously input from the interpolation address generating unit 3A, and the frame memory 4B stores the radar image data Db that is synchronously input from the interpolation address generating unit 3B.
C stores the radar image data Dc that is synchronously input from the interpolation address generating unit 3C.

Next, when the distance data is updated and the distance data of 1, the angle data of 0 and the radar image data thereof are input, the coordinate conversion units 2A, 2B and 2C perform "numeral 1" and "numeral" similarly to the above. According to 2 ", the distance data R and the angle data B are converted into the rectangular coordinate address (X, Y). Interpolation address generators 3A, 3B and 3C are orthogonal coordinate addresses (X, Y)
To sequentially output interpolation addresses. At this time, the interpolation data generators 1A, 1B and 1C hold the radar image data and output it in synchronization with the output of the interpolation address from the interpolation address generators 1A, 1B and 1C. Frame memory 4
A is the radar image data Da that is synchronously input from the interpolation address generating unit 3A, the frame memory 4B is the radar image data Db that is synchronously input from the interpolation address generating unit 3B, and the frame memory 4C is the interpolation address. Radar image data Dc synchronously input from the generator 3C
To store.

By continuing the above operation to the maximum value of the distance data, the processing of 0 of the angle data is completed. By performing these processes up to the maximum value of the angle data, all the radar image data and its interpolation data are stored in the frame memory 4A,
You can write to 4B and 4C. Data mixer section 8
When a selection signal is input, is read out sequentially from the upper left origin for display on a raster scanning display device, selects the largest value of the radar image data stored in the frame memories 4A, 4B, 4C and outputs it. When the selection signal is not input, the values obtained by adding the radar image data stored in the frame memories 4A, 4B, and 4C are selected and output. The data brightness conversion unit 10 converts the control signal input from the outside and the brightness data output from the data mixer unit 8 into brightness data selected by a predetermined conversion method and outputs the brightness data. The display value conversion unit 7 sequentially reads the output value from the upper left origin to display the radar image data output from the data mixer unit 8 on the display device and converts it into a display signal.

[0071]

Since the present invention is constructed as described above, it has the following effects.

By selecting and outputting the largest value of the radar image data output from each frame memory, a plurality of radar image data can be displayed simultaneously.

Further, a plurality of radar image data can be displayed simultaneously by controlling the calculation method of the radar image data output from each frame memory by an external selection signal.

Further, by selecting the means for converting the data output from the data mixer in the data brightness converter by the selection signal from the outside, it is possible to perform radar display with improved visibility of the radar image. .

Further, by selecting the means for converting the data output from the data mixer section in the data brightness conversion section by the control signal from the outside, it is possible to perform radar display with improved visibility of the radar image. .

Further, by controlling the calculation method of the radar image data output from each frame memory by an external selection signal, a plurality of radar image data can be displayed at the same time, and the data brightness conversion unit can display the data in the data mixer unit. By selecting a means for converting the data output from the device by a control signal from the outside, it is possible to perform radar display with improved visibility of the radar image.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a data mixer section in the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a data mixer section in a second embodiment of the present invention.

FIG. 5 is a diagram showing radar image data according to the second embodiment of the present invention.

FIG. 6 is a configuration diagram showing a third embodiment of the present invention.

FIG. 7 is a configuration diagram showing a data luminance conversion unit according to a third embodiment of the present invention.

FIG. 8 is a diagram showing conversion data of a data brightness conversion unit according to the third embodiment of the present invention.

FIG. 9 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 10 is a configuration diagram showing a data luminance conversion unit in a fourth embodiment of the present invention.

FIG. 11 is a diagram showing conversion data of a data brightness conversion unit according to the fourth embodiment of the present invention.

FIG. 12 is a configuration diagram showing a fifth embodiment of the present invention.

FIG. 13 is a configuration diagram showing a conventional radar scan conversion device.

FIG. 14 is a diagram showing a relationship between polar coordinates and Cartesian coordinates.

FIG. 15 shows P when signals of conventional radar image data Da, distance data Ra, and angle data Ba are selected.
It is a figure which shows an example of PI display.

FIG. 16 is a P when signals of conventional radar image data Db, distance data Rb, and angle data Bb are selected.
It is a figure which shows an example of PI display.

FIG. 17 shows P when the signals of conventional radar image data Dc, distance data Rc, and angle data Bc are selected.
It is a figure which shows an example of PI display.

FIG. 18 is a P when signals of conventional radar image data Da, distance data Ra, and angle data Ba are selected.
It is a figure which shows an example of PI display.

[Explanation of symbols]

1A, 1B, 1C Interpolation data generator, 2A, 2B, 2
C coordinate conversion unit, 3A, 3B, 3C interpolation address generation unit, 4A, 4B, 4C interpolation address generation unit, 6 data mixer unit, 7 display signal conversion unit, 8 data mixer unit, 9 data brightness conversion unit, 10 data brightness Converter,
12 signal selection section, 13 comparator, 14 selector, 15 comparator, 16 selector, 17 adder, 18 selector, 19 address generator, 20 memory, 21 luminance data table, 22 luminance data table, 23 luminance data table, 24 luminance data Data curve of table 21, 25 luminance data table 2
2 data curve, 26 data curve of brightness data table 23, 27 switch, 28 adder, 29 comparator, 30 counter, 31 switch, 32 divider, 33 data generator, 34 radar image data, 3
5 Radar image data average value, 36 average value or less 0
Image data of 40, origin on display screen, 4
1 Origin of PPI display, 42 Radar image data, 43
A circle showing the outermost periphery of the PPI display, 44 radar image data Da, 45 radar image data Db, 46 radar image data Dc, 47 noise of radar image data, 48
Target of radar image data.

Claims (5)

[Claims] 1. A plurality of coordinate conversion units for converting polar coordinate data represented by distance data and angle data into Cartesian coordinate data, and a distance resolution when the coordinate-converted radar image data is stored in a frame memory. And a plurality of interpolation data generators for generating interpolation coordinate data on the Cartesian coordinates from the resolution on the Cartesian coordinates obtained from the angular resolution, and interpolation values of the radar image data to be stored in the address of the frame memory for the interpolation coordinate data A plurality of interpolation address generators for generating, a plurality of frame memories for storing the radar image data at an address corresponding to the coordinate-converted Cartesian coordinate data, and displaying the radar image data stored in the frame memory. In a radar scanning conversion device that includes a display signal conversion unit that reads out at a timing and converts it into a display signal When the data stored in the plurality of frame memories is read at the display timing, the read data is compared in size, and the largest data among the read data is selected and output. Scan conversion device. 2. When reading data stored in a plurality of frame memories at a display timing, means for comparing the sizes of read data and selecting and outputting the largest data, and the read data is the largest data. The radar scanning conversion apparatus according to claim 1, wherein the data mixer section is configured by means for adding to and outputting to. 3. The selection signal and the data output from the data mixer unit are converted into an address corresponding to the luminance data table, the data of the prepared pattern is stored in the specified address, and the data is output at the display timing. The radar scanning conversion device according to claim 1, wherein 4. The data output from the data mixer section is added, the added value is divided by the number of data output from the data mixer section to obtain an average value, and data above the calculated average value is displayed by a control signal. 2. The radar scanning conversion device according to claim 1, wherein the radar scanning conversion device outputs at the timing. 5. The data output from the data mixer unit is added, the added value is divided by the number of data output from the data mixer unit to obtain an average value, and data above the calculated average value is displayed by a control signal. 3. The radar scanning conversion device according to claim 2, wherein the radar scanning conversion device outputs at the timing of.