JPH0368886A - Radar scanning converting apparatus - Google Patents

Abstract

PURPOSE:To enhance display capacity to a large extent by converting a video signal to XY coordinates and writing video data and the XY coordinates in a buffer memory in the correspondence of 1 : 1. CONSTITUTION:The analogue video signal 50 from a radar receiver is converted to a digital video signal 54 in an A/D converting part 100 to be outputted to the input terminal of the FIFO 206 for a buffer memory. The XY coordinate data 59 from a multiplier 203 and the offset data 60 from a display controller 204 are added by an adder/display detector 205 and the XY coordinates 61 on a display surface is calculated with respect to the video signal. When this operation result is within a display range, a data effective flag 62 is outputted to an FIFO write controller 207. A write signal 63 is outputted to the FIFO 206 for the buffer memory in the FIFO write controller 207 to write the digital video signal 54 and the XY coordinates 61.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to PPI images (T,
The present invention relates to a scan conversion device 2 that converts images such as θ coordinates) and RHr images (r, h coordinates) to orthogonal coordinates (x, y).

[Conventional technology]

FIG. 2 is a block diagram showing the configuration of a conventional radar scan conversion device described in, for example, Japanese Patent Laid-Open No. 61-84573. In the figure, 100 is an A/ D conversion section, 10
1 is a panzer memory that stores digital video according to distance; 102 is an R1θ address generator that generates T and θ coordinates corresponding to the digital video; and 103 is X that converts polar coordinates indicated by direction and distance into rectangular coordinates. , a Y address generation unit; 104 is a video memory for storing the digital video from the buffer memory 101 as a digital video signal in orthogonal coordinates; 105 is a pixel omission memory for correcting pixel omission when converting from polar coordinates to orthogonal coordinates;
106 is a D/A converter that converts digital video from the video memory 104 into analog video, and 107 is a display device.

Next, the operation will be explained. An analog video signal 10 from the radar receiver is converted into a digital video signal 11 in an A/D converter 100 and input to a buffer memory 101. Also, the radar trigger signal 1 from the radar receiver
3. The north signal 14 and the angle signal 15 are input to the R1θ address generation section 102. R3θ3θ address part 1
02 stores the distance count pulse 16 in the buffer memory 10.
Send to 1. In the buffer memory 101, the digital video signal 11 is sequentially written while the memory address is incremented by the distance count pulse 16. Also R
The 1θ address generating section 102 also generates an azimuth signal 17 and a distance signal 17' at the same time, and outputs them to the X, Y address generating section 103.

To write the video data 12, an X, Y address generator 103 generates an X, Y coordinate address signal 19 based on the azimuth signal 17, and writes the video data 12 read from the buffer memory 101 to the video memory 104. After that, the buffer memory 101 prepares the next data in response to the count signal 18 from the X, Y address generator 103.

On the other hand, if the coordinates indicated by the X, Y coordinate address signal 19 from the X, Y address generation unit 103 are in the vicinity of the pixel omission, the memory 105 stores the pixel omission using the neighborhood signal 205.
is sent to the X, Y address generation section 103, and the X, Y address generation section 103 generates an address for pixel extraction, and by disabling the count signal 18 of the buffer memory 101, the video memory 104 generates an address at the neighboring coordinates. The digital video signal 12 is written as data corresponding to the pixel address.

When reading video data, X, Y address generation section 1
X, Y coordinate address signal 1 for TV reading from 03
9 are sequentially generated, video data corresponding to the addresses are sequentially read out from the video memory 104, and the D/A converter 10
After being converted into analog video in step 6, the radar video is displayed on a display device 107.

[Problems to be Solved by the Invention] Since the conventional radar scan conversion device is configured as described above, it is difficult to freely offset the center of the R2θ address with respect to the display center of the display device. When displaying only a portion of the radar video signal by enlarging or reducing it, there is a problem that it is difficult to display the details of the radar video according to the display resolution, and the buffer memory only contains video data for the R1θ coordinate. Therefore, if the relationship between writing and reading is broken due to a malfunction of the buffer memory, the read data and
There were problems such as the coordinate relationship with Y was continuously broken and it was difficult to correct it to a normal state.

This invention was made in order to solve the above-mentioned problems, and the center of the radar video can be freely offset from the center of the display of the display device, and when displaying a part of the radar video in enlargement or reduction. To obtain a radar scan conversion device capable of displaying details in accordance with display resolution, and in which the coordinates of read data do not malfunction continuously due to malfunctions when writing or reading memory data. With the goal.

[Means to solve the problem]

The radar scanning conversion device according to the present invention coordinately converts a video signal into X and Y coordinates, including an offset amount between the center of the video signal and the center of the display, and an enlargement/reduction ratio of the display length with respect to a unit distance of the video signal. After that, buffer memory
, and the Y coordinate.

[Effect]

The radar scan conversion device according to the present invention changes the resolution (sampling rate) in the distance direction of the radar video according to the enlargement/reduction of the display when converting a position signal (azimuth signal) for a radar video signal into an X, Y coordinate. X, Y is changed by adding the offset amount to the output data.
The display range of the display coordinates is determined, and only the video signal within the display range is extracted and written to the buffer memory along with the X and Y coordinates, so the center of the radar video can be freely aligned with the display center of the display device. The distance resolution of the radar video can be made optimal for the display resolution when enlarging/reducing a portion of the radar video.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 is a block diagram showing the configuration of a radar scan conversion device according to an embodiment of the present invention.
/D conversion unit, 200 is a SIN/CO3 converter that decomposes the azimuth signal from the radar into an X component and a Y component, 201 is a reference clock generator that generates a reference clock signal from manual data of the enlargement/reduction ratio, 202 is a range counter that counts the reference clock, and 203 is a SIN/
Output from CO3 converter 200 and range counter 20
205 is an adder and an out-of-display detector that adds the output from the multiplier 203 and the offset amount from the display controller 204 and determines whether the data is out-of-display, and 207 is a display. a FIFO write controller that controls writing valid video signals and X, Y coordinates within a range to the FIFO;
206 is a buffer memory that stores valid video data. FIFO 120B sends the address of the video memory 209 to the FIFO side when writing data from the FIFO 206, and from the display controller 204 when outputting a video signal to the D/A converter. Flip to raster/address side, address switcher, 209 is video memory, 210
204 is a display controller that controls the timing of the entire display device; 107 is a display device; 204 is a display controller that controls the timing of the entire display device;

Next, the operation will be explained. The analog video signal 50 from the radar receiver is converted into a digital video signal 54 in the A/D converter 100, and then sent to the FIF for buffer memory.
It is output to the input terminal of O206. The azimuth signal 51 from the radar receiver is input to the SlN/COS converter 200, converted into an X component (SINθ) and a Ytc component (COSθ), and input to a multiplier 203.

Further, the radar trigger signal 52 from the radar receiver and the enlargement/reduction ratio data 58 from the display controller 204 are input to the reference clock generator 201, and the distance resolution is adjusted such that the enlargement/reduction ratio corresponds to the display resolution. A reference clock 56 with repetition is provided for the range counter 202 . and output to the FIFO write controller 207.

The range counter 202 counts the reference clock 56 from the range 0 signal input via the reference clock generator 201 and outputs it to the multiplier 203 as a parallel counter output 57.
Then, for the X side, multiply by s■Nθ, and for the Y side, multiply by Cos
The result of this multiplication (that is, the X and Y coordinate data of the unoffset video) is output to the adder and out-of-display detector 205.

The adder and off-display detector 205 adds (or subtracts) the X, Y coordinate data 59 from the multiplier 203 and the offset data 60 from the display controller 204, and adds (or subtracts) the X, Y coordinate data 59 from the multiplier 203 to the offset data 60 from the display controller 204, X, Y coordinates of 6
1 is required. If the calculated result is within the display range, a data valid flag 62 is output to the FTFO write controller 207. In the FIFO write controller 207, the adder and off-display detector 205
While the data valid flag 62 from the reference clock generator 201 indicates valid, the reference clock 5 from the reference clock generator 201
FIFO 206 for buffer memory in synchronization with 6.
Outputs the FO write signal 63 and outputs the digital video signal 5.
4. Write X, Yil161.

On the other hand, when the video memory 209 is enabled for writing outside the video display time, the display controller 204 outputs the FXFO read signal 65 to the buffer memory FIF○2゜6, and at the same time outputs the FXFO read signal 65 to the address switch 208 for video memory access. A switching signal 73 is output so that the memory address 69 for the buffer memory PIF 206 can be input manually.

In the video memory 209, FIFO for buffer memory
The memory address 69 for the video signal is X from the FIFO 206 for buffer memory.

Y coordinate 67 is input via address switch 208.

The video signal 6 thus input to the video memory 209
6 is written to the memory address 69 specified by the write signal 74 from the display controller 204.

D/A change tA of the video signal written in this way
The output to the display controller 210 is
The address switch 208 is switched so that the raster address 68 from 4 becomes the address 69 of the video memory 209.

This raster address 68 is output to the video memory 209 while being incremented according to the raster.

In this way, the digital video signal 70 output from the video memory 209 is converted into analog video by the D/A converter 210, and then the output is displayed on the display device 107.

In this way, in this embodiment, the video signal is
After coordinate conversion to the Y coordinate, the video data and the X and Y coordinates are written in a one-to-one correspondence to the buffer memory, so the center of the radar video can be freely offset from the display center of the display device. At the same time, when enlarging or reducing a portion of the radar video, it is possible to optimize the distance resolution of the radar video for the display resolution, which greatly improves display performance and saves memory. It is possible to realize a system that is highly repairable against malfunctions.

〔Effect of the invention〕

As described above, according to the present invention, the video signal is converted to After coordinate conversion, the video data and X, Y coordinates are written in a one-to-one correspondence to the buffer memory, so the center of the radar video can be offset freely with respect to the display center of the display device, and the radar video For enlargement/reduction display of a portion of , the distance resolution of the radar video becomes optimal for the display resolution, and there is an effect that an inexpensive device and a radar scan conversion device with high display accuracy can be obtained in terms of display performance.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a radar scan conversion device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional radar scan conversion device. 100... A/D conversion section, 101... Buffer memory, 102... R9θ address generation section, 103...
X. Y address generation unit, 104... video memory, 105
... Pixel wave is memory, 106... D/A converter, 1
07... Display device, 200... SIN/CO3 converter, 201... Reference clock generator, 202
... Range counter, 203 ... Multiplier, 204.
...Display controller, 205...Adder and non-display detector, 206...F for buffer memory
IFO1207...FIFO light controller,
208... Address switcher, 209... Video memory, 210... D/A converter. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In a radar scan conversion device that converts a video signal in an arbitrary scan into rectangular coordinates (x, y), means for converting an azimuth signal corresponding to the video signal into an X component and a Y component; , multiplying the Y component by data related to the display enlargement amount,
means for obtaining X, Y coordinate data; means for adding data regarding the offset position of the scanning origin to the X, Y coordinate data; and X, Y coordinates output by the adding means for the required display rectangular coordinate range One-on-one data with video data
A radar scan conversion device comprising: means for storing data.