JPH11101869A - Radar scan transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the transmitting capacity of a radar scan transmitter without deteriorating the quality of video pictures. SOLUTION: A scan converter 14 inputs radar video signals 16 and outputs radar video data 25. A radar display device 11 displays the data 25 and graphic data in a superimposing state. A TV timing generator 13 generates timing signals 26 and a coordinate transformer 1 performs coordinate transformation. Frame memories 2 and 4 store data and a data comparator 7 compares radar video data 18 and 21 with each other and outputs a compared output signal 22. An encoder 8 encodes the output signal 22 of the comparator 7 and outputs encoded data 23 and a transmission memory 9 stores the data 23. A transmitting timing generator 10 outputs a reading-out timing signal 24 and a D/A converter 5 converts the radar video data 18 into analog video data 19. A TV monitor 6 for maintenance monitors radar videos.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radar scanning transmission apparatus, and more particularly to a radar scanning transmission apparatus for transmitting a radar video signal to a separated radar display apparatus.

[0002]

2. Description of the Related Art Conventionally, this kind of radar scanning transmission apparatus performs scan conversion processing of a radar video signal sent from a radar apparatus, and stores all frame memory data corresponding to display pixels of a TV monitor on a one-to-one basis. It is transmitted together with the monitor synchronization signal.

FIG. 5 is a block diagram showing a conventional radar scanning transmission apparatus.

A conventional radar scanning transmission apparatus receives a radar video signal 16 and outputs radar video data 18 obtained by processing the radar video signal 16. The radar scanning conversion apparatus 15 outputs the radar video data 18 and outputs the radar video data 18 internally. And a radar display device 11 for performing processing of superimposing the generated graphic data on the display.

[0005] The radar scan converter 15 includes a TV timing generator 3 for generating various timing signals 20, a coordinate converter 1 for converting the radar video signal 16 from polar coordinates of Rθ to rectangular coordinates of X and Y, and X , Y coordinate, and the converted video data 17 corresponding to the display pixels of the TV monitor in a one-to-one correspondence with the timing signal 20, and the radar video data 18 read from the frame memory as the analog video data 19. D / A converter 5 for conversion and analog video data 19
, And a maintenance TV monitor 6 for displaying a radar image on a monitor.

Next, the operation will be described with reference to FIG.

[0007] A polar coordinate system radar video signal 16 sent from a radar device (not shown) is input to a coordinate converter 1, where the coordinate conversion from the polar coordinate of Rθ to the rectangular coordinate of X and Y, the offset, Processing such as range scale and gain adjustment is performed, and converted video data 17 converted into X, Y addresses and luminance data corresponding to display pixels of the TV monitor on a one-to-one basis is output to the frame memory 2. The frame memory 2 stores the converted video data 17. TV
The timing generator 3 generates various timing signals 20 according to the synchronization signal of the TV monitor. The converted video data 17 stored in the frame memory 2 is read out using a timing signal 20 for TV scanning timing, and is combined with the timing signal 20 for a synchronizing signal to produce the radar video data 18.
To the radar display device 11 and to the D / A converter 5 together with the D / A conversion timing signal 20.

[0008] The radar video data 18 output to the D / A converter 5 is converted into analog video data 19 suitable for the input interface of the maintenance TV monitor 6.
It is displayed on the maintenance TV monitor 6.

The radar display device 11 performs processing such as superposition on the radar video data 18 from the radar scan conversion device 15 and graphic data generated in its own system and displays the data.

In recent years, when transmitting radar video data, a method of transmitting data after performing data compression to reduce the amount of data has been used.

As an example of such data compression transmission,
Japanese Patent Application Laid-Open No. 61-271480 discloses a "radar signal band compression apparatus".

This publication describes a technique for compressing video data by averaging data of several sweeps of radar and transmitting the averaged data.

[0013]

The conventional radar scanning transmission apparatus described above has a drawback that the transmission capacity becomes enormous because all the frame memory data which is not updated within the scanning period is transmitted each time.

For example, the transmission capacity in the case of a non-interlace system in which the luminance of one pixel of radar video data is 8 bits, the resolution is 1024 × 1024, and the vertical frequency is 60 Hz is 1024 Mbps × 8 × 60 = 503 Mbps. Requires a TV monitor retrace time, which further increases the transmission capacity.

[0015] Further, since the data is transmitted in a compressed form, there is a disadvantage that the apparatus on the transmitting and receiving sides is complicated.

An object of the present invention is to provide a radar scanning transmission apparatus that reduces transmission capacity without deteriorating video quality.

[0017]

SUMMARY OF THE INVENTION A radar scanning transmission apparatus according to the present invention receives and processes a radar signal from a radar apparatus, and transmits the radar signal to a remote radar display apparatus. First and second every
Are sequentially stored in the storage means, the respective radar data read from these storage means are compared, and the radar data of the updated changed portion and the corresponding storage address are extracted in the order of scanning, and the data and the address are extracted. Is encoded and transmitted to the radar display device.

In a radar scanning transmission apparatus for receiving and processing a radar signal from a radar apparatus and transmitting it to a remote radar display apparatus, the radar signal in polar coordinate system is converted into radar video data in rectangular coordinate system and output. A first image memory for storing the radar video data; a second image memory for storing radar video data read from the first image memory; a first image and a second image The respective radar video data read from the memory are compared, and updated radar video data indicating a changed portion and an address corresponding thereto are
A data comparator for outputting as radar difference data; an encoder for encoding the radar difference data and outputting encoded data; storing the encoded data, reading it out with a transmission timing signal, and reading the radar as a radar video signal A transmission memory for transmitting to a display device; a transmission timing generator for outputting the transmission timing signal;
A D / A converter for converting the radar video data read from the image memory of FIG.
A television monitor for monitoring the analog video data output from the / A converter; and a timing generator for supplying various timing signals.

Further, in a radar scanning transmission device for receiving and processing a radar signal from a radar device and transmitting it to a remote radar display device, the radar signal in polar coordinate system is converted into radar video data in rectangular coordinate system. A first image memory for storing the radar video data; a second image memory for storing the radar video data read from the first image memory;
A data comparator that compares each of the radar video data read from the first and second image memories and outputs updated radar video data indicating a changed portion and an address corresponding thereto as radar difference data;
An encoder that encodes the radar difference data and outputs encoded data; a transmission memory that stores the encoded data, reads out the data by a transmission timing signal, and transmits the data as a radar video signal to the radar display device; A transmission timing generator for outputting a timing signal; a display device for monitoring radar video data read from the first image memory; and a timing generator for supplying various timing signals.

[0020] The display device is a liquid crystal display.

It is characterized in that the timing generator and the transmission timing generator are integrated.

[0022]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of a radar scanning transmission apparatus according to the present invention.

In this embodiment shown in FIG. 1, a scan converter 14 which receives a radar video signal 16 and outputs radar video data 25 obtained by processing the radar video signal 16, a radar video data 25 and a graphic signal generated inside its own system. And a radar display device 11 for performing a process of superimposing data and displaying the data.

The scan converter 14 includes a TV timing generator 13 for generating various timing signals 26, a coordinate converter 1 for converting the radar video signal 16 from polar coordinates of Rθ to rectangular coordinates of X and Y, and X, Frame memory 2 for writing converted video data 17 converted to Y coordinates and corresponding to display pixels of the TV monitor on a one-to-one basis by timing signal 26, and radar video data 18 read from frame memory 2 by timing signal 26 The frame memory 4 is compared with the radar video data 18 read from the frame memory 2 and the radar video data 21 read from the frame memory 4. If the data is different, the X and Y addresses and the corresponding data are compared with the data comparison output signal 22. Data comparator 7 which outputs as The encoder 8 which outputs a force signal 22 as encoded data 23 by encoding the encoded data 2
And a transmission timing generator 1 that outputs a read timing signal 24 for the transmission memory 9.
0 and D / A for converting the radar video data 18 read from the frame memory 2 into analog video data 19
It has a converter 5 and a maintenance TV monitor 6 that receives analog video data 19 and displays a radar image on a monitor.

Next, the operation of the present embodiment will be described in more detail with reference to FIG.

A radar video signal 16 in a polar coordinate system from a radar device (not shown) is input to a coordinate converter 1 where X, Y coordinate conversion, offset, range scale, gain adjustment, etc. are performed. X and Y addresses and luminance data corresponding to the display pixels of the TV monitor on a one-to-one basis are generated and written to the frame memory 2. The TV timing generator 13 generates various timing signals 26 according to the synchronization signal of the TV monitor, reads out the data stored in the frame memory 2 with the timing signal 26 of the TV scanning timing, and writes the data into the frame memory 4 at the next stage. At the same time, the radar video data 18 read from the frame memory 2 is sent to the D / A converter 5 and converted into analog video data 19 suitable for the input interface of the TV monitor 6 for maintenance. Is displayed.

Therefore, the data stored in the frame memory 4 is the data one cycle before the TV cycle with respect to the data stored in the frame memory 2. The data comparator 7 compares the radar video data 18 and the radar video data 21 simultaneously read from the frame memories 2 and 4 at the timing of each TV scanning address from the TV timing generator 13, and the radar video data is updated. The X and Y addresses of the location where the error occurred are detected. Thus, the difference radar video data updated during one TV cycle time can be extracted as the data comparison output signal 22 together with the X and Y addresses in the order of TV scanning.

FIG. 2 is an explanatory diagram showing the update of radar video data.

Referring to FIG. 2, it can be seen that, from the radar video data 18 stored in the frame memory 2 and the radar video data 21 stored in the frame memory 4, differential radar video data updated as a change is obtained. .

The updated data detected by the data comparator 7 is output to the encoder 8 together with the X and Y addresses as a data comparison output signal 22. In this case, the data amount of the radar update data detected by the data comparator 7 is very small. For example, in the case of an ARSR radar, the rotation of the radar is 1
The period is about 10 seconds. Also, set the resolution of the TV monitor to 1
024 pixels × 1024 pixels, the scanning cycle is 60 Hz (1
6.7 ms) Assuming that the luminance of one pixel is 8 bits, the frame memory capacity is 1024 × 1024 × 8 = 8 Mbi
t.

When the amount of data to be updated is roughly estimated, the angle of rotation of the radar during one scanning cycle of the TV monitor is 16.7 ms: 10 s: 360 degrees = 16.7 ms: x
Thus, x = 0.5 degrees is obtained, and the data amount is 102
Since 4 × sin (0.5) = 9 dots, 9 × 10
The data amount is about 24 × 8 = 72 kbit.

The encoder 8 encodes the updated data and its X and Y addresses and stores the encoded data as encoded data 23 in the transmission memory 9 once. The encoded data 23 stored in the transmission memory 9 is separated from the radar display device 1 in accordance with the readout timing of the transmission timing generator 10.
1 is output as radar video data 25. The radar display device 11 decodes the encoded radar video data 25 from the scan conversion device 14, performs processing such as superimposition with graphic data generated internally, and displays the processed data. Note that there are various methods for encoding the transmission data by the encoder 8, but the simplest example is a method of transmitting the start address of the updated portion and its data string. The update address continuously increases because an update portion is detected in the order of TV scanning. Therefore, it is not necessary to transmit the X and Y addresses together with the data every time, and the data of the address may be added and transmitted only when there is no continuity with the address of the previous data.

As a method for adding this address, the following 3
There are two ways.

The first case is when the X and Y addresses are both transmitted. The second is not sending the address,
With the Y address fixed on the radar display device 11, only the X address is incremented by one. this is,
This is a case where adjacent data is transmitted in the same column (same Y address) as the immediately preceding transmission data address. The third is X
Only the address is transmitted, and the Y address is
One side increases 1 count. This is a case where arbitrary X address data in the next row (next Y address) of the previous transmission address is transmitted. Therefore, whether or not an address is added can be identified by 2-bit data.

FIG. 3 is a diagram for explaining an example of transmission data coding. FIG. 3A shows a one-screen configuration diagram of the radar video data, and FIG. 3B shows a transmission format.

A case will be described in which the TV resolution is 1024 pixels × 1024 pixels and the luminance data of each pixel is 8 bits. When the nine data indicated by numerals in FIG. 3A are encoded and transmitted as changed update data, the following operation is performed.

Since the update data is detected at the timing of the TV scanning, the order of detection depends on the TV scanning order, but is detected first, and then the following order. For this reason, when transmitting data, two bits indicating whether or not to transmit an address are set to “X address (10 bits)” and “Y address (10 bits)” in “transmission of address” in the transmission format.
bit) is set, and data (8 bits) subsequent to the X and Y addresses is transmitted. Next, a case of transmitting data will be described. The Y address of the data is the next to the Y address of the previously transmitted data. In this case, the bit of "presence / absence of address transmission" is set to "X address present / Y address not present", the Y address is not transmitted, and only the data (8 bits) with the X address (10 bits) is transmitted.

Next, data transmission will be described.
The address is an address next to the previously transmitted data in the X direction. In this case, the bit of "address transmission presence / absence" is set to "no X, Y address", and data (8 bits) without transmitting the X, Y address is transmitted. After that, similarly, set the "address transmission presence / absence" bit based on the relationship with the previous transmission address, and add the address as necessary.
Send the data.

FIG. 4 is a block diagram showing a second embodiment of the present invention.

Referring to FIG. 4, the radar video signal 16
And a radar conversion device 27 for outputting radar video data 25 obtained by processing the data, and a radar display device 11 for performing processing of superimposing the radar video data 25 and graphic data generated in the own system and displaying the result. Have been.

In FIG. 4, components corresponding to those shown in FIG. 1 are denoted by the same reference numerals or symbols, and description thereof is omitted.

The difference from FIG. 1 is that a maintenance display device 12 is provided in place of the maintenance TV monitor 6 and the D / A converter 5 is omitted. This is because a liquid crystal display or an EL display that does not require D / A conversion is used as a display device.

Even in the case of the configuration shown in FIG.
Since the amount of data to be transmitted to one is small and the transmission data address changes continuously, the functions and performances of encoding are easy and the transmission capacity is small are the same.

As described above, of the scan-converted radar video data, only the portion updated for each TV scan is represented by T
Since the data is extracted in the order of V scanning, encoded, and transmitted to the radar display device, the transmission amount of video data can be reduced and transmitted to the radar display device without deteriorating the video quality. Since the data transmission amount is small, the number of connection cables between the radar scan conversion devices 14 and 27 and the radar display device 11 can be reduced.

Note that a circuit configuration in which the TV timing generator 13 and the transmission timing generator 10 are integrated is also possible.

[0047]

As described above, the radar scanning transmission apparatus of the present invention extracts and transmits only video data updated in units of a scanning cycle, so that the transmission capacity can be reduced with a simple configuration. have.

Further, since the transmission capacity is small, the number of transmission cables can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a radar scanning transmission apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing updating of radar video data.

FIG. 3 is a diagram illustrating an example of transmission data encoding.

FIG. 4 is a block diagram showing a second embodiment of the present invention.

FIG. 5 is a block diagram showing a conventional radar scanning transmission device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coordinate converter 2 Frame memory 3 TV timing generator 4 Frame memory 5 D / A converter 6 TV monitor for maintenance 7 Data comparator 8 Encoder 9 Transmission memory 10 Transmission timing generator 11 Radar display device 12 Maintenance display Device 13 TV timing generator 14 Scan converter 17 Converted video data 18 Radar video data 19 Analog video data 20 Timing signal 21 Radar video data 22 Data comparison output signal 23 Encoded data 24 Read timing signal 25 Radar video data 26 Timing signal 27 Scan converter

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09G 5/00 520 G09G 5/00 520V 555 555A

Claims (5)

[Claims] 1. A radar scanning transmission device for receiving a radar signal from a radar device and transmitting it to a remote radar display device, wherein said radar signal is sequentially stored in first and second storage means for each scan. Then, each radar data read from these storage means is compared, the radar data of the updated changed portion and the corresponding storage address are extracted in the order of scanning, and these data and addresses are encoded, A radar scanning transmission device for transmitting to a radar display device. 2. A radar scanning transmission device for receiving a radar signal from a radar device and transmitting it to a remote radar display device, wherein the radar signal in polar coordinate system is converted into radar video data in rectangular coordinate system. A first image memory for storing the radar video data; a second image memory for storing the radar video data read out from the first image memory; A data comparator for comparing each radar video data read from the image memory of the first embodiment and outputting updated radar video data indicating a changed portion and an address corresponding thereto as radar difference data; An encoder for encoding and outputting encoded data; storing the encoded data and reading the encoded data with a transmission timing signal. A transmission memory for transmitting a radar video signal to the radar display device; a transmission timing generator for outputting the transmission timing signal; and converting the radar video data read from the first image memory to analog video data. A radar scanning transmission device comprising: a D / A converter; a television monitor for monitoring the analog video data output by the D / A converter; and a timing generator for supplying various timing signals. . 3. A radar scanning transmission device for receiving a radar signal from a radar device and transmitting the received signal to a remote radar display device, wherein the radar signal in polar coordinate system is converted into radar video data in rectangular coordinate system. A first image memory for storing the radar video data; a second image memory for storing the radar video data read out from the first image memory; A data comparator for comparing each radar video data read from the image memory of the first embodiment and outputting updated radar video data indicating a changed portion and an address corresponding thereto as radar difference data; An encoder for encoding and outputting encoded data; storing the encoded data and reading the encoded data with a transmission timing signal. A transmission memory for transmitting a radar video signal to the radar display device; a transmission timing generator for outputting the transmission timing signal; a display device for monitoring radar video data read from the first image memory; A radar generator for supplying a timing signal. 4. The radar scanning transmission device according to claim 3, wherein said display device is a liquid crystal display. 5. The radar scanning transmission device according to claim 2, wherein said timing generator and said transmission timing generator are integrated.