JPS6184573A - Radar scanning conversion system - Google Patents
Radar scanning conversion systemInfo
- Publication number
- JPS6184573A JPS6184573A JP20775784A JP20775784A JPS6184573A JP S6184573 A JPS6184573 A JP S6184573A JP 20775784 A JP20775784 A JP 20775784A JP 20775784 A JP20775784 A JP 20775784A JP S6184573 A JPS6184573 A JP S6184573A
- Authority
- JP
- Japan
- Prior art keywords
- address
- signal
- memory
- conversion
- orthogonal coordinate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/295—Means for transforming co-ordinates or for evaluating data, e.g. using computers
- G01S7/298—Scan converters
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
(埋業上の利用分野)
本発明は、レーダ装置における映像のPPI (Pla
n Po5ition Indication )走査
方式全テレビ型の走査方式に変換するに当って発生する
画素の変換空隙による画質劣化の改善方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION (Field of industrial application) The present invention provides PPI (Pla...
nPo5ition Indication) Scanning Method This relates to a method for improving image quality deterioration due to pixel conversion gaps that occur when converting to a scanning method for all television types.
(従来技術と問題点)
従来、レーダ映像を明るい場所において観測可能とする
ブライトディスプレイ装置においてはテレビ型のブラウ
ン管が使用されるため、走査方式をレーダ装置のPPI
走査からテレビ型の水平垂直走査(TV走査)に変換し
ている。(Prior art and problems) Conventionally, a television-type cathode ray tube is used in a bright display device that allows radar images to be observed in a bright place.
Scanning is converted into television-type horizontal and vertical scanning (TV scanning).
即ち、成る位置が方位(θ)と距離(6)で表わされる
極座標(Rθ座標)形式から水平軸上の距離(3)と垂
直軸上の距離(7)で表わされる直交座標(XY座標)
形式に変換されている。That is, from polar coordinates (Rθ coordinates) where the position is expressed by the direction (θ) and distance (6), to rectangular coordinates (XY coordinates) where the position is expressed by the distance on the horizontal axis (3) and the distance on the vertical axis (7).
format has been converted.
ところで、レーダ映像面はその座標に応じた多数の画素
から構成されているために、PPI表示の極座標系から
TV走査の直交座標系への変換処理において書き込み画
素の抜け(変換空隙〕による画質劣化が生ずる欠点があ
った。By the way, since the radar image plane is composed of a large number of pixels according to their coordinates, the image quality deteriorates due to missing writing pixels (conversion gaps) during the conversion process from the polar coordinate system of PPI display to the orthogonal coordinate system of TV scanning. There was a drawback that this occurred.
一般に極座標表示を直交座標表示に変換する場合、第2
図に示すように黒丸で示される極座標の画素値から白丸
で示される直交座標の画素値への変換が必要となる。Generally, when converting polar coordinate display to rectangular coordinate display, the second
As shown in the figure, it is necessary to convert pixel values in polar coordinates, indicated by black circles, to pixel values in orthogonal coordinates, indicated by white circles.
この場合、極座標系での走査線数と直交座標系での画素
の大きさとの関係から原点に比較的近い部分では第3図
の様に訂座標での1画素分に対して複数個のRθ座標の
値が対応し、原点から比較的離れた場所では第4図の様
K XY座標での1画素にRθ座標の画素が対応できず
第4図1に示す画素抜け(変換空隙)となる場合が生ず
る。In this case, due to the relationship between the number of scanning lines in the polar coordinate system and the pixel size in the orthogonal coordinate system, in a portion relatively close to the origin, as shown in Figure 3, multiple Rθ The values of the coordinates correspond, and in a place relatively far from the origin, a pixel at the Rθ coordinate cannot correspond to one pixel at the K A situation arises.
画素抜けは、原点から遠い領域で特に垂直軸に対する角
度が晋+ 8 n (n =011.2.3)の方向で
特に多く発生しCRT画面上ではレーダ画像(ターゲッ
ト又はクラッタ)中に穴の様になって表われる。直交座
標では画素の形が四角いため視覚的にこれが強調される
ことがあり、画質を劣化させてい友。Pixel dropouts occur particularly frequently in areas far from the origin, especially in the direction where the angle to the vertical axis is +8n (n = 011.2.3), and on a CRT screen, holes appear in the radar image (target or clutter). It appears like this. In Cartesian coordinates, since the pixel shape is square, this may be visually emphasized, which degrades the image quality.
上記欠点金補うためθ方向の分解能を向上し解決する方
法も考えられるがビデオデータの書き込み時間等により
処理の高速化が必要となる為困難である。A method of improving the resolution in the θ direction may be considered to compensate for the above disadvantages, but this is difficult because it requires faster processing due to the time taken to write video data.
(問題点全解決する之めの手段)
本発明は上記欠点を除去し画素抜けによるレーダ映像面
の表示画質劣化を解決しtレーダ走査変換方法を提供し
ようとするものである。(Means for Solving All Problems) The present invention aims to eliminate the above-mentioned drawbacks, solve the deterioration in display quality of the radar image plane due to missing pixels, and provide a t-radar scan conversion method.
本発明は極座標系から直交座標系への変換においてR1
θの分解値及びX、Yの分解値から変換空隙座標が一意
的〈決定されることからその変換空隙座標をメモリに記
憶しておき、その座標に最も近い座標にビデオデータを
書き込む場合には変換空隙座標にも同じビデオデータを
書き込む様に構成される。The present invention provides R1 in the conversion from a polar coordinate system to a rectangular coordinate system.
Since the transformed void coordinates are uniquely determined from the decomposed values of θ and the decomposed values of The same video data is also written to the transformed void coordinates.
即ち、本発明は次のような構成を有する。That is, the present invention has the following configuration.
PPI走査によるアナログレーダビデオ信号をディジタ
ルビデオ信号に変換し、方位距離アドレス発生部からの
距離信号に基ついて前記ティシタルビチオ信号を各距離
単位に対応する記憶素子列を有するバッファメモリに記
憶させ、前記方位距離アドレス発生部からの方位信号お
よび距離信号に基ついて当該方位および距離で示される
極座標上の位置を直交座標上のアドレス表示に変換する
直交座標アドレス発生部を設け、該直交座標アドレス発
生部の発生する直交座標アドレス信号に基づいて、前記
バッファメモリ上のディジタル信号を直交座標アドレス
を有するビデオメモリに記憶させるレーダ走査変換方式
において、極座標から直交座標への変換時に生ずる変換
空隙の直交座標アドレスを記憶させておく記憶回路と、
前記直交座標アドレス発生部が出力している直交座標ア
ドレス信号が前記変換空隙アドレスの近傍であるか否か
を判断する画素抜はメモリとを設け、該画素抜はメモリ
が変換空隙アドレスの近傍のアドレスであると判断した
場合には次のステップで前記直交座標アドレス発生部に
対し、前記変換空隙の直交座標アドレス信号を出力する
よう指示する信号を送出させると共に、前記バッファメ
モリに対しては続いて同一の読み出しアドレスを指示す
るレーダ走査変換方式である。The analog radar video signal obtained by PPI scanning is converted into a digital video signal, and based on the distance signal from the azimuth/distance address generation section, the lateral signal is stored in a buffer memory having a storage element array corresponding to each distance unit, and the azimuth A rectangular coordinate address generator is provided which converts a position on polar coordinates indicated by the orientation and distance to an address display on rectangular coordinates based on the azimuth signal and distance signal from the distance address generator. In a radar scan conversion method in which digital signals on the buffer memory are stored in a video memory having orthogonal coordinate addresses based on a generated orthogonal coordinate address signal, the orthogonal coordinate address of a conversion gap that occurs when converting from polar coordinates to orthogonal coordinates is determined. A memory circuit that stores information,
A pixel extractor for determining whether or not the orthogonal coordinate address signal outputted by the orthogonal coordinate address generator is in the vicinity of the conversion gap address is provided with a memory; If it is determined that it is an address, the next step is to send a signal to the orthogonal coordinate address generator to instruct it to output the orthogonal coordinate address signal of the conversion gap, and to continue This is a radar scan conversion method that specifies the same read address.
(実施例) 以下本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.
第1図は本発明方法を行うための各手段の構成例を示す
ブロック図である。FIG. 1 is a block diagram showing an example of the configuration of each means for carrying out the method of the present invention.
レーダ受信機からのアナログレーダビデオ信号10はA
/p変換部100においてディジタルピデオ信号に変換
されその出力ディジタルビデオ信号11はバッファメモ
リ101に一時記憶される。又レーダ受信機からのレー
ダトリガ信号13、ノース信号14及び角度信号15は
方位距離アドレス発生部(以下Rθアドレス発発生色い
う〕102 K入力される。The analog radar video signal 10 from the radar receiver is A
The output digital video signal 11 is converted into a digital video signal by the /p conversion section 100 and is temporarily stored in the buffer memory 101. Further, a radar trigger signal 13, a north signal 14 and an angle signal 15 from the radar receiver are inputted to an azimuth/distance address generator (hereinafter referred to as an Rθ address generator) 102K.
Rθアドレス発生部102は距離カウントパルス16を
バッファメモリ101に送シディジタルビデオ信号11
の取り込みに用いる。又アジマス信号17および距離信
号17′も同時に発生し直交座標アドレス発生部(以下
XYアドレス発生部という)103に送る。The Rθ address generator 102 sends the distance count pulse 16 to the buffer memory 101 and receives the digital video signal 11.
Used for the uptake of An azimuth signal 17 and a distance signal 17' are also generated simultaneously and sent to a rectangular coordinate address generation section (hereinafter referred to as an XY address generation section) 103.
ビデオデータの書き込みの場合には、XYアドレス発生
部103においてはアジマス信号17を基にXY座標ア
ドレス信号19を発生しビデオメモリ104と画素抜は
メモリ105に送る。これによシバラフアメモリ101
からのディジタルビデオ信号12はビデオメモリ104
に書き込まれる。啓き込みが終了するとバッファメモI
J 101はXYアドレス発生部103からのカウント
信号186よシ次のデータを準備する。画素抜はメモリ
105はXYアドレス発生部103からのXY座標アド
レス信号19より現在書き込んでいる座標が画素抜けの
近傍かどうか比較する。もし現在書き込んでいる座標が
画素抜は券券の近傍の座標であれば、画素抜は近傍信号
20をXYアドレス発生部103に送り、XYアドレス
発生部103では画素抜はアドレスを発生しビデオメモ
リ104にカウント信号18のカウントを停止させるこ
とにより前記近傍の座標におけると同じディジタルビデ
オ信号12を書き込む。In the case of writing video data, the XY address generation section 103 generates an XY coordinate address signal 19 based on the azimuth signal 17 and sends it to the video memory 104 and pixel memory 105. This is Shibara Hua Memory 101
The digital video signal 12 from the video memory 104
will be written to. When enlightenment is finished, buffer memo I
J 101 prepares the next data based on the count signal 186 from the XY address generator 103. When a pixel is missing, the memory 105 compares the XY coordinate address signal 19 from the XY address generating section 103 to see if the coordinates currently being written are in the vicinity of the pixel missing. If the coordinates currently being written are coordinates near the pixel ticket, the pixel skip sends the neighborhood signal 20 to the XY address generator 103, and the XY address generator 103 generates the pixel address and sends it to the video memory. By stopping the count signal 18 at 104, the same digital video signal 12 as at the neighboring coordinates is written.
ビデオデータの読み出しの場合には、XYアドレス発生
部103はテレビ読み出し用のXY座標アドレス信号1
9も発生しビデオメモリ104に送る。D/A変換部1
06はビデオ読み出しデータ21からアナログ変換され
、TVビデオデータ22を表示装置107に送り表示装
置にレーダビデオを映し出す。In the case of reading video data, the XY address generation unit 103 generates an XY coordinate address signal 1 for reading television.
9 is also generated and sent to the video memory 104. D/A converter 1
06 undergoes analog conversion from the video read data 21, sends the TV video data 22 to the display device 107, and displays the radar video on the display device.
(発明の効果)
以上説明したように、本発明は画素抜けを生ずる肩アド
レスを記憶させておき、成る時点でバッファメモリから
のディジタルビデオ信号をビデオメモリに書き込んでい
る座標が画素抜はアドレスの近傍である場合にはその画
素抜はアドレスにも同じディジタルビデオ信号を書き込
む構成となっているので画素抜けが生ぜず画質劣化のな
いレーダ表示を提供する効果を有す′ る。(Effects of the Invention) As explained above, in the present invention, the shoulder address that causes pixel omission is stored, and at the point when the coordinates at which the digital video signal from the buffer memory is written to the video memory are the address of the pixel omission. If the pixel is in the vicinity, the same digital video signal is also written to the address when the pixel is omitted, so there is no pixel omission and there is an effect of providing a radar display without image quality deterioration.
Claims (1)
ルビデオ信号に変換し、方位距離アドレス発生部からの
距離信号に基づいて前記ディジタルビデオ信号を各距離
単位に対応する記憶素子列を有するバッファメモリに記
憶させ、前記方位距離アドレス発生部からの方位信号お
よび距離信号に基づいて当該方位および距離で示される
極座標上の位置を直交座標上のアドレス表示に変換する
直交座標アドレス発生部を設け、該直交座標アドレス発
生部の発生する直交座標アドレス信号に基づいて、前記
バッファメモリ上のディジタル信号を直交座標アドレス
を有するビデオメモリに記憶させるレーダ走査変換方式
において、極座標から直交座標への変換時に生ずる変換
空隙の直交座標アドレスを記憶させておく記憶回路と、
前記直交座標アドレス発生部が出力している直交座標ア
ドレス信号が前記変換空隙アドレスの近傍であるか否か
を判断する画素抜けメモリとを設け、該画素抜けメモリ
が変換空隙アドレスの近傍のアドレスであると判断した
場合には次のステップで前記直交座標アドレス発生部に
対し、前記変換空隙の直交座標アドレス信号を出力する
よう指示する信号を送出させると共に、前記バッファメ
モリに対しては続いて同一の読み出しアドレスを指示す
ることを特徴とするレーダ走査変換方式。Converting an analog radar video signal by PPI scanning into a digital video signal, storing the digital video signal in a buffer memory having a storage element column corresponding to each distance unit based on a distance signal from an azimuth and distance address generation section, and A rectangular coordinate address generating section is provided which converts a position on polar coordinates indicated by the direction and distance to an address display on rectangular coordinates based on the direction signal and distance signal from the azimuth and distance address generating section, and the orthogonal coordinate address generating section In a radar scan conversion method in which digital signals on the buffer memory are stored in a video memory having a rectangular coordinate address based on a rectangular coordinate address signal generated by a rectangular coordinate address signal generated by a memory circuit that stores the
a pixel omission memory for determining whether or not the orthogonal coordinate address signal outputted by the orthogonal coordinate address generation section is in the vicinity of the conversion gap address; If it is determined that there is an orthogonal coordinate address signal, the next step is to send out a signal instructing the orthogonal coordinate address generation unit to output the orthogonal coordinate address signal of the conversion gap, and subsequently send the same signal to the buffer memory. A radar scan conversion method characterized by instructing a read address.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20775784A JPS6184573A (en) | 1984-10-03 | 1984-10-03 | Radar scanning conversion system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20775784A JPS6184573A (en) | 1984-10-03 | 1984-10-03 | Radar scanning conversion system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6184573A true JPS6184573A (en) | 1986-04-30 |
Family
ID=16545038
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20775784A Pending JPS6184573A (en) | 1984-10-03 | 1984-10-03 | Radar scanning conversion system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6184573A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02162282A (en) * | 1988-12-15 | 1990-06-21 | Mitsubishi Electric Corp | Scanning converter |
JP2005221247A (en) * | 2004-02-03 | 2005-08-18 | Japan Radio Co Ltd | Radar image forming device |
JP2007051871A (en) * | 2005-08-15 | 2007-03-01 | Yokogawa Electric Corp | Radar image display method and radar image display |
JP2010286359A (en) * | 2009-06-11 | 2010-12-24 | Furuno Electric Co Ltd | Signal processor, radar device including the signal processor, and method of detecting pixel omission of the signal processor |
JP2011021983A (en) * | 2009-07-15 | 2011-02-03 | Toshiba Corp | Meteorological radar device and method of processing radar signal |
-
1984
- 1984-10-03 JP JP20775784A patent/JPS6184573A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02162282A (en) * | 1988-12-15 | 1990-06-21 | Mitsubishi Electric Corp | Scanning converter |
JP2005221247A (en) * | 2004-02-03 | 2005-08-18 | Japan Radio Co Ltd | Radar image forming device |
JP4603272B2 (en) * | 2004-02-03 | 2010-12-22 | 日本無線株式会社 | Shipboard radar image generator |
JP2007051871A (en) * | 2005-08-15 | 2007-03-01 | Yokogawa Electric Corp | Radar image display method and radar image display |
JP2010286359A (en) * | 2009-06-11 | 2010-12-24 | Furuno Electric Co Ltd | Signal processor, radar device including the signal processor, and method of detecting pixel omission of the signal processor |
JP2011021983A (en) * | 2009-07-15 | 2011-02-03 | Toshiba Corp | Meteorological radar device and method of processing radar signal |
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