TW298690B - Radar cross section measurement system implemented with non-uniform amplitude taper wave-front removal technique - Google Patents

Radar cross section measurement system implemented with non-uniform amplitude taper wave-front removal technique Download PDF

Info

Publication number
TW298690B
TW298690B TW82106221A TW82106221A TW298690B TW 298690 B TW298690 B TW 298690B TW 82106221 A TW82106221 A TW 82106221A TW 82106221 A TW82106221 A TW 82106221A TW 298690 B TW298690 B TW 298690B
Authority
TW
Taiwan
Prior art keywords
radar
wavefront
amplitude distribution
amplitude
image
Prior art date
Application number
TW82106221A
Other languages
Chinese (zh)
Inventor
Daw-Jyh Jang
Yih-Ru Fwu
Original Assignee
Defence Dept Chung Shan Inst
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Defence Dept Chung Shan Inst filed Critical Defence Dept Chung Shan Inst
Priority to TW82106221A priority Critical patent/TW298690B/en
Application granted granted Critical
Publication of TW298690B publication Critical patent/TW298690B/en

Links

Landscapes

  • Radar Systems Or Details Thereof (AREA)

Abstract

The implementation of the technique of removing non-uniform amplitude taper wave-front in compact range radar cross sectionmeasurement system is able to increase the accuracy of radar cross section (RCS) measurement result, and effectively increase the quiet zone area. Patent application on this subject includes the technique of removing the effect of non-uniform amplitude distribution of planar wave-front due to finite aperture diameterof the compact range reflector on the test target RCS. This technique utilizes the method of focused imaging of Inverse Synthetic Radar (ISAR) to measure the echoed amplitude andlocation of various scattering points of the test target and theoretically calculates the amplitude distribution of incident planar wave-front. The echoed amplitude of various scattering points of a test target can then be compensated by the given characteristics of amplitude distribution of incident planarwave-front according to the location of the various scattering points. Finally, the compensated echoed amplitude and the corresponded locations of various scattering points are processed in complex vector form to obtain the refined target RCS at specific aspect angles. The process of compensation has been implemented with parallel processing module and incorporated with fast data acquisition system configuration to carry out real-timemeasurement and real-time compensation. Not only the system can promote the accuracy of radar cross section measurement, but the primary benefit is no necessity of any hardware modification, such as increasing the reflector diameter to extend larger quiet zone area, etc., if the test target physical dimension exceeds the specified quiet zone area of the compact range test site. In other words, the implementation effectively increases the quiet zone area and makes the physical dimension of test target no longer confined by the originally specified quiet zone area yet approaches the actual aperture size of the reflector.

Description

經苻部中央结準XJA工消分合作社The Central Government of Xingbei Department approved the XJA Workers ’Consumers Cooperative

A (i 1$ G 五、發明説明(I ) . (1)發明背景: 《 •v 及反伯測等技術的快速進展,例如:隱形★機之應世 ,使得雷達截面積量測技術研發更加重要.β 2.測之雷達截面積,—般皆以縮距量測系統拖11#)^】 内進行量測。基本上,縮距量測使用大型拋物面反射天線 ,使#電波於短距離内,波前相位(Phase) 一致,達到平面波輻射之效 5vV2ii,(Far-Field)量測條件。如圓⑴所示:抛物面反射天線 縮距量測系統。 面天線",以SA5751縮距系统爲代表。其反射天線以拋 么勿面严基;構,並於反射面邊緣附加惩盆版散射结構(Ser rat ed 期产V "邊界散射,(Edge 效應,降低平面波之 振幅鏈波"(Ripple)。如圖(2)所示:鋸齒狀缩距反射面天線。 4· 縮距天ff將5射面錄齒狀邊緣,改進爲徐缓泡逍的遂^结 效降低平面波之”鏈波效應”。如圖⑶: 以鋸齒狀或滾狀結構之缩距反射面天線,其電波輻射場型, f本天〒^寸°此有限的”天線口握”保erature βιζήϋ吏仔气射平面波二振賴分佈,將隨著橫向距離的增加(即遠離 ,其振輪強度類著的衰減。丨此振賴分佈特性,稱之爲” t圖(4)^斤示:銘齒狀及滚狀結構縮距天線,非均勻振幅分佈特性。 線因本質上具有此種特性,使得有效的量測空間,受限於狹有 佈°/ί SA5751錄齒狀‘距天線系统爲例% 在陽'尺寸约12°尺寬,而電波靜域卻只能達4叹宽(以。 衰減量爲標準)。圖(5):實測二维平面振幅分佈特性。 . 6 -若$^加電波靜域範圍,以期能測量較大尺寸之目標物, ^巨反射面天線之尺寸。但是因電波暗室内空間條件的限制、,及‘刑后 情確度等之困難因素,使得加大反以^尺 加電波靜域竓圍的方法,並非理想的改進方向。 曰 7- ^振,分佈消除法之雷達截面積量測系统”, 巧波,波前振幅分佈,經改良後之快速量測控^流 ^線尺寸,即可增加電波靜域範圍,加大可測目 有效可测範固幾可達反射面天線之實際橫向尺寸"物1尺寸其検向 木㈣尺及边财S R;家群⑽S)以規格(21叫297公^· f請先閱請背面之i.t.t事項再M,ftT本Η) 裝. AG Η 6 五、發明説明(么) (2)發明概述: 1. 本索"具波前非均勻振幅#佈消除法之雷達截面積量測系統",發明之目 的,在於解決因縮距平面波,波前振幅非均勻分佈所造成的量測读差及 $大電波靜域之問題.如前項發明·背景所述,以縮距反射面天線▲生的□ 孝電磁波,其相位(Phase)雖能達到波前((Wve Front)—致之特性, 構成平面波(PI ane Wve),如圖(6)所示.但其振幅(/\叩〖i t U(je)卻無法 達到均勻分佈之要求,即波前非均勻振幅分佈,如圓⑺所示..此特性^ 得,測目標物各部位,所照射的電磁波振幅強度不一.波前中心點最強, 愈遠離中心點愈弱,而非實際遠場(Far Field)雷達波所要求的均勻平 面波(thiform Plane Vfive).縮距反射面天線發射時有此誤差,接收目 巧物之回波時.亦經此同一縮距反射面天線·故此波前非均勻振^分佈 於實際量測時呈現雙重誤差之影響.本索發明之目的即欲去除此 波則非均勻振幅分佈所造成的量測誤差. 2. ^用,方法,乃是先以理論計算法"物理光學"(physical Mth〇d )(Ρ〇)與"幾何繞射理論"(Ge〇metri ca〖Theory of Di f fract i on) [i )二分Ϋ縮距反射面天線產生的平面波,各頻段之波前振幅分佈 .觀測資料則以··反 β 成口徑雷達"(Inverse Synthetic Aperture Radar ΗτςΑΡΜ 達,像技術(F〇CUed佐如1· InH£ing),處理各觀測角度之回 得物的雷達影像.據此雷達影像,即可得知目標物各散 置及散射(Scatteri ng)強度·比較各散射點之分佈位置與波前 置,即可得知每一散射點受波前振幅分佈不均‘影響 速但 騐,使確;:^尨^: f紹之 3· 波前非均勻振幅分佈消降法,,^ί多.因此本案爲配合此" 方式,式πη” #严)旋轉量測 ,.非線上型"⑽-Li ne)的1¾以g 制流程並且將 即時資料處理流锃.如此,即可達到^今:^^J a". (Q1七ne)的 達截面積向量合成等一系列f 3像處理,振幅補償及·雷 前非均勻振幅分佈消‘法之雷達構成本案之具波 S家從準(CNS)甲 <;規格(2ΐ〇Χ297公及) 先 間 讀 背 ift 之 注 ,¾ f 項 再 木 η 装 線 經濟-?7十央橾準局员工消費合作社印51 d乂張尺度边;η中 Λ 6 η 6 2^86ύ0 五、發明説明(3 ) (3)發明説明:A (i 1 $ G V. Description of the invention (I). (1) Background of the invention: "• The rapid development of technologies such as v and anti-primary measurement, such as: the introduction of stealth machines, the development of radar cross-sectional area measurement technology More importantly. Β 2. The measured radar cross-sectional area is generally measured within 11 #) ^]. Basically, a large parabolic reflector antenna is used for short-distance measurement, so that # radio waves are in a short distance, and the phase of the wave front is consistent to achieve the effect of plane wave radiation 5vV2ii, (Far-Field) measurement conditions. As shown in circle ⑴: Parabolic reflector antenna shortening measurement system. The surface antenna " is represented by the SA5751 shortening system. The reflective antenna is constructed with a sharp base; it is constructed with a pendulum version of the scattering structure (Ser rat ed period V " boundary scattering, (Edge effect, reducing the amplitude of the plane wave chain wave " (Ripple ). As shown in Figure (2): Sawtooth reduced-distance reflector antenna. 4 · The reduced-distance antenna ff records the 5 shot surface with a toothed edge and improves it to the effect of Xu Bianbuxiao. "Figure ⑶: Reduced pitch reflector antenna with zigzag or roll-like structure, its radio wave radiation pattern, f this day 〒 ^ inch ° this limited" antenna mouth grip "to protect the characteristic βιζήϋ Lizai gas plane wave two The vibration distribution will increase with the increase of the lateral distance (that is, away from the vibration wheel, the strength of the vibration wheel will be similarly attenuated. 丨 This vibration distribution characteristic is called "t diagram (4) ^ Jin shows: Ming tooth shape and roll shape Structured narrow-pitch antenna with non-uniform amplitude distribution characteristics. Due to the nature of the line, the effective measurement space is limited by the narrow cloth ° / ί SA5751 recording tooth-shaped antenna system as an example% in Yang The size is about 12 ° ruler wide, but the static area of the radio wave can only reach 4 sighs (with. Attenuation as the standard ). Figure (5): The measured two-dimensional plane amplitude distribution characteristics. 6-If $ ^ plus the static range of the radio wave, in order to be able to measure larger size targets, ^ the size of the giant reflector antenna. However, due to the radio wave in the dark room The limitations of space conditions, and the difficult factors such as the accuracy of post-sentence conditions, make the method of increasing the static wave envelope of the radio wave by the ruler is not an ideal direction of improvement. 7- ^ Vibration, distributed elimination radar "Cross-sectional area measurement system", clever wave, wavefront amplitude distribution, improved rapid measurement and control ^ flow ^ line size, you can increase the static range of the radio wave, increase the effective measurement range Reflective antenna's actual lateral size " object 1 size, its vertical direction, length and margin SR; family group ⑽S) with specifications (21 called 297 g ^ · f, please read the matters on the back and then M, ftT Η) outfit. AG Η 6 5. Description of the invention (2) (2) Overview of the invention: 1. This cable " Radar cross-sectional area measurement system with wavefront non-uniform amplitude # cloth elimination method ", the purpose of the invention, It is to solve the measurement reading difference and the large value caused by the plane wave with reduced distance and the uneven distribution of the wavefront amplitude The problem of the static region of radio waves. As described in the previous invention and background, the □ filial electromagnetic wave generated by the reduced-reflection surface antenna ▲, although its phase (Phase) can reach the wave front ((Wve Front) -consistent characteristics, constitute a plane wave ( PI ane Wve), as shown in figure (6). But its amplitude (/ \ 叩 〖it U (je) can not meet the requirement of uniform distribution, that is, the wavefront non-uniform amplitude distribution, as shown by circle ⑺. Characteristic ^ It is obtained that the amplitude of the electromagnetic wave irradiated by the target object is different. The center of the wavefront is the strongest, and the farther away from the center, the weaker, rather than the uniform plane wave (thiform) required by the actual far field (Far Field) radar wave. Plane Vfive). This error occurs when the reduced-distance reflector antenna transmits, and when it receives the echo of the object. It also passes through the same reduced-distance reflector antenna. Therefore, the non-uniform vibration of the wavefront ^ distributed in the actual measurement presents a double error The effect of the invention of this cable is to remove the measurement error caused by the non-uniform amplitude distribution of this wave. 2. The method is to use the theoretical calculation method "Physical Optical" (physical Mth〇d ) (Ρ〇) and "Geometric diffraction theory" (Ge〇metri ca 〖Theo ry of Di f fract i on) [i) The plane wave generated by the bisection Ϋ-shrinking reflector antenna, the wavefront amplitude distribution of each frequency band. The observation data is based on the inverse Synthetic Aperture Radar ΗτςΑΡΜ reached , Like the technology (F〇CUed Zuoru · InH £ ing), processing radar images of the returned objects at each observation angle. Based on the radar images, you can know the scattering and scattering intensity of the target objects. Comparing the distribution position of each scattering point and the wave front, you can know that each scattering point is affected by the uneven distribution of the wavefront's speed, but the test is accurate ;: ^ 尨 ^: f Shaozhi3 · Non-uniform wavefront Amplitude distribution reduction method, there are many ^ ί. Therefore, this case is to match this " method, type πη ”# 严) rotation measurement, non-linear " ⑽-Li ne) 1¾ to g process and will be instant Data processing flow. In this way, you can achieve a series of f 3 image processing such as ^ present: ^^ J a ". (Q1 七 ne) up to cross-sectional area vector synthesis, amplitude compensation and non-uniform amplitude distribution before the thunder The radar of the law constitutes the standard S wave of the case (CNS) A <; specifications (2 〇297) and first Recalling ift's note, ¾ f items are re-installed in the economy of η-? 7. The central consumer ’s consumer cooperative of the 10th Central Committee prints 51 d to the scale side; η 中 Λ 6 η 6 2 ^ 86ύ0 V. Description of the invention (3) ( 3) Invention description:

•V 發明之詳細説明;概分爲兩大部份分述如下: .1 A波前非均勻振幅分倚消除法. B.快速雷達截面積量測系統. A·波前非均勻振幅分佈消除法 1.波前振輻分佈特性計算: 以"物理光學"(PO)及•'幾何繞射理論”(CTD)計算縮距反射面天線,於任 一量測頻率之平面波輻射場型包括波前相位分佈及振幅分佈,如圖(6) :波前相位分佈特性及圖(7):波前振幅分佈特性。並建立成資料檔案 ,以供振輻補償時應用.^ 彳0'::::: 2-聚焦雷遠影像處理: .0請先閲讀背面之iit事項再填寫本頁) 截以距角構j:,xc相 達)*等各結域正Μ之 雷ctJL-私的象修y點 般pe小應器波當1射 1尨大對射電適用散 -1.^.. 測|置化&先-5及 積以向之意輕必㈣位 面认橫度示初則吨對 .^"fe 於 requ 物"116 llccbr N:(f=右泠相Lr,Al 辭値器:橫振WIS: f虐射9)之前釗''(1 4響反«(懲0| 像波 且置影 小放、&纟 大越佈π 同跨分u 之 等距響 距離 分 回 t 3 ¥"ί 以同積反的乍應I RCV.相㈤角叹約^.物 影強標 量:5¾¾佈射目 測 > 轉k已分散知 —,^η上此其得 度圏Γ)以際對及可 角如 測,例 ί T/- tl"實欲置即 若位 裝. 線 G^>〇 = I:5£(/,0exp (2(χθ-γ) λ (1) 經苻部屮央榇準局β,-χί?奸合作社..5-^ E(J、θ) G〇,少) θ Λ X y 目標物雷遠回波,電場強度測量値. 目標物雷達影像. :测量頻率. :觀测角度 :測量波長-A = c// ; C:光速 :橫向座標(Cross Range) :縱向座標(Dbwn Range)• V Detailed description of the invention; it is divided into two parts and described as follows: .1 A wavefront non-uniform amplitude separation and elimination method. B. fast radar cross-sectional area measurement system. A · wavefront non-uniform amplitude distribution elimination Method 1. Calculation of the distribution characteristics of the wavefront vibration and radiation: Calculate the reduced-distance reflector antenna using " physical optics " (PO) and • 'Geometric Theory of Diffraction' (CTD), and the plane wave radiation pattern at any measurement frequency Including the wavefront phase distribution and amplitude distribution, as shown in figure (6): wavefront phase distribution characteristics and figure (7): wavefront amplitude distribution characteristics. It is established as a data file for application in vibration compensation. ^ 彳 0 ' ::::: 2- Focused Lei Yuan Image Processing: .0 Please read the iit matters on the back and then fill in this page) Intersection angle structure j :, xc phase)) * etc. Private as a repair y point pe small applicator wave when 1 shot 1 尨 large for radio application scattered -1. ^ .. measurement | set & first -5 and product with the intention of lightness must be recognized by the plane At the beginning of the show, there are tons of pairs. ^ &Quot; fe in requ objects " 116 llccbr N: (f = right Lingxiang Lr, Al vocalizer: transverse vibration WIS: f abuse shot 9) before Zhao '' (1 4 rings Reverse «(Penalty 0 | Da Yuebu π, the equal span distance of the same span sub u is divided back to t 3 ¥ " ί Chaying I RCV with the same product. Phase angle sigh approx. ^. Object shadow strength scalar: 5¾¾ cloth shot visual observation> turn k It has been known that, ^ η has its degree of success Γ) with the international pair and the angle can be measured, for example ί T /-tl " If you really want to set it up, install it. Line G ^ > 〇 = I: 5 £ ( /, 0exp (2 (χθ-γ) λ (1) Jingjubu quasi-preparation quasi-bureau β, -χί? Rape cooperative .. 5- ^ E (J, θ) G〇, less) θ Λ X y target Thunder distance echo, electric field strength measurement value. Target radar image.: Measurement frequency.: Observation angle: Measurement wavelength -A = c //; C: Speed of light: Horizontal coordinate (Cross Range): Vertical coordinate (Dbwn Range )

3. fe濟部中夬標準局貝工消費合作社印夂 A6 B6 亦’振利愈來會影 度前,得開,之 強波外使散響^-.· 其知之,分影焦法 ,得此點而的聚換 同可除,缺大散全轉 不亦。之加擴用葉 的此性散的點採立 置由重擴離焦案傅 位。嚴點距種本速 置弱之焦旋此。快' 放愈度有Μ,。差价 向度確會因般誤1) 橫強準因會一成1( 因射測,,糊造Θ 器反#-像度模,Μ 射,積影強像償Φ 反點面達射影補£* 角心截雷敢得的ii 個中達之的使佈XII 五向雷得點,分;g 出橫..響求射確幅g 看離影換氣準振封 顯遠,轉之不勻g ) 明愈佈葉心距均g 可。分±-中焦非,^ /V ,同勻傅轉同來法 明像不均速旋如將理 説影著非快離就得處 月 #顯幅用遠。使像 G(^^)=ZI:£(/)0exp 一 J2 ‘ r2(λ:sin Θ-ycos^) 五(/,的:目標物雷達回波,電場強度測量値. G(x,>〇 :目標物雷達影像· 測量頻率. 觀測角度 測量波長· ;l = c// ;、f:光孝 橫向座標(〇oss RangS5'_ 縱向座標(Ebwn Range)3. The Ministry of Economy, China, Bureau of Standards and Technology, Beigong Consumer Cooperatives, India A6 B6, also said, 'Zhenli is getting more and more popular before it can be opened, and the strong wave makes it disperse ^-. · As it is known, the split-focus method, Those who get this point can also be exchanged, and all can be changed if they are lacking. In addition, the use of Ye's disperse point is set up by re-expansion. Strictly set the focal point at a weaker speed. Fast 'The degree of release is Μ ,. The difference direction will indeed be wrong because of the normal 1) The horizontal strong quasi-factor will be 10% (due to the radiographic test, the Θ device is reversed # -likeness mode, M shot, and the strong image compensation is Φ. £ * The ii among the ii who dared to take the thunder and dared to get it made the XII five-way thunder score, points; g out of the way .. Xingqiu shot the exact range g. Uneven g) The distance between the heart of Mingyu cloth is g. Points ± -middle focus, ^ / V, homogeneity, Fu to the same method. Uneven speed of the image, like general theory. If the shadow is not fast, you have to be away. Make the image G (^^) = ZI: £ (/) 0exp-J2 'r2 (λ: sin Θ-ycos ^) Five (/ ,: the radar echo of the target, the electric field strength measurement value. G (x, > 〇: target radar image · measurement frequency. Observation angle measurement wavelength ·; l = c //;, f: Guangxiao horizontal coordinate (〇oss RangS5'_ longitudinal coordinate (Ebwn Range)

θ λ X y (請先«讀背面之.;±意事項再塡寫本頁) (2) 此方法對任一散射點位置之旋轉位移,都以予修正處理,可得到全聚 焦之雷達影像,無能量擴散的問題。如圖(II):五個角反射器之全聚 焦雷達影像。圖(10)非聚焦影像’此處全衆焦影像所顯示之橫向 回波衰減,則非均勻振幅分佈之影響,而無焦點擴散之情行。 於此,即可進订非均勻振幅補償工作。 波前非均勻振幅補償: 利用步驟步^2),振幅分佈計算及全聚焦雷達影像之結果,依 其空間相對仨置,對各個散射點強度做振幅補償: G(x,y) = 〇(x^y) .T(x,y) (3) —裝 訂. .線( 本紙張尺度適用中國g家標半(CN.S) ψ 4規格(21C1 χ 297公 82. 9. 0.000 Λ (; IUi 五、發明説明(岁) G(x,_v):振幅補償後之雷達影像。 G(x,_y) ··振择補償前之雷達影像。 八%,·)^):參'考點的波前振幅強度。 ! 八义少):.,波前非均勻振幅分佈特性。 在本朴tv —次平方1 ’乃考慮量測時發射及接收振幅分佈之雙重影響. ίϊίΐίίί選擇波前振幅最大値之位置亦即是量測系統之校正點. 達’即已去除波前非均句振幅分佈之影響。圖 之^ 1全聚焦雷達影像的五個角反射器,顯 巧料她齡佈之影響已完全去除 截面積値,無法全然相同,此乃因焦聚擴散之故。由逆 散射點影像向量合成: ίϊίϊ f ’其if散胸可細難置及觀冽頻 處理過程,得ί;目ώ各觀亦即是(式·反向 Μ 先 閲 in 背 而 之 注 * 項 再 % 本 左(/,^)= ΣΣ(5(λ:,少)exf 七j2n 2(xsin Θ- j/c〇s6»)V - l A J 一 ⑷ 經濟部中央標準局员工消分合作社印5i G〇^v):振幅補償後之雷達影像。 办亦,幅^^目標物雷達回波,電場 . /:測里頻率. θ :觀測角度乂 :巧量波長.a=c// : c:光 义:棱向座標(Cr〇Ss Range) 、 少:縱向座標(Dnvn Range) 從上式之振幅祕後的電韻度㈣故(/ 目標物雷賴面積〇(/,0: 〇(/,&) Ε{/,Θ) Ε, (5) i Λ 度 尺 rR fj 紙 本 S家榀準(CNS) Ή規格(210父297公龙:) Π ()五、發明説明(6) 左(/,的:振幅補償後的電場強度測量値. 〇</,句··振幅補償後的目標物雷達截面積. 尽:系統校正之電場強度量測値. K:供系统楝正之標準銅球的雷達截面積. 圖(H):經振幅捕償後,五個角反射器之雷達截面積針成久户 峰値t增加3MdB。此爲去除了波前非均勻振幅分 5 ·平行處理式振幅補償流程 B s i i i J ^ 如行㈣,度度像影時 程^/s.·^.角角影的即 I圖像將補率流時JB測測作次可 之及影,幅效償同IL量量角一償。 度5)達理振理補亦α以當當65後捕償 角(1雷處及處幅時0.Μ。而第最幅補 測囷焦算理昇振測爲8j理。對,振幅 觀如聚計處提Bf·量隔12處償,時之振 個例全的像幅即波間需像補間束積行 各。器複影大之微測理影幅區結面進 於之射繁,可案於量處行振理測截始 野理反,測即本作,之進及處量達開 (2補補當.,適、. 循,需相須. 取角皆作只 t測角X-則 皆觀測償, ,度觀補行 値30個幅進 測爲一振時 量6)每得同 价U。使償 圖 則 ·*/ 達達處像顯 使待紂Ml T。償需:3气時時pi 所而仏㉔⑽⑽振及果 (1舉'Jll第第理處示 償償耗當.?:得測 處角是觀, 驟個的將程 步五期能流 償之預若理 補後〒,處 幅償故是則 振補,但 5)與理。.良 以前處晚教 5 . ^ 工度'^3雜度雷才 貧书達度像爲固吏完 射至雷角影角7<t5r 系ο固固乍9-,v 幅-9;5碓^:12後理動 振由料貼以第最處测 勻需^w^6至當始量 均度f料料料,開有S5f;;!llss 幅需即則 (-先間請背而之"-"賀項再项寫本?1- ,¾ 統 系 則 ··/ 量 積 面 截 Lr~ I 璉 雷速 快 B- 經濟部屮央標準而员工消赀合作社印^ Μ量料 續資度測”特開 1#州測角歡物至, 速(L量多個標台统 快”之置1目平系 積#物料形定畢 面以*標資情設完 截5”目此佈達描 達§物測。分到掃 雷㈣標#;波、I當待 頻Μ目將回點,, 變封到是達射度描 ,U得即雷散角掃 度']0可,之”测頻 tig,测度向觀多 則 ··/ 量 同 不 置經傳度後和。角之 頻I㈣,處乃然台 性沾^上像,,平 漆_)4台影式轉#· ” kge平之方旋旋 以lbn轉式測止動 :MR,旋焦量停趨 法£ I 一聚的,再 方⑭DD於全統後 率 線點 射 量·理是後至 式負f物到轉波觀 方射;ζ標得旋微個 變.S 3目,制啓一 Mi-t測法控開下 遏 度 尺 張 本 CN /V 準 <?: 家 s 格 樹 & ,9 五 7 /(V 明 説 明 發 TV -HT'US. ,"。十搾 測作氣轉時味,人角數勻~ 量X始旋即I1JL統測紛均一 式測私。的.jf系如縮非JI 進量從度台> 號理止可前^ 步度台角平訊t終,波;2 種角平測轉波像達式得'# 此多轉觀旋回影到方使t' 。得.炎止視錄並t 測使設終監記列直φί,成 量,預之時行陣,统多構 行缓是設隨即理測ί#.良Γ. 進遲乃預亦,處量:5益的, 度應,至式時行續較助)i.*K 角反式轉程度平持比昇nfi£ 測的方旋制角至此,於έ-:ειιι f測的控測送如式之1-錄 動之.速.控達量⑼理a'JJ以4 平案當I角立7#办,償^ 篇揉IEW度 ΓΒΕ iii 此 ill 系統架構:如圖(〗8)所示 K微電算機量測控制系統:VAX38〇0 Cbnputer。 2 波量測系統 * RM9 Radar System® 3.縮距天線及旋轉平台:Compact Range System。a rv I 4·,行處理陣列系統:Μφ4000知ray: & οη ° 1 5.影像處理系统:pS390 inage Pr〇cess〇I·。 6·資料傳送網路結構 :Ethernet and Q~Bus。 V^BSOO微電算機爲整個量测系統的主控中心,負各 傳送等工作。微波量測系統以鹏·網路分析&主g 步^ 波訊號之健《收。縮m爲S廳1 置於電波St室(*1。陣列平行處理以腦_^轉平口门 十個運算器組成,可同時處理數個雷達影像’並且進行g 理系统爲_,負责影像顯示及輸出。所有的系5像卷 經濟部+央標準局ΚΧ工消费合作社印y 本紙5R尺度边用中S K家砟準(CKS)甲4規格(21 (1X 297公龙) (請先間讀背而之汰意事項存培寫本茛)θ λ X y (please first «read the back of the page .; ± and then write this page) (2) This method can correct the rotational displacement of any scattering point position to obtain a fully focused radar image , No energy diffusion problem. Figure (II): Full-focus radar image of five corner reflectors. Figure (10) Non-focused image ’The lateral echo attenuation shown in the full-focus image here is affected by the non-uniform amplitude distribution without focus diffusion. Here, the non-uniform amplitude compensation can be ordered. Wavefront non-uniform amplitude compensation: Using step 2), the amplitude distribution calculation and the results of the all-focus radar image, according to their spatial relative position, do amplitude compensation for the intensity of each scattering point: G (x, y) = 〇 ( x ^ y) .T (x, y) (3) —Binding.. Line (This paper scale is applicable to China g home standard half (CN.S) ψ 4 specifications (21C1 χ 297 male 82. 9. 0.000 Λ (; IUi V. Description of invention (years old) G (x, _v): Radar image after amplitude compensation. G (x, _y) ·· Radar image before vibration selective compensation. 8%, ·) ^): Refer to the test site Wavefront amplitude intensity.! Eight meanings less):., Wavefront non-uniform amplitude distribution characteristics. In Benpu tv—the sub-square 1 'is to consider the dual effect of the amplitude distribution of the transmission and reception during measurement. The location where the maximum amplitude of the wavefront amplitude is selected is also the calibration point of the measurement system. The effect of the average sentence amplitude distribution. Figure ^ 1 The five corner reflectors of the fully-focused radar image show that the influence of her age cloth has been completely removed. The cross-sectional area value cannot be completely the same. This is due to coke diffusion. Image vector synthesis from inverse scattering point: ίϊίϊ f 'if if the chest can be difficult to set up and observe the frequency processing process, get ί; every view is also (form · reverse Μ first read in the back note * Item re%% Left (/, ^) = ΣΣ (5 (λ :, less) exf seven j2n 2 (xsin Θ- j / c〇s6 ») V-l AJ I⑷ Ministry of Economic Affairs Central Standards Bureau employee consumption cooperative 5i G〇 ^ v): Amplitude compensated radar image. Also, the amplitude ^^ radar echo of the target, electric field. /: Mileage frequency. Θ: Observation angle q: clever wavelength. A = c // : c: Light meaning: Orthogonal coordinates (Cr〇Ss Range), Less: Longitudinal coordinates (Dnvn Range) From the amplitude of the above formula, the electrical rhythm after the secret (// the target object area 〇 (/, 0: 〇 (/, &) Ε (/, Θ) Ε, (5) i Λ ruler rR fj Paper S home standard (CNS) Ή specification (210 father 297 male dragon :) Π () V. Description of invention (6) Left (/ ,: the amplitude-compensated electric field strength measurement value. 〇 < /, sentence ·· Amplitude-compensated target radar cross-sectional area. Exhaust: system-corrected electric field strength measurement value. K: for The radar cross-sectional area of the standard copper ball of the Neem system. Figure (H): After amplitude compensation , The radar cross-sectional area of the five corner reflectors is increased by 3MdB to the peak value of Kyudo. This is to remove the non-uniform amplitude of the wavefront. 5 · Parallel processing type amplitude compensation process B siii J ^ Such as ㈣, degree image Time history ^ / s. · ^. The angle angle shadow is the I image, and the JB measurement of the compensation rate flow is the second best. The amplitude effect compensation is the same as the IL measurement angle. Degree 5) Dali vibration Compensation α is based on the current compensation angle when the angle is 65 (1 thunder and the amplitude is 0.Μ. And the first amplitude compensation measurement of the coke calculation algorithm is 8j. The right, the amplitude view is like the aggregate. Compensation is made at 12 locations, and the full-time image amplitude, that is, the inter-wavelength needs to be compensated by the beam between the beams. The micro-measurement of the large-scale image of the device, the area of the image area, is complicated, and the case can be measured at the volume. Vibration measurement is reversed from the beginning of the field, the measurement is the original work, and the advancement and the amount of measurement are up to (2 complements., Suitable ,. follow, need to be required. The angle is taken as only the angle X is measured Compensation, and observing the value of 30 lines are measured as a single shock hour. 6) Every time you get the same price U. Make compensation plan * / Dada where the image is to be displayed. Ml T. Compensation: 3 gas hours When the pi is in place, it ’s ⑽ ⑽ Vibration and fruitfulness. , After a short period of time, the advancement of Chengbu ’s five-stage energy compensation will be compensated, and the compensation will be compensated, but 5) It ’s reasonable.............. The image of Du Lei Cai Po Shu Da Du is that after shooting from the bureaucracy to the thunder angle 7 < t5r system ο Guguzha 9-, v amplitude -9; The leveling needs ^ w ^ 6 to the original measurement of the average f material, there is S5f ;;! Llss The width needs to be the case (-first please turn back "-" He Xiang then write? 1- , ¾ System rules · // Volumetric area cut-off Lr ~ I 鐏 雷 速 快 B-Standard of the Ministry of Economic Affairs and Employee Consultation Cooperative Society ^ ΜQuantity Renewal Measure "特 开 1 # 州 测 角 欢 物To, the speed (L amount of multiple standard stations unified fast "set 1 mesh level system product # material shape is finished with * standard capital setting is completed 5" mesh this Budasida § physical survey. Divided to sweep mine ㈣ 标 #; wave, I will return to the point when the frequency is waiting, change it to reach the trajectory, U is the thunder angle sweep '] 0 can be, the "frequency measurement tig, measurement direction Many views ·· / The amount is the same as the sum without the transmission. The frequency of the angle I ㈣, where the platform is stained with the image ^ ,, flat paint _) 4 sets of shadow type turn # · ”kge flat square spin to lbn Rotational measurement stop: MR, focal rotation stop trend. I gather together, then ⑭DD after the whole system, the rate of point shots Spin a little change. S 3 mesh, make a Mi-t measurement method to control the opening and closing ruler Zhang Ben CN / V quasi <?: Home s grid tree &, 9 5 7 / (V 明 说明 发 TV- HT'US., &Quot;. Ten squeezes are used as a taste, and the number of corners is even ~ The amount X starts to rotate, that is, the I1JL unified measurement has a uniform type of private measurement. The jf is like a non-JI input from the degree table> The signal can only be advanced ^ Step angle angle measurement t end, wave; 2 kinds of angle measurement rotation wave image reaching type '# This multi-rotation view rotates back to the side to make t'. 得. 炎 止 视 录 与 t The test is to set the final supervision record straight φί, the quantity, the line when the time is predicted, the system is multi-structured and the line is set up, then the test is made immediately ## 良 良. , Disposal: 5 benefits, degrees should be continued to help when the formula) i. * K angle trans turn degree flatness ratio nfi £ measured square rotation angle to this point, measured in the-: ειιι f Control and test delivery as in the form of 1-record. Speed. Control amount ⑼Li a'JJ with 4 flat cases as I 角 立 7 # Office, compensation ^ Article rubbing IEW degrees ΓΒΕ iii This ill system architecture: as shown in the figure ( 8) The measurement and control system of the K microcomputer shown: VAX38〇0 Cbnputer. 2 Wave measurement system * RM9 Radar System® 3. Short-range antenna and rotating platform: Compact Range System. a rv I 4 ·, row processing array system: Μφ4000 know ray: & οη ° 1 5. Image processing system: pS390 inage Pr〇cess〇I. 6. Data transmission network structure: Ethernet and Q ~ Bus. The V ^ BSOO microcomputer is the main control center of the entire measurement system, which is responsible for the transmission and other tasks. The microwave measurement system is based on Peng · Network Analysis & Main g Step ^ "Walk Signal". Reduce m to S hall 1 and place it in the radio wave St room (* 1. The array parallel processing is composed of ten operators of brain_ ^ turning the flat door, which can process several radar images at the same time and the system is responsible for imaging. Display and output. All of them are printed on 5 rolls by the Ministry of Economic Affairs + Central Standards Bureau KKX Consumer Consultation Co., Ltd. 5R standard side paper used in the SK home ballast (CKS) A 4 specifications (21 (1X 297 male dragon) (Read the back-to-back matters and save the textbook)

Λ 8 Β8 C8 D8 298690 ffl式 圖例説明: 圖(1):抛物面反射天線,缩距雷遠截面積量測系統。. 圖(2):鋸齒狀邊緣縮距反射面天線。 圖(3> :滾狀邊緣缩距反射面天線。 圖(4):鋸齒狀及滾狀縮距系统,波前振幅分佈特性。 圖(5):實測二維平面,波前振幅分佈特性。 囷(6):波前相位分佈特性,理論計算。 圖(7):波前振幅分佈特性,理論計算。 圖(8):補償前,五個角反射器之雷達截面積値。 圖(9):相同大小且等距橫向放置之五個角反射器結構示意圖。 圖(10):振幅補償前,五個角反射器之非聚焦雷達影像。 圖(11):振幅補償前,五個角反射器之聚焦雷達影像。 圖(12):振幅補償後,五個角反射器之聚焦雷達影像。 圖(13):振幅補償後,五個角反射器之非聚焦雷達影像。 圖(14):振幅補償後,五個角反射器之雷達截面積値。 圖(15) : 30度觀測角,振幅補償前,五個角反射器全聚焦雷達影像。 圖(16) : 30度觀測角,振幅補償後,五個角反射器全衆焦雷達影像。 圖(17):波前非均勻振幅補償,即時平行處理流程。 圖(】8):快速雷達截面積量測系統,系統方塊圖。 ......................................................'^ 一琦先間"背而之注意事項再行蜻製) 線 經濟部中央標f-局!e工消费合作社印¾ 2Λ 8 Β8 C8 D8 298690 ffl type Legend illustration: Figure (1): Parabolic reflector antenna, measurement system for the reduced cross-sectional area of thunder and lightning. . Figure (2): Reflector antenna with jagged edges and reduced pitch. Figure (3>: Rolled-edge reduced-distance reflector antenna. Figure (4): Sawtooth and roll-shaped reduced-distance systems, wavefront amplitude distribution characteristics. Figure (5): Actually measured two-dimensional plane, wavefront amplitude distribution characteristics.囷 (6): Wavefront phase distribution characteristics, theoretical calculation. Figure (7): Wavefront amplitude distribution characteristics, theoretical calculation. Figure (8): Before compensation, the radar cross-sectional area value of the five corner reflectors. Figure (9) ): Schematic diagram of the structure of five corner reflectors of the same size and equidistantly placed horizontally. Figure (10): Before the amplitude compensation, the unfocused radar image of the five corner reflectors. Figure (11): Before the amplitude compensation, the five corners Focused radar image of reflector. Picture (12): Focused radar image of five corner reflectors after amplitude compensation. Picture (13): Unfocused radar image of five corner reflectors after amplitude compensation. Picture (14) : After the amplitude compensation, the radar cross-sectional area of the five corner reflectors. Figure (15): 30 degrees observation angle, before amplitude compensation, the five corner reflectors focus the radar image. Figure (16): 30 degrees observation angle, After amplitude compensation, the five-angle reflector all-focus radar image. Figure (17): Non-uniform wavefront amplitude Compensation, real-time parallel processing flow. Figure (】 8): Fast radar cross-sectional area measurement system, system block diagram ............................... ............................. '^ Yiqi first time " Contrary to the precautions and then do the dragon system) Ministry of Line Economy Central standard f-bureau! Printed by e-consumer cooperatives 2

Claims (1)

公告恭Announcement A8 B8 C8 D8 ^ [Ο,ΊA8 B8 C8 D8 ^ [Ο, Ί 申請專利範圍 經漓部中央標準局爲工消费合作社印製 I—種波前非均勻振幅分佈消除方法,其包含下列步驟; (1) 以反合成口徑雷達全聚焦雷達影像處理,將待測目標物的回波信號轉換成 雷纖像之步驟J (2) 以反射面之波前非均勻振幅分佈特性,對該目標物的雷達影像,施予發射 及接收雙重振幅補償ί (3) 將該振幅補償後之雷達影像,以向量合成法,合成各散射點之回波強度, 轉換成已消除波前非均勻振幅分佈影響的雷達截面積量測値。 2. 如申請專利範圍第1項所述之一種波前非均勻振幅分佈消除方法,其中包爸以 物理光學及幾何繞射理論,分析反射面之波前非均勻麵分佈特性。 3. 如申請專利範圍第ί項所述之一種波前非均勻振幅分佈消除方法,其中包含以 全聚焦雷達影像方法,處理目標物之雷達影像,以獲得該目標物各個散射點之 正確位置及回。 4·—種具有可消除波前非均勻振幅分佈之雷達截面積量測系統,其包含下列裝 置; (1) 用以統合控制雷達截面積量測系統^作之量測控制裝匱? (2) 用以發射電磁輻射及接收回波訊號之微波量測裝置> (3) 用以將球面電磁波反射成平面波之反射面天線, (4) 用以支撐目標物並使之旋轉至各量測角度之旋轉平台> (5) 利用第1項之波前非均勻振幅分佈消除方法,處理目標物雷達影像之影像 處理裝置? (6) 利用第1項之波前非均勻振幅分佈消除方法,處理振幅補償之平行陣列處 理裝置。 5. 如申請專利範圍第4項所述之一種具有可消除波前非均勻振幅分佈之雷達截面 積量測系統,其中旋轉平台受量測控制系統之控制’以持續且適當配合微波掃 描速率之旋轉速度,連續量測目標物各個觀測角度之回波強度。 6. 如申請專利範圍第4項所述之一種具有可消除波前非均勻振幅分佈之雷達-面 積量測系統,其中影像處理裝置,係以PS390影像處理器爲主架構,可同時 處理數個連續觀測角度目標物回波之全聚焦雷達影像。 7. 如申請專利範圍第4項所述之一種具有可消除波前非均勻振幅分佈之雷達截面 積量測系統,其中平行陣列處理裝置,係以MAP4000陣列處理器爲主架構’ 可同時平行處理目標物雷達影像之波前非均句振幅分佈雙重補償,並且時以 向量合成法,將振幅補償後之雷達影像轉換成該目標物的雷達截面積値。 本纸張尺度適用中國國家標準(CNS ) Λ4規格(21〇Χ2§7公釐) (請先閲讀背面之住意事項再填寫本頁) M !The scope of the patent application was printed by the Central Bureau of Standards of the Ministry of Li for the I-type wavefront non-uniform amplitude distribution elimination method for industrial and consumer cooperatives, which includes the following steps; (1) The anti-synthetic caliber radar full-focus radar image processing, the target to be measured Step J of converting the echo signal of the object into a laser fiber image (2) Using the non-uniform amplitude distribution characteristics of the wavefront of the reflecting surface, the radar image of the target object is subjected to double amplitude compensation for transmission and reception. (3) After the amplitude compensation, the radar image is synthesized by the vector synthesis method, and the echo intensity of each scattering point is synthesized and converted into a radar cross-sectional area measurement value that eliminates the influence of the non-uniform amplitude distribution of the wavefront. 2. A method for eliminating wavefront non-uniform amplitude distribution as described in item 1 of the patent application scope, in which Bao Da uses physical optics and geometric diffraction theory to analyze the wavefront non-uniform surface distribution characteristics of the reflecting surface. 3. A wavefront non-uniform amplitude distribution elimination method as described in item ί of the scope of the patent application, which includes using a full-focus radar image method to process the radar image of the target object to obtain the correct position of each scattering point of the target object and return. 4. A kind of radar cross-sectional area measurement system with non-uniform amplitude distribution of the wavefront, which includes the following devices; (1) The measurement control equipment used for the integrated control of the radar cross-sectional area measurement system? (2) Microwave measuring device for transmitting electromagnetic radiation and receiving echo signals> (3) Reflective surface antenna for reflecting spherical electromagnetic waves into plane waves, (4) Supporting target objects and rotating them to each Rotating platform for measuring angle> (5) An image processing device that processes the radar image of the target object using the wavefront non-uniform amplitude distribution elimination method of item 1? (6) A parallel array processing device that handles amplitude compensation using the wavefront non-uniform amplitude distribution elimination method of item 1. 5. As described in item 4 of the patent application scope, a radar cross-sectional area measurement system with non-uniform amplitude distribution of the wavefront is eliminated, in which the rotating platform is controlled by the measurement control system to continuously and properly match the microwave scanning rate The rotation speed continuously measures the echo intensity of each observation angle of the target. 6. A radar-area measurement system with wavefront non-uniform amplitude distribution as described in item 4 of the patent application scope, where the image processing device is based on the PS390 image processor and can process several Fully-focused radar image of the echo of the target at a continuous observation angle. 7. As described in item 4 of the patent application scope, a radar cross-sectional area measurement system with non-uniform amplitude distribution of the wavefront can be eliminated. The parallel array processing device is based on the MAP4000 array processor. The wavefront non-uniform sentence amplitude distribution of the target radar image is double compensated, and the vector image synthesis method is used to convert the amplitude compensated radar image into the target radar cross-sectional area value. This paper scale is applicable to the Chinese National Standard (CNS) Λ4 specification (21〇Χ2§7mm) (Please read the matters on the back before filling this page) M!
TW82106221A 1993-08-04 1993-08-04 Radar cross section measurement system implemented with non-uniform amplitude taper wave-front removal technique TW298690B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW82106221A TW298690B (en) 1993-08-04 1993-08-04 Radar cross section measurement system implemented with non-uniform amplitude taper wave-front removal technique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW82106221A TW298690B (en) 1993-08-04 1993-08-04 Radar cross section measurement system implemented with non-uniform amplitude taper wave-front removal technique

Publications (1)

Publication Number Publication Date
TW298690B true TW298690B (en) 1997-02-21

Family

ID=51565510

Family Applications (1)

Application Number Title Priority Date Filing Date
TW82106221A TW298690B (en) 1993-08-04 1993-08-04 Radar cross section measurement system implemented with non-uniform amplitude taper wave-front removal technique

Country Status (1)

Country Link
TW (1) TW298690B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108983195A (en) * 2018-08-17 2018-12-11 桂林电子科技大学 Target radar scattering cross-section product measurement method based on subarray self adaptive imaging
EP3584590A1 (en) * 2018-06-20 2019-12-25 Rohde & Schwarz GmbH & Co. KG Measurement method and system for increasing the effective size of a quiet zone

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3584590A1 (en) * 2018-06-20 2019-12-25 Rohde & Schwarz GmbH & Co. KG Measurement method and system for increasing the effective size of a quiet zone
US10914774B2 (en) 2018-06-20 2021-02-09 Rohde & Schwarz Gmbh & Co. Kg Measurement method and system for increasing the effective size of a quiet zone
CN108983195A (en) * 2018-08-17 2018-12-11 桂林电子科技大学 Target radar scattering cross-section product measurement method based on subarray self adaptive imaging
CN108983195B (en) * 2018-08-17 2022-08-30 桂林电子科技大学 Target radar scattering sectional area measuring method based on subarray adaptive imaging

Similar Documents

Publication Publication Date Title
Unwin et al. Superluminal motion in the quasar 3C 345
EP3647826A1 (en) Multiple-transmitting multiple-receiving antenna array arrangement for active millimeter wave security inspection imaging, and human body security inspection device and method
CN107941168B (en) Reflective stripe surface shape measuring method and device based on speckle position calibration
CN1800794A (en) laser beam quality measuring device
TW298690B (en) Radar cross section measurement system implemented with non-uniform amplitude taper wave-front removal technique
CN110703245A (en) Foundation SAR multi-angle image registration method based on homonymous point matching and DEM assistance
CN105866771A (en) Hidden object detecting system and detecting method thereof
Freethy et al. Lensless passive and active microwave imaging on MAST
Karakostas et al. Grain boundary analysis in TEM. I. Practical determination of bicrystal orientations
CN114910179B (en) Method for measuring partial coherent vortex beam topological charge shielded by obstacle
CN2890864Y (en) Laser Beam Quality Measuring Device
Altman et al. Efficient models for base station antennas for human exposure assessment
CN110618151A (en) Method for rapidly judging strength of magnetic permeability of FeSiAl material
Gu et al. Fast computation of electromagnetic scattering from a metal–dielectric composite and randomly distributed BoRs cluster
CN217133387U (en) Security check equipment
Balick et al. The large-scale radio structure of 3C 120
JP2000214201A (en) Antenna measuring method and measuring apparatus
CN111582355A (en) Large-scale reactor fault detection method and system based on optimal broadband beam forming
CN113868852B (en) Method for rapidly acquiring near-ground propagation characteristics of electromagnetic waves in open field
Sebak et al. Multiple scattering by parallel conducting elliptic cylinders: TE case
Baranova et al. Dislocation density of the wave front with a speckle structure of the light fields
Fomalont Polarized-Brightness Distribution for 3c 20
Truskanov et al. Antenna(selected articles)
CN205316203U (en) Optics shielding system
CN116244971A (en) Method for determining installation position of antenna of wireless sensing equipment of transformer

Legal Events

Date Code Title Description
MK4A Expiration of patent term of an invention patent