In ultrasonic inspection of butt weld s, interfering echoes, such as corner echo, hill-shaped echo, etc.

在對(duì)接焊縫超聲波探傷中人人操人人操人人人干，熒屏上常會(huì)出現(xiàn)一些影響缺陷判別的干擾回波一级a性色生活片毛片裸体美女，如焊角回波第一视频欧美福利在线、"山形回波"等影音先锋在线网站。

Especially, the technology of Automatic Gain Control and signal processing are studied which are key factors working on the performance of the receiver. Based on analyzing the theory of automatic Gain Control, operational amplifiers 0P37 and logarithmic D/Aconverter AD7111A are used to design variable gain amplifiers which can be controlled numerally, A/D convector LTC1405 is Used to test the echo, Complex Programmable Logic device is used for controller, and an arithmetic is designed for automatic Gain Control which is simulated and analyzed in order to test its feasibility.

本文在分析自動(dòng)增益控制AGC原理的基礎(chǔ)上国内自拍日韩高清视频在线，采用集成運(yùn)放OP37和數(shù)控增益衰減器AD7111A設(shè)計(jì)可數(shù)字控制的可變?cè)鲆孢\(yùn)放模塊；采用高速A／D轉(zhuǎn)換器LTC1405作為回波信號(hào)檢測(cè)模塊日本一区二区黄色；采用復(fù)雜可編程邏輯器件CPLD作為核心控制模塊9999热，構(gòu)成數(shù)字自動(dòng)增益控制電路，并設(shè)計(jì)粗調(diào)和細(xì)調(diào)步進(jìn)控制相結(jié)合的算法五月丁香综合在线视频，對(duì)回波信號(hào)的增益進(jìn)行精確而快速的調(diào)節(jié)控制日韩伦理片精品视频网站免费，使回波信號(hào)振幅快速穩(wěn)定在設(shè)計(jì)指標(biāo)范圍內(nèi)，利于接收機(jī)后續(xù)信號(hào)處理電路對(duì)回波信號(hào)作進(jìn)一步的處理黄色视频在线免费看链接。

In the precision detection of a millimeter wave, the encounter of the detector and the objects can not be forecasted totally because of a lot of noise and disturbance existing in the complex battlefield, it will cause fantasticality and distortion of the echo retaked by the detector, and the stably of the echo become bad, as a result, it will reflect the result of the detection, so it is necessary to filter the echo retaked by detector.

在彈載毫米波精確探測(cè)系統(tǒng)中免费日本黄色，由于復(fù)雜多變的戰(zhàn)場(chǎng)環(huán)境中存在大量的干擾及噪聲，探測(cè)器與目標(biāo)的交會(huì)姿態(tài)不能完全預(yù)測(cè)黄色网站三国产，造成探測(cè)器獲取目標(biāo)回波產(chǎn)生奇異和變形欧美久久性爱小视频，回波特征的穩(wěn)定性變差，從而影響了目標(biāo)的探測(cè)和識(shí)別在线观看国产更新视频播放器，因此對(duì)探測(cè)器的回波進(jìn)行有效的濾波處理是十分必要的亚洲图片无码一区二区最新。

In accordance with the generating principle of line echo and after analyzing main echo cancellation algorithms, and after in-depth study on the core algorithms of all the module of adaptive echo canceller, in particular, adaptive filtering algorithm and double talk detection algorithm, considering with complexities and capabilities of all the candidates, this paper chooses NLMS algorithm to implement echo canceller.

首先亚洲黄色第一页，對(duì)回波產(chǎn)生原理和目前幾種常用回波消除算法進(jìn)行了分析，在研究自適應(yīng)回波消除器的各個(gè)模塊按摩深夜A级毛片视频免费，特別是深入分析各種自適應(yīng)濾波算法和雙講檢測(cè)算法亚洲九九av，綜合考慮各種算法的運(yùn)算復(fù)雜度和性能的情況下，這里采用NLMS算法實(shí)現(xiàn)白適應(yīng)回波消除器黄色丝袜a片。

D False images caused by side lobe, multiple reflection images, and secondary reflection images

雨雪回波脈沖的旁瓣回波国产最新色图亚洲欧美p，多次反射回波，二次反射回波草草黄色影院。

The result shows that the severe convective storm was based on the favourable large scale weather background,complex orography triggered the origin of single cell which was developed to severe storm made up of multiple cells causing hail and severe wind,characteristics of radar echo was evident.

結(jié)果表明av在线免费观看不卡一区，此次強(qiáng)對(duì)流天氣過程是在有利的大尺度天氣形勢(shì)背景下，由復(fù)雜地形觸發(fā)出初始單體并發(fā)展為多單體強(qiáng)風(fēng)暴產(chǎn)生冰雹和大風(fēng)天氣欧美七区视频在线观看，雷達(dá)回波特征明顯免费一级a毛片,在线播放视频。風(fēng)暴回波強(qiáng)度強(qiáng)，回波結(jié)構(gòu)緊密日韩网站精品导航在线播放免费观看，頂部有旁瓣假回波国产大学生私拍视频在线，低層存在弱回波區(qū)，環(huán)境風(fēng)的垂直切變較強(qiáng)中国特黄二区三区久久久久一级強奸毛片。

In this chapter, three kinds of target recognition methods are performed, which are:①Target recognition method based on the description of polarization parameter plane. The echo polarization states of target are projected onto the polarization state plane described by the ellipticity ε and the tilt angle τ of the polarization ellipse, the change of parameter following ferquency becomes the chart. According to the changing trait of the chart, the multidimensional polarization feature space of target has been contructed. Furthermore, a series of polarization feature parameters used in designing the structure of target recognition device are extracted, and they are insensible to the posture of target.②Target recognition method based on the description of Poincare polarization sphere. The echo polarization states of target expressed by Stokes vector are projected onto the Poincare polarization sphere. The conception of polarization ferquency stability, which is used in describing the dynamic distribution characteristics of the target echo polarization states on Poincare polarization sphere, has been defined. A group of polarization feature parameters used in designing the structure of target recognition device are extracted, and they are insensible to the posture of target.③Target recognition method based on the description of frequency sensitivity. In accordance with the conception of the polarization state distance defined on Poincare polarization sphere, the frequency sensibility of the physical structure property of target has been investigated, the frequency distribution feature curves in PSD domain are obtained, and targets'features are extracted by means of the curve-fitting method with Least Square Criterion.

這章具體研究了基于三種極化散射特性描述的相應(yīng)的目標(biāo)識(shí)別方法：①基于極化參數(shù)平面描述的目標(biāo)識(shí)別方法欧美大胆丰满熟妇XXBB，將目標(biāo)回波極化狀態(tài)投影到以極化橢圓參數(shù)，即橢圓率角ε和傾角τ表征的極化狀態(tài)平面上wwwxx在线，參數(shù)隨觀測(cè)頻率的變化就形成了圖污网站黄色，根據(jù)圖的變化特點(diǎn)構(gòu)造了目標(biāo)的多維極化特征空間，并提取了不敏感目標(biāo)姿態(tài)變化的極化特征參數(shù)組來設(shè)計(jì)目標(biāo)的識(shí)別器結(jié)構(gòu)精品阿v999视频在线观看；②基于Poincare極化球面描述的目標(biāo)識(shí)別方法A级免费黄片，采用Stokes矢量表征目標(biāo)回波的極化狀態(tài)，并將其投影到描述極化狀態(tài)的Poincare極化球面上国产黄色网站播放，定義了極化頻率穩(wěn)定度的概念用以刻畫目標(biāo)回波極化狀態(tài)在Poincare極化球面上的動(dòng)態(tài)分布信息亚洲精品国产精品999，提取了準(zhǔn)方位不變性的目標(biāo)極化特征，最后設(shè)計(jì)了目標(biāo)的識(shí)別器結(jié)構(gòu)在线播放欧洲免费人成视频；③基于頻率敏感性描述的目標(biāo)識(shí)別方法国产迷姦播放在线观看的，通過在Poincare極化球面上所定義的極化狀態(tài)距離的概念，研究的是復(fù)雜目標(biāo)物理結(jié)構(gòu)特性對(duì)探測(cè)信號(hào)頻率的敏感程度問題亚洲无码国产操逼视频91，獲得了在極化狀態(tài)距離下的頻率分布特性曲線黄色长成年视频在线看，采用最小二乘估計(jì)曲線擬合方法，它既用于極化特征的降維尹人香蕉，同時(shí)又直接將擬合參數(shù)作為目標(biāo)的分類特征变态另类a深喉在线视频播放。

These appearances including V-style rabbet, advent of bounded weak echo region, stronger wind vertical shear and phenomenon of airflow convergence in radar precipitation echoes were all typical characteristics of strong convective weather echoes.

雷達(dá)回波上的"V"形槽口自慰一区在线、有界弱回波的出現(xiàn)欧美三级全黄牲交视频、較強(qiáng)的垂直風(fēng)切變以及氣流輻合現(xiàn)象97seSe视频，均為強(qiáng)對(duì)流天氣回波的典型特征。

Careful analysis on NBE can facilitate nowcasting of severe weather events and further understanding of their evolution. After detailed study on three cases concerning with NBE, it is concluded:(1) NBE triggered by fast moving echo in upstream is an important indication of disastrous wind;(2) NBE can develop into severe storm under proper conditions. There are often two stages during this kind of growing: the first is developing of initial echo, the second is snap growing of echo core;(3) Doppler radar reflects outflow of downburst as a nearly ringed NBE. Inside look on downburst can be obtained combining NBE with other data.

文章結(jié)合發(fā)生在上海的3次強(qiáng)對(duì)流天氣個(gè)例可以免费看黄色视频的视频的视频，詳細(xì)分析了弱窄帶回波在分析和預(yù)報(bào)強(qiáng)對(duì)流天氣中的作用亚洲激情综合网，得出以下結(jié)論：（1）上游移動(dòng)強(qiáng)回波的出流邊界導(dǎo)致的弱窄帶回波是大風(fēng)預(yù)警的重要判斷參考；（2）在合適的層結(jié)狀態(tài)和抬升條件下男女內交网站在线观看，弱窄帶回波會(huì)強(qiáng)烈發(fā)展少妇乱淫特黄A片，并導(dǎo)致局地雷雨大風(fēng)，這類強(qiáng)對(duì)流天氣的發(fā)展有兩個(gè)比較重要的階段：弱窄帶回波上初始回波的發(fā)展和回波躍增深夜福利爱爱视频；（3）下?lián)舯┝髟斐傻牡孛娉隽髟诶走_(dá)回波上表現(xiàn)為近似圓弧的弱窄帶回波成熟女人牲交片免费，這種弱窄帶回波與其他雷達(dá)觀測(cè)特征以及地面觀測(cè)相結(jié)合，有助于對(duì)產(chǎn)生下?lián)舯┝鞯膶?duì)流云的發(fā)生發(fā)展過程進(jìn)行細(xì)致分析黄色操屄。

However, the latter more complicated, contrasted between radar data and routine observatory data. It can be seen that the classification of the storm rainfall echo according to 850hPa effective system is more ideal, the storm rainfall echo is classified into storm rainfall of trough and storm rainfall of shear line, while storm rainfall of shear line includes storm rainfall of warm shear line and storm rainfall of cold shear line, and their radar echo features are investigated. It is shown that different storm rainfall style is distinct clearly on the echo structure and feature.

而伴有低空急流暴雨的回波特征較復(fù)雜美女艹网站免费，通過對(duì)雷達(dá)資料及常規(guī)觀測(cè)資料的對(duì)比分析，發(fā)現(xiàn)利用850hPa的影響系統(tǒng)對(duì)暴雨回波分類比較理想日韩亚洲欧美，將暴雨過程分成低槽暴雨和切變線暴雨回波兩類欧美pAAAA片，切變線暴雨又可以分為冷式切變線暴雨和暖式切變線暴雨，分別分析99riAV欧美gif、研究了不同類型暴雨的多普勒天氣雷達(dá)回波特征人人在线人人操，結(jié)果表明不同類型暴雨的回波結(jié)構(gòu)和特征具有明顯的區(qū)別。

Echo Canceler：回波抵消

回波抵消:Echo Cancellation | 回波抵消:Echo Canceler | 回波強(qiáng)度:echo intensity

back echo：后瓣回波,后回波

back eccentric wheel 倒行偏心輪 | back echo 后瓣回波,后回波 | back echo reflection 障礙物回波反射

back echo：后波瓣接收的回波信號(hào);后辯回波

交流聲,干擾,背景 back drop | 后波瓣接收的回波信號(hào);后辯回波 back echo | 出氣邊,后緣,下降邊;[脈沖]后沿 back edge

back echo reflection：障礙物回波反射

back echo 后瓣回波,后回波 | back echo reflection 障礙物回波反射 | back edge 葉片出汽邊,后沿,下降邊

echo-location：回波位置;回波定位

回波包絡(luò)線 echo envelope | 回波位置;回波定位 echo location | 回音計(jì);回音測(cè)試器 echo meter

echo-location：回波定位

echo canceller 回波抵消器 | echo location 回波定位 | echo-splitting radar 回波分裂雷達(dá)

echo eliminator：回波消除器

echo channel 回聲波道 | echo eliminator 回波消除器 | echoencephalograph 腦回波圖儀,回波腦造影儀

echo, near-by：鄰近回波,鄰近回聲

近程回波,近回波 echo, near | 鄰近回波,鄰近回聲 echo, near-by | (脈波雷達(dá))遮蔽效應(yīng) eclipsing

spurious echo：楔內(nèi)回波

grass 草狀回波 林狀回波 | spurious echo 楔內(nèi)回波 | flaw echo 缺陷回波 缺陷反射波 傷波

ultrasonic echogram：超聲波回波描記圖,超聲回波圖

ultrasonic echo-impulse digital thickness meter ==> 超聲回波脈沖數(shù)字式測(cè)厚儀 | ultrasonic echogram ==> 超聲波回波描記圖,超聲回波圖 | ultrasonic echosounding device ==> 超聲測(cè)深裝置