脈沖回波計 的英文怎麼說
中文拼音 [màichōnghuíbōjì]
脈沖回波計
英文
pulse echo meter-
In this paper, wavelet neural network is used to extract the signal feature of three millimeter pulsed radar, and the simulation is done by the computer
本文將小波神經網路用於三毫米脈沖體制雷達回波信號特徵的提取並做了計算機模擬。7. in chapter 8, a new method for estimating the doppler and multipath time delay of the overlapping echoes for lfm pulse radar by only one period pulse signal is presented
7 .在第八章提出了一種對lfm脈沖雷達回波d叩pler頻移和多徑時延進行聯合估計的方法。The conventional sphere model of earth and circle model of orbit are discarded, and the ellipsoid model and the ellipse model are selected for further research, which achieves a method to determine the target position through the antenna pointing direction. and the spaceborne sar system design and simulation software is brought forth. this software accomplishes sar system coefficients design for antenna area, pulse repetition frequency, signal bandwidth, downlink data rate, radar transmitter power and satellite platform yaw steering
本文從星載雷達的星地幾何關系入手，舍棄傳統星載合成孔徑雷達研究中的球地球模型和圓軌道模型，研究了在地球橢球模型和橢圓軌道模型下由雷達天線確定目標坐標的方法，並在此基礎上研製了星載合成孔徑雷達系統設計與模擬軟體，完成雷達系統天線尺寸、脈沖重復頻率、信號帶寬、雷達信號數據率、雷達發射功率、衛星平臺的偏航牽引等幾個方面的系統參數設計以及雷達多普勒特性、雷達系統模糊、雷達定位及精度的分析，最後完成雷達回波信號的模擬。In principle, ultrasonic sensors are suspended over a road, which keep emitting pulse signals periodically to nearby and feed back waves to decide existence of any obstacles, thus to detect the speed, height, length, different sizes ( heavy, medium and small ) of moving vehicles and accumulative flow as well as length of motorcade. optionally, it can be applied to multitude driving lanes simultaneously for traffic data. by integrating and analyzing these measured data, the necessary figures concerning traffic flow may be obtained, which are fundamental basis guiding road buildings
本課題設計的是一種懸掛式超聲波車流多信息檢測器，通過懸掛于路面上方的超聲波探頭向路面周期性地發射脈沖信號，利用地面回波來判斷遮擋物地存在，可用於檢測行駛中的機動車車速、車高、車長、大中小分型以及累計車流量、車隊長度等信息，並可用於多個車道車流信息的同時檢測，綜合這些測量參數可獲得車流量的必要數據，可為公路建設提供必要的基礎依據。The paper includes four sections followed here : the first section studies the modeling of signals of pulse doppler radar seeker, and establishes a radar signal simulation model, including radar emitting signal model, receiving signal model, receiving echo signal model, clutter model, noise model, sum channel directional pattern of antenna model, difference channel directional pattern of antenna model, sheltering model, rcs model, glint noise model, etc. the second section studies signal processing of pulse doppler radar seeker, and establishes radar signal processing mathematical model and data processing mathematical model for simulation, including windowing, doppler filtering, envelope demodulation, pdi, cfar, centering, velocity tracking, angle tracking, a - b filtering, etc. the third section studies the modeling of modified proportion guiding, and establishes guiding model, then dynamic simulation results is provided
論文的主要工作包括四部分：第一部分研究了脈沖多普勒雷達導引頭的信號建模問題，建立了雷達信號模型，主要包括：發射信號模型、接收信號模型、目標回波信號模型、雜波模型、噪聲模型、和差通道天線方向圖模型、遮擋因子模型、接收機噪聲模型、目標雷達截面積統計性模型、目標角閃爍模型等。第二部分研究了脈沖多普勒雷達導引頭的信號處理模式，建立了信號和數據處理模型，主要包括：加窗和多普勒濾波、包絡檢波、檢波后積累、頻域cfar處理、速度定心、速度跟蹤、角跟蹤、 ?濾波等，然後給出了信號處理流程。This thesis discusses the pulse doppler ( pd ) weather radar signal processing system including digital intermediate frequency ( if ) receiver, especially on the application of if sampling and digital demodulation technique in pd weather radar signal processing system, the influence of amplitude and phase unbalances of in - phase and quadrature channels on weather radar echo spectrum estimation, ground clutters elimination algorithms and a typical engineering realization scheme of pd weather radar signal processing system
本論文研究的是採用數字中頻接收技術的脈沖多普勒氣象雷達信號處理系統，重點研究了中頻采樣及數字解調技術在脈沖多普勒氣象雷達信號處理系統中的應用、正交雙通道幅相不平衡對氣象回波譜估計的影響、地雜波濾波演算法，以及脈沖多普勒氣象雷達信號處理系統的具體工程實現。On the design of the system, the thickness measure system of mems chip is built based on lbu and pump - probe technology. on the analysis of data, the reflectivity curve is analyzed using the law of reflectivity change induced by ultrasound, and the thickness is calculated using the system designed by the article, to aluminum film the size of about 20nm can be measured, when the film be measured is single layer, the relative error of the system is less than 2 %, when the film be measured is double layer, the relative error of the system is less than 10 %
在基礎理論方面研究了激光（特別是超短脈沖激光）超聲的激勵機理，探討了激光調制技術以提高系統信噪比，闡述了泵束探針束技術及相關實驗設置；在系統設計上，以激光超聲為基本原理，以泵束探針束技術為系統設計方案完成了mems基片厚度測量系統的設計；在數據分析方法上，利用聲致光反射率變化的一般規律對測得的光反射率曲線進行分析，確定超聲回波在薄膜兩界面間來回傳播的時間，以計算薄膜的厚度。The reflected wave will be received by the receive antenna and transferred to digital data. we can analyze the data that saved by the computer of gpr to deduce the medium ' s property, situation, location and so on. being a kind of nondestructive, untouched method, it has many advantages such as nondestructive, rapidness, simpleness and high precision, so it will have wide applications in the ways of examination, control and maintenance to road quality, especially for highway
路用探地雷達是近幾年發展起來的、應用於公路無損檢測的一項新技術，它利用超寬帶脈沖電磁波對路面結構層進行探測，當雷達發射天線發射的電磁波在路面結構層中傳播時會在介電特性突變處產生反射和透射，反射回來的波經由接收天線接收並轉化為數字信號儲存起來，通過分析探地雷達回波信號來估計路面結構層的性質、狀態和位置等特徵。The second part brings forward a new ar - model - based arm detection method based on features of arm and characteristics of velocity and acceleration of the radar echoes. by establishing two - order ar models, this new detection method computes the poles of models representing different targets, thus estimates the acceleration of the targets so as to determine the nature of the targets. furthermore, this method can not only be applied when the arm is being tracked by radar, but also be put into use in radar ’ s seeking and scanning times
第二部分則是根據反輻射導彈（ arm ）的特點及其雷達回波信號中速度、加速度等特徵，提出了一種新的基於ar模型的arm檢測演算法，該方法通過建立二階ar模型、估計代表不同目標的模型極點，並由此估算目標加速度來判斷目標性質，該方法不僅可以在雷達已跟蹤上arm后採用，而且適用於雷達搜索掃描時使用，模擬結果表明該方法具有解析度高，對雷達脈沖重復頻率（ pulserepetitionfrequency ， prf ）及積累脈沖數要求不高的特點，在低的prf及少的積累脈沖下，利用該方法仍可有效地識別檢測arm 。A high - speed sampling system for echo signal of impulse gpr based on equivalent time sampling method is presented, and significant circuits including step sampling pulse generator and sampling gate circuit are designed
摘要提出了一種基於等效時間采樣方法的沖擊型探地雷達回波信號高速采樣系統，設計實現了等效時間采樣的關鍵電路，包括步進采樣脈沖發生器、采樣門電路。Dsp56f805 samples the ultrasonic pulse coming back from the target, then measures the distance and shows it on led. tms320vc5509a is accomplished the detecting speed and the main control of the radar system, is 16 fixed dsp with high performance and low power produced by ti company. dsp5509a samples the wave coming from t / r module, then measures the target ’ s speed and send this information to the assistant control chip - p89v51 based on boost c51 core mcs produced by philips company, which controls the lcd
測距雷達系統的控制和信號處理的核心晶元是motorola公司的dsp型16位單片機56f805 ，由它對超聲波回波脈沖進行ad采樣后，計算目標距離並在七段數碼管上顯示。測速雷達系統中信號處理的核心晶元是ti公司的超低功耗、高性能的16位定點dsp ? ? tms320vc5509a ，由它對收發組件輸出的多普勒回波進行采樣，計算出目標運動速度后，送給輔助控制晶元? ?飛利浦公司生產的基於c51內核的增強型單片機p89v51 ，並且在液晶顯示器上顯示速度信息。So it is essential to diminish the errors and enhance its anti - jamming ability. an innovative method of measuring pipeline thickness based on power spectral evaluation computing has been put forward. besides, experiments on the on - line measurement have yielded good results, proving the veracity and reliability of the measurement
介紹了為減小系統的測量誤差、提高系統抗干擾能力而進行的對超聲波回波信號的分析研究工作，創新地提出了一種基於對超聲脈沖多次反射回波功率譜估計的超聲測厚方法，並通過實驗證明了該方法用於在線檢測的準確性與可靠性。It commences from review of the theory of sar high resolution in the text, the fundaments and computation procedures of two algorithms for sar raw signal generation ? ? rtpc, 2dfft are introduced
文中從回顧sar高分辨原理入手，介紹了距離時域脈沖相干法和二維頻域快速傅氏變換法這兩種回波信號生成演算法的基本原理和計算步驟。To solve this problem, quick range measurement technology was researched based on the method of propagation delay and working principle of cpld. a time measurement circuit with an accuracy of ? 0. 2m was designed and accomplished. it could finish the whole measurement process in 80ns after the bounced pulse was received
針對該問題，基於傳遞延時插入法和cpld的工作原理，對快速測距技術進行了研究，研製了一種能實現收到回波脈沖后80ns內完成測距，測距精度0 . 2m的計時電路，並將該電路集成於一片可編程邏輯器件中，減小了電路面積和功耗，增強了抗干擾能力。分享友人