echo signals 中文意思是什麼
echo signals
解釋
回波信號-
Since the echo signals are partly received, this radar system has detected the target adopting the processing mode of blocking echo signal before and after, and the problems of the isolation between transmitter and receiver and blind range are solved
該體制雷達採用前後截斷回波信號處理方式，當接收部分回波信號后就對目標進行檢測，解決了收發隔離和盲距問題。 -
Feature extraction and classification of ground penetrating radar echo signals
探地雷達回波信號的特徵提取和分類 -
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。 -
1. stepped - frequency signals are used in echo simulation. it could generate synthetic high resolution image
1 、用步進頻率信號完成回波模擬，研究了這種信號的特點。 -
For those biological signals like echo of bat or whale, as well as man - made system signals like radar or sonar signal, the instantaneous frequency of signal component contains important information and could be used for signal model parameters extraction. so that the proper choose of transformed domain and signal characteristic extraction method is of crucial important. the ridge extraction method used for signal characterization was first proposed in the 1990s, it ' s based on the study of the phase of the wavelet ( or other linear ) transform
對于許多實際的信號，如蝙蝠發出的超聲波、鯨魚的叫聲等生物信號，以及雷達、聲吶等人造系統產生的信號而言，信號瞬時頻率的變化規律反映了信號重要的特徵，並且也是信號模型中關鍵的參數，因此選擇合適的變換域提取信號的瞬時頻率信息，並選擇合適的方法對信號進行重建是很重要的問題。 -
That is, modeling radar system with software, and then recurring the produce, transmission processing by computer. the core of res is modeling the scatter and transmission of radar echo signal and varied radar clutter signals
雷達模擬的核心是建立雷達目標回波信號及各種雜波信號散射、傳播特性的模型。雜波伴隨這雷達產生而產生，對于雷達的設計有著重要的影響。 -
Because ip telephone systems employ the packet switching technology, the echo signals generated by the hybrid due to the impedance mismatch usually experience longer transmitting delay, which significantly decrease the speech communication quality
對于ip電話系統而言，由於採用了分組交換技術，由2 / 4線轉換器阻抗不匹配而產生的回波在系統中傳輸的時延較長，這將加重回波對語音通信的影響。 -
Abstract : the threshold algorithm of the target detection is often used to detect target echo signals. its performance is based on signals - noise ratio. when signals - noise ratio is great than 6. 7, the target can be detected. in order to increase the signals - noise ratio, matching filter is often used. if the system is narrow band system, the noise is color noise and matching filter cannot be used. therefore, the signals - noise ratio cannot be increased. however, the geometrical characteristic of the laser echo signal is different with the noise. this paper advises the algorithm that detects the target by the geometrical characteristic. when signals - noise ratio is great than 2, this algorithm can detect target. this algorithm has been used in practice
文摘:目標檢測的閾值法經常用於檢測目標的回波信號.它的性能取決于信噪比，當信噪比大於6 . 7時，能夠檢測出目標.為了提高信噪比，經常採用匹配濾波器.如果系統是窄帶系統，噪聲為色噪聲，無法使用匹配濾波器，不能提高信噪比.激光回波信號的幾何特徵不同於噪聲.提出了一種利用這種幾何特徵檢測目標的演算法.當信噪比大於2時，該演算法能夠檢測出目標.該演算法已經實際應用 -
To the first one, the method of new sidelobe - suppression filter and the method of cutting big signals from the echo are put up, and the result is fine. to the second one, get the echo without earth clutters, and send it to the adaptive system as the input signal, so that the best result can be reached. finally the influence of the bad signal is given
針對旁瓣問題，提出新型旁瓣抑制濾波器方案和從回波中去除大功率信號方案，取得較好處理效果；在和相控陣處理的融合問題上，提出去除回波中地雜波的方法，為自適應處理提供較好的數據源；最後簡要分析惡劣環境對信號處理的影響。
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