low echo 中文意思是什麼
low echo
解釋
低回波-
The specific research methods are listed : 1. matched filter taking the max ouput snr as the best rule correlates nonstop divided signal and divided echo to detect low snr target signal. then all one dimension divided correlation outs and done fft in portrait to leach interferential signal such as static or low rate mussy meaves, many pathway echo and so on and to take target ' s time difference and doppler frequency that combine parameters that target ' s direction taken from antenna and so on to implement target ' s orientation and tracking
具體研究方法如下： 1 、採用以輸出信噪比最大為準則的最佳匹配濾波器來對分段的參考和目標信號作相關處理來檢測低信噪比目標信號，然後對一維分段相關輸出組作縱向傅立葉變換來濾除靜態或低速的雜波、多徑回波等干擾信號，並提取目標的時差和多普勒頻率，再結合由天線獲得的目標方向等參數，就可以實現目標的定位和跟蹤。 -
A new wavelet - bispectrum united detection algorithm is proposed to face with problems such as the complex structure and low signal to noise ratio of radar echo, when there exist difficulties in detecting impulses in through - wall radar systems
摘要針對沖擊體制穿墻雷達系統中回波信號結構復雜、信噪比低、信號檢測困難等問題，提出一種小波雙譜聯合檢測新演算法。 -
It solves a series of problems, such that the low sensitivity, no convenience, no beauty and so on. vk2000 adopts the usb port, plug - and - play, no any drive program, which combines microphone and sound box. it combs out the network echo and yawp, with the latest technology in full duplex audio and the microphone is good adapterization from the whole direction
回聲消除技術很好地解決了傳統音頻設備易產生網路回聲，拾音靈敏度低噪音大等問題，保證了良好的雙向通話效果它將麥克風和音箱集成一體，全向拾音，免提通話，拾音距離達到 -
Within one single source echo, both doa and time - delay can be estimated simultaneously by this algorithm via high - resolution rotational invariance technique and high - resolution time - delay frequency ( tdf ) technique. the esprit - tdf algorithm has features of low computation, good precision, and high resolution both in doa and time - delay. it is suitable for multiple source exact localization
該方法利用高分辨旋轉不變技術和高分辨時延頻率技術，可在單次目標回波內實現多目標信號的方位和時延參數的高分辨聯合估計，具有運算量小、分辨能力強、估計精度高等特點，能夠對多目標進行高分辨精確定位。 -
Thirdly, this dissertation analyses the echo simulation of chirp - subpulse stepped frequency signal and chirp signal. and the detection capability of chirp - subpulse stepped frequency signal and chirp signal in low altitude moving target is compared. the results show that chirp - subpulse stepped frequency is better
再次，本文分析了chirp子脈沖頻率步進信號和chirp信號的回波模擬問題，在此基礎上，對chirp子脈沖頻率步進信號和chirp信號對低空動目標檢測的性能進行了比較，結果顯示chirp子脈沖頻率步進信號具有較好的性能。 -
Abstract : the radar echo of a helicopter rotor is modeled and analyzed theoretically at first, then a new method is proposed to detect hovering helicopter by using low - pass filter and multilevel hypothesis examination
文摘:首先對直升機旋翼的雷達回波進行建模和分析，在此基礎上提出一種懸停直升機積累檢測新方法即低通濾波和多級假設檢驗相結合的方法。 -
Abdominal sonography demonstrated a long segment intussusception associated with a low echo genic mass
腹部超音波檢查展示一長段腸套疊，併合並有一低迴音性腫瘤。 -
In the paper the methods to process weak echo by using dsp technology based on low snr of laser weak echo are presented. and the methods are simulated and calculated
摘要文章針對激光弱小回波信號的低信噪比，提出了運用數字信號處理技術對回波信號進行處理的方法，並進行了一系列模擬和計算。 -
Compared with the lsb algorithm, the robustness of this algorithm is stronger ; compared with the echo hiding algorithm, the detection watermarking of this algorithm is easier, the calculation is simpler ; compared with the time - domain algorithm based on psychoacoustic masking, the calculation complexity is relatively low, the transparency does not rely on experience value, and the embedding amount is larger
與lsb演算法相比，該演算法具有較強的健壯性;與回聲演算法相比，該演算法檢測水印容易，計算簡單;與基於心理學掩蔽模型時域演算法相比，該演算法計算簡單，透明性不依賴經驗值系數，且嵌入量大。基於振幅比較的數字音頻水印（機密信息）隱藏演算法。
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