narrow band signal 中文意思是什麼

narrow band signal 解釋
窄帶信號
  • narrow : adj 1 狹 窄 狹隘的 狹小的 (opp broad wide)。2 有限的 受限制的;有偏見的 氣量小的 心眼兒窄的;眼...
  • band : n 1 帶,繩;帶形物;箍;箍條;嵌條;鑲邊;鋸條; 〈pl 〉 (法官等的)寬領帶。2 束縛,羈絆;義務;...
  • signal : n 1 信號,暗號;信號器。2 動機,導火線 (for)。3 預兆,徵象。adj 1 暗號的,作信號用的。2 顯著的...
  1. From the result we get the following conclusion : for narrow - band signal, the effect of the method based on fft is best. for wide - band signal, when snr is up to certain degree ( higher than - 7db or so ), the curves of square error of modified methods are more obvious and closer to crb. for an echo composed of more than one frequency or direction, space - frequency distribution could show more direct information of frequency and direction, which is more advantaged to make precise judge and estimation for doa of echo

    從估計結果發現,對于窄帶回波信號,基於fft的方法估計性能大大優于其他方法;對于寬帶回波信號,在信噪比達到一定程度(高於約- 7db )時,補償后的幾種估計法的性能改善均比較明顯,誤差曲線越來越接近crb曲線;對于回波中存在多頻率多方位的情況,空間?頻率分布圖能提供較為直觀的頻率及方位信息,因此應用空間?頻率估計法來進行方位估計,更有利於進一步對回波的具體方位進行準確判斷和估計。
  2. At first some modification is made in conventional beam forming of frequency domain, namely to estimate doa by arrays outputs on compensated spacial frequency points of echoes. then the cwt is utilized to signal processing in space - frequency domain for estimation of doa, and the corresponding modification is also made. in the dissertation, the computer simulations of doa estimation for both narrow - band and wide - band echoes are given, so do the necessary comparison among several methods and crb

    首先在傳統的頻域波束形成演算法的基礎上,提出對寬帶信號的頻率補償,也即對寬帶回波信號的各空間頻率根據時間頻率的差異進行相應補償,然後對各陣元輸出求和來得到方位估計;其次將連續小波變換引入到空間?頻率處理中,從而完成對目標方位的估計,並進行了相應地補償。
  3. A novel communication receiver which uses lapped transform ( lt ) incorporating modified median filter ( mmf ) algorithm is designed for narrow - band interference excision. the lt domain mmf algorithm takes full advantages of the direct sequence spread spectrum signal, as well as the characteristics of lt, performing the transform domain filtering twice. the first filtering locates the position of interference and mitigates most of them. the second filtering is performed in a small neighborhood of the located interference. so lt domain mmf algorithm can completely mitigate the interference without distorting the desired signal. simulation results demonstrate the improved ber performance and increased robustness of our receiver

    本文採用改進的重疊變換域中值濾波演算法進行變換域抗干擾處理.該演算法既考慮到直接序列擴頻信號的特點,同時又利用重疊變換的特性對變換域系數進行了二次濾波.該演算法節省處理時間,並且不需要有關干擾的先驗知識,系統性能不會隨干擾頻率變化而變化,因而是一種很穩健的處理方法
  4. First, this paper research and analyze the feature of signal of pulse doppler radar, and the mathematic model of radar is constructed. the several interference methods that narrow - band suppressing interference, range deception interference and velocity deception interference are discussed. and interference ability is evaluated and simulated

    研究和分析脈沖多普勒雷達信號特徵,建立了該種雷達的數學模型,並討論對脈沖多普勒雷達的窄帶噪聲壓制式干擾、距離欺騙干擾、速度欺騙干擾等幾種干擾樣式,並進行干擾性能評估和模擬研究。
  5. Frequency response, quantization noise, reconstruction error and its sensitivity to mismatch among adcs are studied at length in prqmf banks adc system, and the theoretic results include : ( 1 ) the distortion / aliasing functions of hybrid filter banks adc system is similar with that of switch capacitor filter banks adc system ; ( 2 ) for wide or narrow band input signal, the effective resolution of the two adc systems is 0. 51og2m bits higher than their adc ; ( 3 ) reconstruction error ' s sensitivity to mismatch among adcs of the two adc systems is reduced effectively than time interleaved adc system

    2對prqmf濾波器組adc系統的頻響、量化噪聲特性、重建誤差特性以及重建誤差對adc間的失配敏感性進行了理論分析研究,所得到的理論結果為: ( 1 )混合濾波器組adc系統與開關電容濾波器組adc系統的失真/混迭函數一致; ( 2 )無論輸入寬帶還是窄帶信號,這兩種adc系統的有效解析度均比其adc提高了0 . 5log _ 2m比特; ( 3 )這兩種adc系統的重建誤差對其adc間的失配敏感性均明顯低於時間交織adc系統。
  6. Higher capabilities were put forward for detection, identification and anti - interference of torpedo in future naval battle. compared with the narrow - band processing, wide - band processing is a new direction for underwater signal processing for its advantages including abundant information of wide - band echo and little correlation of reverberation

    未來海戰對魚雷在探測目標、識別目標和反對抗能力方面提出了更高的要求,而寬頻帶回波信號具有攜帶目標信息量大,混響背景相關性弱,利於檢測、識別目標等優點,因此自導系統發展的方向是寬頻帶自導。
  7. The targets " time serial is provided by radar ' s narrow - band signal. from analyzing the characteristic of rcs time serial, we can judge the targets " gesture by adopting run - test algorithm which is from nonparametric statistic theory

    雷達窄帶測量可以提供目標rcs時間序列信息,通過分析rcs時間序列,應用非參數統計理論中的遊程檢驗演算法可以實現目標的姿態進行判斷。
  8. Since the spectrum of the helicopter noise contains wide band continuous component and narrow band line component, we can use the wide band signal detection method or narrow band signal detection method. both detection methods are discussed

    直升機噪聲既含有寬帶連續譜成分,又有很強的窄帶線譜分量。根據直升機噪聲的特點,我們既可以採用寬帶能量檢測,又可以採用窄帶線譜來檢測直升機信號。
  9. This dissertation is mainly concerned about the radiation of the tem - horn arrays which radiate uwb ( ultra wideband ) pulse, it mainly involves three parts : theory, numerical stimulation and experiment. the uwb antenna is a new research field in the world which has many differences from nb ( narrow band ) antenna. the most difference is that the uwb antenna such as tem - horn radiates nanosecond pulse which has wide frequency spectrum, but the nb antenna radiates single frequency signal

    超寬帶天線是一項新興的研究領域,它與窄帶天線有很多不同之處,最根本的不同在於:超寬帶天線例如tem喇叭天線是輻射納秒級短脈沖信號,這種脈沖信號有很寬的頻譜;而窄帶天線大都是輻射單一頻率時諧信號的。
  10. 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
  11. On the basis of the former research works, we present the detecting method as follows : for the narrow band characteristic of the track signal we use under - sampling instead of nyquist sampling to reduce the sampling rate. as to the carrier frequency, the spectrum of the 18 - information frequency - shift track signal has two peaks, then the carrier frequency is the average of the two peak frequency, to um - 71 jointless track signal, it has only one peak, then the carrier frequency is the peak frequency

    針對移頻軌道信號的窄帶特性提出了使用欠采樣技術代替奈奎斯特采樣的方法,以降低信號的采樣頻率;國產18信息移頻軌道信號頻譜具有雙峰,雙峰頻率平均值就是信號的載頻頻率,而um - 71無絕緣軌道信號頻譜單峰,峰值頻率即為信號的載頻頻率。
  12. The technology of very low bit rate for hf ( high frequency ) communication means that, one technology of ecm ( electronic counter measures ) resistant communication is developed for low bit data message exchange in the time of battle which data communication is destroyed by electronic disturber. it is regarded by armies in the battle of information, because that it can overcome the very low snr ( signal noise ratio ), very high narrow - band interference and multipath with maxium delay of fifty millisecond

    短波最低限度通信技術是在戰時強電磁干擾情況下能實現保證最低限度的數據報通信的一種抗干擾通信技術。由於其能有效的克服極低信噪比、較強的窄帶干擾和幾十毫秒的多徑,在信息戰中受到各軍高度重視。
  13. The fir filter supplies a possible clean signal for further processing. 4. by processing the sampled signal including contain noise and partial discharge signal, narrow band period signals are filtered, but some period impulse signals ca n ' t effectively be suppressed

    4 )通過對局部放電信號的預處理,窄帶的周期性干擾信號被濾除,但是一些周期性的脈沖信號由於帶寬較寬未能得到有效抑制。
  14. The hardware design includes pl2101 power line node, realization of narrow - band interferences in direct sequence spread spectrum signal using frequency - domain algorithm

    其中硬體設計包括pl2101電力線節點、窄帶干擾自適應抑制系統的實現。
  15. In the highly crowded hf band, available continuous bandwidth is very narrow, this threaten the viability of hf radar based on the continuous spectra signal system seriously

    在擁擠的高頻頻段,可用的連續帶寬比較窄,基於連續譜信號體制的高頻雷達的生存能力受到嚴重威脅。
  16. Because of the good sensibility, ultrasonic narrow band signal analysis technique with 1mhz central frequency was chosen to differentiate the heat treatment samples above - mentioned. there are obvious differences among heat treatment products in principal frequency, spectral peak ' s quantity, amplitude and distribution. that is to say, the technique of ultrasonic narrow band power spectral can be applied to characterize the microstructures of multi - phased alloy steels

    利用窄帶信號頻譜分析技術靈敏度高的突出優點,選取中心頻率為1mhz的窄帶超聲信號,對上述不同熱處理試樣進行超聲功率譜分析,發現不同熱處理產物在功率譜主頻率、譜峰特徵(幅度、數量、分佈)等方面,都存在不同程度的差異。
  17. Based on multirate digital signal processing, this paper development a new method to design the narrow band fir digital filter, which makes the design of narrow band fir digital filters possible

    本文另闢它徑,採用多抽樣率結構來設計窄帶fir濾波器,使窄帶fir濾波器的設計由不可能變為可能。
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