跟蹤帶寬 的英文怎麼說
中文拼音 [gēnzōngdàikuān]
跟蹤帶寬
英文
tracking bandwidth-
The signal format of gps is analyzed, the principle models and mathematical models are established, the ber performance is analyzed in a channel interfered with wide - bandwidth awgn, narrow - bandwidth awgn, transmitted signal, single - tone signal respectively. based on the results above interference methods are discussed and simulated. then the performance of code acquisition and code trace of a digital gps receiver are discussed. the modem of linkl 1 and link4a are modeled and their ber performances are analyzed and simulated in channel s interfered with awgn, single - tone signal and multi - tone signal respectively
建立了jtids的收發終端的數學模型，分析它在噪聲干擾、相關干擾、互相關干擾下的誤碼性能，提出較佳的干擾方法和干擾碼型，並進行模擬模擬；分析了gps的信號格式，建立了gps的原理框圖模型、信號數學模型，並對其在寬帶噪聲干擾、窄帶噪聲干擾、轉發干擾、單頻干擾等情形下的誤碼性能進行了分析比較，提出相對較佳的干擾方法，並做了計算機模擬，針對一數字式gps接收機中擴頻碼捕獲與跟蹤環的特性進行分析；建立了link11和link4a數據鏈調制解調數學模型，對它們在噪聲干擾、單音干擾、多音干擾等下的誤碼性能進行分析，最後對干擾情況進行了模擬模擬。By making full use of favourable narrow - band tracing filter character of pll and by combining the merits of dds such as super fine frequency resolution 、 high frequency accuracy 、 very fast frequency hoping with it, the pll / pll + dds frequency synthesizer presents wide band high quality source and super small frequency hoping step. while the electronically tuned filter abates the image interference and notably improves the selectivity. the theorem of frequency synthesizer and center - frequency - fixed filter is simply but adequately introduced first in this paper
課題中所採用的pll或dds pll鎖相頻率合成方法充分發揮鎖相環良好的窄帶跟蹤濾波特性，並結合dds的高頻率解析度、高頻率精確度和高速頻率捷變等優點，分別實現了系統所要求的高質量寬帶本振源和小步長頻率捷變；採用電調諧選頻技術，則大大改善了接收機的選擇性和抗干擾能力。Based on research and experiments, we effectively improved the s - band tt & c transponder for satellite in such dimensions : with sensitivity up to - 92dbm ; dynamic range wider than 55db ; capture bandwidth of the receiver wider than 500khz ; capture time reduced to 22ms
通過論文工作，成功地改進了川于衛星的s波段測控通信一體機，跟蹤和捕獲接收靈敏度都能達到一92dbm ，動態范圍55db以上，接收機的捕捉帶寬大於500khz ，捕捉時問減小到22ms 。The laser acquisition, pointing and tracking ( apt ) technology of high precision and large band - width is the key technology of space laser communication
高精度、寬帶寬的激光捕獲、對準和跟蹤技術（簡稱apt ）是空間激光通信的一個關鍵技術。The future wireless mobile communication systems are expected to provide ubiquitous, high - quality, and high - rate mobile multimedia transmission. however, hostile multipath fading radio conditions give rise to serious inter - symbol interference ( isi ) ; even worse, wireless channel are often time varying, which makes the system more vulnerable and more difficult to track the channel state. orthogonal frequency dvision multiplexing ( ofdm ), which is inherently resistant against isi, has invoked a popular research interest in recent years, and has been a promising candidate technology of the physical layer for future weideband high - date - rate wireless communications. notwithstanding, ofdm is much more vulnerable to errors of both time and frequency synchronization and to that of channel estimation, and how to obtain correct timing and channel estimation efficiently is highly critical to ofdm systems. the dissertation will focus on both of the aspects of ofdm systems mentioned above
但是無線環境的多徑特性造成通信系統中嚴重的符號間干擾，同時無線通道的時變性使得通道特性跟蹤復雜。而正交頻分復用技術（ orthogonalfrequencydivisionmultiplexing ， ofdm ）正是一種解決符號間干擾的有效傳輸手段，因此ofdm技術作為未來寬帶高速率無線通信的物理層候選技術在當前引起了一股研究熱潮。但ofdm系統對定時同步誤差和通道估計誤差非常敏感，如何在ofdm系統中準確快速地實現符號同步和通道估計是至關重要的，本論文將重點針對這兩個問題進行討論。The fourth section studies the modeling of broad band blocking jamming and coherent jamming, and analyses the principal of coherent jamming and the factors of influencing the jamming effect is provided. the performance of pulse doppler radar seeker is simulated when certain jamming methods is exerted. a pulse doppler radar seeker simulation system is established, by using the simulation system the performance of pulse doppler radar seeker is evaluated when jammed
第四部分研究了寬帶阻塞式干擾和相干干擾的建模問題，並分析了相干干擾作用原理，給出了影響干擾效果的主要因素及次要因素，模擬了脈沖多普勒雷達導引頭在寬帶噪聲干擾情況下的截獲和跟蹤性能，模擬了相干干擾對脈沖多普勒雷達導引頭跟蹤性能的干擾效果。We study on using the focusing matrix of coherent subspace method ( csm ) to update the date matrix before the fast follower jammer coming, and then improved the adaptive beamformer ' s convergence. in the second one, when there are fast follower jammer and wide - band interference, we suppress them separately
另一方面，在同時存在寬帶阻塞干擾和快速跟蹤干擾時，利用兩種干擾與期望信號到達時間的不同，分兩個階段分別將其抑制，降低了干擾對系統的影響。Particular study of mean shift algorithm leads to an improvement of it : we change the bandwidth parameter h from a scalar to a vector
通過對mean - shift跟蹤演算法的詳細分析，提出了將原演算法中單一的帶寬參數改為矢量參數的改進方案。It is necessary that the receiver tracks the acquired signals steadily and credibly to ensure the successful demodulation process. in this thesis, an improved tracking loop design method is presented which adopts self - adaptation parameters and varied bandwidth tracking technique to adapt to the input signals, and improves the acquisition and tracking performance
接收機穩定可靠地跟蹤被捕獲信號保證成功解調是必要的，本文介紹一種改善的鎖相環設計方法，這種方法採用自適應參數和變帶寬跟蹤技術來調整輸入信號改善捕獲和跟蹤性能。And the parameter data and the figures have not been calculated ever. compared with the performance curves of the primary aod, the aod with the optimum design shows great capacity : at the extreme point of bragg diffration the optimized one obtain a 2. 4 times wilder relative 3db bragg bandwidth than the primary one ; and with the same relative 3db bragg bandwidth which is 0. 67, the optimized aod has a relative 2 times of the the primary aod
用圖示的方法將優化設計后的曲線與非跟蹤的曲線進行對比，在進入布拉格衍射區的臨界點處經優化設計的器件相對帶寬達到非跟蹤器件的相對帶寬的2 . 4倍;在相對帶寬? f = 0 . 67的情況下，經優化設計的器件相對長度是非跟蹤器件相對長度的2倍。Idms firewall - idms firewall - easy to use firewall configuration script, featuring statefull connection tracking, bandwidth limiting and bandwidth logging
一個易於使用，通過腳本配置的防火墻，可以對連接進行全程跟蹤，帶寬限制和帶寬日誌。分享友人