時分跳頻 的英文怎麼說

中文拼音 [shífēntiàobīn]
時分跳頻 英文
tdfh time division frequency hopping
  • 時 : shí］Ⅰ名1 （比較長的一段時間）time; times; days:當時at that time; in those days; 古時 ancient tim...
  • 分 : 分Ⅰ名詞1. （成分） component 2. （職責和權利的限度） what is within one's duty or rights Ⅱ同 「份」Ⅲ動詞[書面語] （料想） judge
  • 跳 : 動詞1 （腿用力彈起） jump; leap; skip; bounce 2 （彈力使物體突然向上移動） spring; leap 3 （一起...
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  • 時分 : 時分time:黃昏時分 at dusk; at twiligh; cock-shut time
  1. And more, a computer simulation has been made and the results indicate the validity of part time - resident interference under the certain ratio of jamming - to - signal time - resident, consequently, it may provide concerned methods for countermining fh communication systems

    進一步進行了模擬與分析，結果表明在一定干信駐留時間比情況下，部分駐留時間干擾的有效性，從而為針對跳頻通信系統進行對抗提供相關方法。
  2. Intermodulation suppression for fh ( frequency hopping ) receiver is designed by selecting the intermediate frequencies and changing group of filters, local oscillation ( lo ) frequency, bandwidth of lo frequency under the condition that receiver configuration, sensitivity, dynamic range, instantaneous bandwidth and precision of frequency measurement are fixed

    摘要針對跳頻接收機的體制和靈敏度、動態范圍、瞬時工作帶寬、測頻精度等設計參數，通過改變預選器組成、本振頻率和本振帶寬，分析接收通道的中頻選取原則，以實現跳頻接收機的互調抑制設計。
  3. The synchronization of frequency hopping method referenced the jtrs radio system of usa military, and designed a synchronization method used in our radio include creating the frequency hopping map and the base band frame architecture in frequency hopping mode. the paper also analyzed the synchronization capability on theory. it has been proved correct on theory by showing the false probability, capture probability and the synchronization time

    對跳頻圖案的產生和跳頻的幀結構，本文不僅從理論上分析了同步性能，給出了虛警概率和檢測概率，估算了同步的捕獲時間，證明均能滿足系統指標要求，而且通過與合作單位進行的整機聯調和實測證實了該方案的可行性。
  4. Chapter 1 introduces the extensive application of hf / vhf communication and hf / vhf radios in military field, and points out the significance for promoting the research work of fh communication countermeasure using modern signal processing techniques, especially time - frequency analysis

    第一章介紹了短波通信和短波跳頻電臺在軍事領域中的廣泛應用，以及現代信號處理技術特別是時頻分析技術對促進跳頻通信對抗研究的重要意義。
  5. The fh signal is a kind of non - stationary signal that the frequency changes non - linearly along with the time. however, the time - frequency analysis technique is the powerful tool to deal with these signals

    跳頻信號是一種頻率隨時間非線性變化的非平穩信號，而時-頻分析是分析這類信號的有力工具。
  6. This thesis analyzed the error performance of mfsk and mpsk modulator in hf with optimal receiver, studied the shortcoming and strongpoint of several typical short - wave data transmission systems and their performance over fading and intersymbol interference channels. the theory and key technical of adaptive modem is discussed. in the last, an efficient modulation scheme - block coded modulation is introduced into hf radio systems to improve the efficiency of hf data transmission, this paper also proposes a hf data transmission system scheme composed of a block coded modulator and a decision feedback type adaptive equalizer

    本文在對短波數傳兩種常見調制方式fsk及psk最佳解調性能分析的基礎上，討論了幾種採用典型調制技術的短波數傳系統（如時頻調制、多進制頻移鍵控慢跳頻、 chess系統）原理、優缺點以及抗衰落和抗符號間干擾的性能；分析了自適應串列數傳系統抗短波通道衰落和多徑干擾的原理、關鍵技術；在本文的最後引入一種有望解決短波數傳系統低效率狀況的調制方式bcm -分組編碼調制，給出了一個採用bcm技術與自適應均衡技術相結合的短波數傳系統方案，並通過計算機模擬進行了初部驗證。
  7. ( 3 ) it proved that the factors such as technology, market, management, fund and policy environment make different impaction on the result of the valuation of the investment opportunity of hi - tech enterprise during different developmental phases. ( 4 ) the competition intensity, the time lag of investment and the riskless rate make great negative impaction on the option value of hi - tech enterprise. ( 5 ) the conclusion of analysis achieved from which the varieties of the market supply and the market demand make impaction on the result of the valuation accord with the conclusion of analysis achieved from which the varieties impact to price on economics

    本文的主要研究成果如下： （ 1 ）投資機會價值在高新技術企業價值評估中佔有重要的地位； （ 2 ）在提出的投資機會價值評估模型的基礎上，結合實際，深入探討隨機跳躍頻率下的評估結論對投資決策的影響； （ 3 ）從定性和定量兩個角度系統地說明了技術、市場、管理、資金及政策對評估結論的影響程度是隨著企業發展階段的不同而不同； （ 4 ）證明了外部競爭強度、投資的時滯和無風險利率對企業的期權價值評估產生極大的負影響，即外部競爭強度越強、投資的時滯越長和無風險利率越大，企業的期權價值就越低，反之就越高； （ 5 ）市場需求和供給的分析結果與從經濟學上的供需對產品價格的影響結論是一致的。
  8. This paper introduces the structure and basic principles of ultrashort wave frequency hopping station system, analyzes on the tod and three kinds of frequency - hopping synchronizations, and advances a scheme of deferred - network - entry synchronizationt

    介紹了超短波跳頻電臺系統結構及基本原理，分析了時間信息（ tod ）與3種跳頻同步分類，提出了一種遲入網同步方案。
  9. During the every hop span of fh communication systems, these new methods of interference can only work on a part of it

    在跳頻通信系統每跳駐留時間內，這些新的干擾方法僅能幹擾其中一小部分。
  10. Therefore, based on researching fh communication systems, the influence of part time - resident interference on fh communication ' s synchronization and its tracking has been mainly analyzed

    為此，在對跳頻通信系統研究基礎上，重點分析了部分駐留時間干擾對跳頻通信系統同步及跟蹤的影響。
  11. Construction and characteristic analysis of a frequency - hop timespread code

    一種跳頻擴時碼的構造及性能分析
  12. Construction and characteristic analysis of a frequency - hop time - spread code

    一種跳頻擴時碼的構造及性能分析
  13. For fh signals, we proposed two algorithms too, one is a signal detection algorithm based multiple - hop autocorrelation ( mhac ) of fh signals, and the other is a parameter estimation algorithm based on time - frequency analysis

    對跳頻（ fh ）信號，本文提出了基於多跳自相關的信號檢測方法和基於時頻分析的跳頻參數估計方法。
  14. Under finite precision, ways we always seek is easy to implement. and we encrypt the fh system with chaotic stream cipher. simulation results show that the security properties of fh sequence have been improved and the security of information is guaranteed even the fh patterns are broken

    大量的對比分析試驗表明，該密鑰生成器生成的混沌序列密碼的密碼學特性良好。同時，本文還努力的尋求一種在有限精度條件下混沌加密的可實現方案，並利用混沌序列密碼對跳頻系統進行加密。
  15. For the simple two states interference modle, the different improvement of bluetooth ’ s anti - jamming performance after applying afh is investigated for two instances such as parameters or active channels are different

    對于簡單雙狀態干擾模型，分析了當選擇參數不同、活動通道數目不同時，自適應跳頻技術對藍牙系統抗干擾性能提高程度的不同。
  16. This paper investigates adopting adaptive frequency hopping ( afh ) to replace fh, in order to enhance bluetooth ’ s anti - jamming performance. this paper analyzes the interference bluetooth faces on, the mechanism of bluetooth for anti - jamming, the work principle and key technology of afh firstly, which are the bases for the next investigation

    文章首先分析了藍牙和ieee802 . 11b之間互干擾的情況、藍牙本身的抗干擾機制、自適應跳頻技術的工作原理以及應用到藍牙時的關鍵技術等問題，這為後面的研究奠定了基礎。
  17. Fh signals are time - variant and non - stationary signals, while time - frequency analysis is a powerful tool to analyze this kind of signals. so how to deal with fh signals using time - frequency analysis technique is a important aspect in the research fields of fh surveillance algorithms

    由於跳頻信號的時變特性以及時頻分析技術在分析時變非平穩信號方面的強大功能，因此，如何應用時頻分析技術來處理跳頻通信信號，是目前跳頻信號偵收演算法研究領域的一大方向。
  18. High technology is applied to gsm, such as fdma, tdm a, and frequency hopping. many logical channels related to different services and the mapping of logical channels to physical channels are defined

    Gsm系統綜合運用了頻分多址（ fdma ）技術，加上時分多址（ tdma ）技術，並輔以跳頻技術。
  19. Chapter 2 introduces the theory of frequency - hopping and omsk, at the same time gives out a fh - gmsk radio model in high frequency band under the matlab simulink environment. chapter 3 respectively proposes the parameter blind estimation algorithms for high - speed - hop and low - speed - hop fh signals based on smoothed pseudo wvd ( spwvd ). furthermore, the simulation results are given to demonstrate the algorithms performance

    第三章用「平滑偽wvd （ spwvd ） 」時頻分析技術分別研究了對高速跳和低速跳的跳頻信號的參數盲估計演算法，並對這兩種演算法，分別在matlab的環境下做了模擬和性能分析。
  20. This is by two reasons : the first, as the development of military communication technologies, it transit from digital to software implementation, intelligence, broad band implementation and network implementation. many new technologies such as adaptive frequency hopping, burst communication, broadband modulation and complex coding accelerate the research about pertinence algorithms of signal sense and signal processing. the second, three hotspots of modern signal processing - spectrum estimation, high - order statistics ( hos ) and time - frequency analysis theory become more and more consummately and being used in communication jamming and anti - jamming field

    應用於軍事通信對抗的信號處理理論發展非常迅速，這得益於兩個方面的動力：其一，軍事通信的技術和手段不斷更新，在數字化的基礎上逐步走向軟體化、智能化、寬帶化和網路化，出現了自適應跳頻、突發通信、寬帶調制和復雜編碼等新的實用技術，推動了具有很強針對性的信號偵測和處理領域的演算法研究；其二，現代信號處理的三大熱點? ?譜估計、高階統計量方法、時頻分析的理論和技術日臻完善，並逐漸應用於通信對抗領域。
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