hopping frequency 中文意思是什麼
hopping frequency
解釋
跳頻-
On the base of researching the theory of the scheme and analyzing the signal feature, it is obtained that the existence manners and character of distance information in the differential frequency signal. at the same time, a new conclusion is gained that the technology of frequency agility can decrease the constant error of system. it is also to say that frequency agility and frequency modulation fixed - distance fuze has the similar feature to random period frequency modulation fixed - distance fuze. according to the theory of address coding in the hopping - frequency communication, the paper presents the principle of selecting the frequency agility sequence which fit to the radio fuze and constructs the frequency agility sequence family based on the rs codes
在深入研究方案原理和分析信號特徵的基礎上，獲得了該體制引信差頻信號中，距離信息的存在形式和特點，得出了頻率捷變技術的引入降低了系統定距固定誤差這一新的結論，即頻率捷變調頻定距引信在定距性能上具有類似隨機周期調頻定距的特徵。本文引入跳頻通信地址編碼理論，結合無線電引信的具體特徵，提出了適用於無線電引信的頻率捷變序列的選擇原則，並構造了基於rs碼的寬間隔頻率捷變序列族。 -
Using dds to realize fast differential frequency hopping
實現高速短波差分跳頻 -
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。 -
The exploration of scout uhf frequency hopping signals scheme
超短波跳頻信號的偵察方案探討 -
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。 -
This thesis includes researches on the design of communication countermeasure federation, implementations of constant frequency and fh ( frequency hopping ) communication countermeasure federations
本文的研究內容分為三個部分:通信對抗聯邦設計、定頻通信對抗聯邦實現以及跳頻通信對抗聯邦實現。 -
With the objective of developing distributed simulation system of frequency hopping ultrashort communication countermeasure system, the federation architecture and the complex envelop simulation block diagrams of fr transmitter and receiver are presented at first
摘要以建立超短波跳頻通信對抗分散式模擬系統為目的，首先給出了聯邦的體系結構及跳頻發信機、接收機成員的復包絡模擬框圖。 -
Frequency - hopping ( fh ) is a novel spread spectrum communication technique, which develops very fast in military field due to its lpi / lpd ( low probability of intercept / detection ) properties and immunity against interferences, the extensive application of hf ( high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and brought up a new austere challenge for communication countermeasures
跳頻通信具有良好的抗干擾性，低截獲概率及組網能力，因此跳頻技術的一出現，便在軍事領域得到了極大的發展，採用跳頻技術的短波電臺在軍事通信中得到了廣泛應用，極大地提高了軍事裝備的抗截獲和抗干擾能力，向通信對抗提出了嚴峻的挑戰。 -
( c ) propose the scheme to implementing the coder and deoder of optical time - spreading / frequency - hopping, by assigning two orthogonal codes for one user and using these two codes to encoding 1 and 0 respectively, differential detection can be adopted. not only improves system performances in ber, but also resists the interference such as mai, and does n ' t need any control devices to evaluate the optimum decisive threshold
通過給每個用戶指定互相關為0的兩個地址碼分別發送1和0信號以及在接收端採用差分檢測技術，避免了ook （開關鍵控）光通信系統中0不發送光脈沖和ook常規檢測方式下最佳判決門限必須根椐用戶數等外界環境而改變，從而提高了系統性能和降低了系統的復雜度。 -
Experimental results show that embedded watermark has a certain capacity and robustness. a virtual channel technique, which is based on frequency hopping technique, is proposed in chapter 5
第五章借鑒跳頻思想提出了虛擬通道技術，並據此設計了一種在載體中嵌入灰度圖像作為水印的演算法。 -
An anti - jamming method for frequency hopping synchronization
一種跳頻同步的抗干擾方法 -
The experiment is used to show the theory of frequency hopping communication, the methods of reconnaissance and jamming for hopping frequency communication and the difference in all kinds of jamming methods
該實驗的目的是為了具體展示跳頻通信的工作原理，跳頻通信的偵察與干擾方法以及跳頻通信各種干擾方法的性能比較。 -
Lt is well anown that the multi ? ath effeet results in signal fading and intersymbol interference ( isd, wnich causes great difficulhes in pewces of transndssion in underwater acoushc cotnmnication. in this papef we used frequency diversity method to overcome the problem of signal fading, and used the frequency - hopping method to ebonate the isi caused by multi - path
水聲通道多途特性引起的信號衰落和碼間干擾是影響水下通信質量的主要因素，採用頻率分集技術可以處理幅度衰落，而跳頻技術則可以簡單、有效地抗多途引起的碼間干擾。 -
Performance analysis of differential frequency hopping communication system over rayleigh fading channel
接收機在瑞利通道下的性能研究 -
Research and design of pn code sequence fast frequency hopping frequency synthesizer
偽隨機序列快速跳頻頻率合成器的研製 -
The paper gives a kind of fft channelizing scheme used in the item, by analyzing different methods of reconnaissance and jamming for hopping frequency communication. and the paper gives a kind of design of frequency synthesis system on the basis of fpga and dds technology, and fpga is used to control the dds chip to produce different jamming signal
文章通過對目前各國正在研究使用的幾種跳頻通信偵察方案以及通信對抗中所用的各類干擾方式的介紹與分析比較，提出了一種在本實驗系統中應用的fft -通道化偵察測頻方案，並在此基礎上設計了一種基於fpga和dds技術的頻率合成模塊，採用fpga控制dds晶元產生各種干擾信號。 -
At last, some low phase noise pll designs are to be presented by me to verify the theroies of low phase noise design. all in a word, this article provide some meaningfull instruction for low phase noise hopping frequency pll design
在本文的最後給出了幾個低噪聲鎖相跳頻源的設計實例，對低噪聲鎖相跳頻源設計理論進行驗證，且取得了很高的相噪指標，具有一定的指導意義和參考價值。 -
To assure that the hybrid ds - fh spread - spectrum communication mode has better capability of information safety and inference suppression, i bring forward a design scheme of ds - fh spread - spectrum communication system and solving effectively the crucial problem such as how to choose the user address, how to choose the hopping frequency and how to avoid the collision of the frequency which is used by different users at the same time
為保證系統可靠、有效地工作，本文提出了一種ds - fh混合擴頻系統的設計方案，並且有效地解決了系統的用戶選址、頻率選擇和頻率碰撞等關鍵問題。通過系統設計模擬證實了ds - fh混合擴頻系統具有優于ds系統的抗干擾性能，並在一定程度上提高了系統的抗遠近效應能力。 -
First, the overall design of frequency hopping frequency synthesizer ( fhfs ) is given. the characteristics of this approach are discussed and the corresponding key technologies are also briefly introduced. then, the specific frequency properties of dds output signals and their effect on fh signals are carefully analyzed
論文首先介紹了跳頻頻率合成器的整體設計方案，分析了這種方案的特點，並對其中的關鍵技術進行了簡要的闡述；接著，分析了dds輸出信號的頻譜特性以及這些特性對跳頻信號的影響。 -
This paper mainly introduce the teconology of design modern microwave hopping frequency pll synthesizer with low phase noise. on the foundation of analysis of phase noise performance of pll circuit, i made some reasearch in system shcemes and methods for low phase noise design of microwave hopping frequency pll. some innovative ideas of low phase noise design about pll is presented in this paper
本文主要研究現代微波鎖相跳頻源低相噪設計技術。在對鎖相環噪聲性能分析的基礎上，對現代微波鎖相跳頻源多種低相位噪聲設計方案進行分析研究。提出了低噪聲鎖相跳頻源設計的一些獨道見解。
分享友人