frequency hopping 中文意思是什麼
frequency hopping
解釋
跳頻，頻率跳動-
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 -
Since commercial pll ic came out, phase - locked - loop frequency synthesis has become widely accepted. but when narrow frequency - step is required, the loop bandwidth has to decrease while cannot meet the demand of frequency - hopping speed
數字鎖相集成器件出現以來，鎖相式頻率合成器得到迅速發展，但是當需要窄頻率步進時，環路帶寬需要降低，致使鎖定時間變長，不能滿足快速跳頻的要求。 -
Chapter 2 treats the design of digital phase modulation system in frequency hopping mode communication
第二章說明了跳頻傳輸模式下數字相位調制系統的設計。 -
The core of a frequency hopping system is the frequency synthesizer
在跳頻系統中，頻率合成器是核心部件。 -
Design of satellite frequency - hopping signal ' s inception and processing based on pci interface
介面的衛星跳頻信號接收處理卡的設計 -
Study on frequency - hopping detection algorithm based on edge detection
煤泥浮選泡沫數字圖像處理中的邊緣檢測演算法研究 -
When the station is in radio silence state, it ca n ' t keep frequency hopping synchronization with other station, and ca n ' t receive the other station the data that send out, and also ca n ' t send out any data
處于靜默狀態的電臺不能夠與其它電臺保持跳頻同步，不能夠接收其它電臺發送的數據，也不能夠發送任何數據。 -
The last gives the target of this paper. chapter 2 introduces the theory of frequency - hopping and gmsk, at the same time gives out a feasible method of fh synchronization and data transmission
第二章研究了跳頻系統的基本原理和參數特徵，並根據對實際戰場中的干擾分析和數傳同步的特點給出了一種跳頻同步方法和數據傳輸機制。
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