fh frequency hopping 中文意思是什麼
fh frequency hopping
解釋
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。 -
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。 -
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。 -
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。 -
In addition, hybrid spread - spectrum communication system is propitious to enhance anti - jamming performance of the system that is make up of direct sequence ( ds ) and frequency hopping ( fh ), and it can satisfy the require of anti - jamming of systems. it concentrate their virtue and overcome shortage in single spread spectrum style. this paper discusses the aspect in detail
另外，將擴頻技術中應用最廣泛的兩項技術直序擴頻（ ds ）和跳頻（ fh ）結合在一起，構成混合擴頻通信系統，有利於提高系統的抗干擾性能，更能滿足系統抗干擾的要求，而且將跳頻系統和直擴系統的優點集中起來，克服了單一擴頻方式的不足。 -
With the development of communication technology, the communication signal environment is getting more and more complex. fh ( frequency hopping ) signal is used widely in the battlefield, and direction finding becomes an important method to get communication information
隨著通信技術的迅速發展，跳頻、直擴等信號在軍事領域獲得廣泛應用，測向成為情報獲取的主要手段之一。 -
The system completes anti - jamming function of frequency - hopping ( fh ) and direct sequence spread spectrum ( ds - ss ) by exploiting dsps + fpga structure, so it is flexible and modular
它採用dsps + fpga的結構，實現跳頻擴頻和直接序列擴頻的抗干擾功能，因而結構靈活，適于模塊化設計。 -
The author has applied bcpc code to two fields. one is a frequency hopping ( fh ) communication system. theoretic analysis and simulation results show bcpc sequence features ideal random performance, good hamming correlation property and wide fll gap
將scqc碼應用於跳/擴頻通信系統（ fh - ss ）的碼變型（即反轉移相鍵控）器中，分析了scqc碼序列的性能。 -
Considering the bad condition and the continuous noise existing in the factory, we carry out suggestion of further development of the fh ( frequency hopping ) algorithm to adapt for the demand of security and reliability of data transmission on the fieldbus. the essay researches the fh core in detail and carries out the improved link state history algorithm
為了在長時間干擾源的條件下，實現藍牙無線的可靠傳輸，本文對藍牙的跳頻內核各邏輯控制器進行深入的研究，對lsh跳頻演算法提出改進方案，模擬結果證實了lsh跳頻改進方案是有效的。 -
In this paper, bit - error rate performance analyses are presented for coded and un - coded frequency hopping m - ary frequency - shift keyed systems under the condition of additive white gaussian noise ( awgn ) and partial band noise jamming and multitone jamming. the use of error - correct codes provide a way to improve the performance of frequency hopping system, particularly the use of reed - solomon code in a fh system under the condition of partial band noise jamming can greatly improve the performance of system. so we provide the way of coding and decoding of rs code in c language. in the end, we offer the simulation of the performance of time diversity fh / 2fsk system over partial band jamming noise channels
第一章為緒論，敘述跳頻通信的發展趨勢，以及基本概念，第二章及第三章介紹提高抗部分頻帶干擾的前向糾錯碼reed - solomon碼的原理和實現方法。第四章研究跳頻通信系統在各種干擾條件下的性能。最後在第五章以fh mfsk系統為例，探討在部分頻帶干擾下的系統性能，並進行計算機模擬，模擬結果表明採用分集技術和各種編碼技術對于系統的性能改善具有明顯的效果。 -
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。 -
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 / vhf ( high frequency / very high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and ensure the safety and validity of chain of military command
跳頻技術是擴頻技術的一種，是80年代以來出現的一種新的通信方式。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超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，保證了軍事指揮系統的安全和有效性。 -
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。 -
By analyzing the spectrum feature and correlation feature of walsh sequence, we find that it has the spectrum feature of ds / fh ( direct spread / frequency hopping ) communication mode
我們分析了walsh函數序列的頻譜特性和相關特性，結果表明，該序列具有ds fh （直擴跳頻）的頻譜特性。 -
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。 -
A new hybrid spread - spectrum ( ds - fh ) communication mode is discussed in detail in this paper, walsh sequence is used as frequency - hopping sequence in this mode
本文將討論一種新型的ds - fh混合擴頻通信系統。在這種系統中，使用walsh函數序列作為跳頻序列。
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