跳頻展頻技術 的英文怎麼說
中文拼音 [tiàobīnzhǎnbīnjìshù]
跳頻展頻技術
英文
frequency hopping spread spectrum-
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。( 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。Frequency hopping spread spectrum
跳頻展頻技術Short - wave communication is the most important scheme in military communication. with the fast development of various new technology and new systems, such as dsp technology, micro processing technology, frequency - hopping technology, error correction technology, short - wave communication has already been widely applied in military communication, marine communication, board communication and so on
短波通信是現代軍事通信中最重要的通信手段，隨著隨著數字信號處理（ dsp ）技術、微處理技術，自適應技術、跳頻技術，糾錯技術，分集技術等各種新技術和新體制的飛速發展，短波通信已廣泛應用在軍事通信、海上通信、機載通信等各方面。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。Depending on the development of reconnaissance and interference techniques, spread - frequency communication is gradually becoming the effective communication manner in order to reduce the probability of being captured or interfered, to enhance the security of communication, and to improve the anti - jamming ability of the communication system
隨著通信偵察和干擾技術的發展，為了降低通信過程中被截獲、被干擾的概率，提高通信的可靠性，增強通信系統的抗干擾能力，擴頻通信逐漸成為現代通信的一種對抗干擾的有效通信方式，跳頻通信是擴頻通信中的一種。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。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。In chapter three, the theory of particular anti - jamming technologies are analyzed, especially the spread spectrum ( ss ) is one of the most important anti - jamming technologies, including direct sequence spread spectrum ( dsss ), frequency hopping spread spectrum ( fhss ) and other improved technologies
第三章研究了時域、頻域、功率域多種抗干擾技術的抗干擾機理和定量描述抗干擾能力的方法，其中擴展頻譜技術是主流的抗干擾技術，包括直接序列擴頻和跳頻技術以及它們的改進方案。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。分享友人