freepeople性欧美熟妇, 色戒完整版无删减158分钟hd, 无码精品国产vα在线观看DVD, 丰满少妇伦精品无码专区在线观看,艾栗栗与纹身男宾馆3p50分钟,国产AV片在线观看,黑人与美女高潮,18岁女RAPPERDISSSUBS,国产手机在机看影片

正文內(nèi)容

轉(zhuǎn)發(fā)式gps欺騙干擾機的仿真建模與實現(xiàn)所有專業(yè)-展示頁

2025-05-26 15:52本頁面
  

【正文】 甚至可通過因特網(wǎng)采購到這種裝置?;羝战鹚勾髮W(xué)應(yīng)用物理實驗室舉行的一次航空航天工程師和其它專業(yè)人員的研討會上,首次公開展示了一種得煙盒大小的自制干擾機,它采用 12 伏電池作動力,產(chǎn)生 100 毫瓦的輸出功率,通過一根細小的全向天線發(fā)射信號。 美國政府、工業(yè)部門和學(xué)術(shù)界對 GPS 受干擾的問題進行了大量研究和模擬,提出即使沒有掌握先進技術(shù)的敵方也能容易、快速、廉價地制造和使用許多 GPS干擾機 ,以摧毀依靠 GPS 制導(dǎo)的美國武器和其它平臺。 衛(wèi)星導(dǎo)航系統(tǒng)由于衛(wèi)星信號功率較低, GPS 信號的 能量大約相當于在 幾 千公里以外一盞家用電燈的能量,要比廣播電視的信號要弱 1,000,000,000 倍,正是因為它過于微弱,因而極易受到多種形式的有意或無意干擾,導(dǎo)致接收機導(dǎo)航定位性能下降,甚至無法正常工作。目前,世界上主要的衛(wèi)星導(dǎo)航系統(tǒng)包括:美國的 GPS、歐盟的 GALILEO、俄羅斯 GLONASS 和中國的北斗導(dǎo)航系統(tǒng),其中美國的 GPS 應(yīng)用最為廣泛。主要目的是為陸海空三大領(lǐng)域提供實時、全天候和全球性的導(dǎo)航服務(wù),并用于情報收集、核爆監(jiān)測和應(yīng)急通訊等一些軍事目的,經(jīng)過 20 余年的研究實驗,耗資300 億美元,到 1994 年,全球覆蓋率高達 98%的 24 顆 GPS 衛(wèi)星星座己布設(shè)完成。 GPS 起始于 1958 年美國軍方的一個項目, 1964 年投入使用。 關(guān)鍵 字 : 全球定位系統(tǒng);轉(zhuǎn)發(fā)式干擾;模塊 化設(shè)計,仿真 杭州電子科技大學(xué)本科畢業(yè)設(shè)計 2 Abstract With the development of the technology, The Global Position System has been used widely. The new application of GPS technology in the military field is how to destroy enemy Navigation system and enshroud effectively ourselves utilizing the GPS counter technology. In the GPS interference technology, the retransmitted jamming has the advantages of low sending power, unawareness of the PRN code structure of GPS signal and simple implementation. The retransmitted jamming principle is studied in this dissertation. Based on the analysis of the GPS position theory, the effect of jamming prototype is studied and every part of the jamming prototype is analyzed. The design and implementation of jamming prototype have been done too. The retransmitted jamming method mainly makes use of signal’s natural delay, so the jamming signal is pletely the same as navigating signal, except for the differently delay time. Besides, the power of retransmitted jamming signal is greater than the navigation signal, SO GPS receiver will probably receive the jamming signal, which results in it’s getting the false pseudo range and not being position precisely. At the first and the second chapter ,I not only explain the development history and the developing situation of GPS in detail, but also estimate roughly its development direction, in addition, the basic ponents of GPS is simply summarized. At the third chapter, the main content is that the function of jamming prototype is the modularization designed. The whole module is divided into three parts including signalreceiving unit, jamming signal generation unit and jamming signal transmission unit, and the function of each part is described. The fourth chapter emphasizes analyzing and paring different simulation result in brief, which can be used of checking the authenticity of the theory basis. Key words: GPS, Retransmitted Jamming, Modularization designed, Simulation 杭州電子科技大學(xué)本科畢業(yè)設(shè)計 目 錄 1 引言 ................................................................................................................................ 1 2 GPS 簡介及發(fā)展現(xiàn)狀 ................................................................................................... 3 GPS 簡介 ............................................................................................................. 3 GPS 分類及應(yīng)用特點 ......................................................................................... 3 GPS 發(fā)展現(xiàn)狀 ..................................................................................................... 4 GPS 發(fā)展前景 ..................................................................................................... 4 GPS 信號 ............................................................................................................. 5 3 轉(zhuǎn)發(fā)式 GPS 欺騙干擾機 ............................................................................................. 7 干擾機 ................................................................................................................. 7 轉(zhuǎn)發(fā)式干擾簡介 ................................................................................................. 7 轉(zhuǎn)發(fā)式 GPS 欺騙干擾機 課題的提出 ............................................................... 8 轉(zhuǎn)發(fā)式 GPS 欺騙干擾機設(shè)計要點 ................................................................. 10 轉(zhuǎn)發(fā)式 GPS 欺騙干擾機發(fā)展方向 ................................................................. 11 建立轉(zhuǎn)發(fā)式 GPS 欺騙干擾機動態(tài)模型 ......................................................... 12 干擾信號接收單元的實現(xiàn) ............................................................................ 13 干擾信號發(fā)送單元的實現(xiàn) ............................................................................ 16 干擾信號生成單元的實現(xiàn) ............................................................................ 18 4 仿真效果分析 ............................................................................................................. 22 GPS 信號生成 ................................................................................................... 22 GPS 信號的延時轉(zhuǎn)發(fā) ....................................................................................... 23 GPS 轉(zhuǎn)發(fā)信號的干擾 ....................................................................................... 25 5 結(jié)論 ............................................................................................................................. 27 6 致謝 ............................................................................................................................. 28 7 參考文獻 ..................................................................................................................... 29 杭州電子科技大學(xué)本科畢業(yè)設(shè)計 1 1 引言 自 1957 年前蘇聯(lián)將世界第一顆人造衛(wèi)星送入環(huán)地軌道以來,針對衛(wèi)星信號的干擾與抗干擾技術(shù)的發(fā)展日新月異。在第三章,主要 對干擾機的各部分功能進行細化和進一步的 模塊化設(shè)計 ,將 總體模型分為三個單元,包括:信號接收單元、干擾信號生成單元、干擾信號發(fā)送單元。從而使 GPS 接收機獲得錯誤的偽距,達不到精確的定位。因此,干擾信號與導(dǎo)航信號完全相同,只是延遲時間有所不同。在分析了 GPS 定位原理的基礎(chǔ)上,對 轉(zhuǎn)發(fā)式干擾 進行了可行性分析,完成了轉(zhuǎn)發(fā)式干擾原理樣機的設(shè)計與實現(xiàn),并著重對干擾機的射頻電路進行了研究。在眾多干擾技術(shù)中,轉(zhuǎn)發(fā)式干擾有著發(fā)射 功率低,不需要了解 GPS信號偽碼結(jié)構(gòu),實現(xiàn)簡單等優(yōu)點。杭州電子科技大學(xué)本科畢業(yè)設(shè)計 本科畢業(yè) 設(shè)計 ( 2020 屆) 題 目 轉(zhuǎn)發(fā)式 GPS欺騙干擾機的仿真建模與實現(xiàn) 學(xué) 院 通信工程 學(xué)院 專 業(yè) 信息對抗技術(shù) 班 級 09083511 學(xué) 號 0908313
點擊復(fù)制文檔內(nèi)容
畢業(yè)設(shè)計相關(guān)推薦
文庫吧 www.dybbs8.com
備案圖鄂ICP備17016276號-1