臺灣博碩士論文加值系統

本論文提出一種干擾策略透過應用各式干擾訊號針對聯合戰術情報分配系 統(Joint Tactical Information Distribution System, JTIDS)的同步訊號進行干擾。如 同其他的無線通訊系統，JTIDS 亦需要同步機制，無論通道所造成的傳輸延遲長 短，系統內接收機可正確的偵測由傳送機發射的訊號的起始點。未來的電子戰中， 通訊系統扮演著重要的角色。如果可以阻斷敵軍的戰場通訊，將可提升戰爭的勝 率。
本論文針對 JTIDS 的同步訊號，透過施以不同的干擾訊號，進行位元錯誤率 的效能分析。干擾 JTIDS 同步訊號的策略為於一定時間內透過短時傅立葉轉換 偵測同步訊號的頻率，隨後並將逐漸估測出來的頻率應用於各式干擾方式中。藉 由不同的干擾方式，包括:寬頻干擾、多音干擾、連續型拂頻干擾、步階型拂頻 干擾與步階型寬頻拂略干擾，分析在不同的干擾功率、干擾頻點數與干擾頻寬下， 所造成的同步時間誤差與其相對應的位元錯誤率。
基於模擬可觀察到三個重要的結果，首先，連續型拂頻干擾單一個同步頻點 時，便可產生干擾成效;再者，寬頻干擾可造成最大的位元錯誤率效能;最後， 相較於其他干擾訊號，多音干擾在相同的干擾效能下，其所需的干擾功率最低。 本研究對軍事通訊系統發展具有參考價值。

In this work, we study a strategy to apply various jamming signals on the synchronization signals of a Joint Tactical Information Distribution System (JTIDS). Synchronization is necessary in a JTIDS like other wireless communication systems, so that the receiver can correctly detect the begin of the signals transmitted from a transmitter regardless the channel propagation delay.
In future electronic wars, a communication system plays an important role. If one can barrage the enemy’s battlefield communications, they can improve the odds significantly.
In this work, we analyze the performance of the JTIDS communication in terms of bit error rate (BER) by applying various jamming signals on the synchronization signals of the JTIDS.
The strategy of jamming the JTIDS is to detect the frequencies of synchronization signals through Short Time Fourier Transformation (STFT) in a certain time interval, and then to apply various jamming signals on the detected frequencies gradually.
We analyze the synchronization time error and the corresponding BER caused by the jamming signals with different jamming powers, jamming frequencies, and jamming signal bandwidth via different jamming methods including the Noise Frequency Modulation Jamming, the Multi-Tone Jamming, the Continuous Chirp Jamming, the Step Chirp Jamming, and the Step Full Band Sweep Jamming.
Three important observations are found based on the simulation results. The first, the Continuous Chirp Jamming can achieve useful jamming effect even just in a single frequency band. The second, Noise Frequency Modulation Jamming can maximize the jamming performance in terms of BER. The third, the Multi-Tone Jamming requires minimal jamming power to obtain the same jamming effects compared with other methods.
This study has the value of reference for development of military communication
systems.

摘要 I
Abstract II
致謝 IV
目錄 V
圖目錄 VII
表目錄 X
縮寫索引 XII
符號索引 XIV
第1章 緒論 1
1.1 研究動機 1
1.2 論文貢獻 2
1.3 章節概要 2
第2章 文獻探討與背景介紹 3
2.1 聯合戰術情報分配系統 3
2.1.1 聯合戰術情報分配系統分時多重進接 3
2.1.2 聯合戰術情報分配系統網同步 5
2.1.3 聯合戰術情報分配系統訊息格式 7
2.1.4 聯合戰術情報分配系統架構 9
2.2 干擾方式 18
2.2.1 寬頻干擾 18
2.2.2 分頻干擾 22
2.2.3 拂頻干擾 23
2.2.4 步階型寬頻拂略干擾 25
第3章 適應性同步段干擾 26
3.1 適性同步段干擾方法架構 26
3.2 自相關函數與互相關函數 28
3.2.1 最小相移鍵控自相關函數 28
3.2.2 最小相移鍵控與干擾函數互相關函數 29
第4章 適應性同步段干擾模擬與分析結果 44
4.1 適應性同步段干擾整體系統效能分析 44
4.1.1 適應性同步段寬頻干擾 44
4.1.2 適應性同步段分頻干擾效能分析 46
4.1.3 適應性同步段步階型拂頻干擾效能分析 48
4.1.4 適應性同步段連續型拂頻干擾效能分析 49
4.1.5 適應性步階型寬頻拂略干擾效能分析 50
4.2 適應性同步段干擾影響因子效能分析 52
4.2.1 同步時間誤差對於位元錯誤率分析 52
4.2.2 干擾功率敏感度分析 53
4.2.3 不同訊干比相同干擾頻點數分析 55
4.2.4 不同干擾頻點數相同訊干比分析 57
4.2.5 掃頻週期分析 59
4.2.6 干擾頻寬分析 60
第5章 結論與未來研究方向 63
參考文獻 65
附錄A 步階型寬頻拂略干擾理論模擬分析 68

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