安全通訊之低偵測/截收率(LPD/I)性能模擬分析研究

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姓名

許閎傑(Hong-Jie Shiu) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

安全通訊之低偵測/截收率(LPD/I)性能模擬分析研究
(Performance Simulation and Analysis of LPD/LPI for Secure Communications)

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摘要(中)

近些年來由於個人行動通訊之需求及發展，各種廣域或區域之無線及有線軍/民用通訊系統，隨者相關電子及通訊產業技術之創新及突破而蓬勃發展。然而，為遂行特定戰術性作為或目的，尤其針對戰術性通訊系統而言，及為降低敵方意圖偵測及截收整個通訊系統之私密資訊傳送性能，安全之通訊系統普遍需具備低信號偵測及截收率(LPD/I)性能，以降低敵方之信號偵測及截收效益。因此，研究如何評估通訊系統之低偵測/截收率(Low Probability of Detection/ Interception)性能便是本論文之重要研究課題。

摘要(英)

Due to the requirements and developments of personal mobile communications for the past several decades, all kinds of global and local wireless/wire and military/civil communications systems are developing flourishingly in accordance with the novelties and breakthrough of all related electronic and communication techniques.
Nevertheless, in order to fulfill specific tactical operations or objectives, especially for the tactical communications systems, and to decrease the intentions of the adversaries to detect and intercept the transmissions of some specified private information, secure communications systems should have the low probability of detection and interception capability to lower the probability of being detected and intercepted by the adversaries. Therefore, it’s a very important research topic of this thesis to evaluate the performance of low probability of detection and interception (LPD/I).

關鍵字(中)

★ 展頻技術
★ 安全通訊
★ 低偵測率
★ 衛星通訊

關鍵字(英)

★ spread spectrum
★ TRANSEC
★ LPD
★ satellite communication

論文目次

CHAPTER 1 INTRODUCTION 1
1.1 MOTIVATIONS 1
1.2 OBJECTIVES 1
1.3 GENERAL DESCRIPTIONS 2
1.4 THESIS ORGANIZATION 3
CHAPTER 2 TRANSEC 5
2.1 GENERAL DESCRIPTIONS 5
2.2 GOALS OF EXPLOITATION SYSTEMS 8
2.3 LINK BUDGETS REVISIT 9
2.3.1 Transmitter 9
2.3.2 Receiver 11
2.3.3 Noise 11
2.3.4 GR/Te of a Receiver 13
2.3.5 The Media 13
2.3.6 Losses experienced in Line of Sight Links 16
2.3.7 Link Equations 18
2.4 TRANSEC PREVIEWS 18
2.4.1 Scenarios 18
2.4.2 Formulations 20
2.4.3 Simulations 22
CHAPTER 3 S2 MODULATION TECHNIQUES REVIEWS 26
3.1 GENERAL DESCRIPTIONS 26
3.2 FREQUENCY HOPPING 28
3.2.1 Transmitter Functions 28
3.2.2 Signal Properties 29
3.2.3 Receiver Functions 30
3.2.4 Signal Hiding Using Frequency Hopping 31
3.3 TIME HOPPING 32
3.3.1 Transmitter Functions 33
3.3.2 Signal Properties 33
3.3.3 Receiver Functions 34
3.3.4 Signal Hiding Using Time Hopping 35
3.4 DIRECT SEQUENCE 36
3.4.1 Transmitter Functions 36
3.4.2 Signal Properties 38
3.4.3 Receiver Functions 39
3.4.4 Signal Spreading Using Direct Sequence 40
3.4.5 The Signal Suppression Factor 41
3.5 OTHER LPE TECHNIQUES 43
3.6 CHARACTERISTICS OF SPREAD SPECTRUM TRANSEC SYSTEMS 45
3.6.1 Time Hopping, LPE systems 46
3.6.2 Frequency Hopping, LPE systems 47
3.6.3 Direct Sequence, LPE Systems 48
3.6.4 Hybrid, LPE Systems 49
CHAPTER 4 S2 SIGNALS DESIGNS AGAINST INTERCEPT RECEIVERS 50
4.1 OVERVIEW OF LINEAR RECEIVERS 51
4.1.1 Signal Detection in Noise 52
4.1.2 Feature Estimation in Noise 55
4.1.3 Message Recovery in Noise 56
4.2 DESIGNING FH SIGNALS TO COUNTER LINEAR RECEIVERS 58
4.2.1 Design to Minimize Coverage 58
4.2.2 Design to Minimize Detection 59
4.2.3 Design to Minimize Interception 60
4.2.4 Design to Minimize Exploitation 61
4.3 DESIGNING DS SIGNALS TO COUNTER LINEAR RECEIVERS 61
4.3.1 Design to Minimize Coverage 62
4.3.2 Design to Minimize Detection 62
4.3.3 Design to Minimize Intercept 63
4.3.4 Design to Minimize Exploitation 63
4.4 OVERVIEW OF NONLINEAR RECEIVERS 64
4.4.1 Signal Detection Using Nonlinear Receivers 64
4.4.2 Feature Extraction Using Nonlinear Receivers 67
4.5 DESIGNING FH SIGNALS TO COUNTER NONLINEAR DETECTION 69
4.6 DESIGNING DS SIGNALS TO COUNTER NONLINEAR DETECTION 69
CHAPTER 5 TRANSEC ANALYSIS AND SIMULATIONS 71
5.1 CONTOURS OF CONSTANT INTERCEPT SIGNAL-TO-NOISE RATIO 71
5.1.1 Contours of Constant Intercept SNR 72
5.1.2 Simulation Results 74
5.2 LINE-OF-SIGHT FACTOR 76
5.3 SIGNAL DETECTION REQUIREMENTS 78
5.4 ANTENNA GAIN FACTOR 80
5.5 ANALYSIS OF LINEAR INTERCEPT RECEIVER 81
5.6 ANALYSIS OF NONLINEAR INTERCEPT RECEIVER 84
CHAPTER 6 CONCLUSIONS 88
REFERENCES 90

參考文獻

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指導教授

蔡木金(Mu-King Tsay)

審核日期

2006-7-3

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