Military Communications and Information Technology: A Trusted ...

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504 Military Communications and Information Technology... Figure 6. Time synchronization mechanism After completing the time and frequency synchronization, the proper procedure of binary signature extraction takes place. Since the same bit is embedded in two adjacent frames (subframes) of the host signal, on the receiver side each assayed signal frame is divided into two further frames. The next step (9) is the determination of the scalar product value between the difference of amplitude spectra for two adjacent frames and the following formulation: where: R N1 2 1 Xi Xi Pi (9) i0 10 k k X 10log DFT x (10) P i – pattern. On the basis of the scalar product value (9) the value of the bit hidden in the given portion of the signal is determined: 0, R 0 BS (11) 1, R 0 III. Results of the analysis The first analysis concerned the efficiency of operation of the synchronization algorithm. Figs. 7 and 8 present the accuracy of synchronization in the function of drift
Chapter 4: Information Assurance & Cyber Defence 505 and time of the analyzed signal on the receiver side. The principle of the synchronization algorithm is based on the measurement of the value of angle phase difference between two adjacent harmonics (8). For low values of drift m (or high, approaching N) the phase difference value approaches 0 (or 2π). Therefore, the determined drift is encumbered with high error. The best results are obtained for drift falling within 50-950 samples. Synchronization accuracy can be improved by extending the time of the analyzed signal on the receiver side or increasing the pilot line power (increasing the power by 3 dB above the LT min level does not deteriorate the audio signal). Figure 7. Synchronization accuracy in the function of drift Figure 8. Synchronization accuracy in the function of signal analysis time The results for extraction efficiency in the function of signal analysis time on the receiver side are provided in Fig. 9. The analysis was carried out for drift m = 10 samples and m = 300 samples, for two watermark signal power correction
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Military Communications and Informa
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Contents Foreword .................
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Contents 5 Methodology for Gatherin
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8 Military Communications and Infor
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Building a Layered Enterprise Archi
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Chapter 1: Concepts and Solutions f
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Applying NAF for Performance Analys
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Openness in Military Systems Jessic
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The Concept of Integration Tool for
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CFBLNet: A Coalition Capability Ena
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Selected Aspects of Effective RCIED
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84 Military Communications and Info
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100 Military Communications and Inf
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Chapter 2 Communications and Inform
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Use of Cross Domain Guards for CoNS
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Chapter 2: Communications and Infor
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Chapter 3 Information Technology fo
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Run-Time Ontology on the Basis of E
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Chapter 3: Information Technology f
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A Robust and Scalable Peer-to-Peer
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Automatic Exploitation of Multiling
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Information Fusion Under Network Co
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Commanding Multi-Robot Systems with
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Application of CID Server in Decisi
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Managing Lessons Learnt from Daily
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Federated Cyber Defence System - Ap
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Development of High Assurance Guard
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Network Traffic Characteristics for
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Methodology for Gathering Data Conc
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On Multi-Level Secure Structured Co
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Military Communications and Information Technology: A Trusted ...

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