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Direct Sequence Spread Spectrum Signal safety and reliability of the joint analysis of its IFF signal Design

Author: ChenQiang
Tutor: ZhouLiang
School: University of Electronic Science and Technology
Course: Cryptography
Keywords: IFF DSSS blind detection LPI
CLC: TN914.42
Type: Master's thesis
Year: 2008
Downloads: 90
Quote: 2
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Abstract


The advantages of spread spectrum communication are as follows: low probability of intercept, good anti-fading and anti-multi-path interference capability. It is very important for IFF system. With the development of the electron and information technology, the blind detection of spread spectrum signals in non-cooperation communication has been a research hot spot. This paper combines the blind detection of spread spectrum signals and the detection of communicators. And we propose the relation of the security and the reliability of communication system. For the different conditions, the designer of the communication system should adjust the requirement of the system’s security and the reliability. And then, the system can find the balance of the security and the reliability, also have a good performance.In the first two chapters, the main active CTR systems and the principle of spread spectrum communication are investigated. The definitions of PPK signal and PPK signal train are given, as well as that of signal set. Non-coherence detection for intermediate frequency signal of DS-PPK is taken into account and a non-coherence detection algorithm is offered to solve the problems brought by unknown phases.Chapter 3 introduces the study status of the blind detection of spread spectrum signals. We focus on the frequency-double and time-domain correlation detection method. By using the technology of correlate accumulation, it could have a better performance. The frequency-double detection method can compute the signal’s carrier wave frequency accurately.Chapter 4 analyses the LPI system. The design of a communication link to have low probability of interceptor capability is predicated on the requirement for it to operate in a hostile environment wherein the enemy tries to detect the presence of the communicator’s transmission. The communicator should minimize the power as low as possible. The detection probability of the LPI system is very low. A large part of this chapter shall be devoted to discussing and comparing the merits of several different interceptor detector topologies which are important either because of their simplicity of implementation or because of their theoretically optimum performance capability.Chapter 4 analyses the probability of anti-intercept and bit error for IFF signals. When the fault alarm probability is 0.01, for the ideal energy detection method, the non-idealistic with overlapping energy detection method and the non-idealistic without overlapping energy detection method, the communication system’s balance point of security and reliability is 5 dB , 6 dB and 6.5 dB respective. When the fault alarm probability is 0.001, the communication system’s balance point of security and reliability is 4 dB , 5 dB and 5.5 dB dB respective. For excursion shift time-domain correlation detection method, when the length of the PN chip is 35 and 4900, the communication system’s balance point of security and reliability is 0.5 dB and -4dBrespective for the fault alarm probability is 0.1. For circular shift time-domain correlation detection method, when the length of the PN chip is 35 and 4900, the communication system’s balance point of security and reliability is 0.5 dB and -4.5dBrespective for the fault alarm probability is 0.1.Chapter 6 summarized the whole paper and gives the expectations for following work.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system) > Frequency hopping spread spectrum communication system > Spread spectrum communication
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