Study On Reconnaissance Of Frequency Hopping Communication

Frequency hopping communication is the main manner in modern military communication, the development of the frequency hopping has made the conventional single frequency interferential no use in the modern communication countermeasure。Researching on the RTFH (reconnaissance technique of frequency-hopping communications) to disturb enemy's communications system effectively, it has more value in the communication countermeasure domain.The content of this paper base on the RTFH, using modern signal analysis method, carry out the detection, separation, estimate of the frequency hopping communication. The main content of the paper is described as follows:In chapter 1, we introduce the main task of the RTFH, expound the study status on RTFH, the trend of the research on RTFH is summarized. The skeleton and main subjects of the thesis are also introduced.In chapter 2, we have given the development of the FH communication system, the applications in military equipment and in civilian equipment, and introduce the design requirement of FH sequence, FH framework of network and the specification of FH, the fast FH and the slow FH.In chapter 3, this chapter gives us the blind detection of FH and the blind separation of the mixed FH signals. We use multi-hops correlation to detect the FH from the signal of intercept receiver get. We recommend some idea of separation method using the character of the FH meshwork. In the blind separation of the FH signal, we introduce the algorithm ICA (independent component analysis) particularly.In chapter 4, we give the principle of the FH figure and random sequence, introduce the relation between the FH communicator and the jammer. We use the STFT to estimate the FH character parameters, and we get the anticipate result.In chapter 5, we summarize the paper, the work that the paper have done and the further work are pointed out.