應(yīng)用于2.4GHz雙向變頻系統(tǒng)的混沌跳頻頻率合成器的設(shè)計(jì)
[Abstract]:In today's society, communication technology has been developed quite mature, in the spread spectrum communication, secure communications and other areas of research and application, the requirements are also increasing. At the same time, the application of chaos principle in circuit and communication has been paid more attention and development. The randomness of chaos itself is very suitable for the need of security in communication. Furthermore, chaos itself is sensitive to initial values and can provide a large number of uncorrelated, quasi-random frequency hopping sequences, which can be accurately restored by corresponding chaotic maps and initial values. In this paper, a chaotic phase-hopping loop frequency synthesizer is designed, which is mainly used in the frequency band of 2GHz. The main working principle is that the chaotic sequence is generated by calculating the chaotic mapping equation of single chip computer, and the generated sequence is transformed appropriately to make it conform to the control word format of the PLL frequency synthesizer. The converted sequence is input into the PLL frequency synthesizer according to a certain time sequence requirement, and the chaotic sequence controls the frequency synthesizer to generate the chaotic frequency hopping frequency. Before the chaotic sequence generation operation is carried out in the single chip microcomputer, it is necessary to scale up the two sides of the chaotic mapping equation properly, so that it can be operated in the single chip microcomputer. According to the requirements of PLL frequency synthesis chip for the control word data format and transmission sequence, the operation results are properly processed and input to the chip along with clock signal and control signal. In the PLL frequency synthesizer, different frequency signals are synthesized according to different control words. The frequency value of the output chaotic frequency hopping signal is exactly the same as that of the chaotic mapping equation. The results of subsequent tests in this paper show that the function of generating chaotic frequency-hopping signals can be fully realized by using digital components, and the basic performance indexes can also meet the requirements. Compared with the traditional analog circuit, the system has stronger anti-interference ability to the outside world. The 600 sets of chaotic frequency hopping signal data generated by this design are always in chaotic state during the testing process, and the noise coefficient can also meet the requirements in the 2GHz center frequency range. It has a good application prospect in the field of spread spectrum communication even higher military communication.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TN74
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