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Pseudo Code Phase Linear Frequency Modulation Fuze Technology Research

Author: ShangHaoQiang
Tutor: ZhaoHuiChang
School: Nanjing University of Technology and Engineering
Course: Communication and Information System
Keywords: Pseudorandom Code Phase Modulation sawtooth wave FM Modulation technology CPLD DDS
CLC: TJ430
Type: Master's thesis
Year: 2009
Downloads: 127
Quote: 0
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Abstract


Because of the Doppler sensitivity of Pseudo-random code, the ranging ability of Pseudo_random code phase modulation fuse is significantly reduced when the speed between the bomb and the target is high. Therefore, the application of Pseudorandom code phase modulation fuse is limited.The ranging of Pseudo-random code phase modulation combined with linear frequency modulation fuze is achieved by correlating the echo from the target using the delayed Pseudorandom code, and the velocity is measured using the difference frequency signal which is also can reduce the impact of Doppler effect.In this paper, the operating principle of the complex modulation fuze using pseudo random code phase modulation and linear frequency modulation is introduced in detail, and then the performance and the principle of parameters selection of the complex modulation fuze are discussed. In addition ,time-frequency domains of target echo signal is analyzed,and then the process of target echo signal is simulated by using the software Matlab. Besides, anti-interference performance and anti-noise performance of the complex modulation fuze is analyzed,and then the modulation circuit of the complex modulation fuze is designed. Moreover,by using the CPLD chip XC95144XL pseudo-code signals and the control signal of DDS chips AD9852 which supply sawtooth FM signal is produced. Furthermore ,by using the software ModelSim serial communication between DDS and CPLD is simulated,and then the bandpass filter for the DDS output is designed. Finally,by using ADF4360-1 chip the carrier wave is produced, and then By using AD8349 the transmitting signal of the complex modulation fuze is realized.

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CLC: > Industrial Technology > Arms industry > Ammunition, fuses, pyrotechnics > Fuse > General issues
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