| Pseudo-code phase-modulation pulse Doppler combined fuze integrates the advantages of fuze of pseudo-code system and phase-modulation pulse Doppler system, which is a fuze system that can not only measure the distance, but also measure the speed.It utilizes the autocorrelation function characteristics of the pseudo-code pulse combined signal to measure the distance of the objective, and also utilizes Doppler frequency to realize the speed recognition of the objective, so as to realize the dual recognition for the objective distance and speed and strengthen the reliability of the work. The following contents are mainly included in this text:1. The operating principle of the pseudo-code pulse combined signal is introduced, and then the simulation integration environment Simulink is used to establish the system simulation block diagram to analyze each part of the system in details; the codes are prepared, and then MATLAB is used to perform the simulation analysis for some signals in details. Extract method for Doppler frequency is researched on such basis.2. Phase locked loop frequency synthesis technique is introduced. The design of frequency source of this system is completed by taking ADF4360-0 as the center.3. ISE6.2b software and XC95144CPLD of XILINX Company are used to complete the design and commissioning of m-sequence pseudo-code signal generator, switch control procedure and m-sequence pseudo-code digital correlator. Modelsim software is utilized to emulate the procedure.4. The modulation chip AD8349 produced by ADI is introduced, which is used as the main module to complete the design of modulation circuit; the demodulation chip AD8347 is introduced and utilized to complete the design of demodulation circuit.5. At last, anti-interference property of the system has been analyzed according to the actual working conditions of the fuze. |
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