Pn Phase Modulation And Random Pulse Composite System Fuse

The pseudo-noise (PN) code phase modulation and pseudorandom pulse position modulation (PPM) combined fuze, having excellent cut-off performance of the distance and strong anti-jamming capability, is one of the important directions of the fuse develop.The process of its modulation is just as that first PN code is modulated by pseudorandom pulse position,this will process a new peudorandom pulse position modulation (PPM) PN code then the new code is modulated。The main content studied and discussed are as followings:(1) The theory of The PN code phase modulation and pseudorandom pulse position modulation (PPM) combined fuze. The design and charateristic of pseudorandom pulse position modulation (PPM) PN code.(2) The study of oppressive anti-jamming performence about pseudo-noise (PN) code phase modulation and pseudorandom pulse position modulation (PPM) combined fuze.(3) By using Xilinx's XC9500 Series CPLD and software named ISE,we can build pseudorandom pulse position modulation (PPM) PN code signal generator and digital correlator about pseudorandom pulse position modulation (PPM) PN code, that has much smaller bulk as it used to.(4) By using ADF4113, we design a frequency synchronism of 2.477G as carrier wave including the design of VCO and loop filter and the write of controlling word to the ADF4113 by microprocessor.(5) By using AD8349, we design the phase modulation circuit. The pseudorandom pulse position modulation (PPM) PN code from CPLD can be modulated by it。...