Design Of Civil Air Defense Alarm Communication Module Based On Spresd Spectrum Technology

Modern warfare is a high-tech war, efficient and reliable civil air defense alarm is directly relative to national interests and people’s lives and property. Because the electromagnetic environment is deteriorating, the people’demand of the civil air de-fense alarm is increasing so existing alarm communication system need upgrade. The continuous development of communication technology provides an opportunity to update the civil air defense alarm communication system.Spresd spectrum commu-nication has the character of strong anti-jamming, anti-fading performances.If the advantages of the Spresd spectrum technology can be applied to the Civil Air De-fense Alarm communication system in order to create a dedicated and cost-effective communication means and equipment, no doubt it will be significant to make alarm systems upgrade.After analysis the status of Civil Air Defense Alarm at home and abroad the thesis propose the program which can achieve direct sequence spread spectrum communications using FPGA technology.As to the FPGA hardware the thesis achieve the four-layers circuit board’s pro-duction and debugging.External circuit’s design includes reset, memory, AS inter-face, JTAG interface which using EP1C6Q240 FPGA device of the family Cyclo-neTM as core chip, using CAT1025 chip as reset chip, using NorFlash(AT49BV163AT)、SRAM(IS61LV25616AL)、SDRAM(K4S641632H)、Active serial configuration device (EPCS4).EPCS4 is used to store FPGA con-figuration data and configuration.As to the software system, Quartus II and VHDL languages are used to write the relevant programs which include the circulated redundancy check model, pseudo-random code model, direct digital dynthesis module,spresd spectrum signal generator module.