Research The Spread-spectrum Communication System Of Low-frequency Ground-penetrating

Mine and other underground buildings demand reliable emergency communicationsystem, which can be supported by low-frequency ground-penetrating communication system.Depending on the stratified stratum as the transmission medium, the channel of thelow-frequency ground-penetrating communication system cannot be affected by the disastersand accidents, so it is considered as the most reliable means of emergency communication.However, it’s especially important to improve the anti-interference ability of theground-penetrating communication system which can be easily interfered by various factors.The research of the ground-penetrating communication is mainly focused on three aspectsincluding the propagation characteristics of the electromagnetic wave in the stratum, thedetermination of the formation parameters and the design of the ground-penetratingcommunication system. This paper provides the advanced design for its anti-interferenceability. The research includes:(1) Analyze the the propagation characteristics of theelectromagnetic wave in the stratum, on which it is based to determine the spread spectrummodulation as the improved methods of the system performance.(2) According to this project,this paper carried out Algorithm Derivation, performance analysis and the whole design of thecircuit. The simulation results show that the project for this system is feasible and effective.(3)Apply hierarchy IC design for the spread-spectrum system suitable to the low-frequencyground-penetrating. Meanwhile complete the whole design of the system and the design andthe simulation of the main circuit module. Finally generate the simulation waveform of theIC’s whole performance then analyze it.The characteristic of the project is the digital integration: It can not only complete thefunction of the data’s code、spread-spectrum modulation and demodulation on the platformFPGA, but also design to be ASIC. Hence this is a project to realize the digital spreadspectrum with higher compatibility. For the circuit design, this paper divides the performancemodule, then accomplish the whole design of the system by VHDL. It has prosperous prospects.