Application and Research of Signal Transmission in Coal Mine Underground for Spread Spectrum Communication

摘要

The problem existed in signal transmission system of coal mine, especially down the well are summarized. It is pointed that the wired cable especially power line has the economic, valid, dependable characteristics in signal transmission communication under the well A new system based on spread spectrum is put forward. In this system, power line is used in the main lane, low voltage power line or wireless communication is used in the other lanes and mining areas to make complete signal transmission system under well. This system has the advantages of economy, cheapness, good protective measure and "No New Wire" ,and exploit the advantage of SS, such as strong anti-interference. Analog signal can be compatible with digital signal in this system. SS is easily to realize CDMA, and it is applied on top of multicarrier modulation to provide a simple and efficient multiple address method. The number of the random sequence is much more enough to guarantee address code. The feasibility of the plane was analyzed based on the related tests results in the end.