System Realization For The Transmission Of Multiplex Measuring Signals Using Spread Spectrum Technology Based On DSP

In the field of measuring and controlling, it is offen necessary to transmit the multiplex measuring signals at the same time, but traditional transmission means are often interfered by complicated environment around and causing the signals being distorted. It can enhance the reliability of the multiplex measuring signals by using the anti-jamming characteristic of spread spectrum communication technology. At the same time, using the orthogonal characteristic of spread sequence can realize the CDM transmission of the multiplex measuring signals.This paper adopt a method of spread the frequency of each signals and simultaneously using CDM to go on transmission.It can make the system more predigestion,and enhance the ratio utilization of the frequency at the same time.This paper discussed the theories and realizing methods about the multiplex measuring signals of spread spectrum transmission based on DSP. Firstly the paper discussed the theoretic knowledge of this task, gave the particular explaination and analysis such as the basic theories of spread spectrum communication, the multiplexing of signals, DS system and its several key technologies.Chose the technologies which were fit to this system. Make analysis of the capture module and track module in the synchronization system of the receiver. After realizing the coarse synchronization by using the capture circuit,and then make the phase entirely synchronization through the track circuit to resume the original signals.Then expatiated the design of the hardware platform of this system, detailed introduced each chips in this system and gave the circuit analysis and design of each chips.The hardware platform of this system was focused on DSP, and also introduced the hardware working mechanism of the whole system.Finally expatiated the software design of the DSP system, including sender and receiver, and gave relevant program flow chart. In addition, the FPGA design of synchronized technology in the receiver was given and the simulation validation was also carried out.