Research Of Weak Signal Measurement System Based On Chaotic Theroy

As the core of nonlinear scientific research, chaotic theory has important the academic and practical meanings. People have made great progresses in the discussion of chaotic theory and application of chaotic project in recent 20 years. The measurement by applying parameter sensitive of chaotic theory is a newer way of weak signal measuring. Some profound understanding and research results of chaotic theory in other fields are absorbed in this thesis which based on domestic and foreign research of the chaotic theory. The thesis also introduces the theory of weak signal measurement system based on chaos, and together with digital mixed analog circuit knowledge and MicroController Unit (MCU) technology, we design a measurement of weak signal measurement based on parameter sensitive of chaos, we hope the thesis can give some preliminary research on weak signal measurement with chaos.In this thesis, based on the model of saw-tooth mapping of chaos, and adopting the description of sign dynamics, the complexity of chaotic system is decreased. At the same time, we build the weak signal measurement system model based on chaos, and according the analysis of simulation the research of measure range, system time, resolution and linearity have been carried out. The computer numerical simulation result shows that the ideal resolution can reach 10?8 and the max and least deviation between actual orbit distant and ideal orbit distant are 0.0527 and 0.0032 when the computer effective digit is 15 digit float number. At the same time, the chaos measurement system circuit is designed, and the effects of offset voltage, offset current and switching delay in chaotic circuits as well the improvements of system are also discussed in this paper.Now the theory of weak signal measurement using chaos is not very clear, but its outstanding features such as high linearity and high sensitive fit for measuring are attracting more and more people plunge into.