Based On Non-uniform Sampling Of High-speed Data Acquisition System Design

Digital signal processing technology has been dramatically developed in recent years, which makes it to be the primary method in signal processing. Data acquisition, i.e. the transformation from analog signals to digital signals, is highly important in high speed digital signal processing because of its significant improvement for the signal processing.Traditional data acquisition gets analog magnitudes such as voltage, temperature, pressure, displacement, and transforms them to digital ones to store and process through digital processors. With the development of integrated circuit design and manufacturing technology, the sampling ratio to mono-chip A/D is highly increased and up to GHz. But the same technology limits the sampling ratio to a practical level, other methods must be developed on the condition of given sampling rate.This thesis focus on high quality parallel sampling of high speed data through non-uniform sampling and DSP technology, some important techniques in this field are given in this thesis: comparing the uniform sampling with non-uniform ones based on sampling theory, analyzing the difference, and proposing the unique advantages of non-uniform sampling; Research has been done on signal reconstruction of uniform and non-uniform sampling, proposed two respective new methods to realize high speed digital signal reconstruction; Developed a real non-uniform sampling system based on FPGA and DSP. After signal processing, data get through parallel sampling can be printed on the screen. We can validate non-uniform method and its algorithms through this; Analyzing and summarizing of current system issues, propose next work expectation.