The Hardware Design And Implementation Of The Test System Of Acousto-optic Signal Processing

Based on acousto-optic signal processing technique, the hardware circuit of the test system of acousto-optic signal processing was designed and implemented in the thesis; the software programs were developed, and the system hardware was debugged and examined.The acousto-optic frequency synthesizer was designed to drive the Bragg device. In the four kinds of frequency synthesizers, the synthesizer with DDS+PLL structure was selected to meet the requirements of the system. The acousto-optic frequency synthesizer was mainly composed of DDS, PLL, RF switch, mixer, bandpass filter, variable gain amplifier and power amplifier module. During the design of the frequency synthesizer circuit, the phase noise of PLL was simulated in ADS for reference. In addition, the electromagnetic compatibility(EMC), signal integrity and power integrity of the circuit were taken into consideration when designing the printed circuit board(PCB).On the basis of acousto-optic spectrum analyzing, acousto-optic correlation processing and the acousto-optic signal processing system proposed by the research group, the acousto-optic signal post-processing system was presented in the thesis, which consisted of the FPGA digital signal pre-processing module, the DSP digital fine-processing and communication module, the FPGA data display module. Verilog programs were developed to realize the function of CCD, A/D converter, LCD, SDRAM. The DSP initialization program and the programs of Ethernet controller and USB controller was developed with C language.The acousto-optic Bragg diffraction experiment was conducted at the end of the thesis, in which acousto-optic frequency synthesizer and siganl post-processing system were debugged together. According to distribution of the position of Bragg diffraction light under different frequencies, the conclusion that the acousto-optic signal processing test system designed in this thesis was available was generalized.