基于FPGA的時間測量電路的研究
[Abstract]:Time measurement circuit is an important part of X-ray pulsar navigation. The time of this time is obtained by using the collected X-ray pulse as trigger signal. The time precision reaches 1ns and the range reaches 1999. It has the characteristics of high precision and wide range. In this paper, the time measurement circuit is designed by using the whole hardware design mode based on FPG A and the combination of coarse time and fine time. Gross time using Graycode counter for year, month, day, hour, minute, second design. The IODELAY primitive provided by Xilinx Company is used to design the time below the main frequency. Finally, the time measurement circuit of 1ns is achieved, and the time data of the time measurement circuit is transmitted to the host computer by USB chip CY7C68013A to restore the superposition pulse profile of epoch. The time measurement circuit in this paper is based on the cooperative project of X-ray pulsar navigation of Xi'an Optical Machine Institute of Chinese Academy of Sciences. Time measurement circuit is an important part of X-ray pulsar navigation back-end circuit, the front-end circuit is developed by Xi'an Optical Machine. At this stage, all the research is based on the ground simulation system. The whole X-ray pulsar navigation ground simulation system includes: X-ray signal generator, vacuum system, MCP detector, front-end shaping amplifier circuit, time measurement circuit and USB transmission. The transmission of time measurement circuit and USB is the research content of this paper. In this paper, an integrated X-ray pulsar ground simulation system is used to carry out the test, and the test results are transmitted to the upper computer by USB to restore the pulse profile. The similarity between the restored pulse profile and the pulsar profile downloaded in NASA is 95.38, which meets the requirements of the project. But this method is not convenient for real-space navigation because of its poor real-time performance. According to the real-time requirement, pulsar navigation based on Linux system becomes the main research object in the next stage, so the whole time measurement circuit and the subsequent pulse restore can be integrated into the Linux system. Convenient for real-time processing of time measurement circuit data to complete accurate navigation work. In the last chapter, the ZedBoard development board is introduced, its working steps, possible problems and solutions are explained, and the coordination between ARM and FPGA is accomplished by transplanting the Linux system to the ZedBoard development board. For the development of the follow-up work played a role in paving the way.
【學位授予單位】:昆明理工大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:V448.2
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