遥测数据高精度采集存储装置关键技术的研究与实现

发布时间：2018-01-30 19:13

本文关键词： 数据采集信号调理高精度可靠性回收效率　出处：《中北大学》2017年硕士论文　论文类型：学位论文

【摘要】：遥测数据采集存储装置用来采集并存储弹上的各类信号,如飞行状态数据、摄像压缩数据、各种传感器信号等。随着科技水平的发展,科研试验对采集存储系统的功能多样性及性能优化提出了更高的要求。本文结合遥测数据高精度采集存储装置的各项技术指标,按照模块化的思想提出了设计方案,对设计中的技术难点进行了分析。首先对运算放大器的不稳定性分析与优化进行了研究,设计了信号调理滤波电路、高速模拟开关切换及ADC转换电路;依据技术指标完成了数字量传输电路和控制开关转发电路的设计;分析了系统中二次电源的功率需求,对二次电源电路进行了可靠性研究与设计。其次,针对设计中采用的提高采集精度、数模混合编帧、无线备份数据的动态平衡编帧、实时数据快速数据回收等关键技术了进行了详尽的论述。为了提高采集精度,提出通过FPGA控制ADC对输入信号进行过采样,然后在FPGA内部实现抽取滤波和求平均值算法,提高了ADC转换分辨率;采用数模混合及动态平衡编帧技术来提高采集存储的效率和可靠性;分析不同的数据回收方式,提出实时数据快速回收的方法,以提高数据回收效率。文章最后对过采样情况下所获取的样本数据绘制的直方图和高斯曲线,由MATLAB对样本的均值、标准差进行了计算,验证了采集精度满足设计指标要求;通过上位机对回收数据的帧结构进行了分析验证,证明了数据传输的可靠性和完整性;最后对实时数据两种不同的回收方式进行了分析比较,体现出新方法对回收效率的提高。
[Abstract]:Telemetry data acquisition and storage device is used to collect and store all kinds of signals on the bomb, such as flight state data, video compression data, various sensor signals, etc. With the development of science and technology level. Scientific research experiments put forward higher requirements for the functional diversity and performance optimization of the acquisition and storage system. This paper combines the various technical indicators of the high-precision acquisition and storage device of telemetry data. According to the idea of modularization, the design scheme is put forward, and the technical difficulties in the design are analyzed. Firstly, the instability analysis and optimization of the operational amplifier are studied, and the signal conditioning filter circuit is designed. High speed analog switch switching and ADC conversion circuit; According to the technical specifications, the design of digital transmission circuit and control switch forwarding circuit is completed. The power requirement of secondary power supply in the system is analyzed, and the reliability of the secondary power supply circuit is studied and designed. Secondly, aiming at improving the acquisition accuracy, digital-analog mixed framing is adopted in the design. The key technologies such as dynamic balance framing of wireless backup data and fast data recovery of real-time data are discussed in detail in order to improve the acquisition accuracy. It is proposed that the input signal is oversampled by ADC controlled by FPGA, and then decimated filter and average value algorithm are implemented in FPGA, which improves the resolution of ADC conversion. The efficiency and reliability of acquisition and storage are improved by using digital-analog mixing and dynamic balance framing technology. Different data recovery methods are analyzed, and real-time data recovery methods are proposed to improve the efficiency of data recovery. Finally, the histogram and Gao Si curve of the sample data drawn under the over-sampling situation are analyzed. The mean value and standard deviation of the sample are calculated by MATLAB, and the accuracy of the collection is verified to meet the requirements of the design index. The frame structure of the recovered data is analyzed and verified by the upper computer, and the reliability and integrity of the data transmission are proved. Finally, two different methods of real-time data recovery are analyzed and compared, which shows that the new method can improve the recovery efficiency.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP873

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