文档介绍：毕业设计
中英文翻译

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探测制导与控制技术
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2012年 6月
High–Speed Data Acquisition System Based on ARM & D
Dong Jianjun Zhao Xiaojin
Dept. Four, The First Aeronautical Technical College of the Air Force Xinyang .
Abstract : This paper presents a high speed acquisition system of D based on ARM, high-speed D and high-speed ADC are selected. As the sampling speed of A/D is slower than the working clock frequency of ARM, CPLD and FIFO are used as I/O between A/D and ARM. It makes the circuit works harmonious, simple and easy controlling, and also increases the efficiency of ARM. In order to increase munication speed, the Universal Serial Bus (USB) technology is adopted municate with the PC. ARM is the key processor utilized to control the data sampling, pute and data transfer. As a result, the whole system works effective. The system can be applied to the high speed data acquisition and operation situations from multi-channel analog signals.
Key Words : ARM; D; Contact-line; Pantograph; Stagger –value
I. Introduction
In electrification railways, in order to extend the life of the pantograph on electric otives, so that the slider of pantograph wear evenly, the contact-line (electrified railway power feed line) in straight-line segments is arranged as zigzag route (curve section arranged in the form of polyline). The distance between the contact-line of positioning point and the pantograph centerline track is called out stagger-value, which is a key indicator of contact-line .
Stagger-value can not be ignored, the value too small will affect the slider of pantograph wear evenly and the purpose of extending using life; otherwise, in some cases (such as caught in a stiff winds), cause a large range of lateral movement of the roof (and the higher the speed, the greater pantograph swing around), some parts of contact-line will be in excess of the effective work length of pantograph, so that the stagger-value of contact-line beyond the