| Quick and precise measurement of angular displacement is applied in the areas of aviation, spaceflight, shipping, and nation defending for the adjustment of the attitude and orientation of engineering objects, or for the reliable detecting of the angular displacement performance. Thus the angular displacement measurement system is a key component of the corresponding system. Also, it is widly used in control systems.According to the background, purpose and significance of the research topic,the paper introduces the development of angular measurement technology,and put forward to an low-cost and amplitude discrimination mode angle measurement system which constuct by resolver,shaft-digital converter and DSP through comparing and analysising all the measurement methods.The system can sample the dynamic angular displacement measurement between 0 to 360 degrees,and use serial RS-232 to communicate with PC which can realize absolute-and-relative angle outputting.The system's software is programed by the C and the assembly language which is used modularized design to make it easy to be modified and upgraded.Errors of the system are analyzed.Various factors which can cause the measurement errors are pointed out and mathematical expressions for these errors are deduced.In this way,a reliable basis was provided for reducing the measuring errors and improving the accuracy of angular displacement measuring system.And some ways which can restrain or compensate these errors are introduced.The mathematical model of angular displacement measuring system is given in this paper on the base of analysis of the system's construct. Accrording to simulating the position,speed,accelerration input signal and analyzing the dynamic characteristic of the system,it is certificated that the system is a 2nd mode system.Finaly,the debugging for hardware and software is finished.The experiment result indicate that the system can reliably be operated and have high real time ability.
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