跟踪型RDC载波相位误差和输入噪声的分析及应用

Error analysis for carrier phase mismatch and noise of tracking RDC’s input signals

跟踪型轴角转换器(Resolver-to-digital Converter,RDC)被广泛应用于高速精密角度测量。首先介绍了这种方案的测量原理,总结了以往误差分析的结论,指出了其在工程应用中的不足。然后对载波相位角失配进行了误差分析,获得了误差表达式。并根据锁定放大的原理,量化了输入噪声误差的分析方法,给出了信号调理电路的最大允许增益的估算方法。分析方法及结果对基于追踪型RDC的高速精密测角系统的工程实践具有重要的意义。

Tracking resolver-to-digital converter is widely used for high-speed precession angle measuring. The measuring scheme and main errors are introduced. Then two shortages of past error analysis are pointed out for engineering application. The carrier phase mismatch error is analyzed and its expression is determined. The input noise requirement is quantified based on the theory of lock-in amplifier. The estimate method for maxim permitted gain of signal conditioning is presented. The analysis methods and quant...