摘要：由于旋转变压器精度高、环境适应能力强，更适合用于振动较强、灰尘较大的场合。然而，旋转变压器的输出是包含角位置信息的调幅信号，必须进行检波和解调。为同时获取电机转子角位置及角速度信息，设计了一种基于状态观测器的解调算法。分析了算法中未建模动态对解调误差的影响以及算法对量测干扰的抑制能力。在此基础上，给出了观测器增益整定规则。与反正切法相比，由于该算法不需通过数值差分即可获得角速度信息，避免了对误差的放大作用，具有较强的干扰抑制能力。实验结果表明，该算法是可行的。

关键词：车载装置；伺服电机；旋转变压器；状态观测器
Abstract: Resolver is more suitable as position sensor of servo motor which worked on the strong jolt and dust circumstance, because of its characteristics of high accuracy and strong adaptation to circumstance. But the analog outputs of the resolver must be detected and demodulated, as they are amplitude modulated signals that contain the angular position information. In order to obtain the rotor angular position and velocity information, a resolvertodigital conversion (RDC) algorithm based on state observer was presented. The algorithms demodulated error caused by unmodeled dynamics and algorithms ability to reject measure disturbance was analyzed. Based on these, a method about how to select observer parameter was suggested. Compared with the arctangent algorithm, the proposed algorithm dont amplify the angular velocity tracking error, because it can obtain angular velocity without needing  differential operator, thus has a strong ability to suppress disturbances. Experimental results indicate that the demodulation algorithm present above is feasible.

Key words: vehicle device; servo motor; resolver; state observer