Phase-lag-free low pass filter with higher-order sensors and its application in motion control

Signal filters are the foundation of many industrial fields, especially in high-performance motion control. However, commonly used low-pass filters exhibit serious phase lag, which degrades the performance of the whole system. This paper proposes a filter method that uses information from higher-order sensors. The proposal is an interfusion of several sensors. This method is based on the idea of pole-zero cancellation. Statistical data of the noise are not required, which improves the feasibility of the proposed method. Moreover, the basic idea can be extended to nonlinear situations. The proposed method achieves satisfactory noise suppression without significant phase lag. This characteristic guarantees the realization of robust motion control with good performance. Simulation and application experiments in motion control system confirm its validity.