An Improved Dual-axis Mirror Control Scheme for Imaging LIDAR Application

An improved dual-axis mirror control scheme for the imaging LIDAR (Light Detection And Ranging) is proposed in this paper. The scheme features that a direct drive mechanism is developed utilizing PMSMs (Permanent Magnet Synchronous Motor) and rotary resolvers to control the angular positions of x-y mirrors. The controller is composed of the standard d-q current loops and a specifically designed position loop. Thus, the capabilities of accurate scanning and high accuracy pointing and tracking are enabled, together with the enhanced laser generator, resulting in the extension of the range measurement to be as far as 25 kilometres, as well as the near-zone imaging capability. In addition, a safety mode is developed to prevent the LIDAR from interior damage. Then, the implementation of the mirror subsystem is introduced and the experimental results have validated the agreement with the requirement.