Research On The Control And Daq For A Doppler Wind Lidar

The doppler wind lidar (DWL) is the only effective tool that can provide a global three-dimensional coverage of wind data. And the control system derectly effects the performance of the DWL. As the complexity of lidar systems, and requirements on the control precision and high real-time , increases the difficulty of the control system. As the laser echo signal decay quickly with distance, commonly used photomultiplier tube (PMT) with photon counting mode analog combination of detection methods, which makes data collection systems are more complex, and also make data processing more difficult.The frequency discrimination directly determines the implementation of other subsystems. This paper from the lidar detection started the overall design of the DWL control system. This paper used the virtual instrument technology to develop the control system,used a computer as the control center, as the Lab VIEW development platform, so that data transmission and data processing greatly improve the efficiency of the system. Then focus on the design of virtual instrument technology to implement the calibration of the inititial operating point of the frequency discriminationsystem based on angle-tuned dual-edge technology, realize the synchronization of the control and data acquisition , the calibration process in a short time to complete,and achieve the required control accuracy.This paper used the virtual instrument technology with SiPM as the detector, and high-speed data acquisition card as hardware core to design the DWL data acquisition and processing system,studied the response characteristics and dark counts characteristics of of the photon detector. As a basis for designing algorithms to achieve photon counting with software This allows the acquisition system greatly simplified, and provide a unified data format to facilitate subsequent wind retrieval.