激光相干多普勒测速精度实验

激光相干多普勒测速雷达由于测量精度高、测速范围广、功耗体积小等优势广泛应用在风场测量、导航及飞行器着陆等方面。为了测试其测速精度,本文研制了速度发生器,搭建了高精度大速度范围的精度测试平台,利用搭建的测试平台对激光多普勒测速精度进行测量,在105.8266 m/s的速度下测得的精度为0.0383 m/s。对激光多普勒测速的精度进行了分析,提出了插值校正FFT频率、采用流水线的FFT处理方法、增加采样位数和提升采样频率等方法来提高测速精度。

Experiment of laser coherence Doppler velocimetry

The laser coherence Dopplervelocity radar is used in field measurement,navigation and aircraft landing due to its high measurement accuracy,wide range and small power consumption.In order to test its speed accuracy,in this paper a speed generator is developed,and an accuracy test platform with high precision and large speed rangeis built.The accuracy of laser Doppler velocimetry was measured using the built test platform.The accuracy was 0.0383m/s at the speed of 105.8266m/s.The accuracy of laser Doppler velocimetry was analyzed,the FFT frequency was corrected by interpolation method,and the FFT processing method of pipeline,increasing sampling number and increasing sampling frequency are adopted to improve the speed accuracy.