dlmcfpt.c1

The DLMC VAP uses inertial data from the ARM NAV system to transform the Doppler lidar beam angles (az and el) from the lidar's frame of reference to an Earth-fixed frame such the azimuth angle is measured clockwise from true north and the elevation angle is measured from the local horizon. Additionally, the VAP compensates the observed radial (air) velocity data for the effects of the platform velocity (i.e. corrected_radial_velocity = observed_radial_velocity-platform_radial_velocity). The VAP was developed specifically for MOSAiC. The dlmcfpt.c1 product contains the fixed point, or staring data. The dlmcusr.c1 product contains a user defined scan which is anything the operator wants it to be.

DLMC VAP依托ARM导航系统（ARM NAV system）采集的惯性数据，将多普勒激光雷达（Doppler lidar）的波束角（方位角az与仰角el）从激光雷达自身参考坐标系转换至地固坐标系（Earth-fixed frame），其中方位角以真北为基准顺时针计量，仰角则以当地水平面为基准起算。此外，该VAP还对实测径向（大气）速度数据进行了观测平台径向速度效应的校正，校正公式为：校正后径向速度 = 实测径向速度 - 平台径向速度。本VAP专为MOSAiC科考项目开发。其中dlmcfpt.c1产品包含定点（或凝视）观测数据，dlmcusr.c1产品则包含用户自定义扫描数据集，支持操作员自定义任意扫描方案。