零校正

Accelerometer ; zero setting ; correction

加速度计；调零；校正

The three methods which are crossing zero method and DFT algorithm method and correlation analysis method in phase difference measurement are introduced in this paper.

针对相位差检测的过零法、DFT谱分析和相关分析法，阐述了算法的检测原理与仿真计算，讨论了相位差检测方法所产生的误差及误差校正方法。

To perform CRS stack depends on the determination of three wave attributes,compared with conventional common middle point stack and dip move out stack,CRS stack can focus more energy in the vicinity of the reflector,therefore can obtain a better zero offset section by stacking events with same phase.

共反射面元的旅行时响应由三个波场属性参数确定，相比常规共中心点(commonmiddlepoin ，CMP)叠加和倾角时差校正(dipmoveout，DMO)叠加，CRS叠加算子能够将地下反射点附近一个邻域内的能量进行聚焦并实现同相叠加，因此能得到更好的零炮检距剖面。

By using VSP data,spherical spreading amplitude compensation factor was estimated.

通过分析VSP资料，求取球面扩散振幅补偿因子；对VSP走廊叠加剖面与地震资料进行匹配分析，优选反褶积参数；通过分析零偏VSP资料，计算时变Q因子；对地震资料进行时空变Q分析，并由VSP资料进行校正，得到时变Q补偿因子。

According to wideband mission data protocol, the paper finishs such work as identifying synchronization codes、inverting pseudo randomizer、 unwrapping data packages. Then, According to ETM+mission data formats, imaging data and parameters used in calibration are extracted, and inputed into files.

根据其宽波段任务数据协议和ETM+任务数据格式，论文工作完成了数据的解同步、解扰、解包等步骤，并提取得到图像数据和用于辐射及几何校正的参数，最终输入到相应文件中，生成零级产品。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。