多波束测深数据系统误差的削弱方法研究

在多波束数据处理中，系统误差一般很少被顾及，部分文献采用两步滤波法削弱了系统误差的影响，但所建模型的可靠性较差。半参数(非参数)法在系统分析了测深数据系统误差来源以及各误差源间相互比例关系的基础上，对系统误差进行分解，确定系统误差各贡献成分的函数模型；根据估计点位，结合已确立的模型，计算各贡献成分对系统误差的贡献量；综合各贡献量，获得估计点深度的系统误差，进而在原始深度数据中消除系统误差的影响。     

A study on deep structure using teleseismic receiver function in Western Yunnan

1 Tectonic environment and geophysical background There are two kinds of continental-oceanic contacts relationship: the Atlantic and the Pacific type. The Atlantic type is characterized by extension and lower relative activity. The continent nearby the ocean is stable and its edge is of extension and block tectonics. Europe, Africa and American belong to this kind. The Pacific type is characterized by compression and shear com-pression. The continent near the ocean is more active than othe…     

Data Fusion Technique for Multibeam Echosoundings

1　ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓｍｕｌｔｉｂｅａｍｅｃｈｏｓｏｕｎｄｉｎｇｓｙｓｔｅｍｓ,ｅｓｐｅｃｉａｌｌｙｓｈａｌｌｏｗ＿ｗａｔｅｒｍａｐｐｉｎｇｓｙｓｔｅｍｓ,ｈａｖｅｂｅｅｎｄｅｖｅｌｏｐｉｎｇｒａｐｉｄｌｙｆｏｒｖａｒｉｏｕｓａｐｐｌｉｃａｔｉｏｎｓ .Ｔｈｅｍａｉｎｍｏｔｉｖａｔｉｏｎｆｏｒｇｏｉｎｇｆｒｏｍｓｉｎ ｇｌｅｂｅａｍｅｃｈｏｓｏｕｎｄｉｎｇｔｏｍｕｌｔｉｂｅａｍｅｃｈｏｓｏｕｎｄｉｎｇｉｓｔｈｅｃａｐａ ｂｉｌｉｔｙｏｆｐｒｏｄｕｃｉｎｇｍａｐｓｏｆｍｕ…     

Fine S wave velocity structure beneath Iwate volcano, northeastern Japan, as derived from receiver functions and travel times

A genetic algorithm inversion of receiver functions derived from a dense seismic network around Iwate volcano, northeastern Japan, provides the fine S wave velocity structure of the crust and uppermost mantle. Since receiver functions are insensitive to an absolute velocity, travel times of P and S waves propagating vertically from earthquakes in the subducting slab beneath the volcano are involved in the inversion. The distribution of velocity perturbations in relation to the hypocenters of the low-frequency (LF) earthquakes helps our understanding of deep magmatism beneath Iwate volcano. A high-velocity region (dV_S/V_S=10%) exists around the volcano at depths of 2–15 km, with the bottom depth decreasing to 11 km beneath the volcano’s summit. Just beneath the thinning high-velocity region, a low-velocity region (dV_S/V_S=−10%) exists at depths of 11–20 km. Intermediate-depth LF (ILF) events are distributed vertically in the high-velocity region down to the top of the low-velocity region. This distribution suggests that a magma reservoir situated in the low-velocity region supplies magma to a narrow conduit that is detectable by the hypocenters of LF earthquakes. Another broad low-velocity region (dV_S/V_S=−5 to −10%) occurs at depths of 17–35 km. Additional clusters of deep LF (DLF) events exist at depths of 32–37 km in the broad low-velocity zone. The DLF and ILF events are the manifestations of magma movement near the Moho discontinuity and in the conduit just beneath the volcano, respectively.     

Ashtech MDXII GPS接收机周期性零基线检验的结果分析

本文首先阐述GPS接收机检验工作的重要性，接着说明零基线检验的方法和目的，提供AshtechMDXII周期性零基线检验成果，并对它们进行了分析，在此基础上提出若干结论和建议，以期推动GPS接收机检验原理、方法的发展．     

PC104串行通信的应用

作者在文中详细阐述了PC104工控机串口的结构和工作机理，探讨了UART异步通信适配器的结构组成，并把该串口通信应用于MCA上，使数据采集仪器结构简单、轻便、体积缩小，便于携带和现场采集应用。     

双频GPS接收机Legacy在1∶20万区域重力调查中的应用

本文详细地介绍了 Legacy双频接收机的野外试验情况及在 1∶ 2 0万区域重力调查工作中的应用