SiGe半导体公司推出采用创新结构的GPS解决方案SE8901,该芯片在4×6mm封装内,集成了GPS无线射频、GPS处理加速器、高性能片上低噪声放大器和图像抑制混合器。该器件所附带的软件可支持多种安全和导航服务,但不会导致主处理器过载。SE8901和软件具有SilentTracking及其他先进的电源管理特性,可确保用户即时获取准确的定位信息,而不会影响手机电池的使用寿命。
本文在分析对流层延迟对GPS精密定位影响的基础上 ,研究了采用高度角加权模型 ,并同时估计天顶延迟和水平梯度参数的方法 ,设计了数据处理方案 ,然后利用IGS数据 ,采用GAMIT软件进行分析解算 ,验证了这种方法的有效性 ,得出了一些有用的结论。
大范围GPS水准拟合模型 ,必然存在模型误差 ,考虑模型误差 ,如何选取GPS水准的拟合模型是本文讨论的主题。文中通过一个大测区GPS水准实测数据 ,说明拟合模型优选准则的应用以及具体分析方法。
In the remote sensing survey of the country land, cost and accuracy are a pair of conflicts, for which spatial sampling is a preferable solution with the aim of an optimal balance between economic inp
Based on the improved interaction mechanism of two-layer model, this paper proposed Pixel Component Arranging and Comparing Algorithm (PCACA) and theoretically positioning algorithm, estimated the tru
Objective: To investigate the effect of platelet membrane glycoprotein(GP) Ⅰa gene polymorphism in the pathogenesis of unstable angina pectoris (UAP) in Chinese people. Methods: Collagen type Ⅰ-induce
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