The localization principle of bistatic sonar is given and the gdop ( geometry dilution of precision ) which used in bistatic radar for describing the localization error has been cited in bistatic sonar 在对双基地声呐定位原理和定位误差分析的基础上，提出了用定位精度的几何解释( gdop )来表征双基地声呐定位误差的方法。
In this paper , the gdop ( geometric dilution of precision ) expression of area navigation system is deduced . using the matrix theory the lowest gdop and that gdop is smaller with more navigation stations are proved in theory 本论文推导了区域导航定位系统的几何精度因子,并用矩阵理论对其最小值及其随导航台个数增加而减小进行了证明。
These analysis is based on a great deal of test . some conclusion is : geometry dilution of precision and the number of satellites can be used to pick out some abnormal points . to group the data according to the vertical dilution of precision can also pick out some abnormal points 通过对ag132大量实验和精度分析，提出了可以通过gps信号接收时的几何精度因子、卫星个数等首先剔除浙江大学博士学位论文摘要一批gps信号中的异常值，然后可以通过垂向的按几何精度因子分组判别法剔除一些异常值。
By means of establishing the mathematical model of gps integrated navigation system , it studies geometrical dilution of precision ( gdop ) and kalman filter . we simulate them by supplying to some examples . simulation result has shown the practicality of the algorithm 通过建立gps / sins组合系统的数学模型，从几何精度因子gdop的物理意义和卡尔曼滤波对状态估计的基本原理出发，并结合实例的仿真计算结果，讨论了gps / sins组合导航系统定位和测速精度与gdop的关系。
Its main contributions include the following several aspects : firstly , the dissertation constructs the mathematic model of short baseline orientation determination using two geostationary satellites and analyses the applicable conditions of carrier phase interferometry . orientation determination precision is analysed in depth through both the conventional linearized method and monte - carlo computer simulation method , and the mathematical simulation results show that the linearized method has the shortcoming of fairly low elevation error analysis precision in high latitude area so as not to be very appropriate there . by analyzing the definite factors influencing orientation precision , the dissertation develops the concept of orientation dilution of precision , which uncovers the internal cause of exotic error behavior of bi - satellite orientation , and has important guiding significance for practical engineering applications 本文系统地研究了基于“北斗一号”卫星载波相位干涉测量原理实现地球静止双星定向的相关技术,主要研究成果包括以下几方面:首先,建立了利用两颗地球静止轨道卫星进行短基线定向的数学模型,分析了载波相位干涉测量的适用条件;采用传统的线性化解析法及蒙特卡洛随机模拟法两种途径对双星定向的精度进行了详细分析,数学仿真结果表明在高纬度地区线性化解析法由于俯仰角误差分析精度略有下降而不太适合;在分析定向精度确定性影响因素的基础上,提出了双星定向精度衰减因子odop的概念,揭示了双星定向误差特殊表现的内部机理,对实际工程应用具有重要的指导意义。
