基于局域GPS的飞机惯性导航部件安装校准

Installation and Calibration of Airplane Inertial Navigation Based on Indoor GPS

对基于局域GPS的惯导安装校准测量点布设和激光发射器位置标定方法进行了研究。在对局域GPS测量不确定度分析的基础上,给出了满足惯导安装精度要求需安装激光发射器数量的计算公式。通过建模分析了局域GPS的测量精度,分析结果表明测量精度与接收到的激光发射器信号数量、激光发射器姿态及其相互位置等因素有关,当两发射器距离小于20 m,测量方位角在10-70°之间,局域GPS可获得较高的测量精度。最后阐述了基于局域GPS的惯导安装校准工艺步骤。应用表明：安装5个激光发射器,测量距离小于5 m,校准精度和效率均得到提高。

To develop a new process of the installation and the calibration of airplane inertial navigation based on the indoor GPS, the layout of measuring points and the transmitter calibration method are described. On the basis of the analysis of indoor GPS measurement uncertainty, the formula of the necessary transmitter number is proposed. The measurement precision is analyzed by the measurement modeling. The analysis result shows that the precision is related with the transmitter number, the transmitter attitude and the connection of their positions. The precision is improved as the transmitter number is increased. The error reduces greatly while the distance is less than 20 m and the azimuth angle is between 10° and 70°. Finally, the steps of the new method are presented. The application results show that the efficiency and the precision are improved when five transmitters are installed and the distance between the transmitter and the measuring point is less than 5 m.