摘要
研究飞行器导航定位精度优化问题,由于固定天线多普勒雷达、航姿系统及导航系统等测速存在误差,引起系统导航误差。为了减小测速误差,提高导航精度,提出了一种采用安装偏差与测速精度估计的补偿方法。分析了多普勒雷达的工作原理及误差的影响因素,建立了误差模型,然后利用卡尔曼滤波器,结合误差模型,将安装偏差、测速精度作为状态变量进行了估计,最后根据估计值进行了补偿。仿真结果表明,在载机起飞、降落、平飞等飞行状态下,改进方法能准确地对安装偏差、测速精度进行估计,减小了测速误差,提高了载机在陆地及海洋上飞行的导航精度。
Velocity error is one of the main navigation error impact factors in system which comprises of Doppler radar, heading system and navigation computer. In order to reduce the velocity error and improve the navigation ac- curacy, a method of compensation was proposed based on the real - time estimation of installation drift angle and the velocity accuracy. The error model was built up after the study of the principle of Doppler radar and the analysis of the velocity error. Then the error was compensated on behalf of the values of the state parameters which are attached using Kalman Filtering. The simulation results show that this method can estimate the state variables correctly, the velocity error is reduced and the navigation accuracy is improved whether on land or at sea under normal flight condi- tions with some maneuvers.
出处
《计算机仿真》
CSCD
北大核心
2013年第4期89-92,242,共5页
Computer Simulation
基金
国家自然科学基金(U1233127)
关键词
多普勒雷达
陆地
海洋测速精度
安装偏差
误差补偿
Doppler radar
Velocity accuracy on land or sea
Installation drift
Error compensation
