GPS／IRS伪距组合技术研究

Research on GPS/IRS Pseudo-range Integration Technology

一本文结合一典型的反舰战术导弹的中程制导任务，对ＧＰＳ／ＩＲＳ伪距组合系统进行了分析和研究．采用Ｕ－Ｄ分解卡尔曼滤波对组合系统进行了Ｍｏｎｔｅ－Ｃａｒｌｏ仿真。结果表明，ＧＰＳ／ＩＲＳ组合作为提高导航、制导精度的有效途径，可以克服纯惯性系统中存在的无界位置误差。不同的陀螺精度的仿真还表明，组合系统对一定范围内的陀螺精度的降低不敏感。（这为在进行ＧＰＳ／中等精度、低成本的航姿系统组合时降低对陀螺的精度要求提供了理论依据）

his paper analyzes and studies a navigation system by using GPS/IRS(Inertial Reference System) integration technology based on the program of developing a guidance device for a typical anti-ship tactical missile. The U-D decomposed Kalman filter is used in the Monte-Carlo simulation for this integrated system. The result shows that GPS/IRS integration technique is an effective way for improving the accuracy of navigation and guidance system,and will eliminate the boundless position er-rors that exit in all pure IRSS.The simulations for integrated system by using different gyro drifts lead to the conclusion that a system like this one is not sensitive to the reduce of the gyro's accuracy within a certain range.(This provides a theoretical founda-tion for the development of integrated system by combining GPS with a low-cost heading & attitude system and can reduce the influence due to the lower-down of the gyro's accuracy.)