无陀螺SINS/GPS组合导航系统研究

【作者】 赵霞；

【导师】 高社生；

【作者基本信息】 西北工业大学 ， 导航、制导与控制， 2006， 硕士

【摘要】 无陀螺捷联惯性导航系统主要由加速度计组成。该系统舍弃陀螺仪,用加速度计代替陀螺仪作为惯性测量元件,这不仅可以克服陀螺无法承受大的加速度冲击的缺点,而且可以减小体积,大大降低成本。该系统具有成本低、功耗小、寿命长、可靠性高、抗过载等优点,可以广泛用于军用与民用。无陀螺捷联惯性导航系统是中等精度的导航系统,由于误差积累快,所以在该系统中引入GPS,将两种导航系统进行组合。用GPS测得的导航信息校正无陀螺捷联惯导系统的导航参数误差,提高导航精度,并且可以用于长时间导航。 论文的创新性研究和主要工作如下: (1)根据无陀螺捷联惯性导航系统的工作原理,提出一种新的九加速度计安装方案。该方案设计简单,不仅便于加速度计安装,而且可以提供加速度计的冗余信息,便于载体角速度的解算。 (2)采用三种解算方法进行载体角速度解算。其中方法一直接对解算出的角加速度积分;方法二通过解算出的角速度平方项开方;方法三利用扩展卡尔曼滤波对解算出的角速度进行校正。经过扩展卡尔曼滤波算法校正后,可有效地提高载体角速度的解算精度。 (3)研究并推导出沿坐标轴向的加速度和角加速度误差,根据无陀螺捷联惯导系统的力学编排方程,推导出系统误差方程。 (4)对无陀螺SINS/GPS组合导航系统进行了研究,利用卡尔曼滤波器进行导航参数的误差估计和反馈校正,有效地抑制了导航误差的累积,提高了导航系统的定位精度。 最后,对低成本无陀螺SINS/GPS组合导航系统进行了仿真研究,解决了无陀螺捷联惯导系统角速度解算及组合导航系统应用中的一些技术问题,为该系统走向工程实践提供了一定的理论依据。仿真结果表明:组合导航系统的具有较高的导航精度。更多还原

【Abstract】 The gyro-free strapdown inertial navigation system(GFSINS) is only composed of accelerometers in which gyroscopes are not used. Using accelerometers instead of gyroscopes as the inertial measurement unit not only overcomes the demerit that gyroscope is difficult to support the large angle motion, but also reduces the volume and falls the price abruptly. The GFSINS has the advantage of low cost, low power consumption, long time running, high reliability, strong over loading and is widely applied to the military and the civil. The GFSINS is a navigation system of medium precision. An absence of gyroscopes leads to the accelerated growth of errors and the required levels of precision hard to achieve in short time, so the integrated navigation system of GFSINS and GPS is used. During motion the navigation parameter errors are adjusted by the data obtained from GPS, which meet the accuracy and time requirements for navigation systems.The innovative study and main work of the thesis are as follows:First, according to the work principle of the GFSINS, a new configuration of nine accelerometers is proposed. The design of the configuration is simple, which provides the redundant information of accelerometers and is benefit to the calculation of angular velocity.Second, three solution methods to solute the angular velocity of the carrier are adopted. The first method is to integrate the angular acceleration directly. The second is to extract the square of the angular velocity. The third is to adjust the angular velocity by the extend Kalman filtering algorithm, so as to improve the calculative accuracy of the angular velocity of the carrier.Third, the error of the axial acceleration and the angular acceleration are studied and formulated. According to the mechanical calibration equations of GFSINS the error equation of the system is derived.Forth, the GFSINS/GPS integrated navigation system is studied. The Kalman filtering algorithm is used to make the error estimation and feedback adjustment, the accumulation of the navigation error is inhibited and the positioning accuracy of the navigation system is improved.Finally, the low-cost GFSINS/GPS integrated navigation system is studied by simulation, which solves some technique problems in the application of solution of theangular acceleration in GFSINS and integrated navigation system. Simulation results show that the integrated navigation system has high navigation accuracy.更多还原