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脉冲星自主导航技术能够提供连续、高精度的导航定位信息和高精度的时间标准,能为深空和星际飞行器的自主导航提供有效技术支撑。针对如何提高环火探测器自主导航的精度,并为其提供快速、可靠的导航信息,本文设计了一款自适应扩展卡尔曼滤波器(AEKF)滤波器。仿真数值实验表明,探测器的三个轴向位置精度能够迅速收敛,X轴向收敛精度优于1 000m,Y、Z轴向收敛精度优于350m;三个轴向速度精度也能经过数十个历元后稳定在0.05m/s以内。此外,AEKF能够有效克服滤波初始状态偏差的影响,较快地获得相当精度的状态估值。
Pulsar autonomous navigation technology can provide continuous, high-precision navigation and positioning information and high-precision time standard, which can provide effective technical support for autonomous navigation of deep space and interstellar aircraft. Aiming at how to improve the accuracy of autonomous navigation of ring fire detectors and provide them with fast and reliable navigation information, this paper designs an adaptive extended Kalman filter (AEKF) filter. Simulation results show that the accuracy of the three axial positions of the detector can converge rapidly, the accuracy of X-axis convergence is better than 1 000m, the accuracy of Y-axis and Z-axis convergence is better than 350m, and the accuracy of three axial velocity can also go through dozens A calendar after the stable at 0.05m / s or less. In addition, AEKF can effectively overcome the influence of the initial state error of the filter and obtain relatively accurate state estimates quickly.