基于Fuzzy ART聚类的卫星在轨姿态监测系统设计

Design of satellite attitude monitoring system in orbit based on Fuzzy ART clustering

摘要:

针对传统卫星在轨姿态监测系统无法确定在轨姿态向量与正常向量匹配度，导致卫星在轨姿态角度监测结果不精准的问题，提出了基于Fuzzy ART聚类的卫星在轨姿态监测系统设计。设计系统硬件结构，根据GPS解算方位角和俯仰角，隔离载体扰动。使用MSP430微控制器内部集成数字/模拟信号转换器，统一CPU指令和寻址模式。通过读取指令代码，完成由指令代码指定操作。使用AS5145B磁角位置编码器，保证每个单元上都能产生磁铁场强，输出脉冲信号。通过双轴磁传感器HMC6352的电磁罗盘电路，找出卫星在轨姿态大致方向。利用Fuzzy ART聚类卫星在轨姿态监测数据，确定聚类中心，判定卫星在轨姿态向量与正常向量匹配度，根据匹配结果，开辟新的记忆节点，给出报警信息，完成姿态监测。实验结果表明，所设计卫星在轨姿态监测系统在轨道圈数为1圈时施加控制力矩，能够迅速使姿态达到稳定；轨道圈数为2圈时，z轴方向的俯仰角与实际三维角度相差1°，表明该系统对卫星在轨俯仰角和方位角的监测准确率较高。

Abstract:

Aiming at the problem that the traditional satellite on-orbit attitude monitoring system cannot determine the degree of matching between the on-orbit attitude vector and the normal vector, resulting in inaccurate satellite on-orbit attitude angle monitoring results, a satellite on-orbit attitude monitoring system design based on Fuzzy ART clustering is proposed. Design the hardware structure of the system, calculate the azimuth and pitch angles according to GPS, and isolate the carrier disturbance. Use the integrated digital/analog signal converter inside the MSP430 microcontroller to unify CPU instructions and addressing modes. By reading the instruction code, the operation specified by the instruction code is completed. Use AS5145B magnetic angle position encoder to ensure that each unit can generate magnet field strength and output pulse signal. Through the electromagnetic compass circuit of the dual-axis magnetic sensor HMC6352, find out the approximate direction of the satellite's on-orbit attitude. Use Fuzzy ART to cluster satellite on-orbit attitude monitoring data to determine the clustering center, determine the degree of satellite on-orbit attitude vector matching with the normal vector, and open up new memory nodes based on the matching results, give alarm information, and complete attitude monitoring. The experimental results show that the designed satellite on-orbit attitude monitoring system can quickly stabilize the attitude by applying a control moment when the number of orbital turns is 1 turn; when the number of orbital turns is 2 turns, the pitch angle in the z-axis direction is different from the actual three-dimensional angle 1°, indicating that the system has a high accuracy in monitoring the satellite's on-orbit pitch and azimuth angles.