为了实时且精确地获取飞机相对于着陆点的位置坐标,在深入分析机场场地位置几何信息和地面设备制导信息并建立坐标变换测量方程的基础上,提出了一种基于坐标系旋转的旋转坐标迭代解算算法；该算法通过坐标系的旋转消除了飞机纵轴方向上的位移,而后研究其具体迭代解算过程,并通过仿真进行算法性能分析；将所提出的旋转坐标迭代解算算法在TMS320F2812 DSP上进行实现,并利用集成开发环境(CCS)进行调试与仿真；结果表明:旋转坐标迭代解算算法收敛快速且精确度高,DSP实现的旋转坐标迭代解算算法所得坐标值与软件仿真结果基本一致,满足系统性能指标要求,对于无人机着陆制导信息的获取具有实用价值.%In order to obtain real-time and precise airplane position relative to the touchdown point, a rotational coordinate iterative al-gorithm based on coordinate rotation was presented to solve the measurement equations. Through rotating coordinates, coordinate on the vertical axis was eliminated in this algorithm. Then, the concrete iterative process was achieved. Through simulation, the results using the algorithm were analyzed to verify its performance. The proposed rotational coordinate iterative algorithm was implemented on the DSP chip and the performance was analyzed. Comparison of them showed that the rotational coordinate iterative algorithm performed well in convergent speed and accuracy. The implemented algorithm could meet the system standards. Moreover, it was of practical value in acquiring guide information.
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