A constrained LAMBDA method for GPS attitude determination
A constrained LAMBDA method for GPS attitude determination
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DOI：
10.1007/s10291-008-0103-2
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发表时间：
2009-03-01
期刊：
影响因子：
4.9
通讯作者：
Shen, Jun
中科院分区：
文献类型：
--
作者：
Wang, Bo;Miao, Lingjuan;Shen, Jun
提出了一种GPS姿态确定中固定整周模糊度的改进方法。当浮点解及其方差-协方差矩阵不够精确时，利用已知条件作为约束来获取姿态信息。首先扩大搜索椭球区域以补偿浮点解不精确所引起的误差。然后利用这些约束条件将模糊区域缩小到一个合适的大小，从而保持真实的整周模糊度。实验结果表明，与无约束模糊度确定方法相比，该方法具有搜索速度快、确定模糊度成功率高等优点。姿态角的精度也得到了提高。
An improved method to obtain fixed integer ambiguity in GPS attitude determination is presented. Known conditions are utilized as constraints to acquire attitude information when the float solution and its variance-covariance matrix are not accurate enough. The searching ellipsoidal region is first expanded to compensate for errors caused by the inaccurate float solution. Then the constraints are used to shrink the region to a proper size, which maintains the true integer ambiguity. Experimental results demonstrate that this scheme gives a fast search time and a higher success rate in determining the fixed integer ambiguity than the unconstrained method. The accuracy of attitude angles is also improved.