INS辅助整周模糊度单历元直接解法

INS Aided Direct Calculation Algorithm for Single-Epoch Ambiguity Resolution

提出了一种无须进行搜索的单历元模糊度解法。首先,选择4颗基本卫星,使用INS位置坐标估计这些卫星各频点整周模糊度参数值;构建(1,-1)和(-3,4)组合模糊度,对(-3,4)组合模糊度进行多项式拟合,得到电离层延迟误差估值并进行误差补偿,削弱电离层误差等系统性影响后,直接取整固定组合模糊度;利用组合模糊度确定各频点模糊度后,回代求解接收机坐标,基于此坐标直接固定其他卫星各频点的模糊度。采用实测GNSS/INS数据对算法实现了有效性验证。

A single-epoch ambiguity resolution algorithm without a search process is proposed.Four basic satellites are selected,whose integer ambiguities are estimated by using the INS position,then（1,-1）and（-3,4）ambiguity combinations are formed.The ionospheric error of the（-3,4）combination is polynomially fitted.After systematic influences such as the ionospheric error are compensated,the ambiguity combination can be fixed by simple rounding.The ambiguities of each frequency can be determined by the combination and returned to resolve the receiver position.Based on the receiver position,the ambiguities of all other satellites can be calculated directly and fixed by rounding.The algorithm was validated by field test GNSS/INS data.