基于北斗三频宽巷组合的RTK单历元定位方法

Single epoch algorithm of short baseline RTK based on triple-frequency wide-lane combination of BDS

为发挥北斗三频超宽巷或宽巷模糊度易于固定的优势,提出一种利用宽巷观测值的北斗单历元定位方法。首先使用载波伪距组合求解最容易固定的(0,-1,1)组合模糊度,其次基于模糊度已固定的(0,-1,1)组合观测值通过CIR方法单历元求解第二个宽巷模糊度(1,-1,0)组合模糊度。(1,-1,0)组合观测值噪声和电离层延迟综合影响最优,因此基于(1,-1,0)组合观测值进行单历元坐标解算。实验结果表明,文中提出的单历元定位方法,能够依据单历元数据最终成功解算出地面点坐标,统计精度为平面2.2cm,高程5.4cm,在满足部分领域应用要求的情况下提高效率和抗干扰能力。

As for the advantage that triple-frequency extra-wide-lane or wide-line ambiguities are easily fixed ,a single epoch algorithm of short baseline RTK based on triple-frequency wide-lane combination is proposed .First the extra-wide-lane ambiguities (0 ,-1 ,1) are resolved by carrier-pseudo combination method ,then the wide-lane ambiguities (1 ,-1 ,0) by CIR (Cascade Integer Resolution) with the fixed ambiguities .The influence of noise and ionosphere delay of the wide-lane ambiguities (0 ,-1 ,1 ) are smallest ,so this combination is chozen to resolve the coordinates based on single epoch data .Experimental results show that the single epoch algorithm proposed is feasible to calculate the coordinates ,with the statistical positioning error in plane 2 cm ,and the error in up direction about 5cm .