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- 2018
一种改进的宽巷引导整周模糊度固定算法
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Abstract:
一般卫星导航接收机的伪距测量误差大于宽巷波长。根据宽巷引导模型，直接使用双差伪距取整固定双差宽巷整周模糊度有很大概率会产生一周固定错误。基于此，提出了一种改进的宽巷引导整周模糊度固定算法，针对宽巷整周模糊度一周固定错误进行探测和修复。利用整周模糊度为整数的特质构造理论探测量，并将该探测量与载噪比所确定的门限相比较，判断是否出现宽巷整周模糊度一周固定错误；利用双差整周模糊度自由度为3的特点，修复错误宽巷整周模糊度。对该算法在高斯噪声条件下的可行性进行了理论分析，结果表明正常载噪比的观测数据均可分辨出一周宽巷整周模糊度的估计错误。同时，分析了考虑多径等误差后该算法所能接受的载波相位最大误差。计算了不同伪距误差下宽巷整周模糊度一周固定错误出现的概率。使用GPS实测短基线数据对算法进行验证，该算法可将基于宽巷引导的整周模糊度固定算法的固定率从原来的只有不到1/3提升至接近100%
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