低高度角双频非差数据的周跳探测方法研究

针对低高度角双频非差数据测量噪声大、周跳探测容易出现误判和漏判的情况,本文基于电离层残差组合和MW组合进行了周跳探测算法的改进。在电离层残差法的周跳探测中,引入了时间窗口方法,利用周跳检测量的误差分布合理确定判定阈值的大小;在宽巷周跳的探测中,对MW组合方法中的判定条件进行了改进,采用加权递推平滑和时间窗口相结合的方法进行宽巷模糊度的精确估计和精度评价。经IGS站观测数据验证,改进算法取得了较好的周跳探测效果。

Cycle-Slip Detection Methods for Dual-frequency Un-difference Data at Low Elevation Angle

GPS dual-frequency un-difference observations at low elevation angle are prone to large measurement noises, misjudgments, and false negatives in cycle-slip detection. This paper proposes a modified cycle-slip detection algorithm, based on ionosphere residual and MW observation combination. First, the ionosphere residual algorithm is improved by introducing a time window method to calculate a more realistic threshold using the cycle-slip detected error distribution. Then, during wide lane cycle-slip detection, the determinant conditions of the MW combination algorithm was improved by combining the weighted recursive smoothing method and time window method to estimate the wide lane ambiguity and evaluate its precision. Verified by IGS observation data, the improved algorithm achieves good cycle slip detection results.