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多径效应是高精度卫星导航定位的主要误差源之一,需采取措施进行抑制。现有多径参数估计是重要的多径抑制方法,但计算量太大、实现较复杂,其主要原因是无法预先知道多径延迟范围而采用全局逐个盲目搜索,因而可用性不强,如能预先将多径延迟范围锁定在一定范围,将大大减少计算量和算法复杂度。文章首次提出一种基于相关曲线斜率进行多径范围检测的策略,利用多径影响下相关峰右侧的相关曲线斜率畸变来完成对多径的检测。该方法可简单、快速检测出多径有无,并确定多径范围,从而为后续数据处理缩小搜索范围,减小计算量。结果表明,在一定虚警概率下,该算法具有较高的检测概率,可有效检测出多径所在的范围。
Multi-path effect is one of the main error sources of high-precision satellite navigation and positioning, and measures need to be taken to suppress it. The existing multipath parameter estimation is an important method of multipath suppression. However, the calculation complexity is too large and the implementation is complicated. The main reason is that it can not be used in advance because it can not search the multipath delay range in advance and blindly searches the whole network blindly. Therefore, Locking the multipath delay range in a certain range will greatly reduce the computational complexity and algorithm complexity. This paper proposes for the first time a multi-path detection method based on the slope of the correlation curve, and uses the slope distortion of the correlation curve to the right of the correlation peak under the influence of multipath to complete the detection of multipath. The method can detect the multipath presence and absence quickly and quickly and determine the multipath range, which can reduce the search range and reduce the computational cost for the subsequent data processing. The results show that under certain false alarm probability, this algorithm has high detection probability and can effectively detect the range of multipath.