中文说明：多径干扰是对 GPS 定位和定时应用有害。然而，GPS 多路径效应对反射的好处已经成为日益清晰监测土壤湿度、 积雪深度和植被生长。在定位应用程序中，一种模拟器可以支持抗多径干扰努力在例如，选址、 天线设计、 接收机性能评估、 以及有关常见的参数化的不同意见。反射，以便将观察到的多径参数转换成可用的环保产品，它是重要的是要能够显式链接到，GPS 接收天线和反射的环境特性已知的 GPS 观测量。现有的 GPS 多路径软件模拟器并非一般随时可供一般的科学界使用和/或修改。在这里，一种模拟器已在 Matlab/倍频程，都可作为开放源码的代码。它可以产生信号信噪比、 载波相位和码伪距观测，L1 和 L2 载波频率和 c/A、 原先和 L2C 调制的基础。它对不同的表面和天线类型夫妇的适当考虑极化和连贯性。除了提供预定义的物料类型 （水、 混凝土、 土壤等），它允许某些三维属性各不相同，如土壤水分和雪密度。
English Description：
Multipath is detrimental for both GPS positioning and timing applications. However, the benefits of GPS multipath for reflectometry have become increasingly clear for monitoring soil moisture, snow depth, and vegetation growth. In positioning applications, a simulator can support multipath mitigation efforts in terms of, e.g., site selection, antenna design, receiver performance assessment, and in relating different observations to a common parameterization. For reflectometry, in order to convert observed multipath parameters into useable environmental products, it is important to be able to explicitly link the GPS observables to known characteristics of the GPS receiver/antenna and the reflecting environment. Existing GPS multipath software simulators are generally not readily available for the general scientific community to use and/or modify. Here, a simulator has been implemented in Matlab/Octave and is made available as open source code. It can produce signal-to-noise ratio, carri