Analysis and Evaluation of the Reconfigured Exponential Troposphere Model (ETM)

摘要

This report presents a comprehensive analysis and evaluation of the current troposphere database and processing algorithm for eight regional areas (United States, Europe, Middle East, Southeast Asia, Northeast Asia, Amazon Rain Forest, Sahara Desert, and Australia). Software quality evaluation on all troposphere-related programs has been performed by adopting a Cyclomatic Complexity Metrics tool by NIST standard 500-235 issued in September 1995. This report contains a reprogrammed and refined weather database with FNL, ECMWF, MRF, and HIRAS datasets, surface data utility, and automated data processing to increase the processing efficiency and speed. It also establishes new storage and backup procedures for the periods of 1981 to 1990, 1991 to 2000, and January 2001 to present. This report also describes the redesigned troposphere time-delay and angle error computation program, which defines several new parameters and a data representation methodology for easier access to the database and a more user-friendly interface.