{'fraction_non_alphanumeric': 0.02059202059202059, 'fraction_numerical': 0.003861003861003861, 'mean_word_length': 4.678832116788321, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Research on Radio Wave Coverage inside Train in Confined Space

In this paper, radio wave coverage properties inside a train located in confined space are studied by using Time-Domain Finite Difference method (FDTD). The works in this paper are mainly focused on the effect of materials of train and windows on the radio wave coverage. Calculation results show that metallic train body will cause a loss about 10 dB. When using Fiber Reinforced Plastic (FRP) as train body, the loss reduces significantly. In addition, for windows, using heat-absorbing glazing leads to an extra loss about 1 dB compared to that of dielectric glass. It is concluded that train material and windows have certain impacts on the radio wave coverage inside the train and need to be further studied.