船上における地上デジタルテレビ放送の受信手法に関する研究

Abstract

At the time of large-scale disasters, we are restricted of using mobile phones and the Internet. On the other hand, many broadcast stations were quick to begin broadcasting from affected areas. We have previously reported that they evaluated receivable areas of the terrestrial digital broadcast onboard. However, it was focused on reception levels, it remains to be elucidated methodological improvements for ISDB-T reception onboard. This paper describes investigations of measuring reception levels and evaluated some systems for ISDB-T onboard. This study revealed, even a marine antenna was not high gain, improvements of MER and BER were confirmed when using a 700MHz band filter, diversity reception methods were effective. Moreover, one segment increased viewing areas onboard by approximately 20%. The author concluded, 700MHz band waves were affected even at sea hence countermeasures using 700MHz mobile phone band filters were necessary, selective diversity was effective because it was possible to switch to antennas on the land side, the one segment broadcasting system was effective onboard because it was enables viewing in areas where they were not been possible before during coastal voyages.