Study on signal authentication on ships using spatial reception characteristics of GNSS

2023 Fiscal Year Final Research Report

• Project/Area Number: 19H02355
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 24020:Marine engineering-related
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: KUBO NOBUAKI 東京海洋大学, 学術研究院, 教授 (80343169)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: GNSS / 欺瞞信号 / 干渉 / マルチパス / 右旋円偏波 / 左旋円偏波 / GNSSコンパス

Outline of Final Research Achievements

The effect of the proposed method for detecting spoofing signals by taking advantage of the spatial reception characteristics of satellite positioning, specifically the characteristics of right and left circular polarization, was confirmed in experiments including during actual vessel navigation. Although the outdoor experiments were limited because they were limited to the range of weak radio waves, false signals could be detected with a probability of more than 95%. The method using the GNSS compass was also confirmed to be effective. In the future, it is expected that outdoor experiments will be conducted using methods that are not limited to weak radio waves, as well as the use of advanced simulators.

Free Research Field

衛星測位

Academic Significance and Societal Importance of the Research Achievements

研究成果の学術的意義は、衛星測位の偽信号の検知に、一般的な人工衛星の送信信号である右旋円偏波と左旋円偏波の特性を利用することができた点である。衛星測位は全て右旋円偏波を利用しているため、実環境では必ず右旋円偏波と反射による発生する左旋円偏波の受信がそれぞれの衛星電波の到達タイミングで発生する。一方、偽信号は1つのアンテナから送信されることがほとんどであり、右旋、左旋ともに画一的な受信信号となり判別が容易であった。また、この偽信号の対策は、衛星測位分野では今後の高信頼・高安全のアプリケーションにとって必須であり、社会的意義もある課題であったと考える。