The Japan Space Policy Committee announced the upgrade of the "Guide" satellite navigation system, with the target increased to 11 satellites

According to news on May 29, the Japanese government plans to upgrade its satellite navigation system to achieve more accurate navigation services. Japan's current approach satellite navigation system relies on the American GPS system, which has 4 satellites. However, this system has the problem of difficulty receiving signals in blocked areas. In order to solve this problem and promote the development of industrial applications such as autonomous driving, the Japanese government plans to increase the number of satellites in the "Guide" system to 11 to cover obscured areas including high-rise buildings and mountainous areas.

It is expected to be officially adopted at the cabinet meeting in the summer of 2023. The upgrade plan was proposed by the Japan Space Policy Committee. Rewritten sentence: The goal of this plan is to achieve all-weather, high-precision positioning data without relying on U.S. GPS. According to Professor Suzuki Kazuto's explanation, the addition of satellites will be carried out in stages, and the four satellites at the current stage can only be used as support for the US GPS system. The system only requires 7 satellites to perform positioning independently without relying on GPS. Even if the number of satellites is increased to 11, it is still possible to face difficulties in signal reception and reduced accuracy due to obstruction by buildings.

Since its first launch in 2010, Japan's "Guide" satellite navigation system has successively added multiple satellites. As of 2018, the system has developed a network of four satellites and can be integrated with the U.S. GPS system for all-weather operation. However, compared with China's "Beidou" navigation system, the "Guide" system currently only provides regional navigation services within Japan and has not yet achieved global coverage.

Global navigation services have been formed because China's "Beidou" navigation system has successfully launched 56 satellites. Although Japan's satellite navigation system is relatively lagging behind, increasing the number of satellites to 11 is enough to cover the domestic area. However, it is currently unclear the specific timetable for the Japanese government to achieve this goal. Upgrading the satellite navigation system is an initiative by the Japanese government to promote the development of emerging fields such as autonomous driving, aiming to improve the accuracy and reliability of domestic navigation services.

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