We conduct accurate and reliable lightning observations in real-time, 24 hours a day.
JLDN (Japanese Lightning Detection Network) is a nationwide lightning observation network operated by Franklin Japan. It consists of 31 sensors from Hokkaido to Okinawa, creating an observation network that seamlessly covers all of Japan. The lightning location accuracy of JLDN is below an average positional error of 300 meters, achieving precision comparable to large-scale lightning observation networks such as NALDN (North America) and EUCLID (Europe). 【Examples of Data Utilization】 ■ Social Infrastructure ■ Life Protection ■ Industry ■ Accident Investigation ■ Research Institutions ■ Media *For more details, please refer to the PDF materials or feel free to contact us.
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**Overview of Lightning Observation** ■ MDF Method (Magnetic Field Direction Measurement) - The reference point is determined at the location where the data errors of each sensor are minimized within the intersection of the orientation data lines of each sensor. ■ TOA Method (Time of Arrival Difference) - The errors of the signals received by each sensor are measured, and the time differences are converted into distance differences, resulting in hyperbolas that represent trajectories where the distance differences are constant. - Similarly, hyperbolas are drawn from another sensor, and the suitable point is determined from their intersection. *For more details, please refer to the PDF document or feel free to contact us.*
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For more details, please refer to the PDF document or feel free to contact us.
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Franklin Japan has been operating the Japan Lightning Detection Network (JLDN), the first and only nationwide lightning observation network in Japan, since October 1998. JLDN networks sensors installed across the country and utilizes accurate time information sent from GPS to observe the location, time, and current value of lightning strikes. The observation accuracy of JLDN boasts a capture rate of over 90% within its coverage area, with a location error of less than 500 meters, making it arguably the best lightning observation network in the world currently available. The observed lightning strike data is used in real-time for power management in factories, maintenance of networks, and protection of human life in outdoor sports.