GPS Radiosonde observe meteorological data such as wind speed, wind direction, atmos　pheric pressure, temperature, and humidity at approximately 35 km above the ground. Wind speed, wind direction, and air pressure are cal　culated based on the speed of movement and altitude obtained by GPS positioning technolo　gy. Every second observation data is convert to digital signals .After that transmit to the ground receiving system.

iMS-100(eco)achieved innovative miniaturize　tion and weight reduction through the aggres　sive use of the latest electronic components. By doing this, it is possible to reduce the size of balloons and other equipment used during flight and to reduce the amount of gas used. Not only reduces operating costs, plus reduces waste and is environmentally friendly. Further　more, frame is made from LACTIF®, That is biodegradable material made from corn, which contributes to the reduction of microplastics.
In terms of performance, iMS-100 certified GRUAN Data Product certification. That is adopt highly accurate and transparent algo　rithms, Used for GRUAN observation station