SS SONDE 01 Radisonde (GPS Aerological Meteorological Sounding System) can accomplish the measurement of the five meteorological elements viz. temperature, air pressure, humidity, wind direction and wind speed with accuracy comparable with the best in the industry. High speed data processing terminal automatically records and process the meteorological data and print reports needed to predict the weather accurately for research of boundary layer and weather prediction. It possible to choose a free frequency slot in the frequency band, also in noisy conditions, it shall be possible to tune the radiosonde transmitter to any frequency within the frequency band. Frequency range is limited so that inadvertent tuning to unauthorized frequency is prevented. In addition to manual tuning, the system is capable of tuning the radiosonde automatically to a predefined value within the range. The design and construction of the radiosonde is such that no physical, electrical or chemical hazards are presented to operators, other personnel, or to any unskilled labour who requires access to the radiosonde preparation room. The design is also free from projections that may cause hazard to humans or animals during preparation or on landing. The radiosonde and de-reeler design enables a balloon launch in wind speeds up to 35m/s. The suspension string between the radiosonde and balloon is 30 meters or more to eliminate possible temperature errors caused by the balloon. The suspension string uncoils slowly enough to prevent the sonde from hitting the ground when released. Humidity sensor is designed in such a way that the risk of ice formation on the humidity sensor is minimized. Both humidity and temperature sensors are mounted externally so that air that has previously been in contact with the radiosonde body does not affect the measurement. Both, humidity and temperature sensors are mounted so that thermal conduction from the radiosonde body does not affect the measurement. It is ensured that the sensor inflight position in relation to sonde body is the same in every radiosonde i.e., the position will not be altered by the user. Both, humidity and temperature sensors have fast recovery from high humidity conditions or a cloud so that cloud top is reliably detected. Radiosonde are calibrated before delivery. Calibration data is stored in the radiosonde and is read automatically by the ground equipment during radiosonde preparation.