Introduction
PisharotySonde system is an indigenous GPS Sonde (Radiosonde) system developed by VSSC/ISRO using commercially off the shelf components (COTS) for high quality atmospheric parameter measurement.
The Sonde system consists of the balloon borne segment referred as PisharotySonde and the ground segment referred as PisharotySonde Ground Station. PisharotySonde uses sensors for measuring the atmospheric temperature& relative humidity and GPS receiver module for acquiring the wind parameters, altitude, date and time. Pressure information can be derived from the height and temperature information using software. Sensor and GPS data are processed and transmitted to ground station. PisharotySonde Ground Station consists of the Antenna Assembly & LNB, Receiver and Data Processing & Display unit. Sonde system incorporates the software for solar radiation correction on temperature measurement.
The Sonde system also generates the WMO specified ‘temp’ messages for reporting the data. This indigenous low cost system is compact and light weight (125 grams). PisharotySonde system is validated by comparison ascents with various internationally available high quality Sonde systems and the performance is confirmed. The system performance is evaluated independently by IMD and cleared for meteorological applications. More than 12000Sondes were already realized by ISRO.
Specifications of PisharotySonde System
±0.5 hPa (≤100hPa)
Applications
The PisharotySonde System is used by scientists for boundary layer studies and upper atmospheric observations. PRWONAM (Prediction of Regional Weather using Observational meso Network and Atmospheric Modelling) project, coordinated by ISRO Headquarters, requires sonde ascents from a number of Ground stations. PisharotySonde system provides the low cost solution without compromising the quality for such applications. PisharotySonde system is also used by Space Physics Laboratory (SPL) VSSC, MET TERLS VSSC, MET/SHAR, SAC, NESAC and various universities for atmospheric studies. Data from the System is used regularly to support ISRO’s satellite launches. The System is identified as part of network of weather stations for thunderstorm observation in SAARC countries.
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