Abstract:The observation experiments of balloon borne radiosonde rising and parachute carrying radiosonde descending were carried out, and the methods for evaluating the temperature, relative humidity and pressure of dropsonde were established. The results showed that the accuracy of temperature and pressure of Beidou dropsonde ascending is quite similar to that of RS92, and the relative humidity is worse than the double heating humidity sensor of RS92. The accuracy of temperature of Beidou dropsonde descending is almost equivalent to that of RS92 and the pressure has some influences on the positioning due to the fast falling, resulting in greater pressure error. The error of relative humidity is basically within 5%, meeting the requirements of WMO measurements. Beidou and RS92 are matched with wind profile radar in time and space. On the rising phase, the accuracy of wind direction of Beidou is worse than that of RS92, and the accuracy of wind speed is significantly greater than that of RS92. In addition, the results showed that the 2-time observation mode of the ball-loaded descent sounding has good application prospect and could realize the densifying observation in space and time of upper-air station network.