By extracting the necessary information in the gps signal and merging with the satellite orbital data , the position of the radiosonde and hence the wind vector is calculated 地面站接收到gps信号后会抽出所需资料，再加入有关卫星轨道的数据，便可计算出无线电探空仪的位置，从而计算出高空风向和风速。
Over the years new innovative technologies such as wireless telegraphy , radiosonde , radar , satellite and computer , were applied by the observatory for improving its weather forecasting and warning services 历年来天文台应用创新的科技不断改进天气预报及警报服务。这些科技包括无线电报、无线电探空仪、雷达、气象卫星及电脑等。
The radiosonde helps determine the wind direction , wind speed , temperature , humidity and pressure at various heights aloft , sometimes up to 30 000 metres 100 000 feet , and radios the weather information back to ground 上升过程中，无线电探空仪不断测量大气层不同高度的风向、风速、温度、湿度及气压，并将数据传送至地面。
Mr . fung had been actively contributing to the development of the upper - air sounding system in the hko - from manual operation to automatic sounding as well as the upgrade to use a new series of radiosonde 冯先生一直以来积极参与部门发展高空空气探测系统工作，开始时人手操作，发展到自动探测，及至发展到现时采用无线电探空仪。
Over the years new innovative technologies such as wireless telegraphy , radiosonde , radar , satellite and computer , were applied by the observatory for improving its weather forecasting and warning services 历年来天文台应用创新的科技不断改进天气预报及警报服务。这些科技包括无线电报、无线电探空仪、雷达、气象卫星及电脑等。
The radiosonde helps determine the wind direction , wind speed , temperature , humidity and pressure at various heights aloft , sometimes up to 30 000 metres ( 100 000 feet ) , and radios the weather information back to ground 上升过程中，无线电探空仪不断测量大气层不同高度的风向、风速、温度、湿度及气压，并将数据传送至地面。
The observatory conducts upper - air measurements three times daily at 8am , 2pm and 8pm at king s park meteorological station . each measurement involves the launch of a meteorological balloon about one - metre wide carrying a radiosonde 每次施放一个约一米直径的气象气球，携带无线电探空仪升上高空，最高可达三十公里(十万英尺)的高度。
Both the radiosonde and the ground station are equipped with special antennae for receiving satellite - based gps signals . these signals , combined with the relevant satellite orbital data , enable the wind to be computed 在探测过程中，无线电探空仪和地面站均装有特别天线，接收gps信号，再加入有关卫星轨道的数据，便可计算出高空风向和风速。
The observatory conducts upper - air measurements three times daily at 8am , 2pm and 8pm at king s park meteorological station . each measurement involves the launch of a meteorological balloon about one - metre wide carrying a radiosonde 每次施放一个约一米直径的气象气球，携带无线电探空仪升上高空，最高可达三十公里(十万英尺)的高度。
This system employed a new concept for measuring upper winds , viz . use of vlf very low frequency in the range of 10 - 13 khz signals from a global navigational network , omega , for computing the wind 与以往无线电相比，该系统在测风方面则采用了一种新的概念，利用世界性奥米茄导航站网的甚低频信号10 - 13khz来计算出高空风向和风速，无需用雷达追踪探空仪位置。
