地基GPS技术遥感香港地区大气水汽含量

Abstract

提出了分段多项式方法计算大气水汽含量，并结合无线电高空气象探测资料，分析并评估了地基ＧＰＳ遥感技术的精度。香港地区的可降水份计算结果表明，地基ＧＰＳ遥感技术的精度为１ ｍ ｍ ～２ ｍ ｍ Ground based GPS technique is rapidly growing in remote sensing water vapor content in the atmosphere. In this paper, the problem of extracting water vapor content information from GPS data is examined. A new approach, namely as piecewise linear method has been proposed in the estimation of precipitable water vapor through Hong Kong DGPS station observations. Considering no meteorological measurements, a simple interpolated method weighted by distance is developed to perform the interpolation using the meteorological observations around Hong Kong DGPS station. To evaluate the attainable accuracy of water vapor content sensed by GPS, radiosonde data, which are collected locally by Hong Kong Observatory, are used to calculate the precipitable water vapor. One month results of precipitable water vapor from both ground based GPS technique and radiosonde method exhibit very good agreement within 1 mm~2 mm.