Ground-Based GPS Tomography of Water Vapor : Analysis of Simulated and Real Data (3.Application of GPS Data to Atmospheric Science)

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概要

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• We present the concept, some of the approaches used, and the capabilities of the technique referred to as GPS tomography. It is used for retrieval of the 3-dimensional distribution of the refractivity due to atmospheric water vapor. We discuss the presently used methods for retrieval of the primary observable in the GPS tomography, the slant path delay, as well as their shortcomings. Comparisons of GPS slant delays to independent data from a microwave radiometer are included. From a tomographic point of view we concentrate on the capabilities to retrieve the vertical structure of the wet refractivity. For this purpose we present and apply two methods for tomographic inversion. Both are based on the Kalman filtering technique, where the expected statistical behavior of the refractivity is utilized. The difference between the two is in the way the covariance matrix of the Kalman filter is constructed. We base our study on simulated and real data from the ground network of 8 GPS receivers operating in Goteborg, Sweden. The results demonstrate that at present the limitations of the GPS tomographic technique are errors in the retrieved wet slant delays and their poor geometric distribution.

• 社団法人日本気象学会の論文
• 2004-03-25

著者

• Gradinarsky L

  Onsala Space Observatory

• GRADINARSKY Lubomir

  Onsala Space Observatory

• JARLEMARK Per

  SP Swedish National Testing and Research Institute

関連論文

• Ground-Based GPS Tomography of Water Vapor : Analysis of Simulated and Real Data (3.Application of GPS Data to Atmospheric Science)
• Wet path delay and delay gradients inferred from microwave radiometer, GPS and VLBI observations

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