GRACE-FO radio occultation data processing – First result

An objective of the GRACE-FO mission is the continuation of GRACE radio occultation measurements successfully performed between 2006 and 2017. GRACE and GRACE-FO radio occultations contribute to the overall radio occultation dataset used in weather and climate applications. Since mid-2019 rising occultations from GF1 are available while setting radio occultations from GF2 are still disabled. After several on-board software updates and raw data reader improvements about 280 daily GF1 radio occultations are available since March 2020. Currently GF1 radio occultation data are processed on the basis of different measured variables: For different GPS satellites a combination of L1CA/L2P, L1CA/L2C, or L1CA/L5 is available. In this study first results of GF1 processing are presented. Refractivity and temperature data up to an altitude of 60 km will be compared with ECMWF operational analyses and the quality of the different measured variables will be evaluated.

Radio Occultation Data Processing at the COSMIC Data Analysis and Archival Center (CDAAC)

First CHAMP Mission Results for Gravity, Magnetic and Atmospheric Studies ◽

10.1007/978-3-540-38366-6_73 ◽

2003 ◽

pp. 536-544 ◽

Author(s):

Bill Schreiner ◽

Doug Hunt ◽

Chris Rocken ◽

Sergey Sokolovskiy

Keyword(s):

Data Analysis ◽

Data Processing ◽

Radio Occultation ◽

Occultation Data ◽

RETRIEVAL OF ELECTRON DENSITY PROFILE FOR KOMPSAT-5 GPS RADIO OCCULTATION DATA PROCESSING SYSTEM

Journal of Astronomy and Space Sciences ◽

10.5140/jass.2007.24.4.297 ◽

2007 ◽

Vol 24 (4) ◽

pp. 297-308 ◽

Author(s):

Woo-Kyoung Lee ◽

Jong-Kyun Chun ◽

Sung-Ki Cho ◽

Jong-Uk Park ◽

Jung-Ho Cho ◽

...

Keyword(s):

Data Processing ◽

Electron Density ◽

Density Profile ◽

Radio Occultation ◽

Processing System ◽

Electron Density Profile ◽

Data Processing System ◽

Gps Radio Occultation ◽

Occultation Data ◽

Phase Transform Algorithm for Radio Occultation Data Processing

New Horizons in Occultation Research ◽

10.1007/978-3-642-00321-9_3 ◽

2009 ◽

pp. 27-37

Author(s):

J.J.W. Wilson ◽

J.-P. Luntama

Keyword(s):

Data Processing ◽

Radio Occultation ◽

Phase Transform ◽

Occultation Data ◽

The ROCSAT-3/COSMIC mission and applications of GPS radio occultation data to weather and climate

10.1117/12.566544 ◽

2004 ◽

Author(s):

Christian Rocken ◽

Ying-Hwa Kuo ◽

Sergey V. Sokolovskiy ◽

Richard A. Anthes

Keyword(s):

Radio Occultation ◽

Gps Radio Occultation ◽

Weather And Climate ◽

Occultation Data ◽

Applications of GPS Radio Occultation Data to Weather and Climate and the COSMIC Mission

Space 2004 Conference and Exhibit ◽

10.2514/6.2004-6067 ◽

2004 ◽

Author(s):

Ying-Hwa Kuo ◽

Christian Rocken ◽

Richard Anthes

Keyword(s):

Radio Occultation ◽

Gps Radio Occultation ◽

Weather And Climate ◽

Occultation Data ◽

A perspective on the fundamental quality of GPS radio occultation data

Atmospheric Measurement Techniques Discussions ◽

10.5194/amtd-7-9481-2014 ◽

2014 ◽

Vol 7 (9) ◽

pp. 9481-9508 ◽

Author(s):

T.-K. Wee ◽

Y.-H. Kuo

Keyword(s):

Radio Occultation ◽

Regional Scale ◽

Phase Measurements ◽

Weather Forecasts ◽

Weather And Climate ◽

Occultation Data ◽

Observation Space ◽

Promising Source ◽

Made In

Abstract. Radio Occultation (RO) is a promising source of observation for weather and climate applications. However, the uncertainties in processing and retrieving RO data may weaken the overall confidence in the data and discourage their use. This study assesses the fundamental quality of RO data, by modeling the "raw" measurement, phase path, through a ray tracing method without the nuisance of retrieval errors. The comparison of phase measurements with the European Center for Medium-Range Weather Forecasts (ECMWF) data made in the observation space shows that the RO measurement is of sufficient accuracy to uncover regional-scale systematic errors in ECMWF's operational analysis and the 45 year reanalysis (ERA40), and to clearly depict the error growth of short-term ERA40 forecasts. In the southern hemispheric stratosphere, in particular, the RO measurement served as a robust reference against which both of the two analyses were significantly biased in opposite directions even though they were produced by the same center using virtually the same set of data. The measurement and ECMWF analyses showed a close agreement in the standard deviation. This confirms the high accuracy of the RO measurement and also indicates that the main problem of the ECMWF analyses lies in their systematic error.