scholarly journals Monitoring the atmospheric boundary layer by GPS radio occultation signals recorded in the open-loop mode

2006 ◽  
Vol 33 (12) ◽  
Author(s):  
S. Sokolovskiy ◽  
Y.-H. Kuo ◽  
C. Rocken ◽  
W. S. Schreiner ◽  
D. Hunt ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Radio Occultation ◽  
Open Loop ◽  
Gps Radio Occultation

scholarly journals GPS radio occultation with TerraSAR-X and TanDEM-X: sensitivity of lower troposphere sounding to the Open-Loop Doppler model

2014 ◽  
Vol 7 (12) ◽  
pp. 12719-12733 ◽  
Author(s):  
F. Zus ◽  
G. Beyerle ◽  
S. Heise ◽  
T. Schmidt ◽  
J. Wickert
Keyword(s):  
Radio Occultation ◽  
Weather Prediction ◽  
Lower Troposphere ◽  
Systematic Difference ◽  
Open Loop ◽  
Negative Bias ◽  
Upper Troposphere ◽  
Gps Radio Occultation ◽  
Global Positioning ◽  
Data Source

Abstract. The Global Positioning System (GPS) radio occultation (RO) technique provides valuable input for numerical weather prediction and is considered as a data source for climate related research. Numerous studies outline the high precision and accuracy of RO atmospheric soundings in the upper troposphere and lower stratosphere. In this altitude region (8–25 km) RO atmospheric soundings are considered to be free of any systematic error. In the tropical (30° S–30° N) Lower (<8 km) Troposphere (LT), this is not the case; systematic differences with respect to independent data sources exist and are still not completely understood. To date only little attention has been paid to the Open Loop (OL) Doppler model. Here we report on a RO experiment carried out on-board of the twin satellite configuration TerraSAR-X and TanDEM-X which possibly explains to some extent biases in the tropical LT. In two sessions we altered the OL Doppler model aboard TanDEM-X by not more than ±5 Hz with respect to TerraSAR-X and compare collocated atmospheric refractivity profiles. We find a systematic difference in the retrieved refractivity. The bias mainly stems from the tropical LT; there the bias reaches up to ±1%. Hence, we conclude that the negative bias (several Hz) of the OL Doppler model aboard TerraSAR-X introduces a negative bias (in addition to the negative bias which is primarily caused by critical refraction) in our retrieved refractivity in the tropical LT.

A few important features of global atmospheric boundary layer heights estimated using COSMIC radio occultation retrieved data

2019 ◽  
Vol 94 (5) ◽  
pp. 555-563
Author(s):  
P. S. Brahmanandam ◽  
V. Naveen Kumar ◽  
G. Anil Kumar ◽  
M. Purnachandra Rao ◽  
K. Samatha ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Radio Occultation ◽  
Cosmic Radio

scholarly journals Planetary boundary layer heights from GPS radio occultation refractivity and humidity profiles

2012 ◽  
Vol 117 (D16) ◽  
pp. n/a-n/a ◽  
Author(s):  
Chi O. Ao ◽  
Duane E. Waliser ◽  
Steven K. Chan ◽  
Jui-Lin Li ◽  
Baijun Tian ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Planetary Boundary Layer ◽  
Radio Occultation ◽  
Gps Radio Occultation ◽  
Humidity Profiles

scholarly journals Open-Loop Tracking of Rising and Setting GPS Radio-Occultation Signals From an Airborne Platform: Signal Model and Error Analysis

2016 ◽  
Vol 54 (7) ◽  
pp. 3967-3984 ◽  
Author(s):  
Kuo-Nung Wang ◽  
James L. Garrison ◽  
Ulvi Acikoz ◽  
Jennifer S. Haase ◽  
Brian J. Murphy ◽  
...  
Keyword(s):  
Error Analysis ◽  
Radio Occultation ◽  
Open Loop ◽  
Signal Model ◽  
Gps Radio Occultation
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