High-precision equipment for reproducing, storing, and transmitting sinusoidal scale-conversion factor units

1977 ◽  
Vol 20 (12) ◽  
pp. 1728-1731
Author(s):  
B. V. Zakharov
Keyword(s):  
High Precision ◽  
Conversion Factor ◽  
Precision Equipment

scholarly journals WATER VAPOR CONVERSION FACTOR OVER QINGHAI-TIBET PLATEAU REGION CONSIDERING ELEVATION, LATITUDE AND FINE SEASONAL VARIATION IS CONSTRUCTED

2020 ◽  
Vol XLII-3/W10 ◽  
pp. 271-277
Author(s):  
H. Peng ◽  
L. K. Huang ◽  
C. Li ◽  
L. L. Liu ◽  
S. Wang ◽  
...  
Keyword(s):  
Water Vapor ◽  
High Precision ◽  
Conversion Factor ◽  
Conversion Coefficient ◽  
Reference Value ◽  
Radiosonde Data ◽  
Tibet Plateau ◽  
Grid Data ◽  
Plateau Region ◽  
Qinghai Tibet Plateau

Abstract. In this paper, the conversion factor K model of Qinghai-Tibet plateau region was established based on the QTm model which is established using high-precision the Global Geodetic Observing System (GGOS) Atmosphere grid data from 2007 to 2014. The model took into account the influence of elevation fluctuation and latitude change on the model, and analyzed the relevant characteristics with seasonal changes. The 2015 GGOS grid data and radiosonde data were used as the reference value for accuracy assess. The established QTm model was compared with GPT2w model in bias and RMS. Compared with GGOS grid data, the average annual bias and RMS of QTm model were -0.28K and 2.70k respectively. The RMS of GPT2w-5 and GPT2w-1 were 58.16% and 28.84% higher, respectively. Compared with radiosonde data, QTm model has 1.13k average annual bias and the RMS error of 2.92k. Compared with GPT2w-5 and GPT2w-1, the RMS value of QTm model was improved by 25.08% and 29.43%, respectively. The value of atmospheric water vapor conversion coefficient was calculated by the integral method calculated by radio sounding data in the Qinghai-Tibet region in 2015 was used as the reference value for assess the performance of conversion factor K, and compared and analyzed the conversion coefficient K which provided by QTm and GPT2w. The results show that the value of Tm provided by QTm model has the highest accuracy, which is 25.07% higher than that of GPT2w-5 and 29.42% higher than that of GPT2w-1. QTm models can achieve GPS-PWV retrieval precision of better than 2 mm. Which has potential application for high-precision real-time GNSS-PWV retrieving in Qinghai-Tibet region.

High-precision equipment for reproducing unit permittivity of solid dielectrics at 9.5 GHz

1974 ◽  
Vol 17 (7) ◽  
pp. 1001-1003
Author(s):  
E. B. Zal'tsman ◽  
O. F. Kiselev ◽  
V. E. Poyarkova
Keyword(s):  
High Precision ◽  
Precision Equipment ◽  
Solid Dielectrics
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