Orolia GSG-5 Series, User Manual With Scpi Manual, Page: 89 / 392

Tropo model
A number of tropospheric models are supported by the device. These are:
Saastamoinen model. The model is based on Saastamoinen, J., 'Atmospheric Cor-
rection for the Troposphere and Stratosphere in Radio Ranging of Satellites,' The
Use of Artificial Satellites for Geodesy, Geophysics Monograph Series, Vol. 15., Amer-
ican Geophysical Union, 1972
Black model. The model is based on Black H., ‘An Easily Implemented Algorithm for
the Tropospheric Range Correction’, JOURNAL OF GEOPHYSICAL RESEARCH,
1978
Goad&Goodman , a tropospheric model based on Goad and Goodman(1974), "A
Modified Hopfield Tropospheric Refraction Correction Model", 1974
STANAG model. The model is based on NATO Standardization Agreement
(STANAG) Doc. 4294, Appendix 6.
The tropospheric model can also be set to Off , and no tropospheric delays are used in sim-
ulation. Under normal testing conditions, one of the tropospheric model
should
be used.
The tropospheric model also allows for the temperature, pressure and humidity to be con-
figured:
Temperature : to be specified in degrees Celsius
Atmospheric pressure : in millibars
Humidity : relative humidity in percent.
The graph below illustrates the delays for the different models available, using default val-
ues for environmental conditions.
Note that the tropospheric delay added to satellites with low elevation angles are ‘capped’
at a maximum value. The capping delay value and the elevation angle are a function of the
model used.
3.5 "Select" Menu
User Manual GSG-5/6 Series Rev. 27 73