3 Command Line Reference
stm
gtm
setTroposphereModel
getTroposphereModel
ZenithModel
MappingModel
off
Saastamoinen
MOPS
Niell
MOPS
RxControl: Navigation > Receiver Operation > Position > Atmosphere
Use these commands to define/inquire the type of model used to correct tropospheric errors
in the PVT computation.
The
ZenithModel
parameter indicates which model the receiver uses to compute the dry and
wet delays for radio signals at 90 degree elevation. The modelled zenith tropospheric delay
depends on assumptions for the local air total pressure, the water vapour pressure and the
mean temperature. The following zenith models are defined:
ZenithModel
Description
off
The measurements will not be corrected for the troposphere de-
lay. This may be desirable if the receiver is connected to a GNSS
signal simulator.
Saastamoinen
Saastamoinen, J. (1973). "Contributions to the theory of atmo-
spheric refraction". In three parts. Bulletin Geodesique, No 105,
pp. 279-298; No 106, pp. 383-397; No. 107, pp. 13-34.
MOPS
Minimum Operational Performance Standards for Global Posi-
tioning/Wide Area Augmentation System Airborne Equipment
RTCA/DO-229C, November 28, 2001.
The
Saastamoinen
model uses user-provided values of air temperature, total air pressure
referenced to the Mean Sea Level and relative humidity (see
command) and estimates actual values adjusted to the receiver height.
The MOPS model neglects the user-provided values and instead assumes a seasonal model
for all the climatic parameters. Local tropospheric conditions are estimated based on the
coordinates and time of the year.
The use of the
Saastamoinen
model can be recommended if external information on tem-
perature, pressure, humidity is available. Otherwise it is advisable to rely on climate models.
The zenith delay is mapped to the current elevation for each satellite using the requested
MappingModel
. The following mapping models are defined:
MappingModel
Description
Niell
Niell, A.E. (1996). Global Mapping Functions for the atmosphere
delay at radio wavelengths, Journal of Geophysical Research,
Vol. 101, No. B2, pp. 3227-3246.
MOPS
Minimum Operational Performance Standards for Global Posi-
tioning/Wide Area Augmentation System Airborne Equipment
RTCA/DO-229C, November 28, 2001.
Examples
149
Summary of Contents for PolaRx5TR
Page 1: ...PolaRx5TR Reference Guide Applicable to version 5 5 0 of the Firmware ...
Page 73: ...3 Command Line Reference Chapter 3 Command Line Reference 73 ...
Page 130: ...3 Command Line Reference COM1 gim CR R gim IonosphereModel off COM1 130 ...
Page 237: ...3 Command Line Reference COM1 237 ...
Page 279: ...3 Command Line Reference COM1 279 ...
Page 294: ...4 SBF Reference Chapter 4 SBF Reference 294 ...