Recommendation ITU-R P.839¶
This Recommendation provides a method to predict the rain height for propagation prediction.
| Title | Latest approved in | |
|---|---|---|
| Recommendation ITU-R P.839 | [PDF] | 2013-09 |
| Rain height model for prediction methods | ||
| Current recommendation version (In force) | Date | |
| Recommendation ITU-R P.839-4 | [PDF] | 09/2013 |
| Recommendations implemented in ITU-Rpy | Date | |
| Recommendation ITU-R P.839-4 | [PDF] | 09/2013 |
| Recommendation ITU-R P.839-3 | [PDF] | 02/2001 |
| Recommendation ITU-R P.839-2 | [PDF] | 10/1999 |
| Recommendations not implemented in ITU-Rpy | Date | |
| Recommendation ITU-R P.839-1 | [PDF] | 08/1997 |
| Recommendation ITU-R P.839-0 | [PDF] | 03/1992 |
Introduction¶
The mean annual rain height above mean sea level, hR, may be obtained from the 0° C isotherm as:
for areas of the world where no specific information is available, the mean annual 0° C isotherm height above mean sea level, h0, is an integral part of this Recommendation. The data is provided from 0° to 360° in longitude and from +90° to –90° in latitude. For a location different from the grid-points, the mean annual 0° C isotherm height above mean sea level at the desired location can be derived by performing a bilinear interpolation on the values at the four closest gridpoints.
Module description¶
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itur.models.itu839.change_version(new_version)[source]¶ Change the version of the ITU-R P.839 recommendation currently being used.
This function changes the model used for the ITU-R P.839 recommendation to a different version.
Parameters: new_version (int) – Number of the version to use. Valid values are:
- 4: Activates recommendation ITU-R P.839-4 (09/2013) (Current version)
- 3: Activates recommendation ITU-R P.839-3 (02/01) (Superseded)
- 2: Activates recommendation ITU-R P.839-2 (10/99) (Superseded)
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itur.models.itu839.get_version()[source]¶ Obtain the version of the ITU-R P.839 recommendation currently being used.
Returns: version – Version currently being used. Return type: int
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itur.models.itu839.isoterm_0(lat, lon)[source]¶ Estimate the zero degree Celsius isoterm height for propagation prediction.
Parameters: - lat (number, sequence, or numpy.ndarray) – Latitudes of the receiver points
- lon (number, sequence, or numpy.ndarray) – Longitudes of the receiver points
Returns: h0 – Zero degree Celsius isoterm height (km)
Return type: numpy.ndarray
References
[1] Rain height model for prediction methods: https://www.itu.int/rec/R-REC-P.839/en
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itur.models.itu839.rain_height(lat, lon)[source]¶ Estimate the annual mean rain height for propagation prediction.
The mean annual rain height above mean sea level, \(h_R\), may be obtained from the 0° C isotherm as:
\[h_R = h_0 + 0.36 \qquad \text{km}\]Parameters: - lat (number, sequence, or numpy.ndarray) – Latitudes of the receiver points
- lon (number, sequence, or numpy.ndarray) – Longitudes of the receiver points
Returns: hR – Annual mean rain height (km)
Return type: numpy.ndarray
References
[1] Rain height model for prediction methods: https://www.itu.int/rec/R-REC-P.839/en