Tag: Rain

UK Rain Rate Map for Microwave

The contours of the map are for rain-rate (mm/h) exceeded for 0.01% of time.
The map is positioned in relation to the UK according to the following co-ordinates:

UK rainfall rates for planning microwave links

The map of UK rain rates is constructed from British Atmospheric Data Centre and ITU data. A full explanation is given in (legacy) paper RSSP(05-01)/42, available from Ofcom on request.

UK Microwave Link Planning

Planning of Microwave Links requires understanding of Microwave Propagation. For frequencies above 10GHz, rain fade is significant and needs to be taken into account. Modern Microwave Planning tools can incorporate this data and calculations to achieve Availability Calculations for microwave links deployed in all regions worldwide.

Data is from regulator OFCOM document:
“OfW 446: Technical Frequency Assignment Criteria for Fixed Point-to-Point Radio Services with Digital Modulation “

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Rec. ITU-R PN.837-1

Rec. ITU-R PN.837-1

CHARACTERISTICS OF PRECIPITATION FOR PROPAGATION MODELLING: RECOMMENDATION ITU-R PN.837-1

This document contains information on the statistics of precipitation intensity is needed for the prediction of attenuation and scattering caused by precipitation;

This data with Rain Zones is used for planning of Microwave Links and Radio Links worldwide, especially for Rain Fade and Link Availability Calculations

When the rain climate zone is required in computer applications for any given set of geographic coordinates, the program RAINZONE be used. (The software for RAINZONE may be obtained from the ITU Radiocommunication Bureau.)

Rec. ITU-R PN.837-1 1
RECOMMENDATION ITU-R PN.837-1
CHARACTERISTICS OF PRECIPITATION FOR PROPAGATION MODELLING

Table 1 is used to obtain the expected median cumulative distribution of rain rate for the rain climate
region;

TABLE 1
Rain climatic zones

Rainfall intensity exceeded (mm/h) (Reference to Figs. 1 to 3)

CableFree-ITU-837-1-T1
ITU-837-1 Table 1

 

CableFree-ITU-837-1-Fig1
ITU-837-1-Fig1

CableFree-ITU-837-1-Fig2
ITU-837-1-Fig2

CableFree-ITU-837-1-Fig3
ITU-837-1-Fig3

The above charts show the rain zones around the world in for each country and region.  This data is available in more up-to-date formats and used in many radio planning tools.

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