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ITU-R P.533

Method for the prediction of the performance of HF circuits

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Organization: ITU-R
Publication Date: 1 July 2015
Status: inactive
Page Count: 28
scope:

Introduction

This prediction procedure applies a ray-path analysis for path lengths up to 7 000 km, composite mode empirical formulations from the fit to measured data beyond 9 000 km and a smooth transition between these two approaches over the 7 000-9 000 km distance range.

Monthly median basic MUF, incident sky-wave field strength and available receiver power from a lossless receiving antenna of given gain are determined. The method includes an estimation of the parameters of the channel transfer function for use for the prediction of performance of digital systems. Methods are given for the assessment of circuit reliability. Signal strengths are standardized against an ITU-R measurement data bank. The method requires the determination of a number of ionospheric characteristics and propagation parameters at specified "control points".

In equatorial regions, in the evening hours (local time), it is possible to have distortions in the predicted results due to regional ionospheric structural instabilities which are not fully accounted for by this method.

Document History

ITU-R P.533
August 1, 2019
Method for the prediction of the performance of HF circuits
This Recommendation provides a method for the prediction of available frequencies, of signal levels and of the predicted reliability for both analogue and digital modulated systems at HF, taking into...
ITU-R P.533
July 1, 2015
Method for the prediction of the performance of HF circuits
Introduction This prediction procedure applies a ray-path analysis for path lengths up to 7 000 km, composite mode empirical formulations from the fit to measured data beyond 9 000 km and a smooth...
ITU-R P.533
September 1, 2013
Method for the prediction of the performance of HF circuits
This Recommendation provides a method for the prediction of available frequencies, of signal levels and of the predicted reliability for both analogue and digital modulated systems at HF, taking into...
ITU-R P.533
February 1, 2012
Method for the prediction of the performance of HF circuits
This Recommendation provides methods for the prediction of available frequencies, of signal levels and of the predicted reliability for both analogue and digital modulated systems at HF, taking...
ITU-R P.533
October 1, 2009
Method for the prediction of the performance of HF circuits
This Recommendation provides methods for the prediction of available frequencies, of signal levels and of the predicted reliability for both analogue and digital modulated systems at HF, taking...
ITU-R P.533
January 1, 2007
Method for the prediction of the performance of HF circuits
A description is not available for this item.
ITU-R P.533
January 1, 2005
HF propagation prediction method*
A description is not available for this item.
ITU-R P.533
January 1, 2001
HF Propagation Prediction Method
A description is not available for this item.
P.533-6
January 1, 1999
HF Propagation Prediction Method
A description is not available for this item.
P.533-5
January 1, 1995
HF Propagation Prediction Method
A description is not available for this item.
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References

This document is referenced by:
ITU-R F.2119 - Guidance on technical parameters and methodologies for sharing and compatibility studies related to fixed and land mobile services in the frequency range 1.5-30 MHz
Published by ITU-R on January 1, 2019
This Recommendation gives guidance to perform sharing studies related to systems in the fixed and land mobile services in the frequency range 1.5-30 MHz. It establishes a list of parameters, that...
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