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Regional Information Meeting and Workshop related to the RRC-06 for the administrations of the African countries Dakar, Senegal, 25-29 April 2005. RRC Propagation Information Field strength prediction method. Pham Nhu Hai Radiocommunication Bureau. Outline. Overview – propagation models

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rrc propagation information field strength prediction method

Regional Information Meeting and Workshop related to the RRC-06 for the administrations of the African countriesDakar, Senegal, 25-29 April 2005

RRC Propagation Information

Field strength prediction method

Pham Nhu Hai

Radiocommunication Bureau

outline
Outline
  • Overview – propagation models
  • RRC propagation curves/tables
  • RRC propagation zones
  • Propagation prediction method
  • Propagation for other services

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

propagation models
Propagation models
  • Path specific
    • Terrain data
    • Time consuming
    • Accurate but no agreed methods for broadcasting
  • Path general
    • General terrain data required (effective heights)
    • Fast easy to use
    • ITU conference (ITU-R P 370, 529, 1146 and 1546)

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

one propagation model
One propagation model!
  • ITU-R P.1546 replaces
    • ITU-R P.370 (BC VHF/UHF)
    • ITU-R P.529 (LM VHF/UHF)
    • ITU-R P.1146 (LM & BC, 1-3 GHz)
  • Path general methods
  • 30 MHz – 3000 MHz
  • 1 km – 1000 km
  • 1% - 50% percentage of time

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

rrc propagation model
RRC propagation model
  • Set of propagation curves/tables of field strength (dBu) vs distance (km)
    • Heights of transmitting/base antenna
    • 100, 600 and 2000 MHz
    • 1%, 10% and 50%
    • Receiving antenna height of 10m in open area
  • Detailed inter/extrapolation procedures
    • Other percentage of time
    • Other frequencies
    • Other transmitting/base antenna heights

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

rrc propagation zones
RRC propagation zones

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

600 mhz 50 land temperate
600 MHz, 50% Land temperate

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

600 mhz 1 land temperate
600 MHz, 1% Land temperate

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

600 mhz 1 warm seas
600 MHz, 1% warm seas

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

propagation prediction method
Propagation prediction method
  • Maximum field strength values
  • Determine transmitting/base antenna height
  • Interpolation of field strength as a function of
    • Transmitting/base height h1
    • Distance
    • Frequency
    • Percentage of time

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

propagation prediction method 2
Propagation prediction method (2)
  • Mixed paths
  • Correction for receiving/mobile antenna height
  • Correction of terrain clearance angle
  • Location variability in land area-coverage prediction
  • FS prediction in 16 easy steps!!!!

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

transmitting base antenna height h 1
Transmitting/base antenna height h1
  • Land paths >= 15 km
    • h1= heff (height over average terrain 3-15 km)
  • Land paths < 15 km
    • h1=ha (height of the mast) for d<=3km
    • h1= ha + (heff-ha)(d-3)/12 for 3 <d<15 km
  • Sea paths
    • h1= heff for h1 >=1 m

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

field strength for a height h 1
Field strength for a height h1
  • h1 <> 10, 20, 75,….., 1200 m
  • h1 in the range 10 – 3000 m

E = Einf +

(Esup-Einf)log(h1/hinf)/log(hsup/hinf)

    • hinf = 600 ifh1> 1200
    • hsup = 1200 ifh1> 1200
  • h1 in the range 0 – 10 m
  • Negative h1 (terrain clearance angle)

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

field strength f distance
Field strength = f (distance)
  • If d does not coincide with one of the tabulation distances

E = Einf +

(Esup-Einf)log(d/dinf)/log(dsup/dinf)

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

field strength f frequency
Field strength = f (frequency)
  • If freq does not coincide with one of the nominal values (100, 600)

E = Einf +

(Esup-Einf)log(f/finf)/log(fsup/finf)

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

mixed path consideration
ITU-R P.370

Based on percentage of land and sea path

Shows unrealistic “recovery effect”

Sea curves show large variation wrt effective heights

RRC (P.1546)

Longest contiguous path is important (breaking down ducting)

Avoid “recovery effect”

Consistent set of sea curves

Mixed path consideration

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

fs prediction in 16 easy steps
FS prediction in 16 easy steps!!!

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

conclusions
Conclusions
  • One propagation model
  • Based on ITU-R P.1546
  • Data available in curves and tables
  • Better prediction for sea paths
  • Step-by-step FS prediction method
  • TGFC……………..

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

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