Ћекции.ќрг


ѕоиск:




 атегории:

јстрономи€
Ѕиологи€
√еографи€
ƒругие €зыки
»нтернет
»нформатика
»стори€
 ультура
Ћитература
Ћогика
ћатематика
ћедицина
ћеханика
ќхрана труда
ѕедагогика
ѕолитика
ѕраво
ѕсихологи€
–елиги€
–иторика
—оциологи€
—порт
—троительство
“ехнологи€
“ранспорт
‘изика
‘илософи€
‘инансы
’ими€
Ёкологи€
Ёкономика
Ёлектроника

 

 

 

 


F.3 Gaseous absorption for a troposcatter path




This section gives the method for calculating gaseous absorption for a complete troposcatter path, from transmitter to receiver via the common scattering volume.

Use the method in І F.4, with hrho = hts, q elev = q tpos, dcv = dtcv, to give the gaseous attenuations due to oxygen, and for water vapour under both non-rain and rain conditions, for the transmitter/common-volume path, where hts, q tpos, and dtcv appear in Table 3.1. Save the values calculated by equations (F.4.3a) to (F.4.3c) according to:

dB (F.3.1a)

dB (F.3.1b)

dB (F.3.1c)

Use the method in section F.4, with hrho = hrs, q elev = q rpos, dcv = drcv to give the gaseous attenuations due to oxygen, and for water vapour under both non-rain and rain conditions, for the receiver/common-volume path, where hrs, q rpos, and drcv appear in Table 3.1. Save the values calculated by equations (F.4.3a) to (F.4.3c) according to:

dB (F.3.2a)

dB (F.3.2b)

dB (F.3.2c)

The gaseous attenuations due to oxygen and for water vapour under both non-rain and rain conditions, for the complete troposcatter path are now given by:

dB (F.3.3a)

dB (F.3.3b)

dB (F.3.3c)

F.4 Gaseous absorption for terminal/common-volume troposcatter path

This section gives the method for calculating gaseous attenuation under non-rain conditions for the path from one terminal to the common volume of a troposcatter path.

The inputs are height for water-vapour density hrho masl, elevation angle of path q elev mrad, and horizontal distance to the common volume dcv km.

The outputs are the attenuations due to oxygen, and due to water vapour under both non-rain and rain conditions, for the terminal/common-volume path, Ao, Aw and Awr, in dB.

Obtain surface water-vapour density r sur at the terminal from the data file Уsurfwv_50_fixed.txtФ.

Use equation (F.6.2) to calculate the sea-level specific attenuation due to water vapour under non‑rain conditions, g w, dB/km.

Use equation (F.5.1) to calculate the surface water-vapour density under rain conditions, r surr, g/m−3.

Re-evaluate r sur according to r sur = r surr.

Use equation (F.6.2) to calculate the sea-level specific attenuation due to water vapour under rain conditions, g wr, dB/km.

Calculate the quantities do and dw for oxygen and water vapour:

(F.4.1a)

(F.4.1b)

Calculate the effective distances d e o and dew for oxygen and water vapour:

km (F.4.2a)

km (F.4.2b)

The attenuations due to oxygen, and for water vapour under both non-rain and rain conditions, for the terminal/common-volume path are now given by:

km (F.4.3a)

km (F.4.3b)

km (F.4.3c)

where g o, the sea-level specific attenuation due to oxygen, appears in Table 3.1.





ѕоделитьс€ с друзь€ми:


ƒата добавлени€: 2016-11-18; ћы поможем в написании ваших работ!; просмотров: 365 | Ќарушение авторских прав


ѕоиск на сайте:

Ћучшие изречени€:

≈сли президенты не могут делать этого со своими женами, они делают это со своими странами © »осиф Ѕродский
==> читать все изречени€...

742 - | 679 -


© 2015-2023 lektsii.org -  онтакты - ѕоследнее добавление

√ен: 0.008 с.