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# 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.

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