Content Comparison

Variation

-

boolean

-

Variation in path loss takes into account the uncertainty of building design, furniture, room size, etc.

Diffraction

-

boolean

-

Select the diffraction component of the model

Tropospheric scatter

-

boolean

-

Select the tropospheric scatter component of the model

Ducting/layer reflection

-

boolean

-

Select the ducting/layer reflection component of the model

Water concentration

ρ

S

g/m³

water vapour density for tropospheric study only

Surface pressure

P

S

hPa

Surface pressure (default 1013.25 hPa)

Refraction index gradient

ΔN

S

1/km

It is the average radio-refractive index lapse-rate through the lowest 1 km of the atmosphere, provides the data upon which the appropriate effective Earth radius can be calculated. Note that ΔN is a positive quantity.

Surface temperature

T

S

Degree Celsius

Surface temperature (default 15 degree Celsius)

Latitude

φ_t, φ_r

S

Degree

Latitude of station, used in the path centre location calculation

Additional clutter loss at the Tx

A_ht

S

dB

Additional clutter loss at the Tx

Additional clutter loss at the Rx

A_hr

S

dB

Additional clutter loss at the Rx

Antenna gain at the Tx

G_t

S

dB

Antenna gain of the Tx in the direction of the horizon along the great-circle interference path (dBi)

Antenna gain at the Rx

G_r

S

dB

Antenna gain of the Rx in the direction of the horizon along the great-circle interference path (dBi)

Sea level surface refractivity

N₀

S

-

The sea-level surface refractivity, is used only by the troposcatter model as a measure of location variability of the troposcatter scatter mechanism. As the scatter path calculation is based on a path geometry determined by annual or worst-month values of ΔN, there is no additional need for worst-month values of N₀. The correct values of ΔN and N₀ are given by the path-centre values as derived from the appropriate maps.

Time Percentage

D

%

Percentage time variability from which the field strengths value are exceeded