International Standard Atmospheric (ISA) model
Only metric units are used.
Functions
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T_K Atmospheric temperature [K]
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p_Pa Air pressure [Pa]
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ρ_kg_m³ Air density [kg/m³]
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a_m_s Speed of sound [m/s]
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Vcas2Vtas True airspeed Vtas [m/s] as a function of the calibrated airspeed Vcas [m/s]
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Vtas2Vcas Calibrated airspeed Vcas [m/s] as a function of the True airspeed Vtas [m/s]
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M2Vtas True airspeed Vtas [m/s] as a function of the Mach number
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Vtas2M Mach as a function of the True airspeed Vtas [m/s]
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M2Vcas Calibrated airspeed Vcas [m/s] as a function of the Mach number
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Vtas2M Mach as a function of the True airspeed Vtas [m/s]
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Hp_trans_m Transition altitude [m]
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conditions returns AtmosConditions
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θ temperature ratio
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δ pressure ratio
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σ density ratio
Constants
- T₀_K Standard atmospheric temperature [K] at Mean Sea Level (MSL)
- p₀_Pa Standard atmospheric pressure [Pa] at Mean Sea Level (MSL)
- ρ₀_kg_m³ Standard atmospheric density [kg/m³] at Mean Sea Level (MSL)
- a₀_m_s Speed of sound [m/s] at Mean Sea Level (MSL)
- g₀_m_s² Graviation acceleration [m/s²]
- Hp_trop_m Geopotential pressure altitude [m] of Tropopause
Type
- AtmosConditions: Hp_m, T_K, p_Pa, ρ_kg_m³, a_m_s
Source: EUROCONTROL BADA 4 User Manual Chapter 2.2 Atmosphere Model