Implements the US Standard Atmosphere 1976 for density and speed of sound.

Classes¶

AtmosphereTable¶

Precomputed lookup table for atmospheric properties.

@dataclass(frozen=True, slots=True)
class AtmosphereTable:
    z_m: Array    # Altitude grid [m]
    rho: Array    # Density [kg/m³]
    cs: Array     # Speed of sound [m/s]

Methods:

• rho_at(h_m) - Interpolate density at altitude \(h\)
• cs_at(h_m) - Interpolate speed of sound at altitude \(h\)

Functions¶

build_atmosphere_table¶

Build the lookup table from USSA76 data.

def build_atmosphere_table(
    *, 
    z_max_m: float = 300_000, 
    dz_m: float = 100
) -> AtmosphereTable:

Parameters:

Equation Reference¶

Eq. 15: Density interpolation $$ \rho(h) = \text{Interp}(h, \text{USSA76}_\rho) $$

Eq. 16: Drag force $$ D = \frac{1}{2}\rho v^2 C_D A_{\text{ref}} $$