Constants.h

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/* Copyright (c) 2015-2023 Skyward Experimental Rocketry
 * Authors: Alain Carlucci, Emilio Corigliano
 *
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 */
 
#pragma once
 
namespace Boardcore
{
 
namespace Constants
{
 
static constexpr float PI                 = 3.14159265f;  // [rad]
static constexpr float DEGREES_TO_RADIANS = PI / 180.0f;
static constexpr float RADIANS_TO_DEGREES = 180.0f / PI;
static constexpr float PSI_TO_PASCAL      = 6894.76f;  // [Pa / psi]
 
static constexpr float g = 9.80665f;  // [m^s^2]
 
static constexpr float TROPOSPHERE_HEIGHT = 11000.f;  // Troposphere height [m]
static constexpr float a = 0.0065f;  // Troposphere temperature gradient [deg/m]
static constexpr float R = 287.05f;  // Air gas constant [J/Kg/K]
static constexpr float n = g / (R * a);
static constexpr float nInv = (R * a) / g;
 
static constexpr float CO    = 340.3;  // Sound speed at ground altitude [m/s]
static constexpr float ALPHA = -3.871e-3;  // Sound speed gradient [1/s]
static constexpr float RHO_0 = 1.225;      // Air density at sea level [kg/m^3]
static constexpr float GAMMA_AIR = 1.4f;   // Adiabatic constant for air [1]
static constexpr float Hn        = 10400.0;  // Scale height [m]
 
static constexpr float MSL_PRESSURE    = 101325.0f;  // [Pa]
static constexpr float MSL_TEMPERATURE = 288.15f;    // [Kelvin]
 
static constexpr float gpsLatConst =
    111132.95225;  
static constexpr float gpsLonConst =
    111412.87733;  
 
static constexpr float B21_LATITUDE  = 45.501141;
static constexpr float B21_LONGITUDE = 9.156281;
}  // namespace Constants
 
}  // namespace Boardcore