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AP_Math: Create Standard Sea Level variables 

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>
This commit is contained in:
Patrick José Pereira 2018-05-10 23:25:02 -03:00 committed by Francisco Ferreira
parent 54ab0b9099
commit 1ca6647b2e
1 changed files with 6 additions and 3 deletions
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9
libraries/AP_Math/definitions.h
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@ -71,15 +71,18 @@ static const double WGS84_B = (WGS84_A * (1 - WGS84_F));
static const double WGS84_E = (sqrt(2 * WGS84_F - WGS84_F * WGS84_F));
#endif
// air density at 15C at sea level in kg/m^3
#define AIR_DENSITY_SEA_LEVEL 1.225f
#define C_TO_KELVIN 273.15f
// Gas Constant is from Aerodynamics for Engineering Students, Third Edition, E.L.Houghton and N.B.Carruthers
#define ISA_GAS_CONSTANT 287.26f
#define ISA_LAPSE_RATE 0.0065f
// Standard Sea Level values
// Ref: https://en.wikipedia.org/wiki/Standard_sea_level
#define SSL_AIR_DENSITY 1.225f // kg/m^3
#define SSL_AIR_PRESSURE 101325.01576f // Pascal
#define SSL_AIR_TEMPERATURE 288.15f // K
/*
use AP_ prefix to prevent conflict with OS headers, such as NuttX
clock.h