Const = physconst(Name)
Character vector that indicates which physical constant the function returns. Values are not case sensitive.
Value of physical constant specified in the input argument
The following table lists the supported constants and their values in SI units.
|Speed of light in vacuum||299,792,458 m/s. Most commonly denoted by c.|
|Boltzmann constant relating energy to temperature||J/K. Most commonly denoted by k.|
|Mean radius of the Earth||6,371,000 m|
Determine the wavelength of a 1 Ghz electromagnetic wave.
freq = 1e9; lambda = physconst('LightSpeed')/freq
lambda = 0.2998
Approximate the thermal noise power per unit bandwidth in the I and Q channels of a receiver.
Specify the receiver temperature and Boltzmann constant.
T = 290; k = physconst('Boltzmann');
Compute the noise power per unit bandwidth, split evenly between the in-phase and quadrature channels.
Noise_power = 10*log10(k*T/2);