Utilities - ephemerista.comms.utils

The utils.py module.

This module provides various utilities and physical constants for link budget calculations.

ephemerista.comms.utils.BOLTZMANN_CONSTANT: float = 1.38064852e-23

Average room temperature in K

ephemerista.comms.utils.ROOM_TEMPERATURE = 290

The speed of light in vacuum in m/s

ephemerista.comms.utils.free_space_path_loss(distance, frequency)

Calculate the free-space path loss for a given frequency and distance.

Parameters:

  • distance (float) – Distance in km

  • frequency (float) – Frequency in Hz

Returns:

Free-space path loss in dB

Return type:

float

ephemerista.comms.utils.frequency_band(freq)

Return the corresponding frequency band for a given frequency.

Return type:

Optional[Literal['HF', 'VHF', 'UHF', 'L', 'S', 'C', 'X', 'Ku', 'K', 'Ka', 'V', 'W']]

ephemerista.comms.utils.from_db(val)

Convert from decibel.

Return type:

ndarray | float

ephemerista.comms.utils.to_db(val)

Convert a given value to decibel.

Return type:

Union[Buffer, _SupportsArray[dtype[Any]], _NestedSequence[_SupportsArray[dtype[Any]]], bool, int, float, complex, str, bytes, _NestedSequence[Union[bool, int, float, complex, str, bytes]]]

ephemerista.comms.utils.wavelength(frequency)

Return the wavelength of electromagnetic radiation of a given frequency.

Return type:

float