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sidereon

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Satellite toolkit for Elixir with SGP4 propagation, coordinate transforms, GNSS positioning, orbit determination, conjunction assessment, pass prediction, and a Rust NIF backend.

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sidereon lib sidereon gnss core constants.ex
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lib/sidereon/gnss/core/constants.ex 

defmodule Sidereon.GNSS.Core.Constants do

  @moduledoc false



  alias Sidereon.Constants, as: SidereonConstants

  alias Sidereon.GNSS.IonosphereFree



  @ca_code_length 1023

  @ca_chip_rate_hz 1_023_000

  @time_scales ~w(UTC TAI TT TDB GPST GST BDT)



  def speed_of_light_m_s, do: SidereonConstants.speed_of_light_m_s()

  def earth_rotation_rate_rad_s, do: SidereonConstants.omega_e_dot_rad_s()

  def gps_l1_hz, do: frequency!("G", :l1)

  def gps_l2_hz, do: frequency!("G", :l2)

  def galileo_e1_hz, do: frequency!("E", :e1)

  def galileo_e5a_hz, do: frequency!("E", :e5a)

  def beidou_b1i_hz, do: frequency!("C", :b1i)

  def beidou_b3i_hz, do: frequency!("C", :b3i)

  def ca_code_length, do: @ca_code_length

  def ca_chip_rate_hz, do: @ca_chip_rate_hz

  def time_scales, do: @time_scales



  def carrier_frequencies_hz, do: IonosphereFree.frequencies()



  defp frequency!(system, band) do

    {:ok, frequency_hz} = IonosphereFree.frequency(system, band)

    frequency_hz

  end

end