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use crate::{constants::SPEED_OF_LIGHT_M_S, prelude::Error};
#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
#[derive(Debug, Clone, Copy, Default, PartialEq, PartialOrd, Eq, Ord, Hash)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub enum Carrier {
/// [Carrier::L1] (1575.42) (GPS +QZSS +SBAS +Galileo +BDS)
#[default]
L1,
/// [Carrier::L2] (1227.60) (GPS +QZSS)
L2,
/// [Carrier::L5] (1176.45) (GPS +QZSS +SBAS +IRNSS)
L5,
/// [Carrier::E5b] (1207.140) (Galileo)
E5b,
/// [Carrier::E5a5b] (1191.795) (Galileo +BDS)
E5a5b,
// /// [Carrier::E6Lex] (1278.75) (Galileo +QZSS)
// E6Lex,
/// [Carrier::B1] (1561.098) (BDS)
B1,
/// [Carrier::B3] (1268.52) (BDS)
B3,
// /// [Carrier::S] (2492.028) (IRNSS)
// S,
//
// /// [Carrier::G1] (1602.00) (Glonass)
// G1,
//
// /// [Carrier::G1a] (1600.995) (Glonass)
// G1a,
//
// /// [Carrier::G2] (1246.00) (Glonass)
// G2,
//
// /// [Carrier::G2a] (1248.06) (Glonass)
// G2a,
//
// /// [Carrier::G3] (1202.025) (Glonass)
// G3,
}
impl std::fmt::Display for Carrier {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
match self {
Self::L1 => write!(f, "L1"),
Self::L2 => write!(f, "L2"),
Self::L5 => write!(f, "L5"),
Self::E5b => write!(f, "E5b"),
Self::E5a5b => write!(f, "E5a5b"),
// Self::E6Lex => write!(f, "E6/LEX"),
Self::B1 => write!(f, "B1"),
Self::B3 => write!(f, "B3"),
// Self::S => write!(f, "S"),
// Self::G1 => write!(f, "G1"),
// Self::G1a => write!(f, "G1a"),
// Self::G2 => write!(f, "G2"),
// Self::G2a => write!(f, "G2a"),
// Self::G3 => write!(f, "G3"),
}
}
}
impl std::str::FromStr for Carrier {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let trimmed = s.trim();
let lowered = trimmed.to_lowercase();
match lowered.as_str() {
"l1" => Ok(Self::L1),
"l2" => Ok(Self::L2),
"l5" => Ok(Self::L5),
"e5b" => Ok(Self::E5b),
"e5a5b" => Ok(Self::E5a5b),
"b1" => Ok(Self::B1),
"b3" => Ok(Self::B3),
// "s" => Ok(Self::S),
// "g1" => Ok(Self::G1),
// "g1a" => Ok(Self::G1a),
// "g2" => Ok(Self::G2),
// "g2a" => Ok(Self::G2a),
// "g3" => Ok(Self::G3),
// "e6" | "lex" | "e6/lex" => Ok(Self::E6Lex),
_ => Err(Error::InvalidFrequency),
}
}
}
impl Carrier {
/// Build a new [Carrier] frequency from value in MHz.
/// This requires a 1kHz accuracy on the description.
pub fn from_frequency_mega_hz(freq_mhz: f64) -> Result<Self, Error> {
if freq_mhz.is_sign_negative() {
return Err(Error::InvalidFrequency);
}
let freq_khz = (freq_mhz * 1.0E3) as u32;
match freq_khz {
1575_420 => Ok(Self::L1),
1227_600 => Ok(Self::L2),
1176_450 => Ok(Self::L5),
1207_140 => Ok(Self::E5b),
1191_795 => Ok(Self::E5a5b),
// 1278_750 => Ok(Self::E6Lex),
1561_098 => Ok(Self::B1),
1268_520 => Ok(Self::B3),
// 2492_028 => Ok(Self::S),
// 1602_000 => Ok(Self::G1),
// 1600_995 => Ok(Self::G1a),
// 1246_000 => Ok(Self::G2),
// 1248_060 => Ok(Self::G2a),
// 1202_025 => Ok(Self::G3),
_ => Err(Error::UnknownCarrierFrequency),
}
}
pub(crate) fn is_l1(&self) -> bool {
matches!(*self, Self::L1 | Self::B1)
}
// /// Returns unsigned frequency in kHz
// pub(crate) fn to_khz_unsigned(&self) -> u32 {
// let freq_mhz = self.frequency_mega_hz() * 1.0E3;
// freq_mhz as u32
// }
/// Converts [Carrier] to exact frequency in Mhz with 1kHz garanteed accuracy.
pub fn frequency_mega_hz(&self) -> f64 {
match self {
Self::L1 => 1575.420_f64,
Self::L2 => 1227.600_f64,
Self::L5 => 1176.450_f64,
Self::E5b => 1207.140,
Self::E5a5b => 1191.795,
// Self::E6Lex => 1278.750,
Self::B1 => 1561.098,
Self::B3 => 1268.520,
// Self::S => 2492.028,
// Self::G1 => 1602.000,
// Self::G1a => 1600.995,
// Self::G2 => 1246.000,
// Self::G2a => 1248.060,
// Self::G3 => 1202.025,
}
}
pub fn frequency_hz(&self) -> f64 {
self.frequency_mega_hz() * 1.0E6
}
pub fn wavelength(&self) -> f64 {
SPEED_OF_LIGHT_M_S / self.frequency_hz()
}
}
/// Signal used in [PVTSolution] resolution
#[derive(Debug, Clone)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub enum Signal {
Single(Carrier),
Dual((Carrier, Carrier)),
}
impl Default for Signal {
fn default() -> Self {
Self::Single(Default::default())
}
}
impl std::fmt::Display for Signal {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
match self {
Self::Single(carrier) => write!(f, "{carrier}"),
Self::Dual((lhs, rhs)) => write!(f, "{rhs}/{lhs}"),
}
}
}
// impl Signal {
// pub(crate) fn single(carrier: Carrier) -> Self {
// Self::Single(carrier)
// }
// pub(crate) fn dual(lhs: Carrier, rhs: Carrier) -> Self {
// Self::Dual((lhs, rhs))
// }
// }
#[cfg(test)]
mod test {
use super::Carrier;
use std::str::FromStr;
#[test]
fn test_frequencies() {
for carrier in [
Carrier::L1,
Carrier::L2,
Carrier::L5,
Carrier::E5b,
Carrier::E5a5b,
// Carrier::E6Lex,
Carrier::B1,
Carrier::B3,
// Carrier::S,
// Carrier::G1,
// Carrier::G1a,
// Carrier::G2,
// Carrier::G2a,
// Carrier::G3,
] {
let freq_mhz = carrier.frequency_mega_hz();
let identified = Carrier::from_frequency_mega_hz(freq_mhz).unwrap_or_else(|e| {
panic!("{e} - failed to identify carrier from frequency: {freq_mhz} Mhz")
});
assert_eq!(
identified, carrier,
"Carrier frequency API: invalid for {freq_mhz} frequency",
);
let formatted = carrier.to_string();
let parsed = Carrier::from_str(&formatted).unwrap_or_else(|e| {
panic!("{e} - failed to identify Carrier from \"{formatted}\"")
});
assert_eq!(
parsed, carrier,
"Carrier string API: invalid for {carrier} frequency",
)
}
}
}