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use crate::{
observation::LliFlags,
observation::SNR,
prelude::{Observable, SV},
};
/// [SignalObservation] is the result of sampling one signal at
/// one point in time, by a GNSS receiver.
#[derive(Default, Clone, Debug, PartialEq, PartialOrd)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub struct SignalObservation {
/// [SV] is the signal source
pub sv: SV,
/// Actual measurement. Unit depends on [Observable].
pub value: f64,
/// [Observable]
pub observable: Observable,
/// Lock loss indicator (when present)
pub lli: Option<LliFlags>,
/// SNR estimate (when present)
pub snr: Option<SNR>,
}
impl SignalObservation {
/// Builds new signal observation
pub fn new(sv: SV, observable: Observable, value: f64) -> Self {
Self {
sv,
observable,
value,
lli: None,
snr: None,
}
}
/// Copy and define [SNR]
pub fn with_snr(&self, snr: SNR) -> Self {
let mut s = self.clone();
s.snr = Some(snr);
s
}
/// [Observation] is said OK when
/// - If LLI is present it must match [LliFlags::OK_OR_UNKNOWN]
/// - If SNR is present, it must be [SNR::strong]
/// - NB: when both are missing, we still return OK.
/// This allows method that Iterate over OK Epoch Data to consider
/// data when SNR or LLI are missing.
pub fn is_ok(self) -> bool {
let lli_ok = self.lli.unwrap_or(LliFlags::OK_OR_UNKNOWN) == LliFlags::OK_OR_UNKNOWN;
let snr_ok = self.snr.unwrap_or_default().strong();
lli_ok && snr_ok
}
/// [Observation::is_ok] with additional SNR criteria to match (>=).
/// SNR must then be present otherwise this is not OK.
pub fn is_ok_snr(&self, min_snr: SNR) -> bool {
if self
.lli
.unwrap_or(LliFlags::OK_OR_UNKNOWN)
.intersects(LliFlags::OK_OR_UNKNOWN)
{
if let Some(snr) = self.snr {
snr >= min_snr
} else {
false
}
} else {
false
}
}
}