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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.

Retired package: Release invalid - source build broken: nonexistent core git tag; precompiled path works; upgrade to >= 0.25.0
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sidereon native sidereon_nif src look_angle.rs
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native/sidereon_nif/src/look_angle.rs 

//! Rustler boundary for high-level TLE look-angle prediction.

//!

//! The propagation and topocentric geometry live in `sidereon_core::astro::passes`;

//! this module only decodes Sidereon terms and maps errors to the existing public

//! shape.



use crate::passes::instant_from_datetime_tuple;

use crate::propagation::elements_from_map;

use rustler::{Encoder, Env, NifResult, Term};

use sidereon_core::astro::passes::{look_angle, GroundStation, LookAngleError};



pub(crate) fn tle_look_angle_impl<'a>(

    env: Env<'a>,

    tle_map: Term<'a>,

    station_latitude_deg: f64,

    station_longitude_deg: f64,

    station_altitude_m: f64,

    datetime: Term<'a>,

) -> NifResult<Term<'a>> {

    let ok = rustler::types::atom::Atom::from_str(env, "ok")?;

    let error = rustler::types::atom::Atom::from_str(env, "error")?;



    let elements = elements_from_map(env, tle_map)?;

    let instant = instant_from_datetime_tuple(datetime)?;

    let station = GroundStation {

        latitude_deg: station_latitude_deg,

        longitude_deg: station_longitude_deg,

        altitude_m: station_altitude_m,

    };



    match look_angle(&elements, station, instant) {

        Ok(look) => Ok((ok, (look.azimuth_deg, look.elevation_deg, look.range_km)).encode(env)),

        Err(LookAngleError::Init(err)) => Ok((error, format!("SGP4 init: {err}")).encode(env)),

        Err(LookAngleError::Propagate(err)) => {

            Ok((error, format!("SGP4 propagate: {err}")).encode(env))

        }

        Err(LookAngleError::InvalidInput { .. }) => {

            let reason = rustler::types::atom::Atom::from_str(env, "invalid_input")?;

            Ok((error, reason).encode(env))

        }

        Err(LookAngleError::FrameTransform(_)) => {

            let reason = rustler::types::atom::Atom::from_str(env, "frame_transform_failed")?;

            Ok((error, reason).encode(env))

        }

    }

}