oem 0.1.1

Python Orbital Ephemeris Message (OEM) tools

Python Orbital Ephemeris Message tools

Python tools for working with Orbital Ephemeris Messages (OEMs).

Development Status

Installation

The oem package is available through pip.

pip install oem

Usage

The OrbitalEphemerisMessage class is the primary interface for OEM Files.

from oem import OrbitalEphemerisMessage

ephemeris = OrbitalEphemerisMessage.from_ascii_oem(file_path)

Each OEM is made up of one or more segments of state and optional covariance data. The OrbitalEphemerisMessage class provides iterables for both.

for segment in ephemeris:
    for state in segment:
        print(state.epoch, state.position, state.velocity)

    for covariance in segment.covariances:
        print(covariance.epoch, covariance.matrix)

All vectors and matrices are numpy arrays.

It is also possible to retrieve a complete list of states and covariances through the .states and .covariances properties. These attributes streamline interaction with single-segment ephemerides.

for state in ephemeris.states:
    print(state.epoch, state.position, state.velocity)
for covariance in ephemeris.covariances:
    print(covariance.epoch, covariance.matrix)

Reference Standards

This implementation follows the CCSDS recommended standards for Orbit Data Messages.

[1] Orbit Data Messages, CCSDS 502.0-B-2, 2012. Available: https://public.ccsds.org/Pubs/502x0b2c1.pdf

[2] XML Specification for Navigation Data Messages, CCSDS 505.0-B-1, 2010. Available: https://public.ccsds.org/Pubs/505x0b1.pdf