Package: oacmpy
oacmpyDescriptionThe object ofoacmpyis currently two-fold:to parse CCSDS Data Message files and,to convert them to CZML file forcesium3d mapping framework.CCSDS is a standard for communicating satellite data between operators, but it is generally widely used for any flight dynamics software, and libraryorekit.
(see alsoodmpyandorekit for python).
Here, Data Messages include broadly the Navigation Data Messages but also Conjunction Data Message (CDM). Tracking Data Message (TDM) will not be implemented.The idea behindoacmpyis to keep current tools interfaces. Rather than updating tools with specific CZML features, this module creates the files for Cesium, from your standardized output files.
The generated CZML file is customizable and allow showing:display trajectory (through OEM)illustrating spacecraft attitude motion (through AEM)showing close encounter (through CDM)The approach is different than the use of TLE as no propagation is performed here. The propagation (and hence its accuracy and fidelity) is down to the tool used to generate the initial ephemeris file.UsageExtracting data from Data MessagesOEMfrom oacmpy import ccsds

oem = cc.Oem.Oem("oem.xml", "xml")
oem.get_satellite_list()
oem.get_ephemeris("SATELLITE NAME")  # array list of epoch - position/velocity vectors
oem.get_covariances("SATELLITE NAME")  # array list of covariance parameterCovariance data can be extracted like,cov_data = oem.get_covariances("SATELLITE NAME")[0]
cov_data.get_epoch()  # covariance epoch
cov_data.get_reference_frame() # covariance reference frame
cov_date.get_covariance_matrix()  # covariance matrixAEM (Attitude file)aem = ccsds.Aem.Aem("aem.txt", "kvn")
aem.get_satellite_list()
aem.get_attitudes("SATELLITE NAME")  # array list of epoch - quaternionsCMD (Conjunction file)cdm = ccsds.Cdm.Cdm("cdm.xml", "xml") # conjunction event    
cdm.get_satellite_list()
cdm.get_tca()
cdm.get_miss_distance()
cdm.get_probability()Generation of CZMLThe generation of CZML script for use withCesiumis the main purpose of this lib.
You can ingest different CCSDS data file (e.g., OEM, AEM or CDM) and create a Cesium scene description. This can be
helpful to illustrate satellite trajectory or satellite conjunctions.From Python ConsoleCreate the CZML from OEM and AEM:from oacmpy.czml import CdmToCzml, OemToCzml, ScenarioCzml 
oem1_czml = OemToCzml.OemAemToCzml(oem1, aem1)  # aem1 is optionalAdd conjunction event with CDM:cdm_czml = CdmToCzml.CdmToCzml(cdm)Generate CZML file:start = oem1.get_start_time("SATELLITE NAME").datetime
end = oem1.get_stop_time("SATELLITE NAME").datetime

scenario = ScenarioCzml.ScenarioCzml(start, end)
scenario.add_content(oem1_czml.dump())
scenario.add_content(oem2_czml.dump())
scenario.add_content(cdm_czml.dump())
scenario.create_document([], "scenario.czml")Plotting attributes are customizable, e.g., changing color, material, line with, etc.Command line toolIf you have an OEM file and you do not bother about attitude, or configuring the graphics, you can simply run:python -m aocmpy -i [your-oem-file] -o [output-file.czml][your-oem-file]can include wildcard to process several OEM into a single CZML file.
The file format (KVN or XML) of the OEM file will be guessed with the file extension... image:: ./example/screenshot.pngTestingRun unit tests withpython -m unittest discover --start-directory ../testsReferencesOrbit Data Messages, CCSDS 502.0-B-2, Nov 2009Attitude Data Messages, CCSDS 504.0-B-1, May 2008Conjunction Data Messages, CCSDS 508.0-B-1, June 2013XML SPECIFICATION FOR NAVIGATION DATA MESSAGES, CSDS 505.0-B-1, December 2010