CCSDS CDM¶

Pro

The IO.Astrodynamics.CCSDS.CDM module is a Pro feature.

The CDM module supports constructing, reading, writing, and validating CCSDS Conjunction Data Messages in XML format.

Cdm Object Model¶

Cdm is the root object representing a complete Conjunction Data Message with header, relative metadata, and two object entries.

Static Methods¶

Method	Description
`Cdm.ReadFromFile(path)`	Parse a CDM XML file into a `Cdm` object
`Cdm.ReadFromString(xml)`	Parse a CDM XML string
`Cdm.ReadFromStream(stream)`	Parse from a stream
`Cdm.ValidateSchema(path)`	Validate a CDM file against the CCSDS schema
`Cdm.ValidateSchemaFromXml(xml)`	Validate a CDM XML string against the schema

Instance Methods¶

Method	Description
`WriteToFile(path)`	Serialize the CDM to an XML file
`WriteToString()`	Serialize the CDM to an XML string

Supporting Types¶

Type	Description
`CdmWriter`	Direct object-to-XML writer
`CdmReader`	Direct XML-to-object reader
`CdmValidator`	Schema and content validation

Export from EncounterCase¶

EncounterCase.ToCdm(CdmExportOptions) converts a conjunction assessment result directly into a Cdm object.

CdmExportOptions¶

Property	Type	Description
`Originator`	`string`	Originating organization
`MessageId`	`string`	Unique message identifier
`MessageFor`	`string`	Intended recipient

Unit Conversion¶

The managed API stores values internally in SI units. The CDM writer emits CCSDS-required XML units:

Quantity	Internal (SI)	CDM (XML)
Position (state vector)	m	km
Velocity	m/s	km/s
Miss distance	m	m
Relative position	m	m

Standards-compliant CDM export requires covariance for both participants.

Example¶

using IO.Astrodynamics.CCSDS.CDM;

var cdm = encounter.ToCdm(new CdmExportOptions
{
    Originator = "MyOpsCenter",
    MessageId = "CDM-20260315-001",
    MessageFor = "Protected"
});

cdm.WriteToFile("encounter.cdm.xml");

var validation = Cdm.ValidateSchema("encounter.cdm.xml");
if (!validation.IsValid)
    throw new InvalidOperationException("CDM failed schema validation.");

var parsed = Cdm.ReadFromFile("encounter.cdm.xml");