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Capability

Multi-Source Observation

Observe through more than one source.

Evidence levelE1Architecture Defined

See How Correlation Works

The functional gap

A single view of the sky answers one question and hides three. A source that sees an object says nothing about the objects it cannot see, and a source that is silent may be blind rather than empty.

From inputs to outputs

Takes in

  • Observations from passive radar, RF and optical sources
  • The identity and family of each source
  • The time each observation was made

Does

Keeps every observation attached to the source that made it, and records which sources were looking, not only which ones saw something.

Hands on

  • Observations that carry their source
  • A record of which sources were present
  • Gaps stated as gaps
Source presence: Data table
ItemValue
Source AContributes
Source BContext only
Source CNot yet available
Source presence RD03Data status: IllustrativeEvidence level: E0 · ConceptQuestion answered: Which sources contribute to this state?Three source markers connect to one state and carry a text status each. A source being present does not mean it is trusted; the label says what it contributes.Limitation: Sources are generic and their positions are not geographic.

A worked example

Three steps from a synthetic scenario, in relative terms.

A worked example Synthetic example
StepWhat is seenWhat is stated
1Source A reports an objectOne source holds it
2Source B was listening and heard nothingAbsence is recorded, not erased
3Source C was offlineIts silence says nothing about the object
  • Source A
  • Source B
  • Source C
Comparing sources: Data table
ItemSource ASource BSource C
Agreement825870
Freshness648852
Completeness907060
Comparing sources CH03Data status: Synthetic dataEvidence level: E0 · ConceptQuestion answered: How do sources compare?A dot plot places three example sources on three measures, agreement, freshness and completeness, so that the sources can be read side by side without a spider chart.Limitation: The three measures are relative scores in an example, not benchmarks.

Confidence and uncertainty in this function

Confidence rises with the number of independent sources that agree, and it is not raised by a source that merely repeats another.

Evidence and maturity

This page claims nothing above the level of the projects it rests on.

Where it applies

What this does not claim

  • Acoustic sensing is named only as a possibility where it applies; no project supports it.
  • The page describes the function, not the range or sensitivity of any source.
  • More sources widen what can be seen; they do not remove the need to state what was not seen.

Projects behind this

Technology