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Long base line interferometry: a new technique.

N W Broten, T H Legg, J L Locke

Science (New York, N.Y.)

|June 23, 1967

Summary

Magnetic-tape recorders and atomic frequency standards enabled phase-coherent interferometry between two distant radio telescopes without a direct radio link. This successful test occurred at the Algonquin Radio Observatory.

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Area of Science:

Astronomy
Astrophysics
Radio Astronomy

Background:

Radio telescopes require precise timing for interferometry.
Operating widely separated telescopes as a single interferometer presents synchronization challenges.
Lack of a direct radio-frequency link hinders phase coherence.

Purpose of the Study:

To test a novel technique for achieving phase coherence between distant radio telescopes.
To demonstrate the feasibility of using magnetic-tape recorders and atomic frequency standards for this purpose.

Main Methods:

Utilized magnetic-tape recorders for data synchronization.
Employed atomic frequency standards for precise timing.
Operated two radio telescopes as a phase-coherent interferometer.
Conducted tests at the National Research Council of Canada's Algonquin Radio Observatory.

Main Results:

Successfully operated two widely separated radio telescopes as a phase-coherent interferometer.
Demonstrated the effectiveness of magnetic-tape recorders and atomic frequency standards in achieving synchronization.
Proved the viability of the technique in the absence of a radio-frequency connecting link.

Conclusions:

The tested technique is effective for establishing phase coherence in radio interferometry over large distances.
This method allows for enhanced resolution and sensitivity in radio astronomy observations.
The successful test opens new possibilities for long-baseline interferometry.