Australian baselines measured by radio interferometry

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Abstract
The 250–2500 km distances between radio telescopes located near Canberra, Parkes, Sydney, Hobart and Alice Springs were determined from radio interferometric observations of extragalactic sources. The observations were made during two 24-hour sessions on 26th April and 3rd May, 1982, and one 12-hour night-time session on 28th April, 1982. The 275 km Tidbinbilla (Canberra)-Parkes baseline length was measured with a precision of ±3 cm. The remaining baseline lengths were measured with precisions ranging from ±7 cm to ±.7 m. The higher precisions were achieved for the better instrumented sites of Tidbinbilla, Parkes and Fleurs (Sydney). The measurement accuracies are estimated to be about a factor of two larger than the precisions. The data reduction technique is briefly described and the baseline results are presented in this paper.

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