For long-lived sources, however, a single antenna synthesizes many antennas by observing the source at
different points along its orbit around the sun. The baseline for such observations is 2 AU, so that, for a
source emitting radiation at 1 kHz, the resolution is as good as , which is smaller than an
arcsecond.
For space-based detectors orbiting the sun, like LISA, the baseline is again 2 AU, but the observing
frequency is some five or six orders of magnitude lower, so the basic resolution is only of order 1 radian.
However, as we shall see later, some of the sources that a space-based detector will observe have huge
amplitude SNRs in the range of SNR 103 – 104, which improves the resolution to arcminute accuracies
in the best cases.
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