Comments on "A Linear Closed-Form Algorithm for Source Localization From Time-Differences of Arrival"

In a recent letter by Gillette and Silverman, a linear closed-form algorithm (the GS algorithm) for source localization from time-differences of arrival is proposed. It is claimed that ldquoit is so simple that we were surprised that, until very recently, there have been no other solutions similar to ours.rdquo This comment has two objectives. We point out imprecisions of statement, and we give additional references of closely related works, some of them presenting the same results.