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Table 1 LS estimators based on TOAs for locating an asynchronous target

From: Reference-free time-based localization for an asynchronous target

  REFF-USR-LS REFB-USR-LS REFF-USRD-LS REFB-USRD-LS(1) REFB-USRD-LS(2)
Relations   The REFF-USR-LS and the REFF-USRD-LS estimate are identical The REFB-USR-LS and the REFB-USRD-LS(2) estimate are identical
No. of references 0 2 0 1 2
Reference dependency No Yes No Yes Yes
Literature Proposed [5, 17, 18] Proposed [7, 22] [15]
Min. no. of anchors, x of length l    l + 2