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Table 4 LS, WLS, and CWLS estimators based on TDOAs for locating an asynchronous target

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

  REFB-USRD-LS(1) REFB-USRD-WLS(1) REFB-USRD-LS(2) REFB-USRD-WLS(2) REFB-SRD-CWLS
Relations The REFB-USRD-WLS(1) and the REFB-USRD-WLS(2) estimate are identical with the optimal weighting matrices Q ˜ i * = Q ˜ i , j *
No. of references 1 1 2 2 1
Reference dependency Yes Yes Yes Yes Yes
Literature [19, 22, 32, 33, 36] [21] [20] [20] [4, 26]
Min. no. of anchors, x of length l    l + 2