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Table 2 WLS estimators based on TOAs for locating an asynchronous target

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

Relations   The REFB-USR-WLS and the REFB-USRD-WLS(2) estimate are identical They are all identical with optimal weighting matrices Q * = Q i , j * = Q i *
No. of references 0 2 0 1 2
Reference dependency No Yes, with Qi,j No Yes, with Q i Yes, with Qi,j
   No, with Q i , j *   No, with Q i * No, with Q i , j *
Literature Proposed   Proposed   
Min. no. of anchors, x of length l    l+2