Time Reversal or Beamforming

Time reversal (TR) is a specific physical process that has been applied to locate a source using data and models.
In this localization process, it is akin to generalized beamforming which is also referred to as Matched-Field Processing (MFP) in the ocean acoustic literature. An potential advantage of MFP is that it is a broader methodology that may improve the localization outcome and/or provide some tolerance for models that are not a total match for the real environment. With TR as the basis, beamforming and MFP are discussed in theory and example. The emphasis will be on robust MFP localization methods that are tolerant to model mismatch.