Efficient Underwater RSS Value to Distance Inversion Using the Lambert Function

Figure 1

The Lambert 𝑊 function is the inverse of 𝑤↦𝑤𝑒^𝑤. For 𝑧<0, it is multivalued and/or complex, but it is 1-to-1 between 𝑧≥0 and 𝑤≥0.