Trilateration, Nonlinear equation solving by Least square minimization.

Hello everybody. I am trying to find position by trilateration and I am using Levenberg Marquardt method. Can anybody advice other method of solving (possible least square minimization method as equations will include some error due to the delay and other stuff.)?

ANY advice is welcome. Thanks in advance. Can you also have a look to this post : Lease Square Minimization, lsqnonlin (<http://www.mathworks.com/matlabcentral/answers/286006-lease-square-minimization-lsqnonlin>)