1. A method for determining the location of an emitter, comprising: selecting a first subset of a plurality of parameters comprising a signal model associated with the emitter; estimating values for the selected first subset of the plurality of parameters from a plurality of time of arrival measurements associated with the emitter and the signal model; and generating estimated values for the plurality of parameters according to the estimated values for the selected first subset of the plurality of parameters, a plurality of time of arrival measurements, and the signal model.