1. A method, comprising: generating a range-Doppler correlation grid for each of multiple navigation signals, wherein energy peaks of the range-Doppler correlation grids represent range-Doppler hypotheses corresponding to the navigation signals; identifying range-Doppler hypotheses from j of the range-Doppler correlation grids for which corresponding energy levels meet a first threshold, wherein j is a positive integer; computing a navigation solution from each of multiple sets of the identified range-Doppler hypotheses, wherein each set includes one identified range-Doppler hypothesis from each of a plurality of the j range-Doppler correlation grids; evaluating the navigation solutions to identify one or more of the navigation solutions as plausible navigation solutions; and selecting a most plausible navigation solution when multiple plausible navigation solutions are identified; wherein the generating, the identifying, the computing, the evaluating, and the selecting are performed in a suitably programmed computer system.