We present methods for accurately estimating and tracking instantaneous frequency and relative time delay of
narrowband signal components. These methods are applied to the problem of estimating the location of an
emitter from the signal(s) received by one or more receivers. Both instantaneous frequency estimation and time
delay estimation are based on previously reported cross-spectral methods that have been applied successfully
to a variety of signal processing problems. Accurate geolocation is accomplished by matching the Doppler
characteristics of the received signal to Doppler characteristics estimated from the known emitter motion and
possible emitter locations.