Abstract: To make small UAVs capable of geolocation of emitters, a low cost, low power, small weight and power radio receiver receives and tracks Doppler frequency at a minimum. In order to minimize the size, weight and power (SWAP), a single receiving element array is utilized. The analysis of geolocation performance with single and multiple UAV receiving platforms is considered. With a single UAV platform measuring Doppler frequency with unknown center frequency, a localization accuracy on the order of ten to 100 meters is possible within a couple of minutes, or about one to five percent of the target range.