Passive location method and accuracy analysis with phase difference rate measurements

The interferometer is the traditional instrument used to find the direction of an emitter by measuring the phase difference of arrival of its RF emissions. Bearings-only motion analysis indicates that an observer with these direction measurements can locate the position of the emitter in a period of time. A novel passive location method is introduced with phase difference and phase difference rate measurements with the interferometer mounted on a moving observer. The accuracy of a passive location system with these measurements is analysed. The results show a significantly improved performance compared with the traditional method.