Parasitic Doppler effect in passive location

Large base interferometry is a fast and accurate technique for passive emitter location. Experiments both in direct and inverse configuration have been executed and in this paper some results are presented in which the main sources of errors in Doppler measurements are analyzed. The observer attitude measurements need high accuracy, because it can lead to large estimation errors. Vibrations can be a problem in case of wings mounted antennas. The Doppler induced by the scanning antenna phase center displacement has been analysed as a possible source of error also in the inverse configuration where much of the disturbances are eliminated.