Correlative interferometer is a type of radio direction finding (RDF) system that finds the angle of arrival of a signal through the correlation between the phase difference of the sample data and incident signal. To reduce the multipath issues of the RDF system based on correlation and baseline setup, a multiple baseline configuration of four sensors is proposed in this paper. In this proposed system, four sensors were properly spaced to minimized losses and establish a line of sight (LOS). Using the 2-dimensional approach the angle of arrival (AOA) of the signals received at various sensors is determined using the intersection of the hyperbolas produced by the receiving sensors and this corresponds to the true location of the emitter. Moreover, the phase differences of the received signal to the antenna array elements are computed and correlated with the values in the lookup table for the estimation of the AOA. The accuracy of estimation was found to be affected by the Geometry of the Sensor Units (GDOP), computational errors during the execution. Thus, this paper shows a method of minimizing multipath signal reception and noticed that the accuracy of the estimation could be enhanced if the geometry of the sensor units and computational errors were properly deliberated.
Key words: Emitter location, Least Square, Triangulation, Correlative Interferometry, Location estimation, Angle of Arrival