Passive Monopulse Amplitude-comparison Three-dimensional Direction-finding Based on Six-element Antenna Array

This paper proposes the passive monopulse amplitude-comparison three-dimensional direction-finding method based on six-element antenna array, which can estimate the azimuth and elevation angles of the arrived signal simultaneously in electronic warfare system. Firstly, the sum-difference lookup table of the array’s differential gain is constituted; Secondly, the quadrant of three-dimensional space is determined by the maximum three amplitudes in the array; Lastly, the azimuth and elevation angles of the arrived signal are estimated by the sub-regional search algorithm. Instead of directly large scope azimuth-elevation search with intensive computation, the algorithm locates the azimuth-elevation region by only two simple one-dimensional searches, and then finds the optimum value in the small azimuth-elevation region, so as to decrease the computation burden. Eventually, the simulation is made to evaluate the accuracy of azimuth and elevation estimation.