EFFECTS OF GROUND ON ANTENNA MUTUAL IMPEDANCE FOR DOA ESTIMATION USING DIPOLE ARRAYS
This paper investigates the efiects on received mutual coupling of ‚=2 dipole arrays placed near real-earth. As a rule of thumb, estimation of mutual coupling can be divided in two regions of antenna height that is very near ground 0 < h < ‚ and fairly freespace region h ‚ ‚. The receiving antenna mutual coupling remains fairly unafiected from ground conductivity, when antenna height h ‚ ‚. Both vertical and horizontal polarization cases showed the same trend. Investigation of efiects of nearness of good-ground to the array on DOA estimation revealed that for azimuth DOA estimation, the proposed method of removing mutual coupling works well even for near ground.
Abstract : The purpose of this thesis is to evaluate the systems engineering effort by the Aviation Research and Development Activity (AVRADA), the Airborne Engineering Research Activity (AERA), and support contractor DOSS to install the Trimble Global Positioning System (GPS) receiver onto Army helicopter platforms. This study is an example of a successful systems engineering effort to install a non-developmental item (NDI) onto existing aircraft platforms in response to an urgent requirement created by the deployment of aircraft for Operation Desert Shield.