In order to realize the desired characteristics of such an array antenna, a certain minimum number of elements, which are usually arranged in a mutual distance of approximately half a wavelength, is required. Of course, the dimensions of this array are larger than those of navigation antennas, which consist only of a single element. A square 3x3 array, to be used in the Galileo E1 band (1.575 GHz, free-space wavelength approx. 19 cm), has already a side length of approx. 30 cm. A problem associated with the decrease of the element distance is the increasing coupling. By the use of new concepts and the employment of suitable networks these difficulties can be removed and the dimensions significantly reduced.
By now, the size of the antenna is often impeding its employment. A small, compact array offers extended possibilities for the mounting on mobile platforms, and both functional and aesthetic frame conditions can be fulfilled more easily. Antennas, which are conformal and e.g. integrated in the surface of aerodynamically optimized carrier structures, can be realized with significantly reduced expenditure and less modification of the carrier. Moreover, optimal solutions can be offered for different platforms and interference scenarios.
In the framework of KOMPASSION a receiving system for navigation signals will be developed to demonstrate concepts, technologies and applicability of algorithms for digital beamforming and interference mitigation.
2010 - 2013