Patent ID: 7468706
Filing Date: 2008-12-23
Classification: G01S,H01Q

Abstract:
1. An antenna system for measuring azimuth and elevation angles of an active, signal sending radiosonde, the antenna system comprising: a first passive antenna group comprising at least two antenna arrays, having a direction pattern that is wide at least in an elevation plane, the first passive antenna group being adapted to measure the azimuth angle of the radiosonde based on phase differences between the antenna arrays, and based on a direction of an antenna field, a second passive antenna group comprising at least two antenna arrays ( the second passive antenna group being adapted to measure the elevation angle of the radiosonde based on phase differences between the antenna arrays, and at least one third antenna element having high gain adapted to receive a telemetry signal, a direction pattern of the at least one third antenna element being narrow in an azimuth plane and wide in the elevation plane, wherein wherein each one of the at least two antenna arrays of the first passive antenna group is disposed directly facing each of right and left lateral sides of one of the at least two antenna arrays of the second passive antenna group.