Patent ID: 6618008
Filing Date: 2003-09-09
Classification: G01S

Abstract:
A monopulse phased array system comprising antenna elements, each of which is connected to a corresponding transmitter/receiver (T/R) module operating under control of a beam steering computer (BSC), wherein each T/R module receives a transmission signal for forming a transmitting beam, and wherein a set of three signals including a sum signal, an azimuth difference signal, and an elevation difference signal, are derivable for each antenna element from reflection signals corresponding to reflections of the transmitting beam, wherein an least one combination unit derives, for each of the set of three signals derivable for each antenna element, a total sum signal, a total elevation angle difference signal and a total azimuth angle difference signal, from which regulation signals for are obtained for resteering the transmitting beam generated under the control of the beam steering computer, and wherein the monopulse phased array system further comprises:an antenna arrangement space wherein the antenna elements are arranged into quadrants defined relative to a main axis of the transmitting beam, and wherein axes defined for determining the elevation and azimuth angle difference signal are perpendicular to the main axis of the transmitting beam, wherein each of the T/R modules includes a 180Â° phase shifter, for determining the elevation angle difference signal and for determining the azimuth angle difference signal, and wherein when the transmitting beam after rotation has been directed at a target, the T/R modules are controllable such that, for each antenna element, a phase of shift of 180Â° is executed in the elevation difference signal and the azimuth angle difference signal in the T/R modules of the antenna elements located in sectors whose sign of the axis direction perpendicular to the axis direction of the transmitting beam has changed through the rotation.