Abstract: A transmitter includes an array antenna and a plurality of transmitter modules. Each transmitter module includes a phase-lock loop with a slipped-cycle counter for determining the number of cycles of slippage before locking. A source of frequency reference signals is coupled to the phase-lock loop of each module by a path of unknown length. The phase of the reference signals at each module is determined from the number of slipped cycles, and a phase or delay corrector is set to compensate for differences among the modules. The modules amplify the signals to be transmitted and apply the amplified signals to the antenna array by way of paths of controlled length.

Abstract: An open architecture design for a digital nearfield test system for nearfield testing of a phased array antenna allows the ability to use the components of an individual phased array antenna to be tested in conjunction with a nearfield scanner probe system allowing an efficient and cost-saving “radar testing the radar” scenario.

Abstract: A method of operating a multi-function phased array radar system having an antenna array populated with dual-pol antenna elements is described. The method includes selectively controlling individual dipoles of each dual-pol antenna element in order to operate the array in either a polarimetric mode with improved cross-pol isolation, or in a multi-mission mode, wherein a plurality of singularly-polarized signals are produced.

Abstract: A method of operating a multi-function phased array radar system having an antenna array populated with dual-pol antenna elements is described. The method includes selectively controlling individual dipoles of each dual-pol antenna element in order to operate the array in either a polarimetric mode with improved cross-pol isolation, or in a multi-mission mode, wherein a plurality of singularly-polarized signals are produced.