Abstract: Method and system for synthetic aperture radiometry not limited by the Van Cittert-Zernike theorem and the quasi-monochromatic assumption. A radiometer system (300) for imaging the emissions from a distribution of incoherent emission sources located within a target area comprising a first antenna (322) configured to receive a first signal (326) emitted primarily from a target area, and a second antenna (324) configured to receive a second signal (327) emitted primarily from the target area. The first and second antennas may be located at approximately the same distance from the target area (310) or at substantially different distances from the target area (310). The radiometer system (300) is configured to allow the second antenna (324) to move faster than the first antenna (322) with respect to the target area (310), with the second antenna (324) moving along a pre-determined trajectory corresponding to a synthetic aperture (430).

Abstract: An apparatus for implementing true time delay digital beamformers for forming transmit and/or receive beams in array antennas. The apparatus includes a mixed signal application-specific integrated circuit (ASIC), which is comprised of an analog-to-digital converter (A/D) as an input circuit, an internal digital delay circuit, and a digital-to-analog converter (D/A) as an output circuit. The internal digital delay circuit provides true time delays that are selectable based on digital control, whereas the A/D and D/A circuits provide the interface circuits for the analog input and output signals. Formation of receive beams are accomplished by a plurality of mixed signal ASICs, low pass filters and analog combiners, where these components are connected in a configuration to combine a plurality of low pass filtered and time delayed analog signals located at the outputs of a plurality of mixed signal ASICs.

Abstract: The present invention is a system and method for radar detection of moving targets. The radar system of the present invention has only a single transmit phase center and a single receive phase center. The method of the present invention includes radiating a set of pulses to illuminate a desired scene. The pulses are reflected off of a target and a set of return signals are received. The pulse returns are then digitized, resulting in a set of data returns. Motion compensation is then performed on the entire set of data returns. A plurality of blocks of the motion compensated data are selected that are highly overlapping in time. A plurality of images is then generated from the plurality of blocks of motion compensated data. A consecutive set of the plurality of images is then selected. Lastly, moving objects represented within the consecutive set of images are identified.

Abstract: Method and system for synthetic aperture radiometry not limited by the Van Cittert-Zernike theorem and the quasi-monochromatic assumption. A radiometer system (300) for imaging the emissions from a distribution of incoherent emission sources located within a target area comprising a first antenna (322) configured to receive a first signal (326) emitted primarily from a target area, and a second antenna (324) configured to receive a second signal (327) emitted primarily from the target area. The first and second antennas may be located at approximately the same distance from the target area (310) or at substantially different distances from the target area (310). The radiometer system (300) is configured to allow the second antenna (324) to move faster than the first antenna (322) with respect to the target area (310), with the second antenna (324) moving along a pre-determined trajectory corresponding to a synthetic aperture (430).

Abstract: An antenna receiving system having an array of dual sense antenna elements for receiving both right hand and left hand circular polarized radiation from each of one or more targets, a right hand and a left hand polarized radiation attenuator and a right hand and a left hand polarized radiation phase shifter connected to each antenna element, a direction finding computer for controlling the attenuators and phase shifters connected to each antenna element and for processing outputs from selected pairs of phase shifters in order to find a direction to each of the one or more targets, and a beam forming computer for control the attenuators and phase shifters in order to select a cluster of antenna elements for each of one or more targets, each cluster for receiving data from a target.

Abstract: An apparatus for implementing true time delay digital beamformers for forming transmit and/or receive beams in array antennas. The apparatus includes a mixed signal application-specific integrated circuit (ASIC), which is comprised of an analog-to-digital converter (A/D) as an input circuit, an internal digital delay circuit, and a digital-to-analog converter (D/A) as an output circuit. The internal digital delay circuit provides true time delays that are selectable based on digital control, whereas the A/D and D/A circuits provide the interface circuits for the analog input and output signals. Formation of receive beams are accomplished by a plurality of mixed signal ASICs, low pass filters and analog combiners, where these components are connected in a configuration to combine a plurality of low pass filtered and time delayed analog signals located at the outputs of a plurality of mixed signal ASICs.