Topic
Phased array
About: Phased array is a research topic. Over the lifetime, 19428 publications have been published within this topic receiving 229231 citations. The topic is also known as: Phased Array Radar, PAR.
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Papers
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12 Mar 2012TL;DR: This paper discusses the integration of array antennas in chip packages for highly integrated 60-GHz radios, and evaluates fixed-beam array antennas, showing that most of them suffer from feed network complexity and require sophisticated process techniques to achieve enhanced performance.
Abstract: This paper discusses the integration of array antennas in chip packages for highly integrated 60-GHz radios. First, we evaluate fixed-beam array antennas, showing that most of them suffer from feed network complexity and require sophisticated process techniques to achieve enhanced performance. We describe the grid array antenna and show that is a good choice for fixed-beam array antenna applications due to its easy feed network design and manufacture. Then, we examine switched-beam array antennas using the Rotman lens or Butter matrix, illustrating that they allow scanning only in one plane and some miss a link even in the boresight direction. Nevertheless, a switched-beam array antenna uses a conceptually simple switch circuit to select the best signal path and may be a cost-effective approach to implementing steerable antennas in the 60-GHz band. Finally, we describe adaptive beam or phased array antennas and highlight the challenges and practical realizations of phased array antennas in both ceramic and organic chip packages for single-chip 60-GHz radios.
63 citations
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02 Oct 1992TL;DR: In this paper, an annular array scanner utilizes a synthetic focusing approach to improve imaging results, including corrections for the speed of sound of the image, phased array misregistration and separate view misalignment.
Abstract: An annular array scanner utilizes a synthetic focusing approach to improve imaging results. Image sharpening methods include corrections for the speed of sound of the image, phased array misregistration and separate view misalignment as well as inverse filtering for the scanning system point spread function.
63 citations
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09 Aug 1994TL;DR: In this paper, the received signals near the splice between the near field and the far field, by dynamically steering the receive scan lines to reduce the effect of line warping, and by weighted averaging of adjacent scan lines.
Abstract: In a phased array ultrasound imaging system, a high quality image is obtained by a combination of line splicing and parallel receive beamforming. Two transmit pulses, one focused in the near field and one focused in the far field, are transmitted sequentially at each steering angle. The transmitted ultrasound energy is preferably focused both in azimuth and in elevation. Ultrasound echos are simultaneously received along two receive scan lines spaced angularly on opposite sides of each transmit scan line. Signals received in response to the near field and far field transmit pulses are spliced together to provide signals that represent a high quality image throughout the region of interest. Image artifacts are reduced by blending the received signals near the splice between the near field and the far field, by dynamically steering the receive scan lines to reduce the effect of line warping, and by weighted averaging of adjacent scan lines.
63 citations
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12 Jun 1990Abstract: A broad band multimode seeker system for a missile includes a wide band phased array transmitter/receiver unit incorporating a wafer scale phased array device with a bandwidth of about 2 GHz to 35 GHz. A multimode intermediate frequency unit selectively generates radar and jamming waveforms and measures parameters of reflected radar and external emissions of RF energy. A guidance processor manages the front end assets for selective active or semiactive radar searching and tracking, and simultaneous searching for, tracking of, homing on, and applying a selection of electronic countermeasures to, multiple defensive radars. Confirmation of an assigned target is made through correlation of received RF signals with libraries of expected defensive system parameters and high resolution target profiles and preloaded target geographical coordinates.
63 citations
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TL;DR: A scaleable configuration is presented for an aperture synthesis array operating in the frequency range from the ionospheric cut off at about 10 MHz to about 160 MHz where existing telescopes are confusion limited.
Abstract: The LOw Frequency ARray (LOFAR) is the Digital Software Radio Telescope that has been under study by the NFRA and the NRL for the last two years. A scaleable configuration is presented for an aperture synthesis array operating in the frequency range from the ionospheric cut off at about 10 MHz to about 160 MHz where existing telescopes are confusion limited. Both the array and the antenna station have a fractal structure following an exponential scaling law, which by appropriate weighting can provide a field of view and a synthesized resolution pattern of almost constant angular size independent of frequency. The processing architecture is scaleable as well and allows optimum distribution of the total processing power over signal and data processing tasks, by trading processed bandwidth in beam-formers and correlators for advanced processing like interference rejection, multi-beaming, pulsar processing, decade-wide chirp processing. The phased array antenna station provides a set of beams, which extends about a steradian on the sky and can be configured such that all relevant science objects are covered simultaneously. The pipelined self-calibration processing provides a clean image every third of a day, improving the sensitivity by a factor eight after two month of repeated observing. Based on the fast expansion of high performance processing technology, it is only after 2003 that signal and data processing will no longer dominate the cost of LOFAR in producing a confusion limited sky survey at sub mJy level.
63 citations