Results 131 to 140 of about 777 (161)

Fast response Retrodirective Radar

2010 IEEE MTT-S International Microwave Symposium, 2010
This paper shows the ability of an all analogue Retrodirective Radar, the first of its type, to provide continuous surveillance and near instantaneous target acquisition while automatically beam steering in real time onto a target which is presented to it.
N. B. Buchanan, V. Fusco, P. Sundaralingam   +2 more
openaire   +1 more source

5.8 GHz full duplex amplitude shift keying retrodirective interrogator array

Microwave and Optical Technology Letters, 2013
This article describes a practical demonstration of a complete full-duplex “amplitude shift keying (ASK)” retrodirective radio frequency identification (RFID) transceiver array.The interrogator incorporates a “retrodirective array (RDA)” with a dual ...
Chan, Pak, Fusco, Vincent; id_orcid
exaly   +2 more sources

Retrodirective airborne radar for urban surveillance

2008 42nd Asilomar Conference on Signals, Systems and Computers, 2008
Urban surveillance with airborne radar systems is very challenging due to blockage of line-of-sight caused by buildings. To overcome this limitation, it is very likely that the radar will be mounted on a small, inexpensive unmanned aerial vehicle (UAV) that can fly directly over an urban area of interest. Unfortunately, such systems provide very little
openaire   +2 more sources

Redirective and retrodirective antenna arrays

IEEE Transactions on Antennas and Propagation, 1969
The problem considered is the redirection of a time-varying signal from one specified point to another by a set of arbitrarily spaced antenna array elements. The necessary and sufficient condition for signal redirection is determined without restricting the analysis to a monochromatic signal.
E. Putzer, R. Ghose
openaire   +1 more source

A Sparsely Designed Retrodirective Transponder

IEEE Antennas and Wireless Propagation Letters, 2006
Retrodirective arrays have shown great potential for use as wireless transponders due to their automatic source tracking ability. A retrodirective transponder based on a sparse array is presented. The architecture uses a sparse array design to reduce the amount of elements, and thus circuitry required.
D. S. Goshi, K. M. K. H. Leong, T. Itoh
openaire   +1 more source

A study of retrodirective array performance in the presence of multipath

Proceedings. Second Annual Conference on Communication Networks and Services Research, 2004., 2004
The paper attempts to analyze the performance of a heterodyne phase conjugate retrodirective transceiver for full duplex communications in the presence of multipath signals and amplitude and phase perturbations across a four element antenna array. Simulation results are given and it is shown that the retrodirective array improves multipath fading in a ...
Chris Loadman, Zhizhang Chen
openaire   +1 more source

Retrodirective Radar Calibration Nanosatellite

2013
Abstract : For more than eight years, the DMSP F-15 and RADCAL satellites have been operating past their operational lifetimes and are facing imminent failure, leaving the US military without a reliable means for C-Band radar calibration and performance monitoring.
Nicholas G. Fisher, Larry K. Martin, Wayne A. Shiroma   +2 more
openaire   +1 more source

Noise-correlating radar based on retrodirective antennas

IEEE Transactions on Aerospace and Electronic Systems, 2007
A new retrodirective antenna-based search radar system has been introduced. The suggested system uses a noise correlation technique to detect the presence and the direction of the target. Simulation and analytical results show an order of magnitude improvement in acquisition time of the radar when compared with a phased array antenna-based radar system
Woolard, Dwight, Zhang, Weidong, Gelmont, Boris, Brown, Elliott R., Trew, Robert   +4 more
openaire   +1 more source

Development of a retrodirective PARC for ALOS/PALSAR calibration

IEEE International Geoscience and Remote Sensing Symposium, 2003
A novel PARC of Van Atta array design is developed for polarimetric calibration of PALSAR onboard the ALOS satellite. The PARC consists of four dual-polaraized 3/spl times/3-cross-dipole subarrays. The Van Atta array configuration combining with dual-polarized nature of the subarrays provides the PARC the depolarizing and retrodirective characteristics
openaire   +3 more sources

Circularly symmetric retrodirective antenna system

1971 Antennas and Propagation Society International Symposium, 1971
A method is described by which automatically retrodirective performance may be obtained from circular arrays and circularly continuous aperture antennas. The method is also directly applicable to cylindrical antennas for two-dimensional retrodirectivity and is generalized to include a method for obtaining three-dimensional retrodirectivity.
openaire   +1 more source