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We present an iterative method for joint antenna-array calibration and direction of arrival estimation using millimeter-wave (mm-Wave) radar operating at 77 GHz. The calibration compensates for antennaarray coupling, and phase and gain errors, and does not require any training data. This method is well suited for applications, such as automotive radars, where multiple antenna elements are packaged...
This letter introduces an antenna array calibration method that uses the channel response with known subject direction so as to accurately estimate living-body directions in multipath environments for elderly monitoring. Said calibration is extracted from the known living-body direction information using the Fourier transformed channel matrix. An experiment shows that the proposed method offers successful...
In this paper, we propose a novel distortion calibration algorithm for uniform circular array (UCA) based on its special structure. A near-field calibration antenna, located in the center of circular array, is used to estimate the gain and phase uncertainties of elements. Besides, a single far-field source is used to estimate the direction-of-arrival (DoA) and mutual coupling matrix (MCM). Finally,...
This paper presents our design of a frequency agile beamforming array over a very broad frequency range (2GHz–18GHz). We chose to use an 8 thin wire half-wave (at 5.8GHz) dipole circular array as our antenna array. The array radius is 1.0″. Simulation and lab test results for transmitting beamforming are presented to demonstrate the capability of the array system.
Generally GPR transmits and receives radio waves with a single polarization using two parallel antennas. But it is possible to improve the GPR ability of discrimination and imaging of subsurface targets by analyzing the backscattered wave with a variety of polarizations. So we are developing a full-polarimetric GPR system, including PC, network analyzer, rectangular coordinates robot, switch driver,...
This paper proposes an array antenna calibration method for array antenna systems. The proposed method calibrates the amplitude and the phase of RF systems using internal coupler and switches without aids of external calibration systems. Computer simulation demonstrates that the proposed method corrects beamforming angles.
Conventionally, to multi-dimensional spectral estimation techniques, each data snapshot in space is captured simultaneously in time. The size of the antenna array is dependent on the area of interest. In this paper, we propose a data measurement technique, which does not collect data samples within each snapshot in space simultaneously but sequentially along a predefined path, and a spectral estimation...
A feed for a compact antenna test range operating in P-band in single polarization has been manufactured and tested in the SATIMO SG-64 multiprobe spherical near field test range in Paris. The feed consist of an array of 4 high gain log-periodic elements. This paper briefly describes the consideration on antenna design and manufacturing and report on the final testing including considerations on the...
Aperture synthesis technique is a feasible means to provide high spatial resolution at low frequencies. But due to the impacts of system errors, time varying scenes, and different inversion algorithms, analytic studies of system performances are difficult or impossible, and the need of numerical simulation appears. In this paper, a signal-level simulator is presented. It covers brightness temperature...
Coherent arraying of transmitting antenna signals at a distant spacecraft provides an effective gain proportional to N2, where N is the number of antennas in the array. This technology is currently being developed for NASA's Deep Space Network (DSN) to provide greater range and data throughput for future NASA missions, including manned missions to Mars and exploratory missions to the outer planets,...
This paper presents the concept and design of a highly integrated KA-band frontend module. In detail, the integration and packaging techniques, which combine the antenna, the RF circuitry and the cooling system within one functional block are discussed. It will be shown that these system concepts can be applied for large antenna arrays as needed to fulfil link budget requirements for the intended...
A self-calibration algorithm for Y-shaped array (SAY) is presented in the presence of mutual coupling. It utilizes special mutual coupling characteristics of Y-shaped array to decouple the azimuth (AZ)/elevation (EL) and mutual coupling coefficients of antenna array so that two kinds of parameter estimations can be realized without any calibration sources. Different from conventional self-calibration...
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