Performance analysis of a novel antenna array calibration approach for direction finding systems

Abstract

This paper addresses the problem of the direction of arrival (DoA) estimation in the presence of an uncalibrated array, i.e. when phase offset, carrier frequency offset and phase noise occur among the array signals. The method that we propose consists in the use of a particular antenna array that comprises the elements for the DoA estimation and a common antenna that is shared with a splitter among the receivers. The signal that impinges on the common antenna is acquired by every receiver and allows the estimation of the phase ambiguity. After the calibration step is performed, analogue switches select the array elements for the DoA estimation. A method that enables the phase ambiguity estimation is presented, and several simulated performance results are illustrated. Furthermore, we show the effect on calibration due to the presence of different carrier frequency offsets among the receivers and propose an approach for their compensation. The presence of phase noise is also considered and its effect is analysed.Copyright © 2012 John Wiley & Sons, Ltd.

Phase center motion based time modulated arrays with preprocessed time schemes for selective harmonic beamforming in B5G communication systems

“…• The proposed BFNs can be an efficient alternative to the transmit receive modules (TRMs) of the conventional phased arrays for enhancing the channel or beam diversities. 38 It can also be applicable for direction finding, 39 adaptive antenna arrays, 40 multi-input multi-output (MIMO) antenna array systems, 41 and femtocell applications. 42,43 The complete article is decorated as follows: The theoretical insights of time modulated linear arrays (TMLAs) are presented in Section 2.…”

“…Then, the switch‐ON times are optimized for unidirectional PCM to control the fundamental and scanned beam radiation patterns. For the scanned beam patterns, ultra‐low SLLs are targeted in the proposed work. Bidirectional PCM‐based switching scheme is employed for monopulse beam scanning. Non‐optimized as well as optimized switching sequences are designed and compared. As only one optimized time scheme is used to control both the fundamental and monopulse patterns, the BFN complexities are reduced in comparison to conventional arrays. The proposed BFNs can be an efficient alternative to the transmit receive modules (TRMs) of the conventional phased arrays for enhancing the channel or beam diversities 38 . It can also be applicable for direction finding, 39 adaptive antenna arrays, 40 multi‐input multi‐output (MIMO) antenna array systems, 41 and femtocell applications 42,43 …”