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Homodyne receiver architecture has been regarded as a promising solution to construct a low-cost, high-integration, power-efficient multi-function element-level digital phased array. However, one of the intrinsic drawbacks of homodyne architecture, namely in-phase and quadrature imbalance (I/Q imbalance) has not been fully addressed for the receiver arrays in previous articles, especially for broadband surveillance application dealing with multi-uncooperative signals. In this paper, a hybrid correction approach called random quadrature phase shift - adaptive compensation (RQPS-AC) is put forward to compensate consistent, random, and wideband I/Q imbalance for receiver arrays with arbitrary element number with only moderate computational resource requirement. Both the modified signal model and the two-stage correction structure are detailed. Following simulation results and comparison among existing algorithms demonstrate an optimal image rejection ratio (IRR) performance of our approach, with image signals successfully suppressing below the noise floor.
Inspec keywords: phased array radar; quadrature phase shift keying; compensation; antenna phased arrays; surveillance; radio receivers
Subjects: Other topics in statistics; Optimisation techniques; Radar equipment, systems and applications; Modulation and coding methods; Antenna arrays