Abstract
Different from the phased-array using the same radiation frequency for each array element, frequency diverse array (FDA) uses a small frequency increment across its array elements to produce range, time and angle dependent transmit beampattern. Nevertheless, it is necessary to optimally design the frequency increments for the specific applications. In this paper, we propose a frequency increments design strategy by minimizing the Cramer-Rao lower bound (CRLB) for range and angle estimations of targets. The formulated CRLB minimization is a constrained optimization problem, which is solved by the genetic algorithm (GA). Numerical results show that, the proposed method achieves lower CRLBs for target localization and more focused transmit beampattern than existing FDA design strategies.
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