Coordinated Movable Antennas Assisted Covert ISAC for Low-altitude Systems

This paper proposes a novel coordinated movable antennas (MA)-assisted covert integrated sensing and communication (ISAC) strategy for low-altitude systems, where the transmitter not only emits ISAC signals, but also generates artificial noise (AN) to increase the uncertainty of the warden's detection and enhance the sensing performance. We aim to maximize the sensing signal-to-clutter-plus-noise ratio (SCNR) by jointly optimizing the covariance matrix of the transmit signal/AN, positions of transmit/receive MA, and the receive filter. To solve the highly coupled nonconvex problem efficiently, a Dinkelbach-block successive upper-bound minimization (BSUM) algorithm is developed, which guarantees tractable block-wise updates and monotonic convergence. Simulation results verify the effectiveness of the proposed strategy, showing that coordinated MA arrays achieve an up to 3.6 dB sensing SCNR gain over the conventional fixed-position antenna scheme.