2 research outputs found
UAV Placement for Real-time Video Acquisition: A Tradeoff between Resolution and Delay
Recently, UAVs endowed with high mobility, low cost, and remote control have
promoted the development of UAV-assisted real-time video/image acquisition
applications, which have a high demand for both transmission rate and image
resolution. However, in conventional vertical photography model, the UAV should
fly to the top of ground targets (GTs) to capture images, thus enlarge the
transmission delay. In this paper, we propose an oblique photography model,
which allows the UAV to capture images of GTs from a far distance while still
satisfying the predetermined resolution requirement. Based on the proposed
oblique photography model, we further study the UAV placement problem in the
cellular-connected UAV-assisted image acquisition system, which aims at
minimizing the data transmission delay under the condition of satisfying the
predetermined image resolution requirement. Firstly, the proposed scheme is
first formulated as an intractable non-convex optimization problem. Then, the
original problem is simplified to obtain a tractable suboptimal solution with
the help of the block coordinate descent and the successive convex
approximation techniques. Finally, the numerical results are presented to show
the effectiveness of the proposed scheme. The numerical results have shown that
the proposed scheme can largely save the transmission time as compared to the
conventional vertical photography model.Comment: submitted to ieee for possible publication. arXiv admin note: text
overlap with arXiv:2006.14438 by other author