Abstract
In recent years, the demand for small-scale remote sensing, which is used in disaster monitoring, agriculture, and ground subsidence has increased. A multichannel synthetic aperture radar (SAR) system can provide image and topographic information of the illuminated scene, regardless of adverse weather conditions. As a cost-effective solution to radar imaging, a multichannel W-band SAR system mounted on a multirotor unmanned aerial vehicle (UAV) is presented. The radar module was designed to operate at W-band to achieve small size and weight allowing the module to be mounted on multirotor UAVs with small payload. A detailed description of the design and measurement of the system is provided in this paper. The radar imaging capability of the developed system was verified by performing outdoor experiments using isolated buildings as targets. The multichannel functionality of the system was verified by measuring height of a point target placed above the ground. The measurements and experiments verified the feasibility of a multichannel radar mounted on a multirotor UAV for imaging and topographic applications.
Highlights
The applications of multirotor unmanned aerial vehicles (UAV) have increased in civil and industrial fields in the past few decades [1]
A survey on radars mounted on multirotor UAVs is provided in [11] along with an experimental result of multiple-input multiple-output (MIMO) imaging radar mounted on a hexacopter
In this paper multichannel synthetic aperture radar (SAR) system mounted on a multirotor UAV platform capable of real-time data transmission is presented
Summary
The applications of multirotor unmanned aerial vehicles (UAV) have increased in civil and industrial fields in the past few decades [1]. S. Kim et al.: Multichannel W-Band SAR System on a Multirotor UAV Platform With Real-Time Data Transmission Capabilities as an altimeter in [12], [13] to aid drone maneuverability and provide increased flight safety. While a conventional SAR measures the location of the target in a two-dimensional coordinate system, multiple SAR images can be coherently exploited to obtain additional information of the illuminated scene [20]. This technique is called SAR interferometry (InSAR) and is utilized for topographic mapping and motion mapping of the illuminated scene. In [30], a commercial low cost ultra wide band pulse radar was mounted on a multicopter drone to generate a SAR image of metallic objects.
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