UAS-Based Antenna Pattern Measurements and Radar Characterization

This paper presents an update of the current in-situ antenna characterization and calibration of a radar system using an Unmanned Aircraft System (UAS) developed by the Advanced Radar Research Center (ARRC) at The University of Oklahoma. A large multirotor platform was customized for long endurance (~ 30 minutes), high positioning accuracy (< 3cm), and high stability, and was integrated with a high precision 3-axis gimbal that holds an antenna array and pulse generator-transmitter. The platform was designed to support measurements from 2 GHz to 10 GHz, however, the current setup described in this article includes an S-band array probe of 3×3 elements. The RF probe beamwidth was optimized to minimize reflections from the UAS frame and to provide accurate antenna measurements in flight conditions.

[1]  Jorge L. Salazar,et al.  A new approach for in-situ antenna characterization, radome inspection and radar calibration, using an Unmanned Aircraft System (UAS) , 2017, 2017 IEEE Radar Conference (RadarConf).

[2]  T. Foerster,et al.  HIGH-PRECISION POSITIONING AND REAL-TIME DATA PROCESSING OF UAV-SYSTEMS , 2012 .

[3]  R. Tascone,et al.  Recent results in antenna pattern measurement with UAVs , 2015, 2015 International Conference on Electromagnetics in Advanced Applications (ICEAA).

[4]  K. L. Beeke,et al.  HF antenna radiation patterns over real terrain , 1988 .

[5]  Nafati A. Aboserwal,et al.  A dual-polarized cross-stacked patch antenna with wide-angle and low cross-polarization for fully digital multifunction phased array radars , 2016, 2016 IEEE International Symposium on Phased Array Systems and Technology (PAST).

[6]  Jorge L. Salazar,et al.  Edge diffractions impact on the cross polarization performance of active phased array antennas , 2016, 2016 IEEE International Symposium on Phased Array Systems and Technology (PAST).

[7]  Marco Piras,et al.  UAV-based radiation pattern verification for a small low-frequency array , 2014, 2014 IEEE Antennas and Propagation Society International Symposium (APSURSI).

[8]  Jorge L. Salazar,et al.  A novel near-field robotic scanner for surface, RF and thermal characterization of millimeter-wave active phased array antenna , 2016, 2016 IEEE International Symposium on Phased Array Systems and Technology (PAST).

[9]  Jorge L. Salazar,et al.  Source Current Polarization Impact on the Cross-Polarization Definition of Practical Antenna Elements: Theory and Applications , 2018, IEEE Transactions on Antennas and Propagation.

[10]  John Y. N. Cho,et al.  The Next-Generation Multimission U.S. Surveillance Radar Network , 2007 .

[11]  Fatih Ustuner,et al.  Antenna radiation pattern measurement using an unmanned aerial vehicle (UAV) , 2014, 2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS).

[12]  Dusan Zrnic,et al.  Polarimetrie phased array calibration for large-scale multi-mission radar applications , 2018, 2018 IEEE Radar Conference (RadarConf18).

[13]  Earle R. Williams,et al.  End-to-end Calibration of NEXRAD Differential Reflectivity with Metal Spheres , 2013 .

[14]  Marco Piras,et al.  Antenna Pattern Verification System Based on a Micro Unmanned Aerial Vehicle (UAV) , 2014, IEEE Antennas and Wireless Propagation Letters.