Radiation Pattern Measurement for Earth Station Antenna Based on UAV
Antenna pattern is an important performance parameter of antennas, which reflects the basic performance indexes and working condition. Antenna pattern measurement with high precision can be implemented by the anechoic chamber, but the environment of the a
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Abstract Antenna pattern is an important performance parameter of antennas, which reflects the basic performance indexes and working condition. Antenna pattern measurement with high precision can be implemented by the anechoic chamber, but the environment of the anechoic chamber is not suitable for the large size ground station antenna. Given the impact of surrounding environment, it is necessary to measure the fixed antenna in open field. Since the antenna is fixed, the traditional on-site measurement schemes do not have high precision. As for the fixed ground station antenna, a solution is proposed to realize the high precision measurement by Unmanned Aerial Vehicle (UAV). UAV can flies along the orbit flexibly and conveniently to measure patterns in any plane. In order to reduce the influence of the positioning accuracy and flight leeway, the following improvements are implemented: (1) while the UAV flies, Real Time Kinematic (RTK) positioning based on Time Difference Of Arrival (TDOA) is applied to realize precise positioning; (2) Curve fitting method is used to decrease the angle deviation brought by flight leeway. The proposed method is verified by simulation. The simulation results show that the amplitude error, caused by positioning error and flight leeway, is reduced to 0.21 dB. The pointing angle deviation is 0.1°. Keywords Antenna patterns
Measurement Position Curve fitting
Z. Wang (&) C. Qiao College of Mechatronics Engineering and Automation, National University of Defense Technology, NUDT, Changsha, China e-mail: [email protected] C. Qiao e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2017 J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2017 Proceedings: Volume I, Lecture Notes in Electrical Engineering 437, DOI 10.1007/978-981-10-4588-2_53
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1 Introduction Antenna pattern is an important performance parameter of the antenna, which reflects the basic performance indexes and working condition. High precision measurement of antenna pattern can be implemented in the anechoic chamber, but the environment of the anechoic chamber is not suitable for the large size ground station antenna. Given the impact of surrounding environment, it is necessary to measure the fixed antenna in open field. Reference [2] shows that the earth station antenna can be measured by using calibration tower, radio star or synchronous satellite, But these methods are aimed at the rotatable antenna. When the antenna is fixed, only the auxiliary antenna can be used to realize the measurement. For fixed earth station antenna, therefore, the way to ensure a flexible and convenient measurement to improve the measurement accuracy is significant. The earth station antenna measurement can be implemented by satellites, radio star or aircraft carrying signal source that turns around the tested antenna [3–7]. In the reference [3], satellite is used to measure the earth station antenna pattern. Trajectories of the satellite or radio star is accurate, so the measuring precision
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