Abstract
An Improved Antenna Group Delay Measurement Method Using a Three-antenna Extrapolation Technique
Highlights
Antenna is an essential part of a transmitting or receiving system that is designed to radiate or to receive electromagnetic waves [1]
The group delay of the antenna versus aspect angle is defined in the standard of Radio Technical Commission for Aeronautics (RTCA), and its limit is specified from 0.65 ns to 2.5 ns related to the elevation angle at GPS L1 frequency (1575.42 MHz) which shows the requirements for high accuracy antenna GD measurement [16]
A curve fitted according to (16) and GDcN is shown in this figure and its expression is CFitted = (A1/d)cos(2kd) + A2, where A1 and A2 are frequency-dependent fitting coefficients
Summary
Antenna is an essential part of a transmitting or receiving system that is designed to radiate or to receive electromagnetic waves [1]. Antenna performance is characterized by various parameters which can be obtained through measurements [2], [3]. Antenna measurements always aimed at gain, pattern, efficiency and some other main parameters [4,5,6,7,8,9,10]. With the development of satellite navigation, remote sensing, modern communication, et al, antenna group delay (GD) is paid more and more attentions nowadays. For global navigation satellite systems (GNSS), antenna GD measurement accuracy will set the boundaries of how well it will perform [11,12,13,14,15]. The group delay of the antenna versus aspect angle is defined in the standard of Radio Technical Commission for Aeronautics (RTCA), and its limit is specified from 0.65 ns to 2.5 ns related to the elevation angle at GPS L1 frequency (1575.42 MHz) which shows the requirements for high accuracy antenna GD measurement [16]
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