Open AccessTechnique to eliminate RF signal amplitude dependence in AOA measurement
Author(s) -
Chen H.,
Chan E.H.W.
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2019.3273
Subject(s) - signal (programming language) , radio frequency , amplitude , physics , angle of arrival , photodetector , rf power amplifier , optics , optical modulation amplitude , voltage , electrical engineering , optoelectronics , computer science , optical amplifier , engineering , amplifier , laser , cmos , antenna (radio) , programming language , quantum mechanics
A technique to estimate an incoming radio frequency (RF) signal angle of arrival (AOA) irrespective of the RF signal amplitude is presented. It is based on measuring the DC voltage at the output of two modules where each of them consists of an optical modulator, an optical filter and a photodetector. An RF signal amplitude‐independent AOA can be obtained from the ratio of the two DC voltages. Experimental results are presented that demonstrate 0°–63° AOA measurement with <3° errors for an RF signal with three different power levels of 3.2, −0.3 and −3.6 dBm into the modulator.