Open AccessDesign of direct wave cancellation system for high‐frequency CW radar
Author(s) -
Shang Nan,
Xin Ke,
Yu Changjun,
Wang Linwei
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2019.0274
Subject(s) - multipath propagation , single antenna interference cancellation , correctness , multipath interference , computer science , electronic engineering , continuous wave , radar , control theory (sociology) , acoustics , physics , telecommunications , algorithm , engineering , optics , control (management) , laser , channel (broadcasting) , artificial intelligence
When high‐frequency continuous wave (HFCW) radars transmit linear frequency modulated (LFM) continuous wave, there will be direct wave (DW) interference due to temporal continuity. In order to prevent receiver saturation, a DW cancellation system device is developed. This study studies the theoretical model of RF cancellation and derives the DW cancellation ratio formula. Afterwards, a system design scheme for DW cancellation is proposed, where the design and system control algorithms of each module of the cancellation system are mainly studied. Finally, by analysing the DW cancellation technique under multipath effect, it is found that the multipath effect will affect the depth of cancellation. The simulation results verify the correctness of the system design method, the measurement shows a leakage suppression of >15 dB under multipath effects.