Mr. Jingbo Sai Profile

Jingbo Sai

at Beijing Univ of Technology

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Proceedings Article | 15 October 2021 Paper

Design of a single channel Doppler direction finding system

Jingbo Sai, Chenglong Yao, Ruirui Chen

Proceedings Volume 11933, 119332F (2021) https://doi.org/10.1117/12.2615152

KEYWORDS: Antennas, Switches, Doppler effect, Switching, Bandpass filters, Electronic filtering, Receivers, Control systems, Digital signal processing, Linear filtering

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This paper presents an improved ultrashort wave single-channel Doppler direction finding system. The circuit method of comparator + mid-band pass filter is proposed and analyzed to eliminate the influence of incoming wave amplitude modulation information on direction finding. An electronic switch switching frequency adaptive algorithm is proposed to eliminate the influence of the arrival frequency (phase) modulation information on the direction finding, that is, the method of using software to control the electronic switch switching frequency, programmable bandpass filter center frequency and bandwidth. When the switching frequency of the electronic switch is zero, the software calculates the appropriate switching frequency of the electronic switch and the narrowband bandwidth of the programmable bandpass filter based on the analysis of the arrival wave spectrum characteristics to give the horizontal angle of the arrival direction. This article gives an algorithm for the horizontal angle of the arrival direction.

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