Theoretical and Experimental Analysis of Radar Micro-Doppler Signature Modulated by Rotating Blades of Drones

Radar signatures contributed by rotating blades of drones usually refer to the kinematical micro-Doppler phenomenon on spectrograms. Here, theoretical analysis indicates that when sampling time is short enough that this signature becomes instant micro-Doppler signatures with scattering characteristi...

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Bibliographic Details
Published inIEEE antennas and wireless propagation letters Vol. 19; no. 10; pp. 1659 - 1663
Main Authors Gong, Jiangkun, Yan, Jun, Li, Deren, Chen, Ruizhi, Tian, Fengyi, Yan, Zhen
Format Journal Article
LanguageEnglish
Published New York IEEE 01.10.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Airborne radar
Anechoic chambers
Blade flash
Blades
Doppler effect
drone detection
Drones
dynamic measurement
High speed cameras
high-resolution range profile (HRRP)
instant micro-Doppler
Mapping
Modulation
Network analysers
Radar cross-sections
Radar signatures
Radar tracking
rotating blades
Rotation
rotor blade modulation (RBM) feature
Rotor blades
Scattering
scattering characteristic
Spectrograms
Superhigh frequencies
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Summary:Radar signatures contributed by rotating blades of drones usually refer to the kinematical micro-Doppler phenomenon on spectrograms. Here, theoretical analysis indicates that when sampling time is short enough that this signature becomes instant micro-Doppler signatures with scattering characteristics, appearing as "blade flash" in the time domain and rotor blade modulation (RBM) feature in the spectrum. In an anechoic chamber, we track this instant micro-Doppler signature by using a dynamic measurement system composed of a network analyzer and a high-speed camera to collect high-resolution range profile of a consumer drone, DJI Phantom 3 Vision within S-band, X-band, and Ku-band. The experimental results demonstrate that rotating blades do cause signal fluctuation of "blade flash" and register the RBM feature in the spectrum, and the modulation effects are weak within S-band, strong within X-band, and stronger within Ku-band. This instant micro-Doppler with scattering characteristic establishes a mapping between radar signature and the rotation structure component of the drone and enables us to distinguish a drone from other nonblades objects in the air, especially with little radar observation time.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2020.3013012