Abstract
To obtain the spin speed of projectile effectively, a micro-Doppler modulation model of rotating projectile measured by continuous-wave radar (CW radar) is introduced. High spin speed of projectile brings micro-Doppler modulation on echoes of CW radar, and there are many micro-Doppler modulation harmonic waves in the zero intermediate frequency (ZIF) echoes. The frequency interval of the adjacent harmonic waves is several times of rotational frequency, but the integral multiple is unknown. The simulation results prove correctness of the proposed mathematic model.
Highlights
The spin speed is a key test parameter of motive projectile and directly related to the design of various projectiles, guidance devices and fuses etc
In order to measure spin speed with unbroken projectile, a method based on digital demodulation is proposed by extracting the micro-Doppler signal in the echo of CW radar, which is the first application of micro-Doppler technology on unbroken projectile [4]
An emendatory micro-Doppler modulation of rotating projectile on CW radar echoes is proposed, which explains the reason of spin speed ambiguous
Summary
The spin speed is a key test parameter of motive projectile and directly related to the design of various projectiles, guidance devices and fuses etc. High speed spin of projectile bring modulation on echoes of CW radar, and there are many harmonic waves around Doppler signal, which called micro-Doppler effect [2]. This method can measure the spin speed of projectile along with time, but it changes the structure of projectile as the telemetry method. In order to measure spin speed with unbroken projectile, a method based on digital demodulation is proposed by extracting the micro-Doppler signal in the echo of CW radar, which is the first application of micro-Doppler technology on unbroken projectile [4]. The method proposed in References 4 is incomplete, and the extracted spin speed is ambiguous. An emendatory micro-Doppler modulation of rotating projectile on CW radar echoes is proposed, which explains the reason of spin speed ambiguous
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