Mm wavelengths complex Doppler analysis using dark field illumination

Christensen, J.K.; Underhill, M.J.

doi:10.1109/maes.2005.1499248

Cited by 1 publication

(2 citation statements)

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“…Naturally, this gave us an immediate opportunity to monitor and control the rotation rate, as well. The work described in [6] was performed with a rather complicated lathe chuck and shaft construction, causing some size problems to overcome, and possibly anyhow not giving the desired rotational stability. No data were available about the position-measuring features in that study.…”

Section: Methodsmentioning

confidence: 99%

“…The motivation was (and is) partly in our need for an autonomous Doppler evaluation target for millimeterwave radar work out in the field. The motivation was also partly in the recent series of interesting articles [4][5][6][7] where a quasimonostatic radar was used to experimentally study the frequencydomain behavior of radar returns from rotating long conducting cylinders. In particular, if possible we wanted to extend the audiofrequency range beyond values shown in [5] and, at the same time, to have a look at "flat," more disk-like targets.…”

Section: Introductionmentioning

confidence: 99%

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The Doppler wheel revisited

Eskelinen

Ruoskanen

2008

IEEE Antennas Propag. Mag.

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Millimeter-wave radar returns from cylindrical targets, such as artillery shells or helicopter rotor shafts, can be experimentally evaluated with the classic Doppler wheel. This also is a simple autonomous calibration tool for radar development and field testing. However, the less-apparent wheel-return characteristics found in practice must be taken into account. Doppler spectra for speeds up to 3000 rpm measured with a Ka-band radar against a 100 mm-diameter flat cylinder are presented, showing a frequency range from 200 to 4200 Hz. Meaningful signal amplitudes were measured up to the rim-speed Doppler. Frequency components beyond the range defined by the local radial velocity of the illuminated portion were observed up to 2500 Hz. Miniature surface deformations increased the amplitude of the highest frequencies by 5-10 dB3. Simulated spectra agreed with measurement results at the higher Doppler frequencies, but a model based on Physical and Geometrical Optics failed to explain the low-frequency components.

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Section: Methodsmentioning

confidence: 99%