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The reader generates an interrogation tone which is backscattered by the tag.
On the contrary, in the presence of only one interrogation tone, the distance would have been estimated directly from the phase of the sinusoid in (23) from which d is obtained with an ambiguity of (d_{text {max}}=frac {c}{4 f_{1}} approx 9, cm, which is obviously too small for any practical application of the system.
Similar(58)
Note that the adoption of two interrogation tones allows the operation in (25) and (26) from which, due to the periodicity of 2π of the phase estimate, no ambiguities in ranging arise for distances less than (d_{text {max}}=frac {c}{4 Delta f}).
When I treated the interview more as a conversation with a purpose than as a sterile interrogation, the tone of the exchange softened.
But better than the interrogation is the tone, which is placid and certain.
After David Cameron's appearance on Question Time last night, one sketchwriter spoke for the most deranged of his colleagues when he couched his description of the interrogation in a tone of antic glee.
In this paper, we investigated, from the theoretical point of view, the detection and ranging capabilities of harmonic tags by proposing a simple two-tone interrogation signal and a dedicated receiver scheme.
To overcome the typical ambiguity problem arising when estimating the distance through phase measurements at microwave frequencies, a simple two-tone interrogation signal is proposed providing a robust detection and accurate distance estimation (ranging) through a proper combination of the signals received at harmonic frequencies.
A two-tone interrogation signal and a dedicated signal processing scheme at the receiver are proposed to eliminate phase ambiguities caused by the short signal wavelength and to provide accurate distance/position estimation even in the presence of clutter and multipath.
In this case, the only marker signalling interrogation is intonation: the tone must be raised at the end of the sentence.
The first sentence of your column tells the tale: "... Bush administration's torture policy.... ...... Rather than calling the policy enhanced interrogation, your supposition set the tone for the rest of the piece.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com