Method, system and apparatus for calibration of phased array radio frequency transceiver

A method of determining a total delay to a radio frequency (RF) signal caused by a path between a start point and an end point comprising:

• injecting a plurality of frequency tones at the start point, wherein the frequency tones are of different frequency selected independent of length of the path;
• receiving the plurality of frequency tones at the end point;
• measuring a plurality phase differences corresponding to difference of phase between the plurality of frequency tones injected at the start point and the corresponding plurality of the frequency tones received at the end point;
• determining a total delay to the RF signal caused by the path from at least more than one of the plurality of phase differences measured;
• determining a total phase shift to the RF signal from the total delay and a frequency of the RF signal,
• wherein the plurality of frequency tones are of frequencies f1, f2, f3, . . . fn and the plurality of corresponding phase differences are φ1, φ2, . . . φn, in that each phase difference φ1, φ2, . . . φn is less than 2π and the total delay is determined from a first relation:
• [
• -
• 1
• 0
• 0
• 0
• …
• f
• 1
• 0
• -
• 1
• 0
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• …
• f
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• ⋮
• 0
• 0
• 0
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• 1
• …
• f
• n
• ]
• ⁡
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• m
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• m
• 2
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• m
• n
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• =
• 1
• 2
• ⁢
• ⁢
• π
• ⁡
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• φ
• 1
• φ
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• ,
• in that, m1 through mn representing a number of wraps over 2π of the phase shift and are integers.