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CORRELATION TYPE PHASE DETECTOR

  • US 3,875,394 A
  • Filed: 04/20/1973
  • Issued: 04/01/1975
  • Est. Priority Date: 04/20/1973
  • Status: Expired due to Term
First Claim
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1. Apparatus for determining the phase angles of each of a plurality of signals relative to predetermined phase angles of reference waves having the same frequencies as the signals, said plural signals being frequency multiplexed on a common line and each having a different frequency, said frequencies all being an integral multiple of a further frequency, comprising means responsive to the frequency multiplexed signals on the common line and the reference waves for deriving product signals indicative of sin ( omega it + phi 1) sin omega it and sin ( omega it + phi i) cos omega it for each of the frequencies, where:

  • omega i 2 pi fi, fi is selectively each of the frequencies, t time, and phi i phase angle between the reference wave and the signal for each of the frequencies fi, integration means responsive to each of the product signals, means for activating the integration means for the same time period for each product signal, said period being an integral multiple of the period of the further frequency, whereby the integration means derives, at the end of each activation period, first and second signals respectively indicative of sin phi and cos phi for each of the frequencies, and computer means responsive to the first and second signals for each of the frequencies for deriving an indication of phi for each of the frequencies.

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