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Carrier-modulated coherency monitoring system

  • US 4,048,563 A
  • Filed: 10/17/1975
  • Issued: 09/13/1977
  • Est. Priority Date: 10/17/1975
  • Status: Expired due to Term
First Claim
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1. In a radio transmission system for transmitting information between spaced location, the combination comprising:

  • signal source means for generating a carrier signal of radio frequency, frf,source means for generating a synchronizing code having a repetitive time frame which is numerically related to the period, 1/frf, of said carrier signal by a predetermined fixed multiplier,modulator means connected to said carrier signal source and said synchronizing code source for modulating said carrier signal with said synchronizing code,transmitter means for transmitting said modulated carrier signal,receiver means for receiving said modulated carrier signal and including means for recovering said carrier signal and said synchronizing code from said modulated carrier signal, andmeasurement means responsive to said recovered carrier signal and synchronizing code and including counter means and counter control means, said counter control means being responsive to said synchronizing code for controlling said counter means to register a count of the number of whole and fractional cycles of said carrier signal received in a measurement time interval corresponding to the repetitive time frame of said synchronizing code as received.

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