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Multi-channel radiometer imaging system

  • US 7,221,139 B2
  • Filed: 11/16/2005
  • Issued: 05/22/2007
  • Est. Priority Date: 09/18/2003
  • Status: Expired due to Fees
First Claim
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1. A radiometer system, comprising:

  • a plurality of balanced radiometer channels that receive an unknown signal and known reference, each balanced radiometer channel comprising a MMIC comprisinga first quadrature hybrid as an input having at least one radio frequency (RF) input and parallel signal outputs;

    at least one amplifier connected to each signal path output of said quadrature hybrid; and

    a second quadrature hybrid as an output connected to each at least one amplifier and having parallel RF outputs, wherein the at least one amplifier provides an equalized amplifier gain;

    a detector circuit the receives and detects the amplified output signal forming a detected signal; and

    a circuit that receives the detected signal and performs video signal digitization and conditioning and real-time corrections on any radiometer channels to account for changes in temperature or gain.

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