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SYSTEMS AND METHODS FOR SELF-TEST OF A RADAR ALTIMETER

  • US 20070139259A1
  • Filed: 12/19/2005
  • Published: 06/21/2007
  • Est. Priority Date: 12/19/2005
  • Status: Active Grant
First Claim
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1. A radar altimeter system including a transmitter having a Direct Digital Synthesizer (DDS) and a Digital Phase Lock Loop, the system comprising:

  • a first component configured to generate a voltage signal derived by comparing a fixed reference frequency to a ramped frequency signal generated by the DDS based on a clock-based reference signal;

    a second component configured to integrate the generated voltage signal over a predefined range of clock signals;

    a third component configured to sample the integration at a previously defined clock tick;

    a fourth component configured to compare the sample to a desired value; and

    a fifth component configured to provide an indication that the radar altimeter is malfunctioning if the comparison exceeds a predefined threshold value.

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