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DME ground apparatus

  • US 7,639,174 B2
  • Filed: 05/29/2008
  • Issued: 12/29/2009
  • Est. Priority Date: 05/31/2007
  • Status: Active Grant
First Claim
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1. A DME ground apparatus comprising:

  • an aerial unit that receives an interrogation signal from an aircraft;

    a transponder unit that receives the interrogation signal from the aerial unit, generates a response signal in response to the interrogation signal and generates and transmits squitter pulses; and

    a monitor control unit that monitors and controls the transponder unit, whereinthe transponder unit monitors a transmission rate at which the response signal is transmitted, which has been generated by decoding the interrogation signal received, and, in accordance with a result of monitor, transmits the response signal when the transmission rate reaches a preset value, and transmits the squitter pulses in place of the response signal when the transmission rate does not reach the present value.

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