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Secondary surveillance radar system, ground equipment for use therein, and response signal checking method applied thereto

  • US 20050083226A1
  • Filed: 09/03/2004
  • Published: 04/21/2005
  • Est. Priority Date: 09/05/2003
  • Status: Active Grant
First Claim
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1. A secondary surveillance radar system for use in surveillance of an airspace, which reliably achieves surveillance of the airspace even when an aircraft including a mode S transponder and an aircraft including an ATCRBS transponder are both located in the airspace, wherein both of a time interval between time when transmission of an all-call interrogation signal specific for mode S is completed and time when the transmission of an all-call interrogation signal specific for mode A is started and a time interval between time when transmission of the all-call interrogation signal specific for mode S is completed and time when transmission of an all-call interrogation signal specific for mode C is started is varied in units of one all-call time period.

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