这种逆向iff系统允许飞机使用现役1090mhz的IFF异频雷达收发机来询问目标区域，提供近空支援(CAS)，而不是标准的1030mhz。

The Reverse IFF system allows an aircraft providing close-air support (CAS) to interrogate a target area using its existing IFF transponder at 1090 MHz rather than the standard 1030 MHz.

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二次雷达是现代航空交通管制系统中的重要组成部分，它是通过对询问 信号应答而发现目标的雷达。

Secondary radar is an important equipment in modern air traffic control system, it identify the target by interrogator sending a inquiry toward the aircraft and the aircraft responsing in the air.

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该方案已经在实际二次雷达S模式询问机研制过程中得 以应用和验证，效果良好。

The method has been applied and verified in a new developed mode S SSR interrogator, and the system runs well.

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