System and method for time reversal situational awareness

摘要

A system and method are disclosed for providing time reversal situational awareness. An input filter receives an input signal at a first frequency and a pump signal at a second frequency and blocks signals at a third predetermined frequency. A non-linear medium performs a second order operation or a third order operation on the filtered input signal and the filtered pump signal to produce an output signal at the third frequency, the third frequency lower than the first frequency and the second frequency. An output filter is coupled to receive the output signal from the non-linear medium and blocks signals at the first frequency and at the second frequency such that a filtered output signal is generated that is a phase conjugate signal which provides time reversal situational awareness.