Multi-band receiver using harmonic synchronous detection

摘要

A method and apparatus for detecting an object. A first collimated beam having a first frequency and a second collimated beam having a second frequency is transmitted. At least one of the first frequency and the second frequency is changed through a range of frequencies and a power level for at least one of the first collimated beam and the second collimated beam is changed through a range of power levels. A range of fundamental difference frequency signals for each power level in the range of power levels are monitored for, in response to transmitting the first collimated beam and the second collimated beam using the range of frequencies and the range of power levels. The range of fundamental difference frequency signals is generated by the object having non-linear electrical characteristics in response to receiving the first collimated beam and the second collimated beam.

主权项

1. An apparatus comprising:
a transmitter system capable of transmitting a first collimated beam having a first frequency and a second collimated beam having a second frequency; a target profile database; a receiver system capable of monitoring for a fundamental difference frequency signal having a difference frequency equal to a difference between the first frequency and the second frequency, wherein the fundamental difference frequency signal is generated by an object having non-linear electrical characteristics in response to receiving the first collimated beam and the second collimated beam; and a processor unit connected to the transmitter system and the receiver system, wherein the processor unit is capable of controlling an operation of the transmitter system and the receiver system to change at least one of the first frequency and the second frequency through a range of frequencies; change a power level of at least one of the first collimated beam and the second collimated beam through a range of power levels; detect a range of fundamental difference frequency signals for each power level in the range of power levels in response to the transmitter system transmitting the first collimated beam and the second collimated beam using the range of frequencies and the range of power levels; compare the fundamental difference frequency signal to the target profile database, and responsive to comparing the fundamental difference signal to the target profile database, determine whether the difference frequency matches an object in the target profile database; responsive to determining that the difference frequency matches a difference frequency in the target profile database, identifying an object corresponding to the difference frequency in the target profile database; responsive to identifying the object, select another power level for the first collimated beam and the second collimated beam, the another power level being selected to damage the object; and transmit at the object the first collimated beam and the second collimated beam at the another power level.