초록 ▼

A lider countermeasure receives an interrogating laser beam and returns a beam having a distorted phase point such that the interrogating system generates a false angular portion for the returned radiation. The false phase front is achieved by independent manipulations of the amplitude and phase of

A lider countermeasure receives an interrogating laser beam and returns a beam having a distorted phase point such that the interrogating system generates a false angular portion for the returned radiation. The false phase front is achieved by independent manipulations of the amplitude and phase of the returned signal.

대표청구항 ▼

An optical system, located at a target location, for receiving interrogating optical radiation from an interrogating system, having an interrogating wavelength, and for returning a signal substantially on said interrogating wavelength with a return near-field amplitude and near-field phase front, sa

An optical system, located at a target location, for receiving interrogating optical radiation from an interrogating system, having an interrogating wavelength, and for returning a signal substantially on said interrogating wavelength with a return near-field amplitude and near-field phase front, said near-field amplitude and near-field phase front being adapted to present in the far field a far field signal having a distorted phase front such that said interrogating system will receive an indication of a false target location, comprising: input/output means for passing said interrogating radiation into said optical system and for transmitting return radiation back to said interrogating system; and optical processing means responsive to input radiation from said input/output means, for modulating said input radiation with said return near-field amplitude and near-field phase front and for conjugating radiation to be returned, in which; said optical processing means includes first and second DFWM means for modulating radiation, one of said first and second DFWM means being adapted to generate in response to a wavefront a first modified wavefront carrying a predetermined deceptive phase distribution and for propagating said modified wavefront to further optical means, and the other of said first and second DFWM means for generating a second modified wavefront compensated for atmospheric distortion and propagating said second modified wavefront to other optical means; and said input/output means includes means for receiving interrogating radiation travelling along a first axis and for propagating return radiation along said first axis, said input/output means also performing a transformation of said interrogating radiation to the Fourier domain to form a transformed wavefront carrying a phase distribution characteristic of said interrogating radiation and propagating such transformed incoming Fourier radiation to said optical processing means and intercepting a processed optical wavefront from said optical processing means and transforming said processed wavefront to the spatial domain as an output wavefront, whereby said system directs said output wavefront back to said interrogating system with said near-field wavefront.