Abstract The phase or ''''chirped'''' video return of a synthetic aperture radar which carries two-dimensional information of target positions is modulated onto the ''''write'''' beam of a storage tube. The ''''read'''' beam of this storage tube has modulated thereon an image in the form of a holographic pattern representing an elemental unit of the two-dimensional target signals. This modulation image is formed by means of an electron mask placed between the electron gun of the read section of the tube and the screen of the tube. When the read beam is swept over the storage tube screen, an output signal is generated from this screen whenever the holographic image representing an elemental target unit matches or correlates with an actual such elemental target unit stored on the screen. This signal output is appropriately fed to a cathode ray tube for immediate display or to a recorder for future utilization.
A correlator device for converting holographic video signals to a form useful for a map type display comprising: an electron storage screen, means for directing an electron beam for use in writing signals onto said storage screen, means for scanning said storage screen with an electron beam for use in reading signals stored thereon, meaNs for modulating one of said beams with holographic video signals, electron mask means for modulating at least one of said beams in accordance with an image corresponding to an elemental video unit of the holographic video signals, said mask means being positioned in the path of said one of said beams, and means connected to said screen for providing an output signal when the image corresponding to the elemental video unit corresponds to an image in accordance with said holographic video signals.
Claim 2
Dependent Claim
137 words
A correlator device for converting holographic video signals to a form useful for a map type display comprising: an electron storage screen, means for directing an electron beam for use in writing signals onto said storage screen, means for scanning said storage screen with an electron beam for use in reading signals stored thereon, meaNs for modulating one of said beams with holographic video signals, electron mask means for modulating at least one of said beams in accordance with an image corresponding to an elemental video unit of the holographic video signals, said mask means being positioned in the path of said one of said beams, and means connected to said screen for providing an output signal when the image corresponding to the elemental video unit corresponds to an image in accordance with said holographic video signals.
Claim 3
Dependent Claim
26 words
The device of claim 1 wherein one of said modulating means modulates said writing beam and the other of said modulating means modulates said reading beam.
Claim 4
Dependent Claim
41 words
The device of claim 2 wherein said means for modulating said reading beam comprises an electron mask having slots formed therein for passing electrons therethrough, said slots being arranged in a pattern corresponding to that of the holographic elemental video unit.
Claim 5
Dependent Claim
19 words
The device of claim 3 wherein said slots are in the form of a plurality of substantially concentric circles.
Claim 6
Dependent Claim
23 words
The device of claim 4 wherein said slots have increasingly narrower widths in accordance with their distances from the center of said mask.
Claim 7
Dependent Claim
18 words
The device of claim 1 wherein said holographic video signals comprise the output of a synthetic aperture radar.