Paraboloidal coupler for light wave guides

Passive background correction method for spatially resolved...

Passive beam derotator

Passive determination of ground target location

Passive determination of ground target location

Passive distance measurement using spectral phase gradients

Passive error compensating device for optical alignment

Passive optical range simulator device

Passive optical range simulator device

Passive optical rangefinder

Passive optical rangefinder-sextant

Passive radio altimeter

Passive range estimation using image size measurements

Passive range finding apparatus utilizing television sensors

Passive rangefinder

Passive ranging system especially for use with an electro-optica

Passive ranging technique for infrared search and track (IRST) s

Passive ranging to a target reflecting solar radiation

Passive ranging to source of known spectral emission

Passive ranging to source of known spectral emission