Abstract A radar recorder system is disclosed for recording and playing back information for a radar system. A motion picture camera is positioned opposite the face of the cathode ray tube (CRT) and is stepped in synchronism with the display on the tube each time the radar sweep passes a reference such as true North. Thus, once each scan of the radar beam, a picture of the corresponding CRT display is taken by the camera. A coder is provided for directing onto a portion of the exposed film information such as time, location, and other information for identifying each frame of the film. A video phototube and video preamplifier are provided for replaying the information stored on the film. In a manner similar to a flying-spot scanner, the cathode ray tube scans across the film in the camera with the light passing through the film being received by the video phototube which converts the sensed light to an electronic signal which then may be replayed on a PPI display. In the replay mode, the camera is stepped under the control of a digital computer so that selected frames of the film may be displayed for varying intervals.
A radar recording and video playback system comprising in combination cathode ray tube means for displaying a radar sweep signal, means receiving said radar signal for driving said cathode ray tube, a motion picture camera aligned opposite the face of the cathode ray tube, a film magazine mounted on said camera, undeveloped motion picture film mounted in said magazine for relative movement with respect to said camera, a solenoid means for advancing said undeveloped film in said camera, a frame of which advances each time said radar sweep completes rotation through a 360* angle, the face of said cathode ray tube having a long period phosphor decay substance thereon, said camera having a shutter with a rapid shutter speed for minimizing information loss for each advancement of the film, a coded means including a mirror for directing identification data onto a portion of the undeveloped film frame being exposed, the cathode ray tube having an electron beam which scans the face of said tube for producing a source of light, the motion picture film magazine including therein a developed motion picture film substituted for the undeveloped film, and a video phototube means for directing the light from the electron beam of the cathode ray tube through frames on said developed film in said camera onto said video phototube, whereby said camera has its shutter in a position which so enables the light to pass through the frames, said phototube converting video information on said developed film into a corresponding electrical signal, and means for advancing said developed film in said camera.
Claim 2
Dependent Claim
261 words
A radar recording and video playback system comprising in combination cathode ray tube means for displaying a radar sweep signal, means receiving said radar signal for driving said cathode ray tube, a motion picture camera aligned opposite the face of the cathode ray tube, a film magazine mounted on said camera, undeveloped motion picture film mounted in said magazine for relative movement with respect to said camera, a solenoid means for advancing said undeveloped film in said camera, a frame of which advances each time said radar sweep completes rotation through a 360* angle, the face of said cathode ray tube having a long period phosphor decay substance thereon, said camera having a shutter with a rapid shutter speed for minimizing information loss for each advancement of the film, a coded means including a mirror for directing identification data onto a portion of the undeveloped film frame being exposed, the cathode ray tube having an electron beam which scans the face of said tube for producing a source of light, the motion picture film magazine including therein a developed motion picture film substituted for the undeveloped film, and a video phototube means for directing the light from the electron beam of the cathode ray tube through frames on said developed film in said camera onto said video phototube, whereby said camera has its shutter in a position which so enables the light to pass through the frames, said phototube converting video information on said developed film into a corresponding electrical signal, and means for advancing said developed film in said camera.
Claim 3
Dependent Claim
35 words
The radar recorder of claim 1 further comprising means for superimposing a signal representing an area map on said radar signal to thereby provide background identification information on the display of said cathode ray tube.