Abstract: A data processing arrangement is operative to combine data representing different kinds of information from disparate sources. The data is stored under assigned addresses having a mutually compatible co-ordinate format, and is processed using those addresses. Relevant portions of data from a very large amount of information can be readily extracted in this way, and combined with other data which is related by virtue of a common address. The arrangement is applicable to flight management of an aircraft.

Abstract: The invention provides a surveillance system comprising a number of infra-red detectors in an array, each of which is arranged to view a different portion of a field of view in order to discriminate between targets of different veiwed sizes at a target range. Each infra-red detector has in its output a threshold detector, the threshold level of which is determined by the mean output levels of adjacent detectors in the array. In a preferred example, for a given threshold detector in the output of a given infra-red detector the mean output level of two adjacent, but not immediately adjacent, infra-red detectors on one side and two adjacent, but not immediately adjacent detectors, on the other side are summed and the result divided by four to provide the reference level for the threshold detector concerned.

Abstract: The invention provides an image motion compensation arrangement for enabling stabilization of the line of sight of a scanned imaging system mounted on a vehicle. In one example the scanned imaging system is a television camera assembly which is resiliently mounted and carries a plane mirror on to which is directed, via an auto-collimating lens, light from a light emitting diode. Light reflected by the plane mirror passes back through the auto-collimating lens to be received by a detector having quadrant receiving surfaces which resolve the complex motion of the camera assembly during movement of the vehicle into two orthogonal components defining the angular error caused by the motion in the sight line of the camera. The two orthogonal components are utilized to provide a pair of electrical signals utilizable to correct for the image motion resulting from the rotation of the sight line.

Abstract: A field sequential television camera is provided in which a disc having a plurality of differently colored segmental filters is rotated in front of an image isocon camera tube. Normally six segmental filters are provided presenting sequentially, red, green and blue in order. The image section of the camera tube is arranged to be gated so that an electron image reaches the target only during a fraction of each sequential color field sufficient to permit operation of the target above the knee of its transfer characteristic.