Abstract: A method and a system are recited for obtaining a true azimuth heading for correcting a coarse azimuth heading measured from an observation position to a specific selected target by operating a data acquisition system disposed at the observation position. In principle, data is acquired and measurements are taken to allow calculation of a calculated target, including error area limits. The calculated target surrounded by error area limits is presented as a search zone to an operator for searching, finding and indicating on a display, on which is superimposed at least one map, of the specific selected target. Once found, calculations of the true azimuth are performed, allowing the derivation of the true North. The method and a system are operative with a variety of maps, including digital terrain models and stellar maps.

Abstract: A method and a system are recited for obtaining a true azimuth heading for correcting a coarse azimuth heading measured from an observation position to a specific selected target by operating a data acquisition system disposed at the observation position. In principle, data is acquired and measurements are taken to allow calculation of a calculated target, including error area limits. The calculated target surrounded by error area limits is presented as a search zone to an operator for searching, finding and indicating on a display, on which is superimposed at least one map, of the specific selected target. Once found, calculations of the true azimuth are performed, allowing the derivation of the true North. The method and a system are operative with a variety of maps, including digital terrain models and stellar maps.

Abstract: Method and passive target data acquisition system operable continuously from an observation point for passively sighting a target and acquiring the target on a DTM for passively deriving target data and associated information without emitting radiations prone to detection. The location of the target is shown on a display, and so is an error-area due to measurement inaccuracies. When terrain topography causes the system to indicate more than one error-area, the target and the accompanying error-areas are displayed. The distance between error-areas indicates dead terrain zones. A north finding procedure provides accurate north direction correction to rough north readings taken with a coarse north-indicating device. The system is small enough for integration with handheld personal binoculars, and is operable from static and mobile observation points, possibly on a stabilized platform, on land, at sea, in the air, and in space.

Abstract: Method and passive target data acquisition system operable continuously from an observation point for passively sighting a target and acquiring the target on a DTM for passively deriving target data and associated information without emitting radiations prone to detection. The location of the target is shown on a display, and so is an error-area due to measurement inaccuracies. When terrain topography causes the system to indicate more than one error-area, the target and the accompanying error-areas are displayed. The distance between error-areas indicates dead terrain zones. A north finding procedure provides accurate north direction correction to rough north readings taken with a coarse north-indicating device. The system is small enough for integration with handheld personal binoculars, and is operable from static and mobile observation points, possibly on a stabilized platform, on land, at sea, in the air, and in space.