System for assisting navigation operation of moving objects

An approach slope indicator system for assisting in landing operations of aircrafts along a predefined glide slope to a runway, comprising:

• a plurality of first infrared light emitters for emitting infrared light over a first range of wavelengths within a first fixed range of angles of radiation, and
• a plurality of second infrared light emitters for emitting infrared light over a second range of wavelengths within a second fixed range of angles of radiation,
• wherein the first and second ranges are at least partially non-overlapping,
• wherein the first and second infrared light emitters are positioned in groups with respect to the runway and emit light within, respectively, the first and second fixed range of angles of radiation (i) such that a first infrared light pattern of the first and second infrared light emitters is visible for a pilot of the aircraft by an infrared light detection system at the aircraft, when the aircraft matches the glide slope, and (ii) such that one or more second sets of infrared light patterns of combined groups of first and second infrared light emitters are visible for the pilot by the infrared light detection system, when the aircraft position is outside the glide slope.

A course marker light apparatus, comprising:

• a housing having an aperture which permits light to pass from the inside of the housing to the outside,
• a first infrared light emitter for emitting infrared light over a first range of wavelengths arranged inside the housing,
• a second infrared light emitter for emitting infrared light over a second range of wavelengths arranged inside the housing,
• a first infrared light filter which permits light within the first range of wavelengths to pass through, and
• a second infrared light filter which permits light within the second range of a wavelengths to pass through,
• wherein the first and second infrared light filters are arranged in a position relative to the aperture such that a first range of angles of radiation of infrared light which passes through the first infrared light filter and a second range of angles of radiation of infrared light which passes through the second infrared light filter are at least partially non-overlapping.