# US 2011/0032519 A1 · System for detecting the inclination of light sources, in particular of precision approach slope indicators of an airport runway > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2011/0032519 A1 - Document ID: US20110032519A1 - Status: Published application - Kind: A1 - Application number: 12/536,248 - Filed: 2009-08-05 - Published: 2011-02-10 - Earliest claimed: 2009-08-05 - Inventors: Alberto Coletti; Luigi Piccari; Mario Zitelli - Web page: https://patentgrep.com/patent/US20110032519A1 ## CPC - G05D 1/0676: {specially adapted for landing} - G01C 9/06: Electric or photoelectric indication or reading means - G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES - G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S) ## Abstract The present invention relates to a system for detecting the inclination of one or more light beams, having at least one sharp colour transition, emitted by one or more light sources, in particular PAPIs or APAPIs, comprising measuring means (103) for measuring an inclination, and optoelectronic means (120, 121) for acquiring images which means are capable to be inclinated by first powered means (122), the inclination measuring means (103) being integrally coupled to optoelectronic means (120, 121) so as to measure the inclination of the latter, and wherein the system further comprises electronic processing means (62) capable to control the first powered means (122) an the basis of the images acquired by the optoelectronic means (120, 121) so that, when the system carries out a detection of the inclination of said one or more light beams, said at least one sharp colour transition appears in at least one corresponding predetermined position of said acquired images, said electronic processing means (62) reading an inclination value outputted by the inclination measuring means (103) for displaying the same on a display. The present invention further relates to the related detecting process. ## Claims ### Claim 1 System for detecting the inclination of one or more light beams, having at least one sharp colour transition, emitted by one or more light sources, in particular precision approach slope indicators, comprising measuring means for measuring an inclination, and optoelectronic means for acquiring images which means are capable to be inclinated by first powered means, the inclination measuring means being integrally coupled to optoelectronic means so as to measure the inclination of the latter, and wherein the system further comprises electronic processing means capable to control the first powered means on the basis of the images acquired by the optoelectronic means so that, when the system carries out a detection of the inclination of said one or more light beams, said at least one sharp colour transition appears in at least one corresponding predetermined position of said acquired images, said electronic processing means reading an inclination value outputted by the inclination measuring means for displaying the same on a display. ### Claim 2 (depends on 1) System according to claim 1, wherein the image acquiring optoelectronic means includes a measure camera, preferably comprising a CMOS sensor, still more preferably of 1280×1024 colour pixels, and provided with objective with single lens. ### Claim 3 (depends on 2) System according to claim 2, wherein the first powered means is capable to carry out an inclination of the measure camera with about 0.3′ of resolution. ### Claim 4 (depends on 1) System according to claim 1, wherein the inclination measuring means comprises a precision clinometer with single axis. ### Claim 5 (depends on 1) System according to claim 1, wherein it further comprises thermostatic means, preferably comprising a controlled temperature heater, controlled by the electronic processing means, capable to keep the inclination measuring means at a predetermined, preferably adjustable, temperature. ### Claim 6 (depends on 1) System according to claim 1, wherein the electronic processing means is capable to compensate a misalignment of the integral coupling between the inclination measuring means and the image acquiring optoelectronic means. ### Claim 7 (depends on 1) System according to claim 1, wherein the inclination measuring means, the image acquiring optoelectronic means, and the first powered means are housed in a measurement head, mounted on a rough positioning apparatus, preferably a precision tripod, which measurement head further comprises self-leveling means, integrally coupled to the image acquiring optoelectronic means, capable to automatically provide a horizontal plane of absolute reference with respect to a geographical vertical line, whereby said inclination value is related to said reference horizontal plane. ### Claim 8 (depends on 7) System according to claim 7, wherein the self-leveling means comprises a reference plate, to which a double axis clinometer capable to detect an inclination of the plate about a pitch axis and a roll axis is integrally coupled, the system further comprising second powered means, controlled by electronic feedback controlling means on the basis of an inclination value outputted by the double axis clinometer, which electronic feedback controlling means is capable to rotate the plate about said pitch and roll axes. ### Claim 9 (depends on 1) System according to claim 1, wherein it further comprises third powered means, controlled by the electronic processing means, capable to rotate the image acquiring optoelectronic means about a vertical axis orthogonal to a reference horizontal plane, whereby the third powered means is capable to control a steering orientation of the image acquiring optoelectronic means. ### Claim 10 (depends on 1) System according to claim 1, wherein it further comprises fourth powered means, controlled by the electronic processing means, capable to control a vertical position of the image acquiring optoelectronic means. ### Claim 11 (depends on 2) System according to claim 2, wherein the image acquiring optoelectronic means further includes a panning camera integrally coupled to the measure camera, and wherein the electronic processing means controls the first powered means first on the basis of the images acquired by the panning camera and then, once said one or more light beams appear in the images acquired by the panning camera, on the basis of the images acquired by the measure camera. ### Claim 12 (depends on 1) System according to claim 1, wherein the electronic processing means is capable to display on said display indications related to a correction of an inclination of said one or more light sources. ### Claim 13 (depends on 1) System according to claim 1, wherein the electronic processing means is capable to measure an intensity of said one or more light beams on the basis of the images acquired by the optoelectronic means. ### Claim 14 (depends on 1) System according to claim 1, wherein the electronic processing means is capable to measure an orientation of said at least one sharp colour transition in at least one of said images acquired by the optoelectronic means. ### Claim 15 Process for detecting the inclination of one or more light beams, having at least one sharp colour transition, emitted by one or more light sources, in particular precision approach slope indicators, comprising the following steps: acquiring images of said one or more light beams through optoelectronic means; processing said images for checking whether said at least one sharp colour transition appears in at least one corresponding predetermined position thereof; in the case where said at least one sharp colour transition does not appear in said at least one corresponding predetermined position, controlling first powered means so as to modify an inclination of the optoelectronic means; and in the case where said at least one sharp colour transition appears in said at least one corresponding predetermined position, measuring an inclination value of the optoelectronic means. ### Claim 16 (depends on 15) Process according to claim 15, wherein it further comprises the following step: displaying said inclination value on a display. ### Claim 17 (depends on 15) Process according to claim 15, wherein it further comprises the following preliminary step: controlling further powered means for positioning the optoelectronic means so as to shot said one or more light beams. ### Claim 18 (depends on 17) Process according to claim 17, wherein the optoelectronic means comprises a panning camera and a measure camera, and wherein in the preliminary step images acquired by the panning camera are processed for checking that said one or more light beams appear therein, whereas the subsequent processing for checking whether said at least one sharp colour transition appears in at least one corresponding predetermined position thereof is carried out on images acquired by the measure camera. ### Claim 19 (depends on 15) Process according to claim 15, wherein it further comprises the following step: displaying on a display indications related to a correction of an inclination of said one or more light sources. ### Claim 20 (depends on 15) Process according to claim 15, wherein it further comprises the following step: measuring an intensity of said one or more light beams on the basis of the images acquired by the optoelectronic means. ### Claim 21 (depends on 20) Process according to claim 20, wherein the intensity of said one or more light beams is measured in a plurality of angles between the optoelectronic means and said one or more light sources, and wherein it further comprises the following step: interpolating the intensities measured with a reference intensity diagram, preferably in proximity to said at least one sharp colour transition. ### Claim 22 (depends on 20) Process according to claim 20, wherein said light beams are at least two, and wherein it further comprises the following step: summing the interpolated intensity diagrams of all the light beams, for obtaining an intensity diagram of said one or more light sources. ### Claim 23 (depends on 20) Process according to claim 20, wherein it further comprises the following step: processing a width of said one or more light beams on a horizontal plane. ### Claim 24 (depends on 15) Process according to claim 15, wherein it further comprises the following step: measuring an orientation of said at least one sharp colour transition in at least one of said images acquired by the optoelectronic means. ### Claim 25 System for detecting the inclination of one or more light beams, having at least one sharp color transition, emitted by one or more light sources, in particular precision approach slope indicators, comprising; an inclination measurer designed to measuring inclination; image acquisition optoelectronics designed to acquire images; a first inclinator designed to incline the image acquisition optoelectronics; wherein the inclination measurer is mechanically coupled to image acquisition optoelectronics so as to measure the inclination of the image acquisition optoelectronics; an electronic processing unit that controls the first inclinator on the basis of the images acquired by the image acquisition optoelectronics so that, when the system carries out a detection of the inclination of said one or more light beams, said at least one sharp color transition appears in at least one corresponding predetermined position of said acquired images, said electronic processing unit reading an inclination value outputted by the inclination measuring means for displaying the same on a display.