Device and method for assisting in the location of celestial objects

Abstract

The invention relates to a device for assisting in the location of celestial objects, comprising:- a pair of binoculars equipped with a combination of sensors measuring horizontal coordinates of a celestial observation area, which combination comprises: a magnetometer, an accelerometer and a gyroscope;- a geolocation module for determining position, date and time data of the observation;- a processing module determining equatorial celestial coordinates of the observation area using the measurements of the combination of sensors and the data of the geolocation module;- an interface for selecting a celestial object from a database containing equatorial celestial coordinates of selectable celestial objects;- a comparison module calculating a difference between the coordinates determined by the processing module and the coordinates of the selected object;- a guidance module generating a guidance signal based on the calculated difference;

Description

Title of the invention: Device and method for assisting in the location of celestial objects Technical field

[0001] The subject of the invention is a device and a method for assisting in the location of celestial objects. The subject of the invention is also a computer program allowing the implementation of the method.

[0002] The invention relates in particular to the field of techniques for assisting in the location of celestial objects, such as stars, planets, comets, asteroids, constellations, galaxies, satellites, etc. State of the art

[0003] Today, to observe celestial objects in the sky, more and more amateurs use binoculars with a fixed focal length, that is to say without zoom (unlike telescopes dedicated to astronomy). Binoculars have the advantage of being easier to transport and handle than telescopes, but locating celestial objects in the sky is however more complex, in particular due to their limited resolution, their restricted field of vision, their increased sensitivity to light interference, and their lack of stability.

[0004] There is therefore a need to assist the user in locating celestial objects. Usually, the precise location of celestial objects requires the use of sophisticated observation instruments such as telescopes with electronic tracking systems, for example of the type described in patent document EP3494430A1.

[0005] However, these systems can be expensive, bulky, require a relatively large computing load and are in any case difficult to transpose into a binocular, except by making complex modifications.

[0006] Patent document US2016124210 proposes an assistance device adaptable to binoculars. A mechanical support makes it possible to hold a smartphone (smartphone) on the binoculars. The Skyview® computer application installed in the smartphone assists the user in locating celestial objects by using the measurement data from a GPS integrated in said smartphone. However, since the smartphone is relatively bulky, it is understandable that handling the binoculars equipped with the smartphone becomes difficult. Furthermore, the location of celestial objects remains imprecise in practice.

[0007] The invention aims to remedy all or part of the aforementioned drawbacks. In particular, one objective of the invention is to propose a device for assisting the loca lization which is dedicated to binoculars, and whose localization precision is improved compared to the solutions of the prior art. Another objective of the invention is to propose a localization assistance technique which is simple, reliable, robust and whose computational load is reduced. Presentation of the invention

[0008] The solution proposed by the invention is a device for assisting in the location of celestial objects, comprising: - a binocular comprising an optical system, said binocular being equipped with at least one combination of sensors configured to measure horizontal coordinates of a celestial observation area, which combination of sensors comprises: at least one magnetometer, one accelerometer and one gyroscope; - a geolocation module to determine position, date and time data of the observation; - a processing module for determining equatorial celestial coordinates of the celestial observation area using measurements from the sensor combination and data from the geolocation module; - a database containing equatorial celestial coordinates of selectable celestial objects; - a user interface for selecting a celestial object from the database; - a comparison module for calculating a difference between the equatorial celestial coordinates determined by the processing module and the celestial coordinates of the selected celestial object; - a guidance module for generating a guidance signal of which at least one characteristic is a function of the difference calculated by the comparison module.

[0009] The present invention provides a device for assisting in the location of celestial objects which is easy to use, economical, with increased precision compared to prior art solutions and which can be easily used with conventional binoculars, by amateur observers / users who do not necessarily have in-depth knowledge of astronomy or specialized equipment.

[0010] Other advantageous features of the invention are listed below. Each of these features may be considered alone or in combination with the remarkable features defined above. Each of these features contributes, where appropriate, to the resolution of specific technical problems defined further in the description and in which the other features defined above do not necessarily contribute. The following features may thus be the subject, where appropriate, of one or more divisional patent applications:

[0011] According to one embodiment, the combination of sensors comprises at least two magnetometers and / or the binocular is equipped with several combinations of sensors.

[0012] According to one embodiment, the measurements of the sensor combination(s) used to determine the equatorial celestial coordinates of the celestial observation zone comprise the average or median of the magnetometer measurements.

[0013] According to one embodiment, the processing module is configured to take the average or median of the real-time measurements of the sensor combination to determine the equatorial celestial coordinates of the celestial observation area.

[0014] According to one embodiment, the processing module is configured to: a) receive measurements from the magnetometer; b) access a world magnetic model (WMM) representing the Earth's magnetic field; c) apply corrections to the magnetometer measurements based on information obtained from the WMM to calculate corrected measurements; d) use the corrected measurements to determine the equatorial celestial coordinates of the celestial observation area.

[0015] According to one embodiment, the binoculars comprise a display means, the processing module being configured to generate and / or select information to be displayed on said display means.

[0016] According to one embodiment, the display means is installed so as to display the information in an image plane of the optical system of the binoculars.

[0017] According to another embodiment, the display means is a screen installed in the image plane so as to only partially obstruct the image of the celestial observation zone observed through an eyepiece of the optical system.

[0018] According to another embodiment, the display means is a semi-reflective screen installed in the image plane so that the displayed information is superimposed on the image of the celestial observation zone observed through an eyepiece of the optical system.

[0019] According to another embodiment, the display means is in the form of a screen projecting a digital image of the information towards a semi-reflecting plate, which plate is arranged in the optical system in such a way that said digital image is superimposed on the image of the celestial observation zone observed through an eyepiece of said optical system.

[0020] According to one embodiment, the guidance module is configured to generate the guidance signal if the calculated difference is less than or equal to a first predetermined threshold value.

[0021] According to one embodiment, the guidance module is configured to stop generating the guidance signal when the difference calculated by the comparison module remains less than or equal to a second predetermined threshold value for a predetermined duration.

[0022] According to one embodiment, the sensors are housed in a housing designed to be mounted on the binoculars.

[0023] According to one embodiment, the geolocation module, the processing module, the comparison module and the guidance module are integrated into a smartphone or a tablet.

[0024] According to another embodiment, the sensors, the geolocation module, the processing module, the comparison module and the guidance module are integrated into the binoculars.

[0025] According to one embodiment, the guidance module is configured to generate an audible signal and / or a visual signal and / or a vibratory signal of which at least one characteristic is amplified when the difference calculated by the comparison module decreases.

[0026] Another aspect of the invention relates to a method for assisting in the location of celestial objects, comprising the following steps: a) equipping a binocular comprising an optical system, with at least one sensor combination configured to measure horizontal coordinates of a celestial observation area, which sensor combination comprises: at least one magnetometer, one accelerometer and one gyroscope; b) determining position, date and time data of the observation; c) determining equatorial celestial coordinates of the celestial observation area using the measurements of the sensor combination and the data determined in step; d) selecting a celestial object from a database containing selectable celestial objects associated with equatorial celestial coordinates; e) calculating a difference between the equatorial celestial coordinates determined in step c) and the celestial coordinates of the selected celestial object;f) generating a guidance signal of which at least one characteristic is a function of the difference calculated in step e).;

[0027] According to one embodiment, step a) consists of equipping the binoculars with several combinations of sensors and / or a combination of sensors comprising at least two magnetometers; and step c) is carried out using the average or the median of the measurements of the magnetometers.

[0028] According to one embodiment, the method further comprises the following steps: automatically selecting from the database one or more celestial objects whose equatorial celestial coordinates correspond to those determined in step c); generating and / or selecting information on said selected celestial object(s); displaying said information on a display means.

[0029] According to one embodiment, the method further comprises the following steps: c') determining geographic coordinates of a terrestrial area using the measurements of the sensor combination and the data determined in step b); d') selecting a terrestrial reference point from a database containing points of selectable terrestrial reference points associated with geographic coordinates; e') calculating a difference between the geographic coordinates determined in step c') and the geographic coordinates of the selected terrestrial reference point; f') generating a guidance signal of which at least one characteristic is a function of the difference calculated in step e').

[0030] Yet another aspect of the invention relates to a computer program comprising code instructions for executing steps b), c), e) and f) of the aforementioned method, when said instructions are executed by a processing module. Brief description of the figures

[0031] Other advantages and characteristics of the invention will appear more clearly on reading the description of the embodiments which follow, with reference to the appended drawings, produced as indicative and non-limiting examples and in which:

[0032] [Fig.l] is an overall view of a device according to the invention.

[0033] [Fig.2A] and [Fig.2B] illustrate user interfaces for selecting a celestial object from a database.

[0034] [Fig.3] is a diagram illustrating the interaction of different elements of a device according to the invention and showing different steps of a method according to the invention.

[0035] [Fig.4A] and [Fig.4B] show diagrams of examples of the production of a housing integrating a set of sensors.

[0036] [Fig.5] is a simplified diagram of an optical system of a binocular in which a display means is integrated according to one embodiment.

[0037] [Fig.6] is a simplified diagram of an optical system of a binocular in which a display means according to another embodiment is integrated. Description of the embodiments

[0038] The invention may implement one or more computer programs executed by equipment. For the sake of clarity, it should be understood within the meaning of the invention that "equipment does something" or that "the computer program does something" means "the computer program executed by a processing module of the equipment does something".

[0039] Where appropriate and to possibly supplement their current definition, the following clarifications are made to certain terms used in the claims and the description:

[0040] - “Twin” can be understood in a non-limiting manner as a simple twin or a pair of binoculars.

[0041] - "Optical system" can be understood as the whole organized and integrated in the a combination of optical components, such as optical lenses and prisms, designed to capture, direct and modify light rays coming from an observation area in order to enlarge the image perceived by the observer.

[0042] - “Computer resource” can be understood in a non-limiting manner as: component, hardware, software, file, connection to a computer network, amount of RAM, hard disk space, bandwidth, processor speed, number of CPUs, etc.

[0043] - “Processing module” can be understood in a non-limiting manner as: processor, microprocessors, CPU (for Central Processing Unit).

[0044] - “Computer program” can be understood as: software, application in computer science, or software, whose code instructions are notably executed by a processing module.

[0045] - As used herein, unless otherwise indicated, the possible use of adjectives ordinals "first", "second", etc., to describe an object or stage merely indicates that different occurrences of similar objects or stages are being referred to and does not imply that the objects or stages so described must be in any given sequence, whether in time, space, ordering, or otherwise.

[0046] - “X and / or Y” means: X alone or Y alone or X+Y.

[0047] - Generally speaking, it will be appreciated that in the various attached drawings, the objects are arbitrarily drawn to make them easier to read.

[0048] In the example of [Fig. 1], the binoculars 1 are conventional commercial binoculars having two parallel optical tubes 10, 11, each being equipped with an eyepiece and one or more optical lenses and / or prisms forming the optical system. The two tubes 10, 11 are connected by a central bridge provided with a focusing mechanism 12, making it possible to adjust the sharpness of the image. The binoculars 1 may also include means for adjusting the interpupillary distance in order to adapt to the morphology of each user.

[0049] Binoculars are typically classified by their magnification power and the diameter of their objective lenses. For example, in a pair of "8x42" binoculars, the "8" indicates a zoom factor (or magnification; proportional to the focal length) of 8 times and the "42" indicates an objective lens diameter of 42 mm.

[0050] According to one embodiment, the value of the zoom factor of the binoculars 1 is between 2 and 20, preferably greater than 8 for the observation of celestial objects. This zoom is preferably fixed, but can be variable.

[0051] The binoculars 1 are equipped with one or more combinations of sensors 20 configured to measure horizontal coordinates of a zone ZO observed through said binoculars.

[0052] In [Fig. 1], the observation zone ZO corresponds to a zone of the celestial vault V. For example, the horizontal coordinates of the observation zone ZO correspond to those of the center of said zone ± 10%.

[0053] The horizontal coordinate system is used to locate celestial objects in the sky. This system uses azimuth and altitude measurements. Azimuth is the direction of a celestial object along the horizon, measured in degrees along the horizon from north to east. Altitude is the height of the celestial object above the horizon, measured in degrees. An object that is directly above the observer has an altitude of 90 degrees.

[0054] According to one embodiment, the sensor combination 20 comprises at least one magnetometer for measuring the azimuth, an accelerometer for measuring the altitude and a gyroscope for measuring the rotation speed. This sensor combination makes it possible to accurately measure the horizontal coordinates.

[0055] The measurement of the azimuth by the magnetometer can be disturbed by surrounding metallic masses. Also, the combination of the magnetometer and the gyroscope makes it possible to measure the azimuth precisely and more reliably, in particular when the movement of the binoculars, measured by the gyroscope, is not consistent with the measurement of the magnetic field by the magnetometer.

[0056] To further improve the reliability of the magnetometer measurements, the sensor combination 20 advantageously comprises at least two magnetometers and / or several sensor combinations are used as explained further in the description.

[0057] The celestial coordinates vary depending on the position of the observer on Earth, the date and the time. Therefore, the device comprises a geolocation module 4 determining the position, the date and the time of the observation.

[0058] This geolocation module 4 is preferably a GPS satellite geolocation module making it possible to obtain a precise and reliable measurement of the position, date and time of observation. Other types of satellite geolocation modules such as GLONASS, BEIDOU or GALILEO can however be used. Although less precise, it is also possible to use a module capable of estimating the geographical position of the observer, the date and time from data coming from mobile telephone network antennas and / or Wifi® access points.

[0059] According to one embodiment, the geolocation module 4 is a GPS module conventionally integrated into a terminal 3 of the observer / user, in particular a smartphone (smart phone), a tablet or a laptop. According to another embodiment, the geolocation module 4 is integrated into a housing 2 in which the sensors 20 are also installed.

[0060] The device also comprises a processing module 5 configured to determine equatorial celestial coordinates of the observation zone ZO in using the measurements of the sensor combination(s) 20 and the data from the geolocation module 4. According to one embodiment, the processing module 5 is integrated into the housing 2. It may also be a processing module integrated in a conventional and native manner into the terminal 3.

[0061] When the device comprises several magnetometers (either the sensor combination 20 comprises two or more magnetometers, or several magnetometer / accelerometer / gyroscope combinations are used), then the average or median of the measurements of said magnetometers is advantageously calculated by the processing module 5 to improve the accuracy of the measurements, while requiring few computational resources from said processing module. The measurements of the magnetometers can in fact be affected by systematic or random errors or uncertainties such as their resolution, their accuracy, their temporal stability (in particular with regard to changes in temperature or other parasitic environmental factors), noise, their linearity over their measurement range, etc. Averaging the measurements makes it possible to reduce the effect of these errors / uncertainties by compensating for them mutually.The median may, however, be less sensitive to the extreme values ​​measured.

[0062] The azimuth measurements are deduced from the measurements of the magnetic field intensity measured by the magnetometer(s) in two horizontal directions. These measurements may also be affected by the non-uniformity of the Earth's magnetic field, due for example to local specificities (e.g. geological structures) or to temporal variations (e.g. changes due to movements of liquid iron in the Earth's core). Also, according to one embodiment, the processing module 5 advantageously accesses a world magnetic model MMM (or WMM for the English acronym of World Magnetic Model) representing the Earth's magnetic field. The MMM is a standard model used to represent the Earth's magnetic field. It is updated regularly to take into account the slow, but constant changes in the Earth's magnetic field.This model provides estimates of the magnetic field and its components for different regions of the Earth, at different altitudes and different temporary periods. The processing module 5 can thus apply corrections to the magnetometer measurements on the basis of the information obtained from the MMM to calculate corrected measurements taking into account local and temporary variations in the Earth's magnetic field, as predicted by the MMM. These corrected measurements are then used to determine the equatorial celestial coordinates of the observation zone ZO. The data from the MMM model can, for example, be downloaded and stored in a memory area of ​​the terminal 3 accessible to the processing module 5 or be accessible from a remote computer server to which said terminal 3 is connected.

[0063] According to one embodiment, the processing module 5 calculates the average or the median of the horizontal coordinates measured by all of the sensors 20.

[0064] The number of magnetometers and / or sensor combinations (in the case where each combination comprises a single magnetometer) is between 1 and 10, this number being advantageously determined by the following formula:

[0065] N =c * (p * Z)2

[0066] Where: “N” is the number of magnetometers and / or sensor combinations, N being an integer greater than or equal to 1, preferably between 2 and 10, “c” is a constant, “p” is the precision of the magnetometer(s) used and “Z” is the zoom factor of binocular 1.

[0067] This determination method makes it possible to have an excellent compromise between measurement accuracy and number of sensors (and therefore cost). It is also possible to select very quickly and very easily an appropriate number of magnetometers and / or combinations of sensors 20 depending on the desired level of accuracy and the specifications of the binoculars 1, in particular its zoom factor.

[0068] The equatorial celestial coordinate system uses the measurements of right ascension and declination. Right ascension is measured in hours, minutes, and seconds from the vernal point. Declination is measured in degrees, minutes, and seconds north or south of the celestial equator.

[0069] The conversion of horizontal celestial coordinates (azimuth and altitude) into equatorial celestial coordinates (right ascension and declination) requires knowledge of the precise location of the observer on Earth and the precise date and time of the observation. The data provided by the geolocation module 4 are therefore also used by the processing module 5.

[0070] According to one embodiment, the conversion is carried out by the processing module 5 by executing the code instructions of a dedicated computer program such as SkyCoord® (class of the Astropy® library), NOVAS® (Naval Observatory Vector Astrometry Software), Coordinate Converter®.

[0071] Advantageously, the processing module 5 takes the average or the median of the real-time measurements of the combination(s) of sensors 20 to determine the equatorial celestial coordinates of the observation zone ZO. For the purposes of the invention, the term "real time" means a calculation frequency of between one and five times the acquisition frequency of the sensors 20. This provides real-time equatorial celestial coordinates of the observation zone ZO, making the location very precise and dynamic.

[0072] The device further comprises a database of celestial objects with which equatorial celestial coordinates are associated. These equatorial celestial coordinates can be fixed or dynamic to take into account the temporal parameters for moving objects (e.g. comets, satellites, etc.)• According to a preferred embodiment, this database is integrated into a memory area of ​​the terminal 3. The database can also be installed in a remote computer server to which the terminal 3 is connected. In any event, the database is accessible from the terminal 3, by launching a dedicated computer application previously downloaded into said terminal or accessible from a website. This database can be regularly updated.

[0073] A user interface makes it possible to select a celestial object from this database. In FIGS. 2A and 2B, the user interface corresponds to a touch screen 30 of the terminal 3. The observer / user can, for example, search for a specific celestial object or navigate through a list of celestial objects C1-C6, and make a selection by touching the corresponding object on the touch screen. In the example of [Fig. 2A], a list of constellations referenced C1 to C6 is displayed, appearing in the form of selectable pictograms.

[0074] By selecting one of these constellations, for example the constellation of Taurus C2, the observer / user advantageously has access to information relating to this celestial object (for example its history and / or its characteristics). In [Fig.2B], this information is displayed in a frame or window 31 of the screen 30.

[0075] The device further comprises a comparison module 6 configured to compare the equatorial celestial coordinates of the observation zone ZO determined by the processing module with the celestial coordinates associated with the selected celestial object C2. The comparison module can then calculate the difference between said coordinates. The comparison may in particular involve the subtraction of the coordinates to obtain this difference.

[0076] According to one embodiment, the comparison module 6 is in the form of a calculator or a computer program executed by the processing module. The comparison module 6 is advantageously integrated into the terminal 3, but can be integrated into the housing 2.

[0077] The device also comprises a guidance module 7 generating a guidance signal of which at least one characteristic is a function of the difference calculated by the comparison module 6.

[0078] The guidance module 7 is integrated into the terminal 3, into the binoculars 1 or into the housing 2. According to one embodiment, the guidance module 7 is controlled by the processing module 5. The guidance module 7 may for example consist of a computer program executed by the processing module 5. The guidance signal generated is preferably an audible signal (e.g.: beeps, siren, melody) and / or a visual signal (e.g.: flashing screen or flashing LED, animated icon, color change) and / or a vibratory signal (e.g.: the terminal 3 or the housing 2 vibrates).

[0079] A multimodal guidance signal combining several signaling modes and exploiting different sensory modalities (vision, hearing, touch) makes it possible to maximize the probability that an observer / user detects, recognizes and responds to said signal, whatever the conditions and the observation environment.

[0080] The variable characteristic(s) of the guidance signal may in particular be its frequency and / or its amplitude and / or its intensity and / or its tone and / or its rhythm. For example, the greater the difference calculated by the comparison module 6, the lower the sound guidance signal will be. Conversely, the closer the calculated difference is to zero, the higher the sound guidance signal will be. According to another example, the vibration of the vibratory guidance signal intensifies when the difference calculated by the comparison module 6 decreases. More generally, at least one characteristic of the guidance signal is amplified when the difference calculated by the comparison module 6 decreases. When the calculated difference is zero or almost zero or, more generally, less than or equal to a predetermined threshold value (hereinafter referred to as the “successful localization threshold value”), the guidance signal is then optimal.

[0081] In [Fig.2B], the guidance signal appears in a frame or window 32 of the screen 30. Another frame or window 33 may display a direction in which to move the binoculars 1 to reach the area where the celestial object C2 is located. This indication may also be vocal. All of this information constitutes the guidance signal.

[0082] The observer / user must thus move the binoculars 1 until the difference calculated by the comparison module 6 reaches the threshold value for successful location and the optimal guidance signal indicates the precise location of the area where the celestial object C2 is located. The invention therefore makes it possible to provide a clear indication of the successful detection of the area of ​​the celestial object C2, which increases the speed, efficiency and accuracy of the observation process. The observation of celestial objects thus becomes accessible to a large number of people, in particular to observers / users who do not have in-depth knowledge or experience in astronomy.

[0083] According to one embodiment, the guidance module 7 is configured to generate the guidance signal only if the difference calculated by the comparison module is less than or equal to a predetermined threshold value (hereinafter referred to as “guidance trigger threshold value”). The guidance trigger threshold value is greater than the successful location threshold value. The guidance signal is thus generated only if the observed area ZO is not too far from the object of interest C2. The observer / user is thus warned only if the object of interest C2 is in the field binocular 1's vision or close to it, which makes the search process more fun.

[0084] Thus, taking the example of [Fig. 1], the observer / user searches for the constellation of Taurus C2. He initially points the binoculars towards an observation zone ZO not containing this constellation. The initial observation zone ZO being, however, relatively close to the constellation sought, the guidance signal is generated. The user interface can indicate in which direction to move the binoculars 1 (indication 33 in [Fig.2B]). When the observation zone contains the constellation (referenced ZO'), the guidance signal becomes optimal. The observer / user can now locate the constellation C2 through his binoculars 1.

[0085] In practical situations, once the observer / user has successfully located the celestial object C2, the persistence of the guidance signal may prove inconvenient not only for himself, but also for other observers located nearby. To overcome this inconvenience, the guidance module 7 is advantageously configured to interrupt the generation of the guidance signal when the difference calculated by the comparison module remains less than or equal to a predetermined threshold value, for a predetermined duration, for example between 5 seconds and 30 seconds. This intelligent control of the guidance module 7 not only improves the experience of the observer / user, but also minimizes disturbances for other observers present in his immediate environment.

[0086] Alternatively or additionally, the device may comprise a button that can be manually operated by the observer / user to interrupt the generation of the guidance signal. This button may, for example, be integrated into the binoculars 1 or on the housing 2, or be accessible from the terminal 3.

[0087] In certain cases, even when the observer / user observes the area of ​​interest ZO', the precise location of the object of interest C2 may prove complex for an amateur. It is thus advantageous to equip the binoculars 1 with a means for displaying information concerning the object of interest C2. This information, considered as the aforementioned guidance signals, is generated and / or selected by the processing module 5 and may for example be in the form of one or more arrows, symbols or signaling elements indicating the location of the celestial object C2 and / or a geometric figure schematizing said object. The processing module 5 can control the display of this information in response to the selection of the celestial object C2 or in response to the generation of the guidance signal and / or as soon as the binoculars 1 are oriented towards the area of ​​interest ZO'.

[0088] According to one embodiment, this display means is a screen located outside the binoculars 1, which may for example consist of the screen 30 of the terminal 3. An image of the area of ​​interest ZO', as viewable from the eyepieces of the binoculars 1, and in which the aforementioned information highlights the object of interest C2, is then displayed on this screen. By consulting this display, the observer / user can more easily locate the object of interest C2. This solution, however, requires looking away from the eyepieces to view the screen 30.

[0089] According to an alternative embodiment illustrated in [Fig.5] and making it possible to improve the user experience, the display means 8 is integrated into the binoculars 1, and more particularly installed so as to display the information in an image plane Pi of the optical system. The image plane Pi is located at the place where the virtual image of the observed area is formed by the objective 100 (front lens) and before it is enlarged by the eyepiece 101. The information displayed in the image plane Pi thus allows the observer / user to consult it while keeping his eyes at the level of the eyepieces, without looking away.

[0090] According to one embodiment, this display means 8 is in the form of a screen, for example an OLED or LCD screen, installed in the image plane Pi so as to only partially obstruct the image observed through the eyepiece 101.

[0091] According to another embodiment, this display means 8 is in the form of a semi-reflective screen, for example a liquid crystal film or a transparent OLED or LCD screen, installed in the image plane Pi so that the displayed information is superimposed on the real image observed through the eyepiece 101. This solution makes it possible in particular to display the image of the object of interest C2 at the same scale as the real image of the celestial objects present in the observation zone ZO, ZO'. The observer / user thus only has to superimpose the two images to identify the object of interest C2.

[0092] According to another variant embodiment illustrated in [Fig.6], according to one embodiment, the display means 8 is in the form of a screen, for example an OLED or LCD screen, projecting a digital image of the information, towards a semi-reflecting plate 80. This plate 80 is arranged in the optical system so as to transmit towards the eyepiece 101: a first subset of light rays coming from the observed area (natural image); and a second subset of light rays projected by the screen 8 (digital image). These rays then combine at the eyepiece 101 to restore the natural image of the observed area combined with the digital image of the information. A lens 81 is advantageously provided between the screen 8 and the semi-reflecting plate 80 to orient and / or converge the light rays projected towards said plate.

[0093] [Fig.3] illustrates an example of interaction of different aforementioned elements of the device and presents different stages of the method of assisting in the location of celestial objects: • Step El: from interface 30, the observer / user selects a celestial object from the database. • Step E2: the equatorial celestial coordinates of the selected celestial object are transmitted to the comparison module 6. If the comparison module is integrated into the box 2, this transmission can be carried out via a short-range communication line, for example of the Bluetooth® or Wifi® type, established between said box and the terminal 3. The box 2 in this case integrates the computing resources making it possible to ensure this communication. • Step E3: the horizontal coordinates measured by the sensors 20 are transmitted to the processing module 5. If the processing module 5 is integrated into the terminal 3, this transmission can be carried out via a short-range communication line, for example of the Bluetooth® or Wifi® type, established between the box 2 and said terminal. In this case, the box 2 integrates the computing resources making it possible to ensure this communication. • Step E4: the position, date and time data determined by the geolocation module 4 are transmitted to the processing module 5. If the geolocation module 4 and the processing module 5 are not installed in the same equipment (box 2 or terminal 3), this transmission can be carried out via a short-range communication line, as described previously. • Step E5: the processing module 5 determines the equatorial celestial coordinates of the celestial observation zone ZO using the measurements from the sensors 20 and the data from the geolocation module 4. • Step E6: the equatorial celestial coordinates determined by the processing module 5 are transmitted to the comparison module 6. If the processing module 5 and the comparison module 6 are not installed in the same equipment (box 2 or terminal 3), this transmission can be carried out via a short-range communication line, as described previously. • Step E7: the comparison module 6 compares the equatorial celestial coordinates transmitted by the processing module 5 with the celestial coordinates transmitted in step E2. • Step E8: the guidance module 7 generates the guidance signal based on the result of the comparison in step E7.

[0094] According to one embodiment, the geolocation module 4, the processing module 5, the comparison module 6 and the guidance module 7 are integrated into the terminal 3. The device thus benefits from the computing resources which are usually natively present in a terminal 3 of the smartphone or tablet type, so that the size, design and costs of the housing 2 are limited. technology offered by the invention is thus accessible to a greater number of users. The sensors 20 can also be installed in the terminal 3. In this case, the terminal 3 is preferably fixed on binoculars 1 so that the horizontal coordinates of the zone ZO observed through said binoculars are reliable and precise.

[0095] According to an alternative embodiment, the binocular 1 is equipped with a part of the modules, the other part of the modules being integrated into the terminal 3.

[0096] In Figures 4A and 4B, the sensors 20 are housed in a housing 2 designed to be mounted on the binoculars 1. The housing 2 has, for example, a length of between 10 mm and 60 mm, a width of between 5 mm and 20 mm and a height of between 2 mm and 5 mm. These dimensions make it possible to guarantee a good compromise between compactness that does not bother the observer / user and harmonious integration.

[0097] The housing 2 is advantageously waterproof to provide protection against the weather and rigid to withstand potential impacts. It can be made of plastic, steel, aluminum, composite, or other similar material and be obtained by molding, machining, assembly, etc.

[0098] Inside the housing 2, each sensor 20 can be installed in an individual arrangement or fixed on a common support, in particular on a common electronic card.

[0099] The housing 2 is preferably adapted to be fixed in a stable manner on the binoculars 1, thus avoiding any unwanted movement of said housing during observation, while being easily adaptable to different models of binoculars.

[0100] An external face of the housing 2 is preferably provided with a pad 21. This pad can be glued or screwed onto the external face of the housing 2. It is made of a soft and / or flexible material, for example a rubber-type elastomer, allowing it to conform to various shapes and / or finishes of the binoculars to ensure optimal fixing.

[0101] In the embodiment of [Fig.4A], the pad 21 is designed to be detachably attached to the binoculars 1. The face of the pad 21 intended to be attached to the binoculars 1 may in particular be provided with an adhesive coating 210 allowing it to be removed without leaving any residue, for example a silicone-based glue, a hot-melt adhesive or a double-sided adhesive, with a peelable protective strip. According to an alternative embodiment, the pad 21 is designed to be permanently attached to the binoculars 1, for example by means of a cyanoacrylate or epoxy type glue.

[0102] In the embodiment of [Fig.4B], the housing 2 is equipped with a fastener or strap 22 provided with an adjustable fastening means 220, for example of the Velcro® type, allowing rapid adjustment. The strap 22 allows modular fixing and de- easy staining.

[0103] The attachment or strap 22 is preferably elastic to allow an attachment adaptable to different models of binoculars. The elastic strap 22, once stretched around the binocular 1, ensures a stable attachment of the housing 2. An advantage of this solution is its ability to adapt to different sizes and shapes of binoculars.

[0104] In this embodiment with strap 22, the buffer 21 is not necessary although it makes it possible to improve stability and adaptability.

[0105] Other detachable attachment methods are also conceivable. For example, a clip or rail system may be integrated on the housing 2, allowing it to be clipped or mounted on a complementary support of the binoculars 1. If the binoculars 1 have metal components or a dedicated magnetic support, the housing 2 may integrate magnets. The housing 2 may also include mini-suction cups. Threaded inserts may also be added to the binoculars 1, the housing then being directly screwed onto said inserts.

[0106] According to another embodiment, the sensors 20 are integrated into the structure of the binoculars 1, for example from the design thereof.

[0107] According to one embodiment, the geolocation module 4, the processing module 5, the comparison module 6 and the guidance module 7 are also integrated into the housing 2.

[0108] According to yet another aspect, the invention relates to a computer program product comprising code instructions for executing at least the steps for: determining the position, date and time of the observation; transforming the horizontal coordinates into equatorial celestial coordinates; comparing the equatorial celestial coordinates thus calculated with the celestial coordinates associated with the selected celestial object; calculating the difference between said coordinates; and generating the guidance signal, when said program is executed by a processing module, in particular the processing module of the terminal 3. The program thus provides a software implementation of the method, which can be executed on a variety of devices, in particular a smartphone, with updates which can be simple.

[0109] Another functionality makes it possible not to guide the observer / user towards an object of interest, but to indicate one or more objects of interest in the celestial zone ZO that he is currently observing. For example, the observer / user observes a celestial zone ZO, sees an object, and wants to identify it. The different steps allowing this identification are advantageously the following: • Step El': the observer / user selects this functionality, for example by pressing a dedicated button integrated into the binoculars 1 or on the housing 2, or accessible from the terminal 3. • Step E2': processing module 5 determines the celestial coordinates equatorial planes of the observation zone using the measurements of the sensors 20 and the data of the geolocation module 4 (step E5 mentioned above). • Step E3': the processing module 5 automatically selects from the database the celestial object(s) whose equatorial celestial coordinates correspond to those measured. • Step E4': the processing module 5 generates and / or selects information on the object(s) of interest and controls their display on the aforementioned display means 30, 8.

[0110] The arrangement of the various elements and / or means and / or steps of the invention, in the embodiments described above, should not be understood as requiring such an arrangement in all implementations. In any event, it will be understood that various modifications may be made to these elements and / or means and / or steps, without departing from the spirit and scope of the invention.

[0111] In particular, according to an additional functionality, the device can be used in the same way, but for the location of terrestrial landmarks such as mountain peaks, valleys, villages, rivers, lakes, forests or other natural or artificial landmarks observable with binoculars. In this case, the geographical coordinates (latitude, longitude and altitude) of the terrestrial landmarks are used. The database associates reference terrestrial landmarks with their geographical coordinates. The method can be as follows: the observer / user selects a terrestrial landmark from the database; the processing module 5 determines the geographical coordinates of the observer / user and of the terrestrial observation area using the measurements of the sensors 20 and the data of the geolocation module 4.The comparison module 6 calculates a difference between the geographical coordinates determined by the processing module 5 and the geographical coordinates of the selected landmark; the guidance module 7 generates a guidance signal of which at least one characteristic is a function of the difference calculated by the comparison module 6. By knowing the geographical coordinates of the observer / user and the geographical coordinates of the landmark, the processing module 5 can in particular deduce and indicate the direction in which the binoculars must be inclined (alt / az coordinates) to aim at the selected landmark.

[0112] Furthermore, one or more features disclosed only in one embodiment may be combined with one or more other features disclosed only in another embodiment. Similarly, one or more features disclosed only in one embodiment may be generalized to other embodiments, even if that or those features are described only in combination with other features.

Claims

Claims

1. Device for assisting in the location of celestial objects, comprising: • a pair of binoculars (1) comprising an optical system, said pair of binoculars being equipped with at least one combination of sensors configured to measure horizontal coordinates of a celestial observation zone (ZO), which combination of sensors comprises: at least one magnetometer, one accelerometer and one gyroscope; • a geolocation module (4) for determining position, date and time data of the observation; • a processing module (5) for determining equatorial celestial coordinates of the celestial observation zone (ZO) using the measurements of the combination of sensors (20) and the data of the geolocation module (4); • a database containing equatorial celestial coordinates of selectable celestial objects (C2-C6); • a user interface (30) for selecting a celestial object (C2) from the database;• a comparison module (6) for calculating a difference between the equatorial celestial coordinates determined by the processing module (5) and the celestial coordinates of the selected celestial object (C2); • a guidance module (7) for generating a guidance signal of which at least one characteristic is a function of the difference calculated by the comparison module (6).;

2. Device according to claim 1, wherein the sensor combination (20) comprises at least two magnetometers.

3. Device according to one of the preceding claims, in which the binoculars (1) are equipped with several combinations of sensors (20).

4. Device according to one of claims 2 or 3, in which the measurements of the combination(s) of sensors (20) used to determine the equatorial celestial coordinates of the celestial observation zone (ZO) comprise the average or the median of the measurements of the magnetometers.

5. Device according to one of the preceding claims, in which the processing module (5) is configured to take the average or median of the real-time measurements of the sensor combination (20) to determine the equatorial celestial coordinates of the celestial observation zone (ZO).

6. Device according to one of the preceding claims, wherein the processing module (5) is configured to: a) receive measurements from the magnetometer; b) access a global magnetic model (MMM) representing the Earth's magnetic field; c) apply corrections to the magnetometer measurements based on the information obtained from the MMM to calculate corrected measurements; d) use the corrected measurements to determine the equatorial celestial coordinates of the celestial observation zone (ZO).

7. Device according to one of the preceding claims, wherein the binoculars (1) comprise a display means (30, 8), the processing module (5) being configured to generate and / or select information to be displayed on said display means.

8. A device according to claim 7, wherein the display means (8) is installed so as to display the information in an image plane (Pi) of the optical system of the binoculars (1).

9. Device according to claim 8, in which the display means (8) is a screen installed in the image plane (Pi) so as to only partially obstruct the image of the celestial observation zone (ZO) observed through an eyepiece (101) of the optical system.

10. Device according to claim 8, wherein the display means (8) is a semi-reflective screen installed in the image plane (Pi) so that the displayed information is superimposed on the image of the celestial observation zone (ZO) observed through an eyepiece (101) of the optical system.

11. Device according to claim 8, in which the display means (8) is in the form of a screen projecting a digital image of the information towards a semi-reflecting plate (80), which plate is arranged in the optical system in such a way that said digital image is superimposed on the image of the celestial observation zone (ZO) observed through an eyepiece (101) of said optical system.

12. Device according to one of the preceding claims, wherein the guidance module (7) is configured to generate the guidance signal if the calculated difference is less than or equal to a first predetermined threshold value.

13. Device according to one of the preceding claims, in which the guidance module (7) is configured to cease generating the guidance signal when the difference calculated by the comparison module (6) remains less than or equal to a second predetermined threshold value for a predetermined duration.

14. Device according to one of the preceding claims, in which the sensors (20) are housed in a housing (2) designed to be mounted on the binoculars (1).

15. Device according to one of claims 1 to 14, in which the geolocation module (4), the processing module (5), the comparison module (6) and the guidance module (7) are integrated into a smartphone or a tablet (3).

16. Device according to one of claims 1 to 14, in which the sensors (20), the geolocation module (4), the processing module (5), the comparison module (6) and the guidance module (7) are integrated into the binoculars (1).

17. Device according to one of the preceding claims, in which the guidance module (7) is configured to generate an audible signal and / or a visual signal and / or a vibratory signal of which at least one characteristic is amplified when the difference calculated by the comparison module (6) decreases.

18. A method for assisting in the location of celestial objects, comprising the following steps: • a) equipping a binocular (1) comprising an optical system, with at least one sensor combination (20) configured to measure horizontal coordinates of a celestial observation zone (ZO), which sensor combination comprises: at least one magnetometer, one accelerometer and one gyroscope; • b) determining position, date and time data of the observation; • c) determining equatorial celestial coordinates of the celestial observation zone (ZO) using the measurements of the sensor combination and the data determined in step b); • d) selecting a celestial object (C2) from a database containing selectable celestial objects (C2-C6) associated with equatorial celestial coordinates; • e) calculating a difference between the equatorial celestial coordinates determined in step c) and the celestial coordinates of the selected celestial object (C2); • f) generating a guidance signal of which at least one characteristic is a function of the difference calculated in step e).

19. Method according to claim 18, in which: • step a) consists of equipping the binoculars with several combinations of sensors and / or a combination of sensors comprising at least two magnetometers, • step c) is carried out using the average or the median of the measurements of the magnetometers.

20. Method according to one of claims 18 or 19, further comprising the following steps: • automatically selecting from the database one or more celestial objects whose equatorial celestial coordinates correspond to those determined in step c), • generating and / or selecting information on said selected celestial object(s), • displaying said information on a display means.

21. Method according to one of claims 18 to 20, further comprising the following steps: • c') determining geographic coordinates of a terrestrial area using the measurements of the sensor combination and the data determined in step b); • d') selecting a terrestrial landmark from a database containing selectable terrestrial landmarks associated with geographic coordinates; • e') calculating a difference between the geographic coordinates determined in step c') and the geographic coordinates of the selected terrestrial landmark; • f') generating a guidance signal of which at least one charac-

22. ristic is a function of the difference calculated in step e'). Computer program comprising code instructions for executing steps b), c), e) and f) of the method according to claim 18, when said instructions are executed by a processing module (5).

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