37 results about "Stars" patented technology

The subject invention provides a system for identifying images in the nighttime sky for the purpose of, for example, honoring and / or memorializing people, places, and events. In accordance with the subject invention, the images are defined, at least in part, by stars in the nighttime sky. In a preferred embodiment, at least some of the stars that serve to define the image are visible with the naked eye.

The invention discloses a method for fast star map recognition of the whole celestial sphere by a star sensor, which includes constructing a navigation feature library of the shape factor and angular distance value of the navigation triangle; according to the number of observed stars in the field of view of the star sensor, select the best The four observation stars form two target observation triangles; calculate the shape factor and angular distance value of the two target observation triangles, match them with the navigation feature library, and obtain the navigation triangle to be matched; according to the Navigate the triangle information, generate a reference star map of a local sky area, and perform star point matching on the reference star map and the current observation star map in four steps. It can reduce the requirement on the storage space of the navigation feature library. In the process of matching and recognition, the "unique" navigation triangle can be quickly found according to the characteristics of the observation triangle, which solves the problem of redundant navigation triangles in the traditional triangle method. The matching recognition time is short, the recognition success rate is high, and the robustness is good.

The invention relates to a total station and a star image star centroid extraction method thereof, By calculating the horizontal coordinates of the stars relative to the stations, the azimuth and altitude of the star, Based on the inverse transformation model of total station pixel coordinates and dial coordinates, Predicting the Initial Imaging Position of a Star, At that initial image position,Setting the range of star image processing and calculating star point centroid coordinates in this range, the star image of total station can be processed locally and effectively, avoiding the whole image processing, greatly shortening the time of star point centroid extraction, improving the efficiency of star point centroid extraction, and providing technical support for rapid astronomical measurement.

The invention relates to a total station and its star map identification method; the total station continuously takes pictures of the stars, obtains the trajectory of the star on the image plane, and uses a polynomial to fit the trajectory; according to the fitted trajectory model, extrapolates At the time of setting the image point coordinates of the stars, and using the image coordinates of the total station and the coordinate conversion model of the dial to obtain the observation horizontal angle and altitude angle of at least three stars; calculate the angular distance information between any two stars, and Taking the angular distance information as the matching condition, set a reasonable threshold, complete the matching, and identify the stars in the star map. The invention can realize the star map recognition without the total station instrument of the general position of the survey station, so that the astronomical survey operators can recognize the star map without professional knowledge of star recognition.

The invention discloses a space debris detection method based on stellar retrieval. The method comprises: receiving images and estimating image backgrounds; performing full-frame scanning on the images according to the estimation results of the image backgrounds, and calculating two-dimensional plane coordinates of all the stars on the images; acquiring three-dimensional vectors of inertial spacecorresponding to all stars by combining the actually measured coordinates of the two-dimensional planes of all stars on the images by means of astronomical positioning and acquiring two-dimensional tangent plane theoretical coordinates of all fixed stars; identifying and rejecting background fixed stars in all images; and acquiring track features of the remaining stars, and detecting all space debris in the images. Therefore, the fixed stars in the single-frame images can be identified and rejected based on preset fixed star identification conditions; multi-frame images can be used flexibly; and the space debris of the image is detected, so that the detection false alarm caused by factors like the bright fixed star is reduced; and the detection success rate of the weak space debris is improved.

The present invention provides a planetary gear for holding objects to be ground. The planetary wheel for holding objects to be ground is a planetary wheel for holding objects to be ground for a double-sided grinding machine, and is used to obtain precise upper and lower surface roughness, and Grinding object with excellent parallelism and excellent flatness. The problem is solved by using the following planet wheel for holding the object to be ground, which has one or more holding holes for holding the object to be ground. A plurality of small holes are perforated on the base material of the planetary wheel on the inner side of the concentric circle, and a plurality of small holes having a diameter larger than the aforementioned small holes are perforated on the base material of the planetary wheel on the outer side than the aforementioned imaginary concentric circle. The concentric circles have the same center as the holding hole for holding the object to be ground, and are drawn with a radius larger than that of the holding hole.

The invention discloses a method, a device and a telescope for quickly identifying a star. The identification method includes acquiring information on a star to be identified, and the information on the star includes a target angle coordinate; and adjusting the angle coordinate of a recognition device according to the target angle coordinate; Use the recognition device to capture the first starry sky image at the current angle coordinates; search the corresponding starry sky database to obtain the second starry sky image according to the target angle coordinates and the current field of view angle of the recognition device; compare the first starry sky image with the second starry sky image , identifying the star to be identified in the first starry sky image according to the comparison result. The telescope of the present invention does not need to be calibrated after starting up, and uses the starry sky database to simulate the current telescope, and compares the actual starry sky image with the simulated starry sky image to realize fast star searching, and compared with the composition star search method, the star recognition speed of the present invention and The accuracy rate is greatly improved.

The invention discloses a method and system for fast all-sky-domain star map recognition robust to noise. The star map recognition method comprises the following steps: S1, selecting a main star to be recognized in the star map; S2, constructing a candidate set of nearby stars; S3, obtain the preprocessed star map; S4, obtain the distance mask pattern of the preprocessed star map; S5, calculate the initial similarity, and filter out candidate templates for matching; S6, calculate the comprehensive similarity of the candidate templates; S7, output final recognition result. Performing star map identification according to the method of the present invention can alleviate the problem of transforming a large number of star points in the field of view to outside the field of view after decentralization in the traditional method, and increase the number of available stars; The problem of subsequent matching errors; at the same time, the robustness is very high in the presence of noise such as lack of stars or pseudo-stars. In addition, the present invention adopts non-iterative verification and does not need to introduce additional star point identification for confirmation, so it is more rapid and effective.

The invention discloses a star finder manufacturing method which comprises the steps of: calculating the average position of each common star in the year; projecting the average position of each common star on two bottom plates respectively by adopting positive-axis azimuthal equidistant projection, and marking a right ascension graduated ring, an equator image, an ecliptic image and a mean sun graduated ring on southern and northern bottom plates; converting horizontal coordinates of each node of a horizontal coordinate net into equatorial coordinates, and protecting the coordinates on a transparent plate to be taken as a transparent coordinate net piece; and marking a minus 6-degree altitude parallel ring and a local mean time graduated ring on the transparent coordinate net piece. By adopting the manufacturing method of a star finder provided by the invention, the manufactured star finder can be used for selecting and recognizing stars by a minus 6-degree altitude line method, a vernal equinox local time angle method and a local mean time method, so that a user who masters different star selecting and recognizing methods can conveniently use the star finder, and more star selecting and recognizing methods can be achieved compared with the star finder manufactured by the traditional method.

The invention discloses a method for increasing the output frequency of a star sensor based on gyroscope assistance. The method comprises the following steps: (1) the star sensor outputs a current frame star map, and extracts star points in the current frame star map position; (2) predict the position of the star point in the next moment star map according to the angular velocity information output by the gyroscope in the current frame star map; (3) calculate the attitude information of the carrier where it is located by the star sensor and output. The invention predicts the position of the star point in the star map through the angular velocity information output by the gyroscope, and improves the data update frequency of the star sensor.

The invention discloses a star map identification method based on radial and dynamic circumferential modes and ensures a relatively high correct identification rate of a star map in the presence of position noise and brightness noise and in the case of a small number of star points in a field of view. The method mainly comprises steps of 1, establishing the radial and dynamic circumferential modescorresponding to a navigation star; 2, creating a navigational star database of a plurality of navigational stars; 3, establishing a radial mode and a dynamic circumferential mode corresponding to the observation star; 4, performing initial identification; and 5, performing accurate identification.

The invention discloses a method for screening out false stars of a star sensor based on angular distance screening. The steps are: (1) recording all star points in the first frame star map as initial star points; (2) starting from the second frame , use the star tracking method to establish the corresponding relationship between each star point and the initial star point; (3) compare the angular distance between each frame and the initial frame, screen the angular distance according to the angular distance change, and update the angular distance screening matrix; (4) ) Use the star pairs corresponding to the screened angular distances to vote for each star point, and filter out the star points with too low number of votes; (5) Output the filtered star points for each frame and send them to the subsequent star map recognition module. The present invention has the following advantages: (1) the success rate of convergence is high, within 600 false stars, the success rate of convergence is above 98%; (2) the convergence speed is fast, and it only needs no more than 10 frames of star maps on average to screen out all false stars. False stars; (3) The ability to adapt to the number of false stars is strong, and all false stars can be screened out from the star map of up to 700 false stars; (4) The screening of false stars does not depend on the shape information of star points.