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1. WO2020117530 - STAR TRACKER FOR MULTIPLE-MODE DETECTION AND TRACKING OF DIM TARGETS

Publication Number WO/2020/117530
Publication Date 11.06.2020
International Application No. PCT/US2019/063055
International Filing Date 25.11.2019
IPC
G06T 5/00 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
5Image enhancement or restoration
G06T 5/50 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
5Image enhancement or restoration
50by the use of more than one image, e.g. averaging, subtraction
G01S 3/786 2006.01
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
3Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
78using electromagnetic waves other than radio waves
782Systems for determining direction or deviation from predetermined direction
785using adjustment of orientation of directivity characteristics of a detector or detector system to give a desired condition of signal derived from that detector or detector system
786the desired condition being maintained automatically
B64G 1/36 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
64AIRCRAFT; AVIATION; COSMONAUTICS
GCOSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
1Cosmonautic vehicles
22Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
24Guiding or controlling apparatus, e.g. for attitude control
36using sensors, e.g. sun-sensors, horizon sensors
G01C 21/02 2006.01
GPHYSICS
01MEASURING; TESTING
CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
21Navigation; Navigational instruments not provided for in groups G01C1/-G01C19/104
02by astronomical means
CPC
B64G 1/244
BPERFORMING OPERATIONS; TRANSPORTING
64AIRCRAFT; AVIATION; COSMONAUTICS
GCOSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
1Cosmonautic vehicles
22Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
24Guiding or controlling apparatus, e.g. for attitude control
244Attitude control
B64G 1/361
BPERFORMING OPERATIONS; TRANSPORTING
64AIRCRAFT; AVIATION; COSMONAUTICS
GCOSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
1Cosmonautic vehicles
22Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
24Guiding or controlling apparatus, e.g. for attitude control
36using sensors, e.g. sun-sensors, horizon sensors
361using star sensors
G01C 21/025
GPHYSICS
01MEASURING; TESTING
CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
21Navigation; Navigational instruments not provided for in preceding groups G01C1/00-G01C19/00
02by astronomical means
025with the use of startrackers
G01S 3/7803
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
3Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
78using electromagnetic waves other than radio waves
7803Means for monitoring or calibrating
G01S 3/781
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
3Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
78using electromagnetic waves other than radio waves
781Details
G01S 3/7867
GPHYSICS
01MEASURING; TESTING
SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
3Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
78using electromagnetic waves other than radio waves
782Systems for determining direction or deviation from predetermined direction
785using adjustment of orientation of directivity characteristics of a detector or detector system to give a desired condition of signal derived from that detector or detector system
786the desired condition being maintained automatically ; , i.e. tracking systems;
7867Star trackers
Applicants
  • BALL AEROSPACE & TECHNOLOGIES CORP. [US]/[US]
Inventors
  • TCHILIAN, Emil
Agents
  • KNEPPER, Bradley M.
Priority Data
62/774,71903.12.2018US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) STAR TRACKER FOR MULTIPLE-MODE DETECTION AND TRACKING OF DIM TARGETS
(FR) SUIVEUR STELLAIRE PERMETTANT LA DÉTECTION ET LE SUIVI MULTIMODE DE CIBLES SOMBRES
Abstract
(EN)
Multiple mode star tracker methods and systems in which attitude information and image information is generated are provided. The multiple mode star tracker includes a detector having a plurality of pixels arranged in a focal plane array. The detector is operated to obtain multiple image frames from within a field of view containing a plurality of stars. For each of the image frames, the attitude of the detector and in turn the attitude of each pixel is determined. Based on the attitude quaternion of the individual pixels within a plurality of frames, image data from the plurality of frames is co-added or stacked to form a composite image. The co-addition of multiple frames of image data enables or facilitates the detection of dim objects by the multiple mode star tracker. Moreover, embodiments of the present disclosure enable the attitude quaternion for individual pixels within individual frames to be determined using the multiple mode star tracker function of the instrument, and without requiring attitude information provided by a separate device, such as a gyroscope.
(FR)
L'invention concerne des procédés et des systèmes de suiveurs stellaires multimodes dans lesquels sont générées des informations d'attitude et des informations d'image. Le suiveur stellaire multimode comprend un détecteur comportant une pluralité de pixels agencés en réseau de plans focaux. Le détecteur sert à obtenir de multiples trames d'image à partir de l'intérieur d'un champ de vision contenant une pluralité d'étoiles. Pour chacune des trames d'image, l'attitude du détecteur et tour à tour l'attitude de chaque pixel sont déterminées. En fonction du quaternion d'attitude des pixels individuels à l'intérieur d'une pluralité de trames, des données d'image provenant de la pluralité de trames sont co-ajoutées ou empilées pour former une image composite. Le co-ajout de multiples trames de données d'image permet ou facilite la détection d'objets sombres par le suiveur stellaire multimode. De plus, des modes de réalisation de la présente invention permettent de déterminer le quaternion d'attitude pour des pixels individuels à l'intérieur de trames individuelles à l'aide de la fonction de suiveur stellaire multimode de l'instrument, sans nécessiter de fourniture d'informations d'attitude par un dispositif séparé, tel qu'un gyroscope.
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