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1. (WO1979000260) CORRELATION FOLLOWER FOR TRACKING AN OBJECT
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000260 International Application No.: PCT/SE1978/000067
Publication Date: 17.05.1979 International Filing Date: 01.11.1978
IPC:
G01S 13/72 (2006.01) ,G01S 3/786 (2006.01)
G PHYSICS
01
MEASURING; TESTING
S
RADIO 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
13
Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
66
Radar-tracking systems; Analogous systems
72
for two-dimensional tracking, e.g. combination of angle and range tracking, track-while-scan radar
G PHYSICS
01
MEASURING; TESTING
S
RADIO 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
3
Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
78
using electromagnetic waves other than radio waves
782
Systems for determining direction or deviation from predetermined direction
785
using 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
786
the desired condition being maintained automatically
Applicants:
Inventors:
Priority Data:
771235202.11.1977SE
Title (EN) CORRELATION FOLLOWER FOR TRACKING AN OBJECT
(FR) SUIVEUR DE CORRELATION POUR PISTER UN OBJET
Abstract:
(EN) A correlation follower comprising an image sensor (1) adjustable sideways and in height with a limited field of view, which is cyclically scanned by the sensor the output signal of which reflects the image content within the field of view and a video correlator (3) for controlling the alignment of the sensor in dependance of the output signal of the image sensor. The video correlator (3) has two addressable memories (12, 14) the one of which is a real time memory (12), i.e. in this memory a section of the field of view is stored for each cycle. The other memory is a reference image memory (14) and is updated with the content or the real time memory (12). During the correlation the contents of the memories are displaced in relation to each other and an error signal, corresponding to the position of displacement for which maximum correlation is achieved, is made to control, through said control circuits, the alignment of the sensor. To make the tracking process insensitive to disturbancies and image elements which appear momentarily in the field of view for each scanning cycle only a part of the positions of the reference image memory (14) are updated by selection the addresses to said positions randomly or according to a predetermined rule of selection. By that the positions which are updated during one cycle in positions are distributed over the entire area of the memory.
(FR) Un suiveur de correlation comprend un senseur d"image (1) reglable sur les cotes et en hauteur avec un champ de vision limite, qui est cycliquement balaye par le senseur dont le signal de sortie reflete l"image contenue dans le champ de vision, et un correlateur video (3) de commande de l"alignement du senseur en fonction du signal de sortie du senseur d"image. Le correlateur video (3) possede deux memoires adressables (12, 14) dont l"une est une memoire en temps reel (12), c"est-a-dire que dans cette memoire une section du champ de vision est stockee pour chaque cycle. L"autre memoire est une memoire d"images de reference (14) et elle est mise a jour avec le contenu de la memoire en temps reel (12). Pendant la phase de correlation les contenus des memoires se deplacent l"un par rapport a l"autre et il se produit un signal d"erreur, correspondant a la position de deplacement pour laquelle la correlation maximum est obtenue, qui commande l"alignement du senseur par l"intermediaire de circuits de commande. Afin de rendre le procede de pistage insensible aux perturbations et aux elements d"images qui apparaissent momentanement dans le champ de vision, pour chaque cycle de balayage une partie seulement des positions de la memoire d"images de reference (14) sont mises a jour en selectionnant les adresses pour ces positions au hasard ou selon une regle de selection predeterminee. Ainsi, les positions mises a jour pendant un cycle sont distribuees sur toute la zone de memoire.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
JPS54500044