# US 2013/0278757 A1 · Space survey system for monitoring near-earth space

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- Number: US 2013/0278757 A1
- Document ID: US20130278757A1
- Status: Published application
- Kind: A1
- Application number: 13/809,751
- Filed: 2011-07-08
- Published: 2013-10-24
- Earliest claimed: 2010-07-12
- Assignees: Astrium GmbH
- Inventors: Bernard Martin; Francois Le Berre; Damien Caillau; Louis Leveque
- Web page: https://patentgrep.com/patent/US20130278757A1

## CPC

- H04N 7/18: Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- B64G 3/00: Observing or tracking cosmonautic vehicles
- G02B 17/0636: {off-axis or unobscured systems in which all of the mirrors share a common axis of rotational symmetry}
- G02B 23/06: having a focussing action, e.g. parabolic mirror
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- B64G: COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A space survey system includes networked optical surveying systems designed to scan areas of earth orbit, in particular the LEO layer, arranged in a grid on the surface of a planet and further includes means designed to acquire images of objects traversing the areas scanned by the optical systems and calculation means designed to realize a measurement of the position time series of objects crossing the scanned areas by short integration over a fixed field.

## Claims

### Claim 1

A space survey system comprising:
networked optical surveying systems designed to scan areas of earth orbit arranged in a grid on the surface of a planet;
means designed to acquire images of objects traversing the areas scanned by the optical systems; and
calculation means designed to realize a measurement of the time series of positions of objects crossing the scanned areas by short integration over a fixed field;
the optical systems being designed to scan the observation area 4 to 6 times faster than the transit velocity of the objects to be detected.

### Claim 2 (depends on 1)

The space survey system according to claim 1, wherein the calculator is designed to realize the measurement and to return, in relation to the stars in the field of view, a minimum of 3 measurement points for each object crossing the scanned area.

### Claim 3 (depends on 1)

The space survey system according to claim 1, comprising a computer means for processing the images coming from the optical systems to extract the date-stamped positions of the objects going across the field.

### Claim 4 (depends on 1)

The space survey system according to claim 1, wherein the optical systems comprise telescopes arranged on the surface of the planet according to a configuration designed to provide an effective daily cycle close to 24 hours and a selected revisit rate for the monitored LEO area.

### Claim 5 (depends on 4)

The space survey system according to claim 4, wherein each optical system is positioned and controlled according to specific observation conditions based on its geographical location designed to ensure optimum illumination of the objects to be detected.

### Claim 6 (depends on 5)

The space survey system according to claim 5, wherein the optical systems are wide-field optical systems designed to scan an area of sky at least 10 to 40° by 10 to 60°.

### Claim 7 (depends on 1)

The space survey system according to claim 1 comprising, associated to each optical system a dedicated tracking device with a conventional field designed to acquire, on the basis of the designation realized by the survey system, more numerous and precise position measurements of objects designed to achieve the required precision on the determination of the orbital parameters of said objects in order to transform the survey system into a system designed to define and track a precise trajectory of previously detected objects.

### Claim 8 (depends on 1)

The space survey system according to claim 1, wherein the basic optical systems of the network are designed to traverse the area to be observed at a frequency 4 times greater than the minimum transit time of the objects in the targeted population in the scanned area of the sky.

### Claim 9 (depends on 1)

The space survey system according to claim 1, wherein the exposure time ranges from several milliseconds to several hundred milliseconds.

### Claim 10

The space survey and tracking system comprising:
dedicated tracking systems; and
means of connecting said optical survey systems and said dedicated tracking systems designed to transmit designations of objects coming from the optical survey systems to the dedicated tracking systems; the orbits of said objects then being determined precisely by the dedicated tracking systems using said designations as input data.