Observation space vehicle having a laser-based measurement system

• US 5,367,371 A
• Filed: 01/21/1993
• Issued: 11/22/1994
• Est. Priority Date: 01/21/1992
• Status: Expired due to Fees

• Current Assignee: Aerospatiale Societe Nationale Industrielle
• Original Assignee: Aerospatiale Societe Nationale Industrielle
• Inventors: Krawczyk, Rodolphe
• Primary Examiner(s): Buczinski, Stephen C.
• Application Number:
  US08/007,631
• Time in Patent Office: 670 Days
• Field of Search: 356/5, 356/1, 356/28.5, 356/152, 356/139.03
• US Class Current: 356/28.5
• CPC Class Codes: B64G 1/22 Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
• CPC Class Codes: G01S 17/87 Combinations of systems using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/95 for meteorological use
• CPC Class Codes: Y02A 90/10 Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Abstract

An observation spacecraft designed for the quantitative evaluation of the activity within a fluid mass borne by a planet embodying a platform adapted to follow an orbit around the planet and including a roll axis designed to be parallel with that orbit and a yaw axis designed to be oriented toward the center of the planet, and an observation assembly composed of a laser generator, a frequency measuring unit, and first and second telescopes, respectively equipped with a sight element having a sight axis designed to be orientated toward the planet; the telescopes are designed to send, from the laser generator, beams that are transmitted from along the sight axes, and to receive, along these axes, reflected beams which they then apply to the frequency measuring unit. The first and second sight elements are connected with the platform by means of rotary motors whose axes are parallel with the roll axis, the first and second sight axes projecting themselves in opposite directions along the roll axis.

Claims

1. An observation space vehicle for quantitatively evaluating, a fluid mass above a surface of a planet while said observation space vehicle orbits said planet along an orbital path, said observation space vehicle comprising:

a platform having a roll axis which is substantially parallel to said orbital path and a yaw axis which approximately intersects the center of said planet, said platform having a forward end and a rearward end relative to a direction of travel of said observation space vehicle along said orbital path;

means supported by said platform for generating a laser beam;

first and second telescopes supported by said platform;

first sight means operatively associated with said first telescope for relaying said laser beam toward said planet along a first sight axis and for receiving a first reflected laser beam along said first sight axis, said first sight axis being oriented in a first direction toward said forward end of said platform such that said first telescope is a forward scanning telescope;

first means supported by said platform for pivoting said first sight means about an axis which is substantially parallel to said roll axis;

second sight means operatively associated with said second telescope for relaying said laser beam toward said planet along a second sight axis and for receiving a second reflected laser beam along said second sight axis, said second sight axis being oriented in a second direction toward said rearward end of said platform such that said second telescope is a rearward scanning telescope;

second means supported by said platform for pivoting said second sight means about an axis substantially parallel to said roll axis; and

means operatively associated with said first and second sight means for measuring and evaluating a frequency of said first and second reflected laser beams.

2. An observation space vehicle according to claim 1 wherein said first and second pivoting means are oscillating rotary motors.

3. An observation space vehicle according to claim 2 wherein said first pivoting means oscillates in an opposite phase relative to said second pivoting means.

4. An observation space vehicle according to claim 3 wherein said first and second pivoting means oscillate so as to have an oscillation period of between about 1 and about 100 seconds.

5. An observation space vehicle according to claim 1 wherein said laser beam generating means comprises a single laser source and a mirror, rotatably mounted relative to said single laser source, said mirror alternately optically connecting said single laser source and said measuring means with said first and second telescopes.

6. An observation space vehicle according claim 1 wherein said laser beam generating means comprises a laser source for each of said first and second telescopes, and wherein said measuring and evaluating means comprises a measuring unit for each of said first and second telescopes.

7. An observation space vehicle according to claim 1 wherein said first and second sight means are optics rigidly mounted to each of said first and second telescopes, said first and second telescopes being connected to said platform with a corresponding one of said first and second pivoting means.

8. An observation space vehicle according to claim 1 wherein said first and second sight means are mirrors which are rotatably mounted relative to said first and second telescopes, said first and second telescopes being rigidly mounted to said platform.

9. An observation space vehicle according to claim 1 wherein said measuring and evaluating means is a coherent detection device.

10. An observation space vehicle according to claim 1 wherein said measuring and evaluating means is a direct detection device.

11. An observation space vehicle according to claim 1 wherein said first and second sight axes each have a tilt angle of between about 20°

and about 80°

relative to said roll axis.

12. An observation space vehicle according to claim 11, wherein said tilt angles are each between about 40°

and about 50°

.

13. A laser observation device for quantitatively evaluating, a fluid mass above a surface of a planet while said laser observation device is transported by a vehicle which is moving along a path above said surface, said laser observation device comprising:

a platform having a roll axis which is substantially parallel to said path, said platform having a forward end and a rearward end relative to a direction of travel of said vehicle along said path;

means supported by said platform for generating a laser beam;

first and second telescopes supported by said platform;

first sight means operatively associated with said first telescope for relaying said laser beam toward said planet along a first sight axis and for receiving a first reflected laser beam along said first sight axis, said first sight axis being oriented in a first direction toward said forward end of said platform such that said first telescope is a forward scanning telescope;

first means supported by said platform for pivoting said first sight means about an axis which is substantially parallel to said roll axis;

second sight means operatively associated with said second telescope for relaying said laser beam toward said planet along a second sight axis and for receiving a second reflected laser beam along said second sight axis, said second sight axis being oriented in a second direction toward said rearward end of said platform such that said second telescope is a rearward scanning telescope;

second means supported by said platform for pivoting said second sight means about an axis substantially parallel to said roll axis; and

means operatively associated with said first and second sight means for measuring and evaluating a frequency of said first and second reflected laser beams.

14. A laser observation device according to claim 13 wherein said first and second pivoting means are oscillating rotary motors.

15. A laser observation device according to claim 13 wherein said laser beam generating means comprises a single laser source and a mirror rotatably mounted relative to said single laser source, said mirror alternately optically connecting said single laser source and said measuring means with said first and second telescopes.

16. A laser observation device according to claim 13 wherein said laser beam generating means comprises a laser source for each of said first and second telescopes, and wherein said measuring and evaluating means comprises a measuring unit for each of said first and second telescopes.

17. A laser observation device according to claim 13 wherein said first and second sight means are optics rigidly mounted to each of said first and second telescopes, said first and second telescopes being connected to said platform with a corresponding one of said first and second pivoting means.

18. A laser observation device according to claim 13 wherein said first and second sight means are mirrors which are rotatably mounted relative to said first and second telescopes, said first and second telescopes being rigidly mounted to said platform.

19. A laser observation device according to claim 13 wherein said measuring and evaluating means is a coherent detection device.

20. A laser observation device according to claim 13 wherein said measuring and evaluating means is a direct detection device.

21. A laser observation device according to claim 13 wherein said first and second sight axes each have a tilt angle of between about 20°

and about 80°

relative to said roll axis.