CN102520409A - Earth observation system and method based on tethered satellite platform - Google Patents

Abstract

An earth observation system and method based on a tethered satellite platform, relating to a space earth observation system and method, belonging to the field of aerospace. The purpose is to aim at the space configuration that the previous interferometric synthetic aperture radar satellite system relies on the earth's gravity to form naturally. Since the sub-star revolves around the parent star, it is difficult to form a stable interference angle between the sub-star and the parent star relative to the observed position on the earth. The problem of not being able to realize full orbital detection. The system includes: parent star, tether, release structure and antenna. First confirm that all parts of the system are functioning normally, and release the antenna to the designated position; make the angle between the line connecting the antenna to a certain point on the ground and the line connecting the parent star to the ground stable; test whether the data transmission is normal; confirm the parent star Observe the target, transmit the target information to the antenna, and complete the tracking and measurement of the target by controlling the attitude of the antenna; the antenna returns the measurement data to the parent star. Realize full orbital detection on the ground.

Description

An earth observation system and method based on a tethered satellite platform

technical field

The invention relates to a space-to-earth observation system and method, belonging to the field of aerospace.

Background technique

Space-based interferometry has been proven to be an effective technology and system for space-based Earth observation based on ground elevation information. The TanDEM-X system that has been realized so far utilizes the space configuration naturally formed between the orbital positions of the two satellites in the formation, which has the advantages of stability, optimization, and easy adjustment, and is also limited by the laws of the formation orbital configuration itself. constraint. The baseline changes slowly and regularly during the orbit of the satellite, and the baseline of some orbital segments is not suitable for the requirements of interferometric imaging. Without the orbit change of the formation configuration, simultaneous interferometric measurements of different ground latitudes cannot be realized. The earth observation system that has been realized so far has not really realized the single flight of the interference and the stability of the baseline, the rapid realization and adjustment of the baseline, the easy realization and high precision of the baseline measurement, the simultaneous coverage of different latitudes around the world, and the work load without Complex tri-sync.

In the past tethered satellite system, by selecting the direction of release of the rope between the parent star and the child star of the tethered satellite, a stable angle between the parent star and the child star to a certain point on the ground can be formed, although this angle provides objectively A stable observation interference angle has been obtained, but the tethered satellite system has never been used for interferometric imaging of the earth.

Since the past interferometric synthetic aperture radar satellite system relies on the natural space configuration formed by the earth's gravity, it is difficult to form a stable interference angle between the child star and the parent star relative to the observed position on the earth because the child star revolves around the parent star, so it cannot be realized full orbit detection.

Contents of the invention

The purpose of the present invention is to aim at the space configuration naturally formed by the conventional interferometric synthetic aperture radar satellite system relying on the gravity of the earth. Since the sub-star revolves around the parent star, it is difficult to form a stable interference between the sub-star and the parent star relative to the observed position on the earth. Therefore, the full orbit detection cannot be realized. An earth observation system and method based on a tethered satellite platform is proposed.

The present invention is an earth observation system based on a tethered satellite platform, which includes: a parent star, a tether, a release structure and an antenna; the antenna is released from the parent star to a designated position according to a set direction by the release structure and unfolded , the parent satellite is connected to the antenna through a tether, and the included angle between the line connecting the antenna to a certain point on the ground and the line connecting the parent satellite to the ground is stable, and the parent satellite is a synthetic aperture radar satellite.

The present invention also provides an earth observation method using the above-mentioned earth observation system based on the tethered satellite platform, which is completed by the following steps:

Step 1: Confirm that all parts of the system are functioning normally, and release the antenna to the designated position according to the set direction;

Step 2: Deploy the antenna to the specified position according to the deployment control law, and adjust the attitude of the antenna so that the parent star and the antenna are connected by a tether, and the angle between the line connecting the antenna to a certain point on the ground and the line connecting the parent star to the ground is stable. changing;

Step 3: Test the data transmission between the antenna and the parent star;

Step 4: Determine whether the data transmission is normal; if not, exit; if normal, enter step 5;

Step 5: The parent star determines the observation target, and then transmits the target information to the antenna, and completes the tracking measurement of the target by the antenna by controlling the attitude of the antenna;

Step 6: Send the data measured by the antenna back to the parent star;

Step 7: After one measurement is over, wait for the parent star to determine the next measurement target, and then return to step 3.

The advantages of the present invention are: the present invention adopts the mature tethered satellite technology, so that the included angle between the line connecting the antenna to a certain point on the ground and the line connecting the parent star to the point on the ground is stable, thereby overcoming the interference imaging satellite in the past , the sub-star revolves around the parent star, it is difficult to form a stable interference angle between the sub-star and the parent star relative to the observed position on the earth, and it can effectively realize full-orbit interference imaging.

Description of drawings

Fig. 1 is the schematic diagram of the earth observation system based on the tethered satellite platform of the present invention;

Fig. 2 is a flow chart of the earth observation method of the earth observation system based on the tethered satellite platform of the present invention.

Detailed ways

Specific embodiment one: the present embodiment is described in conjunction with Fig. 1 below,

An earth observation system based on a tethered satellite platform, which includes: a parent star 1, a tether 3, a release structure and an antenna 2; the antenna 2 is released from the parent star 1 to a designated The parent star 1 and the antenna 2 are connected by a tether 3 and the angle between the line connecting the antenna 2 to a certain point on the ground and the line connecting the parent star 1 to the ground is stable, and the parent star 1 is a synthetic Aperture Radar Satellite.

Specific embodiment 2: The present embodiment will be described below in conjunction with FIG. 1 . This embodiment is a further description of the first embodiment.

The tether 3 can be made of optical fiber material or conductive material, and the tether 3 can also be twined or multi-strand wound.

Specific Embodiment Three: The present embodiment will be described below in conjunction with FIG. 1 . This embodiment is a further description of Embodiment 1.

The antenna 2 is a foldable parabolic antenna or a phased array antenna.

Specific Embodiment 4: The following describes this embodiment in conjunction with FIG. 1 . This embodiment is a further description of Embodiment 1.

The data and energy transmission between the antenna and the parent star 1 is transmitted through a tether or wirelessly.

Specific embodiment five: the present embodiment is described below in conjunction with Fig. 2,

An earth observation method of an earth observation system based on a tethered satellite platform, which is completed by the following steps:

Step 1: Confirm that all parts of the system are functioning normally, and release the antenna to the designated position according to the set direction;

Step 2: Deploy the antenna to the specified position according to the deployment control law, and adjust the attitude of the antenna so that the parent star and the antenna are connected through the tether 3, and the angle between the line connecting the antenna to a certain point on the ground and the line connecting the parent star to the ground is stable Changeless;

Step 3: Test the data transmission between the antenna and the parent star;

Step 4: Determine whether the data transmission is normal; if not, exit; if normal, enter step 5;

Step 5: The parent star determines the observation target, then transmits the target information to the antenna, and completes the tracking measurement of the target by the antenna by controlling the attitude of the antenna;

Step 6: Send the data measured by the antenna back to the parent star;

Step 7: After one measurement is over, wait for the parent star to determine the next measurement target, and then return to step 3.

Claims (5)

1. the earth observation systems based on the tethered satellite platform is characterized in that it comprises: female star (1), tether (3), releasing structure and antenna (2); Said antenna (2) is gone up according to setting direction from female star (1) by releasing structure and is discharged into assigned address and expansion; Female star (1) link to each other through tether (3) with antenna (2) and antenna (2) earthward certain some line and female star (1) earthward the angle of this line stablize constantly, said female star (1) is a Synthetic Aperture Radar satellite.

2. a kind of earth observation systems based on the tethered satellite platform according to claim 1 is characterized in that described tether (3) is fiber optic materials or conductive material, and bifilar winding or multiply are twined.

3. a kind of earth observation systems based on the tethered satellite platform according to claim 1 is characterized in that, described antenna (2) adopts collapsible parabola antenna or phased array antenna.

4. a kind of earth observation systems based on the tethered satellite platform according to claim 1 is characterized in that, data between antenna (2) and the female star (1) and power transfer are through tether (3) transmission or wireless transmission.

5. application rights requires 1 the earth observation method based on the earth observation systems of tethered satellite platform, it is characterized in that adopting following steps to accomplish:

Step 1: confirm that system's each several part function is normal, antenna (2) is discharged into assigned address according to setting direction;

Step 2: according to launching control law antenna (2) is deployed into assigned address, and adjustment antenna (2) attitude makes female star (1) link to each other through tether (3) with antenna (2) and antenna (2) earthward certain some line and female star (1) earthward the angle of this line stablize constant;

Step 3: the data transmission between test antenna (2) and the female star (1);

Step 4: whether the judgment data transmission is normal; If undesired, then withdraw from; If normal, then get into step 5;

Step 5: female star (1) is confirmed observed object, then target information is sent to antenna (2), accomplishes the tracking measurement of antenna (2) to target through control antenna (2) attitude;

Step 6: give female star (1) with the returning data that antenna (2) measures;

Step 7: one-shot measurement finishes, and waits for that female star (1) confirms next measurement target, returns execution in step three then.

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