A sun light positioning method based on a spacecraft imaging type laser detection system

Abstract

The application relates to a sunlight positioning method based on an imaging type laser detection system of a spacecraft, and has the characteristics that based on the working principle of the imaging type laser detection system carried on the spacecraft platform, a method for simultaneously carrying out sunlight positioning on the basis of meeting the laser detection function is designed. The method combines the space-based pulse laser detection principle of the imaging type laser detection system, realizes the positioning of sunlight through equipment algorithms under the premise of not increasing hardware, and can simultaneously meet the requirements of the spacecraft laser detection and the sunlight positioning.

Description

Technical Field

[0001] This invention relates to a solar positioning method based on a spacecraft imaging laser detection system, particularly for space-based laser target detection, and belongs to the field of aerospace technology. Background Technology

[0002] Since the beginning of the 21st century, laser technology has developed rapidly, with increasingly diverse types and continuously improving performance. Because laser sources possess superior performance in terms of coherence, directionality, and monochromaticity, they are now widely used in aerospace, medical equipment, manufacturing, and precision machinery, such as in space laser communication, lidar, optical tweezers, laser collimation, and laser positioning. In space-based satellites, lidar and laser ranging are widely used for spacecraft to measure the distance and angle of non-cooperative targets. Therefore, spacecraft can be equipped with laser detection systems to effectively detect such pulsed lasers and output measurement information in a timely manner, which can serve as a basis for ground-based decision-making.

[0003] As laser detection technology matures, it has been found that it needs to be used in conjunction with other onboard equipment, such as sun sensors, cameras, and other detection technologies, to refine decision-making evidence. Therefore, all of these devices need to have backups and be able to work collaboratively and verify each other. To achieve this goal with minimal resource consumption, a spacecraft imaging laser detection system is used to simultaneously perform solar positioning. Summary of the Invention

[0004] In view of this, this invention, based on a spacecraft imaging laser detection system, designs an algorithm that addresses the interdependent working principle of sunlight positioning and laser positioning to achieve sunlight positioning. This method, while fulfilling the function of laser target detection, can also detect sunlight, greatly conserving onboard resources.

[0005] A method for sun positioning based on a spacecraft imaging laser detection system includes:

[0006] Step 1: For typical laser targets in space, an imaging laser detection system based on an array detector is used for detection;

[0007] Step 2: The method for detecting pulsed lasers using an imaging laser detection system is as follows: For the two images, Image 1 and Image 2, obtained successively by the imaging laser detection system, in order to improve the signal-to-noise ratio of pulsed laser recognition, differential calculation is performed on Image 1 and Image 2 to obtain Image 3; Spot recognition is performed based on Image 3. If there is an image in it, then the image in Image 3 is the image of the pulsed laser, and the laser target position is obtained by center point extraction calculation.

[0008] Step 3: Set up an identification marker in the imaging laser detection system. When a laser target location is output, simultaneously extract Image 1 and Image 2 at that time.

[0009] Step 4: Analyze Images 1 and 2, calculate the position of the center point of the light spot, and compare the center point positions. If they are the same, it indicates that the position is the center point of the sunlight imaging. The position of the sunlight target can be obtained by center point extraction calculation.

[0010] Ideally, an imaging laser detection system only outputs the angle of the laser target and does not output an image.

[0011] Preferably, the imaging laser detection system uses an optical lens and an area array detector to achieve imaging laser detection.

[0012] The present invention has the following beneficial effects:

[0013] This invention provides a method for locating sunlight based on a spacecraft imaging laser detection system. Its key features are: based on the working principle of the imaging laser detection system mounted on the spacecraft platform, a method was designed to simultaneously perform sunlight location while fulfilling laser detection functions. This method combines the principle of space-based pulsed laser detection by the imaging laser detection system, achieving sunlight location through equipment algorithms without adding hardware. It can simultaneously meet the needs of spacecraft laser detection and sunlight location, and can be used as a backup for the solar sensor, saving onboard resources. Detailed Implementation

[0014] This invention provides a method for solar positioning based on a spacecraft imaging laser detection system, specifically including the following steps:

[0015] Step 1: For typical laser targets in space, an imaging laser detection system based on an array detector is used for detection;

[0016] Step 2: The method for detecting pulsed lasers using an imaging laser detection system is as follows: For the two images, Image 1 and Image 2, obtained sequentially by the imaging laser detection system, differential calculation is performed on Image 1 and Image 2 to obtain Image 3 in order to improve the signal-to-noise ratio of pulsed laser recognition; spot recognition is performed based on Image 3. If there is an image in Image 3, then the image in Image 3 is the image of the pulsed laser, and the laser target position can be obtained by center point extraction calculation; to save on-board resources, the imaging laser detection system generally only outputs the angle and not the image.

[0017] Step 3: Set up an identification marker in the imaging laser detection system. When a laser target location is output, simultaneously extract Image 1 and Image 2 at that time.

[0018] Step 4: Analyze Images 1 and 2, calculate the center point position of the light spot, and compare the center point positions. If they are the same, it indicates that this position is the center point of the sunlight image. The location of the sunlight target can be obtained by center point extraction calculation. Because if it were a pulsed laser target, its position in the two images would not be the same due to its faster movement speed. Therefore, it is determined that the target is the sun, not a pulsed laser target.

[0019] The imaging laser detection system of the present invention uses an optical lens and an area array detector to achieve imaging laser detection.

[0020] For lidar and laser ranging, spacecraft can be equipped with laser detection systems for effective detection.

[0021] The function of a laser detection system is to receive pulsed laser signals emitted by lidar and laser ranging, and output the laser angle. According to the detection principle, it can be divided into two types: imaging type and non-imaging type. Imaging type laser detection systems have the advantage of high detection accuracy, can more accurately locate target spacecraft, and have a wider range of application prospects.

[0022] When an imaging laser detection system is used in orbit, its working principle is to calculate the position coordinates of the center point of the laser spot formed on the array detector based on the incident laser spot, and output the incident angle of the target laser based on the optical design of the laser detection system.

[0023] This invention addresses the scenario where a laser detection system is simultaneously illuminated by both sunlight and laser light, identifying both the laser incident angle and the solar incident angle. The spacecraft laser detection system acquires image data online in real-time during operation; to conserve on-orbit resources, not all images are stored. The difference between the first and second images is calculated in real-time; if a pulse signal is detected, both images are stored and output. Since the incident laser is pulsed and sunlight is continuous, the difference between the two images represents the pulsed laser spot, and the overlapping portion represents the solar spot.

[0024] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for solar positioning based on a spacecraft imaging laser detection system, characterized in that, include: Step 1: For typical laser targets in space, an imaging laser detection system based on an array detector is used for detection; Step 2: The method for detecting pulsed lasers using an imaging laser detection system is as follows: For the two images, Image 1 and Image 2, obtained successively by the imaging laser detection system, in order to improve the signal-to-noise ratio of pulsed laser recognition, differential calculation is performed on Image 1 and Image 2 to obtain Image 3; Spot recognition is performed based on Image 3. If there is an image in it, then the image in Image 3 is the image of the pulsed laser, and the laser target position is obtained by center point extraction calculation. Step 3: Set up an identification marker in the imaging laser detection system. When a laser target location is output, simultaneously extract Image 1 and Image 2 at that time. Step 4: Analyze Images 1 and 2, calculate the position of the center point of the light spot, and compare the center point positions. If they are the same, it indicates that the position is the center point of the sunlight imaging. The position of the sunlight target can be obtained by center point extraction calculation.

2. The solar positioning method based on a spacecraft imaging laser detection system as described in claim 1, characterized in that, Imaging laser detection systems only output the angle of the laser target, not an image.

3. The solar positioning method based on a spacecraft imaging laser detection system as described in claim 1, characterized in that, Imaging laser detection systems use optical lenses and area array detectors to achieve imaging laser detection.