CN113595635A - Ground debugging method for satellite-borne laser communication equipment - Google Patents
Ground debugging method for satellite-borne laser communication equipment Download PDFInfo
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- CN113595635A CN113595635A CN202111079200.7A CN202111079200A CN113595635A CN 113595635 A CN113595635 A CN 113595635A CN 202111079200 A CN202111079200 A CN 202111079200A CN 113595635 A CN113595635 A CN 113595635A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/118—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum specially adapted for satellite communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/073—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an out-of-service signal
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Abstract
The invention discloses a ground debugging method of satellite-borne laser communication equipment, which is characterized by comprising the following steps of: 1) designing an optical system; 2) recording the modulation transfer function of the optical system; 3) changing the working wavelength of the system; 4) storing the wavelength value lambda 1; 5) debugging; 6) and correcting the debugging wavelength. The method has the advantages of strong operability, simple operation, good reliability, low implementation cost, contribution to batch production and better practical value in the aspect of debugging and application of the satellite-borne laser communication equipment.
Description
Technical Field
The invention relates to a laser communication technology, in particular to a ground debugging method for satellite-borne laser communication equipment.
Background
With the continuous development of space resources, the inter-satellite and satellite-ground communication network gradually becomes an important component in the global communication network. The carrier waves adopted for realizing the satellite-borne communication comprise microwave and light waves, the traffic of images, videos and the like is continuously increased along with the more frequent space activities, and short boards with insufficient microwave communication transmission capacity are increasingly highlighted. The laser communication has the advantages of high transmission rate, small volume, low power consumption, light weight, good confidentiality and strong anti-interference capability, and the advantages of the laser communication make the laser communication very suitable for carrying a satellite platform, particularly the application on the small satellite platform, and meanwhile, the laser communication has wide application prospect. With the rapid development of commercial aerospace in recent years, satellite-borne laser communication attracts more and more eyes, so that satellite-borne optical communication has become one of the key development directions of satellite communication.
With the wide application of the satellite-borne laser communication equipment in the aerospace field, the batch and low cost become development trends, and new requirements are provided for the debugging speed and the universality of the satellite-borne laser communication equipment. The satellite-borne laser communication system generally comprises light paths such as a signal receiving light path, a fine tracking light path, a signal transmitting light path, a beacon transmitting light path, a coarse tracking light path and the like, and the light paths are adjusted to be parallel on the ground, so that the light paths are adjusted to the optimal imaging effect to ensure that the equipment can finish capturing, tracking and aligning with other equipment after entering a preset track and realize communication. Because the outer space is in a vacuum environment and the ground debugging is in a normal-pressure environment, certain measures are required to compensate the influence of the pressure intensity during the ground debugging.
At present, compensation methods adopted by satellite-borne laser communication equipment mainly include two types: 1. adding a compensating mirror for compensation, namely adding a designed compensating mirror in front of the equipment for debugging during ground debugging, and taking down the compensating mirror after the debugging is finished under normal pressure, wherein the equipment meets the use condition of optimal image quality under vacuum; 2. and (3) vacuum defocusing compensation, namely after the focus is adjusted under normal pressure, moving the detector or the optical fiber by a corresponding distance according to the difference between the positions of the vacuum focus and the normal pressure focus simulated by software, wherein the equipment meets the use condition of the best image quality under vacuum at the moment. The scheme 1 is complex to debug, the compensation mirror needs additional tooling, additional variables are added by adding the compensation mirror, one compensation mirror is only suitable for one optical path, different compensation mirrors are needed for different optical paths, the debugging time is long, and the additional cost of the compensation mirror is high; the scheme 2 cannot ensure that the defocusing moves completely along the axial direction, and can introduce eccentricity and inclination errors, so that the method cannot be quantized, and has poor reliability and low operability.
Disclosure of Invention
The invention aims to provide a ground debugging method of satellite-borne laser communication equipment, aiming at the defects of the prior art. The method has the advantages of strong operability, simple operation, good reliability, low implementation cost, contribution to batch production and better practical value in the aspect of debugging and application of the satellite-borne laser communication equipment.
The technical scheme for realizing the purpose of the invention is as follows:
a ground debugging method for satellite-borne laser communication equipment comprises the following steps:
1) designing an optical system: the method comprises the steps that an optical design software is adopted to design and complete the satellite-borne laser communication system, the environment condition of the satellite-borne laser communication system is the working environment of the actual satellite-borne laser communication system, namely the vacuum environment, and the MTF of the satellite-borne laser communication system at the moment is recorded;
2) recording optical system modulation transfer function: changing the system environment condition into normal pressure in optical design software, recording the modulation transfer function MTF of the optical system at the moment, wherein the closer the MTF curve of the optical system is to the diffraction limit curve in the MTF curve graph, the better the imaging effect is;
3) changing the working wavelength of the system: changing the working wavelength of the satellite-borne laser communication system in optical design software, initially adopting large wavelength interval adjustment, adjusting the wavelength interval to 3-10 nm, preliminarily determining the range of the debugging wavelength, namely adjusting the wavelength to enable the MTF curve to be closest to the diffraction limit time MTF curve, determining the range of the debugging wavelength as the preliminarily determined debugging wavelength range, after determining the debugging wavelength range, adopting small wavelength interval adjustment, adjusting the wavelength interval to 0.05-0.2 nm and searching, after changing the wavelength each time, updating system parameters, namely MTF curve graph parameters, obtaining the MTF of the satellite-borne laser communication system at the moment, and comparing the MTF of the satellite-borne laser communication system at the moment with the MTF recorded in the step 1);
4) save wavelength value λ 1: when the MTF of the satellite-borne laser communication system obtained in the step 3) is most similar to the MTF recorded in the step 1), namely when the difference of the MTF values is minimum, the wavelength value lambda 1 when the small wavelength interval is adjusted at the moment is stored;
5) debugging: adopting the wavelength value lambda 1 stored in the step 4) to carry out ground light path debugging on the satellite-borne laser communication system;
6) and (3) correcting and debugging wavelength: testing the satellite-borne laser communication system in a vacuum tank to obtain the actual MTF of the satellite-borne laser communication system at the moment, comparing the simulation result MTF in the step 3) with the MTF, finding out the closest wavelength lambda 2 according to the MTF result in the vacuum tank, obtaining the wavelength correction quantity (lambda 1-lambda 2) =deltalambda, and determining the final debugging wavelength to be lambda 1 plus delta lambda.
The optical system in the satellite-borne laser communication system in the technical scheme can be a transmission type or refraction and reflection type optical system influenced by air pressure.
According to the technical scheme, the debugging wavelength value is adjusted in the optical simulation software to compensate the pressure intensity change of vacuum and normal pressure, the compensation effect can be achieved only by software operation and laser debugging, and the debugging difficulty is not increased additionally; the technical scheme is suitable for debugging each optical system of the laser communication equipment, and only the wavelength of the laser needs to be adjusted and debugged.
The method has the advantages of strong operability, simple operation, good reliability and low implementation cost, and has good practical value in the aspect of debugging and application of the satellite-borne laser communication equipment.
Drawings
FIG. 1 is a schematic flow chart of an exemplary method.
Detailed Description
The invention will be further elucidated with reference to the drawings and examples, without however being limited thereto.
Example (b):
referring to fig. 1, a ground debugging method for a satellite-borne laser communication device includes the following steps:
1) designing an optical system: the method comprises the steps that an optical design software is adopted to design and complete the satellite-borne laser communication system, the environment condition of the satellite-borne laser communication system is the working environment of the actual satellite-borne laser communication system, namely the vacuum environment, and the MTF of the satellite-borne laser communication system at the moment is recorded;
2) recording optical system modulation transfer function: changing the system environment condition into normal pressure in optical design software, recording the modulation transfer function MTF of the optical system at the moment, wherein the closer the MTF curve of the optical system is to the diffraction limit curve in the MTF curve graph, the better the imaging effect is;
3) changing the working wavelength of the system: changing the working wavelength of the satellite-borne laser communication system in optical design software, initially adopting large wavelength interval adjustment, adjusting the wavelength interval to 3-10 nm, preliminarily determining the range of the debugging wavelength, namely adjusting the wavelength to enable the MTF curve to be closest to the diffraction limit time MTF curve, determining the range of the debugging wavelength as the preliminarily determined debugging wavelength range, after determining the debugging wavelength range, adopting small wavelength interval adjustment, adjusting the wavelength interval to 0.05-0.2 nm and searching, after changing the wavelength each time, updating system parameters, namely MTF curve graph parameters, obtaining the MTF of the satellite-borne laser communication system at the moment, and comparing the MTF of the satellite-borne laser communication system at the moment with the MTF recorded in the step 1);
4) save wavelength value λ 1: when the MTF of the satellite-borne laser communication system obtained in the step 3) is most similar to the MTF recorded in the step 1), namely when the difference of the MTF values is minimum, the wavelength value lambda 1 when the small wavelength interval is adjusted at the moment is stored;
5) debugging: adopting the wavelength value lambda 1 stored in the step 4) to carry out ground light path debugging on the satellite-borne laser communication system;
6) and (3) correcting and debugging wavelength: testing the satellite-borne laser communication system in a vacuum tank to obtain the actual MTF of the satellite-borne laser communication system at the moment, comparing the simulation result MTF in the step 3) with the MTF, finding out the closest wavelength lambda 2 according to the MTF result in the vacuum tank, obtaining the wavelength correction quantity (lambda 1-lambda 2) =deltalambda, and determining the final debugging wavelength to be lambda 1 plus delta lambda.
The optical system in the satellite-borne laser communication system in the example can be a transmission type or a catadioptric type optical system influenced by air pressure.
The optical system in the satellite-borne laser communication system in the embodiment is also suitable for environments such as stratosphere and the like which need air pressure compensation.
Claims (1)
1. A ground debugging method for satellite-borne laser communication equipment is characterized by comprising the following steps:
1) designing an optical system: the method comprises the steps that an optical design software is adopted to design and complete the satellite-borne laser communication system, the environment condition of the satellite-borne laser communication system is the working environment of the actual satellite-borne laser communication system, namely the vacuum environment, and the MTF of the satellite-borne laser communication system at the moment is recorded;
2) recording optical system modulation transfer function: changing the system environment condition into normal pressure in optical design software, and recording the modulation transfer function MTF of the optical system at the moment;
3) changing the working wavelength of the system: changing the working wavelength of the satellite-borne laser communication system in optical design software, initially adopting large wavelength interval adjustment, adjusting the wavelength interval to 3-10 nm, preliminarily determining the range of the debugging wavelength, namely adjusting the wavelength to enable the MTF curve to be closest to the diffraction limit time MTF curve, determining the range of the debugging wavelength as the preliminarily determined debugging wavelength range, after determining the debugging wavelength range, adopting small wavelength interval adjustment, adjusting the wavelength interval to 0.05-0.2 nm and searching, after changing the wavelength each time, updating system parameters, namely MTF curve graph parameters, obtaining the MTF of the satellite-borne laser communication system at the moment, and comparing the MTF of the satellite-borne laser communication system at the moment with the MTF recorded in the step 1);
4) save wavelength value λ 1: when the MTF of the satellite-borne laser communication system obtained in the step 3) is most similar to the MTF recorded in the step 1), namely when the difference of the MTF values is minimum, the wavelength value lambda 1 when the small wavelength interval is adjusted at the moment is stored;
5) debugging: adopting the wavelength value lambda 1 stored in the step 4) to carry out ground light path debugging on the satellite-borne laser communication system;
6) and (3) correcting and debugging wavelength: testing the satellite-borne laser communication system in a vacuum tank to obtain the actual MTF of the satellite-borne laser communication system at the moment, comparing the simulation result MTF in the step 3) with the MTF, finding out the closest wavelength lambda 2 according to the MTF result in the vacuum tank, obtaining the wavelength correction quantity (lambda 1-lambda 2) =deltalambda, and determining the final debugging wavelength to be lambda 1 plus delta lambda.
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