CN-120263301-B - Laser communication link correction method, system, equipment, medium and product based on wavelet interpolation

CN120263301BCN 120263301 BCN120263301 BCN 120263301BCN-120263301-B

Abstract

The application discloses a laser communication link correction method, a system, equipment, a medium and a product based on wavelet interpolation, and relates to the field of optical communication; the method comprises the steps of obtaining a discrete high-frequency sub-band coefficient, obtaining a discrete low-frequency sub-band coefficient after interpolation processing by adopting a stable high-frequency sub-band coefficient to correct the discrete high-frequency sub-band coefficient after interpolation processing, replacing the discrete low-frequency sub-band coefficient with a coefficient of an enlarged facula image to obtain a discrete low-frequency sub-band coefficient after replacement, calculating a centroid coordinate of the facula image after wavelet interpolation processing and a deflection angle of beacon light by adopting a gray centroid method, and adjusting the deflection angle of a receiving end according to the deflection angle of the beacon light to finish correction of a laser communication link.

Inventors

WANG QIANG
ZHANG JIA
WANG XUEWEI
LIANG QIYUN
CUI LEI

Assignees

哈尔滨工业大学

Dates

Publication Date: 20260508
Application Date: 20250513

Claims (8)

1. A laser communication link correction method based on wavelet interpolation, the laser communication link including a transmitting end and a receiving end, the transmitting end being configured to transmit beacon light, the receiving end being configured to receive the beacon light and convert the beacon light into a flare image, the laser communication link correction method based on wavelet interpolation comprising: Before the smooth wavelet transformation and the discrete wavelet transformation are respectively carried out on the speckle image to obtain the smooth sub-band coefficient and the discrete sub-band coefficient, the method further comprises the following steps: Denoising the facula image by adopting a wavelet threshold algorithm; performing stationary wavelet transform and discrete wavelet transform on the speckle image respectively to obtain stationary subband coefficients and discrete subband coefficients, wherein the stationary subband coefficients comprise stationary low-frequency subband coefficients and stationary high-frequency subband coefficients; Performing interpolation processing on the discrete high-frequency sub-band coefficients to obtain the discrete high-frequency sub-band coefficients after the interpolation processing; Correcting the discrete high-frequency sub-band coefficient subjected to interpolation processing by adopting a stable high-frequency sub-band coefficient to obtain a corrected discrete high-frequency sub-band coefficient, wherein the method specifically comprises the steps of adding the stable high-frequency sub-band coefficient and the discrete high-frequency sub-band coefficient subjected to interpolation processing to obtain a corrected discrete high-frequency sub-band coefficient; expanding the coefficient of the facula image by a preset multiple, and replacing the discrete low-frequency subband coefficient with the coefficient of the expanded facula image to obtain a replaced discrete low-frequency subband coefficient; performing discrete wavelet inverse transformation on the corrected discrete high-frequency subband coefficient and the replaced discrete low-frequency subband coefficient to obtain a facula image after wavelet interpolation processing; calculating the barycenter coordinates of the spot images after wavelet interpolation processing by adopting a gray centroid method; And calculating the deflection angle of the beacon light based on the centroid coordinates of the spot image after wavelet interpolation processing, and adjusting the deflection angle of the receiving end according to the deflection angle of the beacon light to finish the correction of the laser communication link.
2. The method of claim 1, wherein the receiving end is a CMOS camera.
3. The laser communication link correction method based on wavelet interpolation according to claim 1, wherein a calculation formula of centroid coordinates of the spot image after wavelet interpolation processing is: ; Wherein, the The coordinates of the X axis of the centroid of the facula image after wavelet interpolation processing; The speckle image after wavelet interpolation processing is the first Pixel gray level of a row; The speckle image after wavelet interpolation processing is the first Line 1 The frequency with which the pixel gray levels of the columns occur; The total number of pixels of the facula image after the wavelet interpolation processing is the total number of pixels of the facula image; the coordinates of the Y axis of the centroid of the facula image after wavelet interpolation processing; The speckle image after wavelet interpolation processing is the first Pixel gray scale of a column.
4. The laser communication link correction method based on wavelet interpolation according to claim 2, wherein the calculation formula of the deflection angle of the beacon light is: ; ; Wherein, the The coordinates of the X axis of the centroid of the facula image after wavelet interpolation processing; coordinates of the X-axis, which is the center of the CMOS camera field of view; Equivalent focal length of the CMOS camera; the deflection angle of the beacon light in the X-axis direction; the coordinates of the Y axis of the centroid of the facula image after wavelet interpolation processing; coordinates of the Y-axis that is the center of the CMOS camera field of view; is the deflection angle of the beacon light in the Y-axis direction.
5. A laser communication link correction system based on wavelet interpolation, the laser communication link including a transmitting end and a receiving end, the transmitting end being configured to transmit a beacon light, the receiving end being configured to receive the beacon light and convert the beacon light into a flare image, the laser communication link correction system based on wavelet interpolation comprising: Before the smooth wavelet transformation and the discrete wavelet transformation are respectively carried out on the speckle image to obtain the smooth sub-band coefficient and the discrete sub-band coefficient, the method further comprises the following steps: Denoising the facula image by adopting a wavelet threshold algorithm; the system comprises a receiving end, a wavelet transformation module, a receiving end and a transmitting end, wherein the wavelet transformation module is used for respectively carrying out stable wavelet transformation and discrete wavelet transformation on an optical spot image to obtain a stable subband coefficient and a discrete subband coefficient; The interpolation processing module is used for carrying out interpolation processing on the discrete high-frequency sub-band coefficients to obtain the discrete high-frequency sub-band coefficients after interpolation processing; The coefficient correction module is used for correcting the discrete high-frequency sub-band coefficient after interpolation processing by adopting the steady high-frequency sub-band coefficient to obtain the corrected discrete high-frequency sub-band coefficient, and specifically comprises the steps of adding the steady high-frequency sub-band coefficient and the discrete high-frequency sub-band coefficient after interpolation processing to obtain the corrected discrete high-frequency sub-band coefficient; the replacing module is used for expanding the coefficient of the facula image by a preset multiple, and replacing the discrete low-frequency sub-band coefficient with the coefficient of the expanded facula image to obtain a replaced discrete low-frequency sub-band coefficient; The discrete wavelet inverse transformation module is used for carrying out discrete wavelet inverse transformation on the corrected discrete high-frequency subband coefficient and the replaced discrete low-frequency subband coefficient to obtain a facula image after wavelet interpolation processing; the centroid calculation module is used for calculating centroid coordinates of the facula image after wavelet interpolation processing by adopting a gray centroid method; The laser communication link correction module is used for calculating the deflection angle of the beacon light based on the centroid coordinates of the spot image after wavelet interpolation processing, and adjusting the deflection angle of the receiving end according to the deflection angle of the beacon light to finish the correction of the laser communication link.
6. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor executes the computer program to implement the wavelet interpolation based laser communication link correction method of any of claims 1-4.
7. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the wavelet interpolation based laser communication link correction method of any of claims 1-4.
8. A computer program product comprising a computer program which, when executed by a processor, implements the wavelet interpolation based laser communication link correction method of any one of claims 1-4.

Description

Laser communication link correction method, system, equipment, medium and product based on wavelet interpolation Technical Field The present application relates to the field of optical communications, and in particular, to a method, system, device, medium, and product for correcting a laser communication link based on wavelet interpolation. Background In an optical communication system in which a satellite platform operates, attitude adjustment and orbit change of a satellite are normal states, which presents a serious challenge for construction of a laser link. The laser link establishment process comprises three key links, namely signal aiming, initial capturing and continuous tracking are realized through an optical communication terminal. The system maintains tracking accuracy by means of spot position information acquired by the photoelectric detector. In some cases, tracking accuracy of the light spot position is maintained by adopting a centroid method, a curve fitting method, a moment-based method, an interpolation method and the like, however, when the methods deal with complex situations of uneven light spot distribution, background noise in a dynamic environment and the like, light spot subdivision accuracy is limited, so that centroid coordinates of light spots are inaccurate, and connection of a laser communication link is unstable. Disclosure of Invention The application aims to provide a laser communication link correction method, a system, equipment, a medium and a product based on wavelet interpolation, which can improve the stability of a laser communication link by improving the subdivision precision of light spots. In order to achieve the above object, the present application provides the following solutions: in a first aspect, the present application provides a laser communication link correction method based on wavelet interpolation, where the laser communication link includes a transmitting end and a receiving end, the transmitting end is configured to transmit beacon light, and the receiving end is configured to receive the beacon light and convert the beacon light into a light spot image, and the method includes: Performing stationary wavelet transformation and discrete wavelet transformation on an optical spot image respectively to obtain a stationary sub-band coefficient and a discrete sub-band coefficient, wherein the stationary sub-band coefficient comprises a stationary low-frequency sub-band coefficient and a stationary high-frequency sub-band coefficient, and the discrete sub-band coefficient comprises a discrete low-frequency sub-band coefficient and a discrete high-frequency sub-band coefficient; Performing interpolation processing on the discrete high-frequency sub-band coefficients to obtain the discrete high-frequency sub-band coefficients after the interpolation processing; Correcting the discrete high-frequency sub-band coefficient subjected to interpolation processing by adopting a stable high-frequency sub-band coefficient to obtain a corrected discrete high-frequency sub-band coefficient; expanding the coefficient of the facula image by a preset multiple, and replacing the discrete low-frequency subband coefficient with the coefficient of the expanded facula image to obtain a replaced discrete low-frequency subband coefficient; performing discrete wavelet inverse transformation on the corrected discrete high-frequency subband coefficient and the replaced discrete low-frequency subband coefficient to obtain a facula image after wavelet interpolation processing; calculating the barycenter coordinates of the spot images after wavelet interpolation processing by adopting a gray centroid method; And calculating the deflection angle of the beacon light based on the centroid coordinates of the spot image after wavelet interpolation processing, and adjusting the deflection angle of the receiving end according to the deflection angle of the beacon light to finish the correction of the laser communication link. In a second aspect, the present application provides a laser communication link correction system based on wavelet interpolation, where the laser communication link includes a transmitting end and a receiving end, the transmitting end is configured to transmit beacon light, and the receiving end is configured to receive the beacon light and convert the beacon light into a flare image, and the system includes: the system comprises a receiving end, a wavelet transformation module, a receiving end and a transmitting end, wherein the wavelet transformation module is used for respectively carrying out stable wavelet transformation and discrete wavelet transformation on an optical spot image to obtain a stable subband coefficient and a discrete subband coefficient; The interpolation processing module is used for carrying out interpolation processing on the discrete high-frequency sub-band coefficients to obtain the discrete high-frequency sub-band coefficients after interpol