CN113965260A - Space laser communication networking multi-light-spot simultaneous tracking method and device based on code division multiple access - Google Patents

Space laser communication networking multi-light-spot simultaneous tracking method and device based on code division multiple access Download PDF

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CN113965260A
CN113965260A CN202111085708.8A CN202111085708A CN113965260A CN 113965260 A CN113965260 A CN 113965260A CN 202111085708 A CN202111085708 A CN 202111085708A CN 113965260 A CN113965260 A CN 113965260A
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code
beacon
light
current
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CN113965260B (en
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于笑楠
鲁郁
董岩
张磊
田明广
赵佰秋
王潼
王俊尧
姜会林
佟首峰
董科研
宋延嵩
张梓琪
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Changchun University of Science and Technology
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

A space laser communication networking multi-light-spot simultaneous tracking method and device based on code division multiple access relates to the field of space laser communication. Aiming at the problems that the beam divergence angle of the existing communication laser is small, the broadcast one-to-many simultaneous communication is difficult to realize, and the requirement of simultaneous interactive transmission of multipoint information of a satellite internet cannot be met, the application provides a space laser communication networking multi-light spot simultaneous tracking method and device based on code division multiple access, and the method comprises the following steps: the system comprises a slave optical transceiver A, a slave optical transceiver B, a slave optical transceiver C and a master optical transceiver; the main optical terminal includes: the system comprises a parabolic reflector optical antenna, an optical filter, a spectroscope, a beacon light modulation and servo measurement and control board, a wavelength division multiplexing communication transmitter, a wavelength division multiplexing communication receiver and a communication baseband and photoelectric exchange board; resolving the beacon light position through a PSD position sensor; the servo measurement and control board controls the swing angle of the parabolic reflector according to the resolving result modulated by the beacon; suitable for use in applications where communication services are provided in remote locations.

Description

Space laser communication networking multi-light-spot simultaneous tracking method and device based on code division multiple access
Technical Field
The invention relates to the field of space laser communication, in particular to a method and a device for simultaneously tracking multiple light spots of a space laser communication networking based on code division multiple access.
Background
Satellite internet communication constructs a network covering the earth completely by transmitting a certain number of satellite groups, and provides communication service for oceans, deserts and other remote areas which cannot be covered by ground base stations. At present, the information transmission of the satellite internet is mainly realized by means of microwave communication and is limited by conditions such as carrier frequency, power and the like, the transmission rate of the microwave communication among satellites is in the order of hundreds of million per second, and the requirement of real-time transmission of large-capacity data of a 5G network cannot be met. The space laser communication has the advantages of high transmission rate, low power consumption, small volume, no bandwidth limitation and the like, and has wide application prospect in the fields of mobile networks, satellite communication and the like. However, because the divergence angle of the communication laser beam is small, the broadcast one-to-many simultaneous communication is difficult to realize, and the requirement of simultaneous interactive transmission of satellite internet multipoint information cannot be met. In order to realize multi-node laser high-speed data transmission in a spatial information network, research on related technologies and methods is carried out at home and abroad, but related research results are few.
Jiangying et al proposed a one-to-many simultaneous spatial laser communication method (journal: Chinese laser, 2015, vol. 42, No. 4, 0405008) based on paraboloidal optics, which realizes multi-beam simultaneous tracking under the condition that beacon light and tracking cameras are in one-to-one correspondence, and can realize one-to-many simultaneous laser communication in a large spatial range. Through development for 8 years, the system has realized one-to-two outfield dynamic test and one-to-three laboratory demonstration verification. However, due to the limitation of the tracking principle and structure of multiple beacon beams, although the optical antenna subsystem and the relay optical analysis system can combine and receive multiple beams, the subsequent transceiver optical subsystem still needs independent beacon tracking cameras corresponding to externally input beacon beams one by one, so as to realize independent tracking of each beam. Namely, a single tracking camera cannot simultaneously track a plurality of light spots to the same tracking point, so that the linkage effect of a subsequent servo control system is limited, and the tracking effect is poor.
Meanwhile, errors are easily generated in the installation and adjustment process of the optical transceiver, so that the phenomenon that the communication light and the beacon light are not coaxial occurs, namely when the beacon light is tracked to the target of the tracking camera, the received communication power is not the maximum value point received by the communication light at the moment, and unnecessary received communication light energy loss is caused. To solve the problem, tianmingming et al have proposed a method and apparatus for communication and tracking combination based on PSD position sensor (application No. 2021109619182, 2021, 8/20), and have disclosed a method for receiving light beam and converting it into electric signal by PSD position detector, entering into AD collection module through trans-resistance amplification and conversion into piezoelectric signal, and then outputting demodulation result of light beam modulation information and center of gravity position of light beam, respectively, achieving the purpose of combining communication and tracking in space laser system, avoiding the step of realizing communication light real-time tracking beacon light, and also avoiding the problem that communication light can not be aligned on the target surface of detector because the sensor is installed on different axes with the detector in the installation process of equipment.
Disclosure of Invention
Aiming at the problems that the beam divergence angle of the existing communication laser is small, the broadcast type one-to-many simultaneous communication is difficult to realize, and the requirement of simultaneous interactive transmission of satellite internet multipoint information cannot be met, the application combines an antenna of a one-to-many simultaneous space laser communication method based on a paraboloid of revolution optical principle and a communication and tracking composite method based on a PSD position sensor in the background technology to provide a space laser communication networking multi-light spot simultaneous tracking method and device based on code division multiple access, and the method specifically comprises the following steps:
a method for simultaneously tracking multiple light spots of a space laser communication network based on code division multiple addresses comprises the following steps:
the three slave optical transceivers surround the master optical transceiver, and the included angle between the three slave optical transceivers is 120 degrees; the three slave optical transceivers comprise a slave optical transceiver A, a slave optical transceiver B and a slave optical transceiver C;
the parabolic reflection optical antenna receives three groups of light beams sent by the optical transceiver, each group of light beams comprises a beacon light and a communication light, the parabolic reflection optical antenna converts all the received light beams into parallel light and then transmits the parallel light to the 800/1550nm broadband optical filter, the 800/1550nm broadband optical filter reflects the three received communication lights in the parallel light to the spatial optical coupler, and the three beacon lights in the parallel light are transmitted and then transmitted by the beam splitter and then transmitted to the target surface of the PSD position sensor;
the beacon laser is used for emitting beacon light modulated by a code division multiple access method under the control of the beacon light modulation and servo measurement and control board; the emission beacon light is emitted to the light splitting sheet, refracted by the light splitting sheet, transmitted by the 800/1550nm broadband optical filter and then incident to the parabolic reflector optical antenna;
the PSD position sensor outputs an electric signal to the beacon light modulation and servo measurement and control board;
the beacon light modulation and servo measurement and control board is used for resolving the received signals to obtain a resolving result, wherein the resolving result is the actual positions of light spots of the three beacon lights; and the three communication lights are accurately incident on the space optical coupler to realize stable communication.
Further, the beacon light modulation and servo measurement and control board is used for resolving the received signal to obtain a settlement result, and is realized through software, and the specific resolving process is as follows:
three PRN codes of corresponding code patterns are generated by local codeNCO under the drive of frequency words, wherein the three PRN codes are respectively as follows: PRN1、PRN2And PRN3A step (2);
dividing the three PRN codes into three different phases, which are respectively: look ahead PRN1Code, Current PRN1Code, lag PRN1Code, look-ahead PRN2Code, Current PRN2Code, lag PRN2Code, look-ahead PRN3Code, Current PRN3Code and lag PRN3A step of coding;
associating said beacon signal x1 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal x1 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal x1 with said lead PRN3Code, Current PRN3Code and lag PRN3Performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN3Code, Current PRN3Code sum lag PRN3Performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN3Code, Current PRN3Code and lag PRN3Performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN3Code, Current PRN3Code and lag PRN3Performing cross-correlation operation on the codes;
processing the results of the 12 cross-correlation operations by phase discrimination operation, and adjusting corresponding PRNs according to the processing results1、PRN2And PRN3A step of code setting the correlation peak value of the current code to 1 and acquiring rho values corresponding to three current PRN codes respectively; the rho is x1, x2, y1 and y2 corresponding to the three current codes;
respectively calculating the positions of three light spots on the target surface of the PSD position sensor according to the rho values corresponding to the three current PRN codes;
the calculating of the position of the light spot on the target surface of the PSD position sensor specifically comprises the following steps: according to the following formula:
Figure BDA0003265459040000031
wherein, DeltanxRepresenting the actual position of the centre of gravity of the spot, Δ, in the direction of the x-axisnyRepresenting the actual position of the centre of gravity of the spot in the direction of the y-axis, Pnx1、Pnx2、Pny1And Pny2Is said ρ, and is the values of x1, x2, y1 and y2, respectively, for the current code, and L is the PSD position sensor target surface half-size.
Further, the light splitting sheet is a wavelength light splitting sheet.
Further, the optical fiber circulator is a graded index optical fiber circulator.
Furthermore, the beacon light modulation and servo control board simultaneously has the code division multiple access electric signal output function, the PSD beacon light position and beacon light communication data resolving function and the simple pendulum rotation angle control function.
An apparatus for simultaneous multi-spot tracking in a space laser communication network based on Code Division Multiple Access (CDMA), the apparatus comprising:
three slave optical transceivers and a master optical transceiver; the three slave optical transceivers surround the main optical transceiver, and included angles between the three slave optical transceivers are 120 degrees; the three slave optical transceivers comprise a slave optical transceiver A, a slave optical transceiver B and a slave optical transceiver C;
the main optical terminal comprises: the system comprises a parabolic reflector optical antenna, an 800/1550nm broadband optical filter, a light splitting sheet, a beacon laser, a beacon light modulation and servo measurement and control board, a spatial light coupler, an optical fiber circulator, a wavelength division multiplexing communication transmitter, a wavelength division multiplexing communication receiver and a communication baseband and photoelectric exchange board;
the parabolic mirror optical antenna includes: a rotating parabolic mirror;
the parabolic reflection optical antenna receives three groups of light beams sent by the optical transceiver, each group of light beams comprises a beacon light and a communication light, the parabolic reflection optical antenna converts all the received light beams into parallel light and then transmits the parallel light to the 800/1550nm broadband optical filter, the 800/1550nm broadband optical filter reflects the three received communication lights in the parallel light to the spatial optical coupler, and the three beacon lights in the parallel light are transmitted and then transmitted by the beam splitter and then transmitted to the target surface of the PSD position sensor;
the beacon laser is used for emitting beacon light modulated by a code division multiple access method under the control of the beacon light modulation and servo measurement and control board; the emission beacon light is emitted to the light splitting sheet, refracted by the light splitting sheet, transmitted by the 800/1550nm broadband optical filter and then incident to the parabolic reflector optical antenna; the emitted beacon light refracted by the light splitting sheet can be coaxial with the beacon light incident to the light splitting sheet through the 800/1550nm broadband optical filter.
The PSD position sensor outputs an electric signal to the beacon light modulation and servo measurement and control board;
the beacon light modulation and servo measurement and control board is used for resolving the received signals to obtain a resolving result, wherein the resolving result is the actual positions of light spots of the three beacon lights; and the system is also used for controlling the swing angle of the parabolic reflector according to the calculation result, so that the three communication lights are accurately incident on the space optical coupler to realize tracking.
Further, the beacon light modulation and servo measurement and control board is used for resolving the received signal to obtain a settlement result, and is realized through a software module embedded in the beacon light modulation and servo measurement and control board, wherein the software module comprises:
three PRN codes of corresponding code patterns are generated by local codeNCO under the drive of frequency words, wherein the three PRN codes are respectively as follows: modules for PRN1, PRN2, and PRN 3;
dividing the three PRN codes into three different phases, which are respectively: a module for advancing the PRN1 code, the current PRN1 code, the lagging PRN1 code, the advancing PRN2 code, the current PRN2 code, the lagging PRN2 code, the advancing PRN3 code, the current PRN3 code, and the lagging PRN3 code;
means for cross-correlating said beacon signal x1 with said leading PRN1 code, said current PRN1 code, and said lagging PRN1 code;
means for cross-correlating said beacon signal x1 with said leading PRN2 code, said current PRN2 code, and said lagging PRN2 code;
means for cross-correlating said beacon signal x1 with said leading PRN3 code, said current PRN3 code, and said lagging PRN3 code;
means for cross-correlating said beacon signal x2 with said leading PRN1 code, said current PRN1 code, and said lagging PRN1 code;
means for cross-correlating said beacon signal x2 with said leading PRN2 code, said current PRN2 code, and said lagging PRN2 code;
means for cross-correlating said beacon signal x2 with said leading PRN3 code, said current PRN3 code, and said lagging PRN3 code;
means for cross-correlating said beacon signal y1 with said leading PRN1 code, said current PRN1 code, and said lagging PRN1 code;
means for cross-correlating said beacon signal y1 with said leading PRN2 code, said current PRN2 code, and said lagging PRN2 code;
means for cross-correlating said beacon signal y1 with said leading PRN3 code, said current PRN3 code, and said lagging PRN3 code;
means for cross-correlating said beacon signal y2 with said leading PRN1 code, said current PRN1 code, and said lagging PRN1 code;
means for cross-correlating said beacon signal y2 with said leading PRN2 code, said current PRN2 code, and said lagging PRN2 code;
means for cross-correlating said beacon signal y2 with said leading PRN3 code, said current PRN3 code, and said lagging PRN3 code;
processing the results of the 12 cross-correlation operations through phase discrimination operation, respectively adjusting corresponding PRN1, PRN2 and PRN3 codes according to the processing results to enable the value of the correlation peak of the current code to be 1, and acquiring rho values corresponding to three current PRN codes; the rho is x1, x2, y1 and y2 corresponding to the three current codes;
a module for respectively calculating the positions of three light spots on the target surface of the PSD position sensor according to the rho values corresponding to the three current PRN codes;
the calculating of the position of the light spot on the target surface of the PSD position sensor specifically comprises the following steps: according to the following formula:
Figure BDA0003265459040000061
Figure BDA0003265459040000062
wherein, DeltanxRepresenting the actual position of the centre of gravity of the spot, Δ, in the direction of the x-axisnyRepresenting the actual position of the centre of gravity of the spot in the direction of the y-axis, Pnx1、Pnx2、Pny1And Pny2Is said ρ, and is the values of x1, x2, y1 and y2, respectively, for the current code, and L is the PSD position sensor target surface half-size.
Further, the light splitting sheet is a wavelength light splitting sheet.
Further, the optical fiber circulator is a graded index optical fiber circulator.
Furthermore, the beacon light modulation and servo control board simultaneously has the code division multiple access electric signal output function, the PSD beacon light position and beacon light communication data resolving function and the simple pendulum rotation angle control function.
The application has the advantages that:
the invention combines a communication and tracking composite method and a device based on a PSD position sensor in the background technology of the PSD position sensor with a one-to-many simultaneous space laser communication method based on a paraboloid of revolution optical principle in the background technology of a paraboloid reflector optical antenna in a combined invention mode, adopts a processing mode of pseudo-random code and phase discrimination operation to solve the problems that the communication laser beam divergence angle is small, the broadcast one-to-many simultaneous communication is difficult to realize, and the requirement of simultaneous interactive transmission of multi-point information of a satellite internet can not be met in the prior art, meanwhile, the problem that the communication light can not be completely aligned on the target surface of the detector due to the fact that the sensor is installed and the detector are not coaxial in the installation process of the device is solved, and the purpose of compounding communication and tracking in the space laser system is realized while one-to-many simultaneous communication and networking are realized.
According to the method, the PSD position sensor communication and tracking composite multi-target position detection are utilized, the simultaneous detection of multiple beam miss amounts of a single detector is realized, the defect that a single tracking camera cannot track multiple light spots to the same tracking point at the same time is overcome, and the linkage effect of a subsequent servo control system is improved; the simultaneous capturing and aligning requirements of a plurality of optical axes of the laser communication system are met; the problem that one-to-many simultaneous communication and networking are difficult to realize in the existing laser communication mode is solved.
The device provided by the application modulates the beacon laser by adopting the pseudo-random code, and receives, demodulates and despreads by adopting the PSD, thereby realizing the simultaneous tracking of the code division multiple access of n light spots, realizing the information interaction of the beacon optical spread spectrum communication, enabling a PSD beacon link to have spread spectrum gain and improving the detection sensitivity.
Suitable for use in applications where communication services are provided in remote locations.
Drawings
Fig. 1 is a schematic layout of a spatial laser communication network according to a first embodiment of the present application;
fig. 2 is a schematic structural diagram of a device for simultaneous tracking of multiple light spots in a cdma-based spatial laser communication networking according to a sixth embodiment of the present application;
FIG. 3 is a schematic flow chart of one proposed PSD position sensor communication and tracking hybrid multi-target position detection method according to an embodiment of the present application;
the system comprises a main optical transceiver 1, a slave optical transceiver A, a slave optical transceiver B, a slave optical transceiver C, a parabolic reflector optical antenna 5, an 800/1550nm broadband optical filter 6, a light splitting sheet 7, a PSD position sensor 8, a PSD position sensor target surface 9, a beacon laser 10, a beacon light modulation and servo measurement and control board 11, a spatial light coupler 12, an optical fiber circulator 13, a wavelength division multiplexing communication transmitter 14, a wavelength division multiplexing communication receiver 15, a communication baseband and photoelectric exchange board 16, a transimpedance gain amplifier 20 and a local codeNCO 21.
Detailed Description
The present application is further described with reference to the accompanying drawings:
the first embodiment is described with reference to fig. 1 to 3, and the first embodiment provides a method for simultaneously tracking multiple light spots in a space laser communication network based on code division multiple access, where the method includes:
the three slave optical transceivers surround the master optical transceiver 1, and the included angle between the three slave optical transceivers is 120 degrees; the three slave optical transceivers comprise a slave optical transceiver A2, a slave optical transceiver B3 and a slave optical transceiver C4;
the parabolic reflection optical antenna receives three groups of light beams sent by the optical transceiver, each group of light beams comprises a beacon light and a communication light, the parabolic reflection optical antenna converts all the received light beams into parallel light and then transmits the parallel light to the 800/1550nm broadband optical filter 6, the 800/1550nm broadband optical filter 6 reflects the three communication lights in the received parallel light to the spatial optical coupler 12, and the three beacon lights in the parallel light are transmitted and then transmitted by the beam splitter 7 and then transmitted to the target surface of the PSD position sensor 8;
the beacon laser 10 is used for emitting beacon light modulated by a code division multiple access method under the control of the beacon light modulation and servo measurement and control board 11; the emission beacon light is emitted to the light splitting sheet 7, refracted by the light splitting sheet 7, transmitted by the 800/1550nm broadband optical filter 6 and then incident to the parabolic reflector optical antenna 5;
the PSD position sensor 8 outputs an electric signal to a beacon light modulation and servo measurement and control board 11;
the beacon light modulation and servo measurement and control board 11 is used for resolving the received signal to obtain a resolving result, wherein the resolving result is the actual positions of light spots of the three beacon lights; and the three communication lights are accurately incident on the spatial light coupler 12 to realize stable communication by controlling the swing angle of the parabolic mirror in the parabolic mirror optical antenna 5 according to the calculation result.
Fig. 1 is a diagram showing a positional relationship between three slave optical transmitters and one master optical transmitter and receiver 1.
In a second embodiment, the present embodiment is described with reference to fig. 2, and the present embodiment further defines the method for simultaneously tracking multiple light spots in a space laser communication network based on code division multiple access provided in the first embodiment, where the beacon light modulation and servo measurement and control board 11 is used to calculate the received signal to obtain a settlement result, and the calculation process is implemented by software, and specifically includes:
three PRN codes of corresponding code patterns are generated by local codeNCO21 under the driving of frequency words, wherein the three PRN codes are respectively as follows: PRN1、PRN2And PRN3A step (2);
dividing the three PRN codes into three different phases, which are respectively: look ahead PRN1Code, Current PRN1Code, lag PRN1Code, look-ahead PRN2Code, Current PRN2Code, lag PRN2Code, look-ahead PRN3Code, Current PRN3Code and lag PRN3A step of coding;
associating said beacon signal x1 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal x1 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal x1 with said lead PRN3Code, Current PRN3Code and lag PRN3Performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN3Code, Current PRN3Code and lag PRN3Code proceeding mutuallyA step of correlation operation;
associating said beacon signal y1 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN3Code, Current PRN3Code and lag PRN3Performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN3Code, Current PRN3Code and lag PRN3Performing cross-correlation operation on the codes;
processing the results of the 12 cross-correlation operations by phase discrimination operation, and adjusting corresponding PRNs according to the processing results1、PRN2And PRN3A step of code setting the correlation peak value of the current code to 1 and acquiring rho values corresponding to three current PRN codes respectively; the rho is x1, x2, y1 and y2 corresponding to the three current codes;
the cross-correlation operation steps are specifically as follows: according to the following formula:
Figure BDA0003265459040000091
wherein, PnRepresents a correlation peak, Rsn,lnRepresenting the result of the correlation of the received signal of the nth PRN code sequence with the local signal, τ representing the phase difference before the code, csnRepresenting received signal light pseudo-code sequences, said connectionsThe received pseudo sequence codes are x1, x2, y1 and y2, clnRepresenting a local pseudo sequence code, wherein the local pseudo sequence code is a leading PRN code, a current PRN code and a lagging PRN code, T represents the correlation integral time of the code, and T represents the time;
respectively calculating the positions of three light spots on the target surface of the PSD position sensor 8 according to rho values corresponding to the three current PRN codes;
the calculating of the position of the light spot on the target surface of the PSD position sensor 8 specifically includes: according to the following formula:
Figure BDA0003265459040000092
and
Figure BDA0003265459040000093
wherein, DeltanxRepresenting the actual position of the centre of gravity of the spot, Δ, in the direction of the x-axisnyRepresenting the actual position of the centre of gravity of the spot in the direction of the y-axis, Pnx1、Pnx2、Pny1And Pny2Is said ρ and is the value of x1, x2, y1 and y2, respectively, corresponding to the current code, and L is the target surface half-size of the PSD position sensor 8.
The beacon signals x1, x2, y1 and y2 are obtained by processing the signal output by the PSD position sensor 8 by the beacon light modulation and servo control board 11, and the specific processing procedure is as follows: signals X1, X2, Y1 and Y2 output by the PSD position sensor 8 are amplified and converted into four voltage signals Ux1, Ux2, Uy1 and Uy2, and then the four voltage signals are converted into digital beacon signals X1, X2, Y1 and Y2 by an ADC conversion module.
The settlement method according to the present embodiment can be implemented by the technical means described in patent 2021109619182 applied at 8/20/2021.
In the third embodiment, the present embodiment is described with reference to fig. 2, and the present embodiment is further limited to the method for simultaneously tracking multiple spots in a space laser communication network based on code division multiple access provided in the first embodiment, where the optical fiber circulator 13 is a graded index optical fiber circulator.
In the fourth embodiment, the present embodiment is described with reference to fig. 2, and the present embodiment is further limited to the method for simultaneously tracking multiple spots in a space laser communication network based on code division multiple access provided in the first embodiment, wherein the optical fiber circulator 13 is a graded index optical fiber circulator.
In the fifth embodiment, the present embodiment is described with reference to fig. 2, and the present embodiment is further limited to the method for simultaneously tracking multiple light spots in a space laser communication network based on code division multiple access provided in the first embodiment, wherein the beacon optical modulation and servo control board simultaneously has a code division multiple access electrical signal output function, a PSD beacon optical position and beacon optical communication data resolving function, and a simple pendulum rotation angle control function.
Sixth embodiment, the present embodiment is described with reference to fig. 2, and the present embodiment provides an apparatus for simultaneous multi-spot tracking in a space laser communication network based on code division multiple access, the apparatus including:
three slave optical transceivers and a master optical transceiver 1; the three slave optical transceivers surround the main optical transceiver 1, and the included angle between the three slave optical transceivers is 120 degrees; the three slave optical transceivers comprise a slave optical transceiver A2, a slave optical transceiver B3 and a slave optical transceiver C4;
the main optical transceiver 1 includes: the system comprises a parabolic reflector optical antenna 5, an 800/1550nm broadband optical filter 6, a light splitting sheet 7, a beacon laser 10, a beacon light modulation and servo measurement and control board 11, a spatial light coupler 12, an optical fiber circulator 13, a wavelength division multiplexing communication transmitter 14, a wavelength division multiplexing de-multiplexing communication receiver 15 and a communication baseband and photoelectric exchange board 16;
the parabolic mirror optical antenna 5 includes: a rotating parabolic mirror;
the parabolic reflection optical antenna receives three groups of light beams sent by the optical transceiver, each group of light beams comprises a beacon light and a communication light, the parabolic reflection optical antenna converts all the received light beams into parallel light and then transmits the parallel light to the 800/1550nm broadband optical filter 6, the 800/1550nm broadband optical filter 6 reflects the three communication lights in the received parallel light to the spatial optical coupler 12, and the three beacon lights in the parallel light are transmitted and then transmitted by the beam splitter 7 and then transmitted to the target surface of the PSD position sensor 8;
the beacon laser 10 is used for emitting beacon light modulated by a code division multiple access method under the control of the beacon light modulation and servo measurement and control board 11; the emission beacon light is emitted to the light splitting sheet 7, refracted by the light splitting sheet 7, transmitted by the 800/1550nm broadband optical filter 6 and then incident to the parabolic reflector optical antenna 5; the emitted beacon light refracted by the spectroscope 7 can be coaxial with the beacon light incident on the spectroscope 7 through the 800/1550nm broadband filter 6.
The PSD position sensor 8 outputs an electric signal to a beacon light modulation and servo measurement and control board 11;
the beacon light modulation and servo measurement and control board 11 is used for resolving the received signal to obtain a resolving result, wherein the resolving result is the actual positions of light spots of the three beacon lights; and the three communication lights are accurately incident on the spatial light coupler 12 to realize tracking.
Fig. 2 is a schematic structural diagram of an apparatus according to the present embodiment. Among them, 10gbps1548.92nm communication light a and 10kcpsPRN1 beacon light are emitted from optical terminal a2, 10gbps1549.72nm communication light B and 10kcpsPRN 2 beacon light are emitted from optical terminal B3, and 10gbps1550.52nm communication light C and 10kcpsPRN beacon light are emitted from optical terminal C4. Fig. 9 shows a schematic diagram of the light spots of the three beams of beacon light impinging on the target surface of the PSD position sensor 8.
Seventh embodiment, the present embodiment is described with reference to fig. 2, and is further limited to the sixth embodiment, in which the device for simultaneously tracking multiple light spots in a space laser communication network based on code division multiple access is further provided, the beacon light modulation and servo control board 11 is used for resolving a received signal to obtain a settlement result, and is implemented by a software module embedded in the beacon light modulation and servo control board 11, where the software module includes:
three PRN codes of corresponding code patterns are generated by local codeNCO21 under the driving of frequency words, wherein the three PRN codes are respectively as follows: modules for PRN1, PRN2, and PRN 3;
dividing the three PRN codes into three different phases, which are respectively: a module for advancing the PRN1 code, the current PRN1 code, the lagging PRN1 code, the advancing PRN2 code, the current PRN2 code, the lagging PRN2 code, the advancing PRN3 code, the current PRN3 code, and the lagging PRN3 code;
means for cross-correlating said beacon signal x1 with said leading PRN1 code, said current PRN1 code, and said lagging PRN1 code;
means for cross-correlating said beacon signal x1 with said leading PRN2 code, said current PRN2 code, and said lagging PRN2 code;
means for cross-correlating said beacon signal x1 with said leading PRN3 code, said current PRN3 code, and said lagging PRN3 code;
means for cross-correlating said beacon signal x2 with said leading PRN1 code, said current PRN1 code, and said lagging PRN1 code;
means for cross-correlating said beacon signal x2 with said leading PRN2 code, said current PRN2 code, and said lagging PRN2 code;
means for cross-correlating said beacon signal x2 with said leading PRN3 code, said current PRN3 code, and said lagging PRN3 code;
means for cross-correlating said beacon signal y1 with said leading PRN1 code, said current PRN1 code, and said lagging PRN1 code;
means for cross-correlating said beacon signal y1 with said leading PRN2 code, said current PRN2 code, and said lagging PRN2 code;
means for cross-correlating said beacon signal y1 with said leading PRN3 code, said current PRN3 code, and said lagging PRN3 code;
means for cross-correlating said beacon signal y2 with said leading PRN1 code, said current PRN1 code, and said lagging PRN1 code;
means for cross-correlating said beacon signal y2 with said leading PRN2 code, said current PRN2 code, and said lagging PRN2 code;
means for cross-correlating said beacon signal y2 with said leading PRN3 code, said current PRN3 code, and said lagging PRN3 code;
processing the results of the 12 cross-correlation operations through phase discrimination operation, respectively adjusting corresponding PRN1, PRN2 and PRN3 codes according to the processing results to enable the value of the correlation peak of the current code to be 1, and acquiring rho values corresponding to three current PRN codes; the rho is x1, x2, y1 and y2 corresponding to the three current codes;
a module for calculating the positions of three light spots on the target surface 9 of the PSD position sensor according to the rho values corresponding to the three current PRN codes;
the calculating of the position of the light spot on the target surface 9 of the PSD position sensor specifically includes: according to the following formula:
Figure BDA0003265459040000121
Figure BDA0003265459040000122
wherein, DeltanxRepresenting the actual position of the centre of gravity of the spot, Δ, in the direction of the x-axisnyRepresenting the actual position of the centre of gravity of the spot in the direction of the y-axis, Pnx1、Pnx2、Pny1And Pny2Is said ρ and is the value of x1, x2, y1 and y2, respectively, corresponding to the current code, and L is the target surface half-size of the PSD position sensor 8.
In the eighth embodiment, the present embodiment is described with reference to fig. 2, and the present embodiment is further limited to the apparatus for simultaneous multi-spot tracking in a space laser communication network based on code division multiple access provided in the sixth embodiment, wherein the beam splitter 7 is a wavelength beam splitter.
The ninth embodiment is described with reference to fig. 2, and the present embodiment is further limited to the sixth embodiment in the device for simultaneous multi-spot tracking in a space laser communication network based on code division multiple access, wherein the optical fiber circulator 13 is a graded index optical fiber circulator.
In the tenth embodiment, the present embodiment is described with reference to fig. 2, and the present embodiment is further limited to the device for simultaneous multi-spot tracking in a space laser communication network based on a code division multiple access provided in the sixth embodiment, wherein the beacon optical modulation and servo control board simultaneously has an electrical signal output function of code division multiple access, a PSD beacon optical position and beacon optical communication data resolving function, and a simple pendulum rotation angle control function.
The eleventh embodiment is described with reference to fig. 1 to 3, and the present embodiment provides a specific example of the method for simultaneously tracking multiple light spots in a space laser communication network based on code division multiple access in the first embodiment, specifically:
the main optical transmitter-receiver 1 and the beacon optical laser of the slave optical transmitter-receiver select the wavelength of 800nm, and the PSD position sensor 8 selects a double-sided double-shaft model as: DL-100-7-KER, target surface size 10 x 10mm, dark current 80nA, responsivity 0.62A/W; the transimpedance gain amplifier 20 selects ADA4615-2 operational amplifier; AD7606 chips are selected for AD acquisition; the beacon light modulation and servo measurement and control board 11 adopts an FPGA EP4CE10 chip to perform modular operation.
The specific implementation steps are as follows:
step 1: the space laser communication networking consists of a master optical transceiver 11 and three slave optical transceivers, wherein the slave optical transceiver A2, the slave optical transceiver B3 and the slave optical transceiver C4 have functions of transmitting two light beams of communication light and beacon light, namely communication light A10Gbps1548.92nm, communication light B10Gbps 1549.72nm, communication light C10Gbps 1550.52nm, beacon light 10Kcps PRN1, beacon light 10Kcps PRN2 and beacon light 10Kcps PRN3, and the master optical transceiver 1 has functions of simultaneously receiving beacon light and communication light in three directions and simultaneously transmitting beacon light D10Kcps PRN4 and communication light D10Gbps 1551.72 nm;
step 2: the parabolic mirror antenna simultaneously receives communication light A, communication light B, communication light C and beacon light PRN1, beacon light PRN2 and beacon light PRN3 emitted by three nodes, and all light beams are output in parallel and are incident on the 800/1550nm broadband optical filter 6;
and step 3: the communication light is separated from the beacon light by the 800/1550nm broadband filter 6 so that the communication light is reflected by the filter onto the spatial light coupler 12, the beacon light PRN1, the beacon light PRN2, the beacon light PRN3 are transmitted through the 800/1550nm broadband filter 6, and the transmitted light beam is parallel to the parabolic mirror antenna output optical axis;
and 4, step 4: the transmitted beacon light and the received beacon light are separated by the light splitting sheet, so that the transmitted beacon light and the received beacon light are coaxial, the beacon light emission of the main optical transceiver 1 is completed through a parabolic reflector antenna, and the transmitted beacon light and the three-beam received beacon light adopt the same waveband and different pseudo-random coding modes, namely a code division multiple access beacon light modulation mode;
and 5: receiving beacon light irradiation on a target surface 9 of a PSD position sensor, simultaneously receiving three beacon light spots through one PSD, and distinguishing data and positions of received beacon light PRN1, beacon light PRN2 and beacon light PRN3 by adopting a multi-target position detection method combining communication and tracking;
step 6: ideally, each path of beacon light beam is coaxial with the communication light beam, and when the three light spots track at the zero point of the PSD at the same time, the communication light of three frequency points can be aligned and coupled to the spatial light coupler 12;
and 7: under the non-ideal condition, namely when the optical transmitter-receiver has a modulation error, namely the communication optical axis and the beacon optical axis have a deviation, the PSD firstly resolves the single-path beacon light by a multi-target position detection method combining communication and tracking, and then calculates the position of the beacon light spot by a PSD position resolving formula according to the receiving power of the single-path beacon light;
and 8: controlling the swing angle of the parabolic reflector through beacon modulation and a servo measurement and control board according to the PSD resolving position, and realizing simultaneous tracking and tracking of a plurality of beacon lights to a zero point or a certain position so that the communication lights can be aligned and coupled to the space optical coupler 12;
and step 9: the space optical coupler 12 couples the space light into the optical fiber, and the isolation of the communication light receiving and transmitting is realized through the optical fiber circulator 13;
step 10: the communication light emitted by the wavelength division multiplexing communication emitter 14 is incident to the public end through the emitting end optical fiber of the optical fiber circulator 13 to realize the emission of the communication light, meanwhile, the received communication light beam is incident to the receiving end through the public end of the optical fiber circulator 13, and the photoelectric conversion of the received communication light is realized through the wavelength division multiplexing receiver;
step 11: finally, the demodulation of the communication optical data and the modulation of the communication optical data of the main optical transceiver 1 are realized through the communication baseband and the photoelectric exchange board 16.
Through the steps, the simultaneous miss distance detection of the single PSD detector and the multi-spot code division multiple access is completed, and a solution is provided for link establishment and realization of one-to-three simultaneous laser communication.
The method and the device for simultaneously tracking multiple light spots of the space laser communication networking based on the code division multiple access are introduced in detail, the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; the technical solutions described in the above embodiments are examples of the scope of protection claimed in the present application, and the actual scope of protection also includes reasonable combinations of the technical features described in the above embodiments and reasonable substitutions that can be thought of by those skilled in the art. Meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A method for simultaneously tracking multiple light spots of a space laser communication network based on code division multiple addresses is characterized in that the method comprises the following steps:
the three slave optical transceivers surround the master optical transceiver (1) and form an included angle of 120 degrees with each other; the three slave optical transceivers comprise a slave optical transceiver A (2), a slave optical transceiver B (3) and a slave optical transceiver C (4);
the parabolic reflection optical antenna receives three groups of light beams sent by the optical transceiver, each group of light beams comprises a beacon light and a communication light, the parabolic reflection optical antenna converts all the received light beams into parallel light and then transmits the parallel light to the 800/1550nm broadband optical filter (6), the 800/1550nm broadband optical filter (6) reflects the three communication lights in the received parallel light to the spatial optical coupler (12), and transmits the three beacon lights in the parallel light to the target surface of the PSD position sensor (8) after transmitting the three beacon lights and then transmitting the beacon lights through the beam splitter (7);
the beacon laser (10) is used for emitting beacon light modulated by a code division multiple access method under the control of the beacon light modulation and servo measurement and control board (11); the emission beacon light is emitted to the light splitting sheet (7), refracted by the light splitting sheet (7), transmitted by the 800/1550nm broadband optical filter (6) and then incident to the parabolic reflector optical antenna (5);
the PSD position sensor (8) outputs an electric signal to the beacon light modulation and servo measurement and control board (11);
the beacon light modulation and servo measurement and control board (11) is used for resolving the received signals to obtain a resolving result, wherein the resolving result is the actual positions of light spots of the three beacon lights; and the method is also used for controlling the swing angle of a parabolic reflector in the parabolic reflector optical antenna (5) according to the calculation result, so that the three communication lights are accurately incident on the spatial light coupler (12), and stable communication is realized.
2. The method for simultaneously tracking multiple light spots of a space laser communication network based on Code Division Multiple Access (CDMA) according to claim 1, wherein the beacon light modulation and servo measurement and control board (11) is used for calculating the received signals to obtain settlement results, and the calculation is realized by software, and specifically comprises the following steps:
three PRN codes of corresponding code patterns are generated by local codeNCO (21) under the driving of frequency words, wherein the three PRN codes are respectively as follows: PRN1、PRN2And PRN3A step (2);
dividing the three PRN codes into three different phases, which are respectively: look ahead PRN1Code, Current PRN1Code, lag PRN1Code, look-ahead PRN2Code, Current PRN2Code, lag PRN2Code, look-ahead PRN3Code, code whenPre-PRN3Code and lag PRN3A step of coding;
associating said beacon signal x1 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal x1 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal x1 with said lead PRN3Code, Current PRN3Code and lag PRN3Performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN3Code, Current PRN3Code and lag PRN3Performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN2Code, Current PRN2Code and lag PRN2Performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN3Code, Current PRN3Code and lag PRN3Performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN1Code, Current PRN1Code and lag PRN1Performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN2Code, Current PRN2Code and lag PRN2Code proceeding mutuallyA step of correlation operation;
associating said beacon signal y2 with said lead PRN3Code, Current PRN3Code and lag PRN3Performing cross-correlation operation on the codes;
processing the results of the 12 cross-correlation operations by phase discrimination operation, and adjusting corresponding PRNs according to the processing results1、PRN2And PRN3A step of code setting the correlation peak value of the current code to 1 and acquiring rho values corresponding to three current PRN codes respectively; the rho is x1, x2, y1 and y2 corresponding to the three current codes;
respectively calculating the positions of three light spots on a target surface of a PSD position sensor (8) according to rho values corresponding to the three current PRN codes;
the position of the light spot on the target surface of the PSD position sensor (8) is calculated, and the method specifically comprises the following steps: according to the following formula:
Figure FDA0003265459030000021
Figure FDA0003265459030000022
wherein, DeltanxRepresenting the actual position of the centre of gravity of the spot, Δ, in the direction of the x-axisnyRepresenting the actual position of the centre of gravity of the spot in the direction of the y-axis, Pnx1、Pnx2、Pny1And Pny2Is the rho, and is the value of x1, x2, y1 and y2 corresponding to the current code, respectively, and L is the target surface half size of the PSD position sensor (8).
3. The method for simultaneous multi-spot tracking in a space laser communication network based on code division multiple access according to claim 1, wherein the beam splitter (7) is a wavelength beam splitter.
4. The method for simultaneous multi-spot tracking in a space laser communication network based on code division multiple access according to claim 1, wherein the optical fiber circulator (13) is a graded index optical fiber circulator.
5. The method according to claim 1, wherein the beacon optical modulation and servo control board has a code division multiple access electrical signal output function, a PSD beacon optical position and beacon optical communication data resolving function, and a simple pendulum rotation angle control function.
6. An apparatus for simultaneous multi-spot tracking in a space laser communication network based on Code Division Multiple Access (CDMA), the apparatus comprising:
three slave optical transceivers and a master optical transceiver (1); the three slave optical transceivers surround the main optical transceiver (1), and included angles between the three slave optical transceivers are 120 degrees; the three slave optical transceivers comprise a slave optical transceiver A (2), a slave optical transceiver B (3) and a slave optical transceiver C (4);
the main optical terminal (1) comprises: the system comprises a parabolic reflector optical antenna (5), an 800/1550nm broadband optical filter (6), a light splitting sheet (7), a beacon laser (10), a beacon light modulation and servo measurement and control board (11), a spatial light coupler (12), a fiber circulator (13), a wavelength division multiplexing communication transmitter (14), a wavelength division multiplexing communication receiver (15) and a communication baseband and photoelectric exchange board (16);
the parabolic mirror optical antenna (5) comprises: a rotating parabolic mirror;
the parabolic reflection optical antenna receives three groups of light beams sent by the optical transceiver, each group of light beams comprises a beacon light and a communication light, the parabolic reflection optical antenna converts all the received light beams into parallel light and then transmits the parallel light to the 800/1550nm broadband optical filter (6), the 800/1550nm broadband optical filter (6) reflects the three communication lights in the received parallel light to the spatial optical coupler (12), and transmits the three beacon lights in the parallel light to the target surface of the PSD position sensor (8) after transmitting the three beacon lights and then transmitting the beacon lights through the beam splitter (7);
the beacon laser (10) is used for emitting beacon light modulated by a code division multiple access method under the control of the beacon light modulation and servo measurement and control board (11); the emission beacon light is emitted to the light splitting sheet (7), refracted by the light splitting sheet (7), transmitted by the 800/1550nm broadband optical filter (6) and then incident to the parabolic reflector optical antenna (5);
the PSD position sensor (8) outputs an electric signal to the beacon light modulation and servo measurement and control board (11);
the beacon light modulation and servo measurement and control board (11) is used for resolving the received signals to obtain a resolving result, wherein the resolving result is the actual positions of light spots of the three beacon lights; and the three communication lights are accurately incident on the spatial light coupler (12) by controlling the swing angle of the parabolic mirror according to the calculation result.
7. The device for simultaneously tracking multiple light spots of a space laser communication network based on code division multiple access according to claim 6, wherein the beacon light modulation and servo measurement and control board (11) is used for resolving the received signal to obtain the settlement result, and is implemented by a software module embedded in the beacon light modulation and servo measurement and control board (11), and the software module comprises:
three PRN codes of corresponding code patterns are generated by local codeNCO (21) under the driving of frequency words, wherein the three PRN codes are respectively as follows: PRN1、PRN2And PRN3The module of (1);
dividing the three PRN codes into three different phases, which are respectively: look ahead PRN1Code, Current PRN1Code, lag PRN1Code, look-ahead PRN2Code, Current PRN2Code, lag PRN2Code, look-ahead PRN3Code, Current PRN3Code and lag PRN3A module of code;
associating said beacon signal x1 with said lead PRN1Code, Current PRN1Code and lag PRN1A module for performing cross-correlation operation on the codes;
sending the beacon messageNumber x1 with the lead PRN2Code, Current PRN2Code and lag PRN2A module for performing cross-correlation operation on the codes;
associating said beacon signal x1 with said lead PRN3Code, Current PRN3Code and lag PRN3A module for performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN1Code, Current PRN1Code and lag PRN1A module for performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN2Code, Current PRN2Code and lag PRN2A module for performing cross-correlation operation on the codes;
associating said beacon signal x2 with said lead PRN3Code, Current PRN3Code and lag PRN3A module for performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN1Code, Current PRN1Code and lag PRN1A module for performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN2Code, Current PRN2Code and lag PRN2A module for performing cross-correlation operation on the codes;
associating said beacon signal y1 with said lead PRN3Code, Current PRN3Code and lag PRN3A module for performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN1Code, Current PRN1Code and lag PRN1A module for performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN2Code, Current PRN2Code and lag PRN2A module for performing cross-correlation operation on the codes;
associating said beacon signal y2 with said lead PRN3Code, Current PRN3Code and lag PRN3A module for performing cross-correlation operation on the codes;
the 12 cross-correlation operation nodes through phase discriminationProcessing the fruits, and respectively adjusting corresponding PRNs according to the processing results1、PRN2And PRN3A step of code setting the correlation peak value of the current code to 1 and acquiring rho values corresponding to three current PRN codes respectively; the rho is x1, x2, y1 and y2 corresponding to the three current codes;
a module for calculating the positions of three light spots on the target surface of the PSD position sensor (8) according to the rho values corresponding to the three current PRN codes;
the position of the light spot on the target surface of the PSD position sensor (8) is calculated, and the method specifically comprises the following steps: according to the following formula:
Figure FDA0003265459030000051
Figure FDA0003265459030000052
wherein, DeltanxRepresenting the actual position of the centre of gravity of the spot, Δ, in the direction of the x-axisnyRepresenting the actual position of the centre of gravity of the spot in the direction of the y-axis, Pnx1、Pnx2、Pny1And Pny2Is the rho, and is the value of x1, x2, y1 and y2 corresponding to the current code, respectively, and L is the target surface half size of the PSD position sensor (8).
8. The device for simultaneous multi-spot tracking in a space laser communication network based on code division multiple access according to claim 6, wherein the beam splitter (7) is a wavelength beam splitter.
9. The device for simultaneous multi-spot tracking in a space laser communication network based on code division multiple access according to claim 6, wherein the optical fiber circulator (13) is a graded index optical fiber circulator.
10. The device according to claim 6, wherein the beacon light modulation and servo control board has a code division multiple access electrical signal output function, a PSD beacon light position and beacon light communication data resolving function, and a simple pendulum rotation angle control function.
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