CN113965260B - Space laser communication networking multi-spot simultaneous tracking method and device based on code division multiple access - Google Patents
Space laser communication networking multi-spot simultaneous tracking method and device based on code division multiple access Download PDFInfo
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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
- 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
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- 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
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Abstract
A method and a device for simultaneously tracking multiple light spots of a space laser communication networking based on code division multiple access relate to the field of space laser communication. Aiming at the problems that the current communication laser beam has smaller divergence angle, and 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 provides a space laser communication networking multi-spot simultaneous tracking method and device based on code division multiple access, comprising the following steps: the slave optical transceiver A, the slave optical transceiver B, the slave optical transceiver C and the master optical transceiver; the main optical transceiver comprises: 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 demultiplexing communication receiver, a communication baseband and a photoelectric exchange board; the beacon light position is calculated through a PSD position sensor; the servo measurement and control board controls the swinging angle of the parabolic reflector according to the resolving result of the beacon modulation; is suitable for the application of providing communication service in remote areas.
Description
Technical Field
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
The satellite internet communication constructs a network which fully covers the earth by transmitting a certain number of satellite groups, and provides communication service for remote areas such as ocean, desert and the like which are not covered by the ground base station. At present, the information transmission of the satellite Internet is mainly limited by conditions such as carrier frequency, power and the like by means of microwave communication, and the transmission rate of the microwave communication between satellites is in the order of hundred megabits per second, so that the requirement of the real-time transmission of the large-capacity data of the 5G network can not 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 network, satellite communication and the like. However, because the divergence angle of the communication laser beam is smaller, 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 the laser high-speed data transmission of multiple nodes in the spatial information network, researches on related technologies and methods are carried out at home and abroad, but related research results are less.
Jiang Huilin et al propose a one-to-many simultaneous space laser communication method based on a paraboloid of revolution optical principle (journal: china laser, 2015, 42 volume, 4 th period, 0405008), which realizes multi-beam simultaneous tracking under the condition that beacon light corresponds to a tracking camera one by one, and can realize one-to-many simultaneous laser communication in a large space. The system has been developed for 8 years, and a one-to-two outfield dynamic test and a one-to-three laboratory demonstration verification have been realized. However, due to the limitation of the tracking principle and structure of a plurality of beacon beams, although the optical antenna subsystem and the relay optical analysis system can receive the multiple beams in a combined way, the subsequent light receiving and transmitting subsystem still needs an independent beacon tracking camera to be in one-to-one correspondence with the externally input beacon beams, so that each beam can be tracked independently. That is, a single tracking camera cannot track a plurality of light spots to the same tracking point at the same time, so that the linkage effect of a follow-up servo control system is limited, and the defect of poor tracking effect is caused.
Meanwhile, errors are easy to generate in the process of installing and adjusting the optical transceiver, so that the phenomenon that communication light and beacon light are not coaxial is caused, namely, when the beacon light is tracked to the target of a tracking camera, the received communication power is not the maximum point of communication light reception at the moment, and unnecessary energy loss of the received communication light is caused. Aiming at the problem, tian Mingan et al propose a communication and tracking composite method and device based on a PSD position sensor (the application date of acceptance number 2021109619182 is 2021, 8 and 20), and disclose a method for converting a received light beam into an electric signal by adopting a PSD position detector, amplifying and converting the electric signal into a piezoelectric signal to enter an AD acquisition module, and respectively outputting a demodulation result of light beam modulation information and a light beam gravity center position, thereby realizing the purpose of compounding communication and tracking in a space laser system, avoiding the step of realizing real-time tracking of beacon light by communication light, and avoiding the problem that the communication light cannot be completely aligned on a target surface of the detector because the sensor is installed and the detector is not coaxial in the equipment installation process.
Disclosure of Invention
Aiming at the problems that the prior communication laser beam has smaller divergence angle, the one-to-many simultaneous communication of broadcasting 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 art, provides a space laser communication networking multi-facula simultaneous tracking method and device based on code division multiple access, and specifically comprises the following steps:
a method for simultaneously tracking multiple light spots of a space laser communication network based on code multiple address division comprises the following steps:
the three slave optical end machines surround the main optical end machine, and the included angle between the three slave optical end machines is 120 degrees; the three slave optical terminators comprise a slave optical terminator A, a slave optical terminator B and a slave optical terminator C;
the parabolic reflection optical antenna receives three groups of light beams sent by the optical transceiver, each group of light beams comprises a beam of beacon light and a beam of communication light, the parabolic reflection optical antenna converts all the received light beams into parallel light and then sends the parallel light to the 800/1550nm broadband filter, the 800/1550nm broadband filter reflects three beams of communication light in the received parallel light to the space optical coupler, and the three beams of beacon light in the parallel light are transmitted and then sent to the target surface of the PSD position sensor after being transmitted by the light splitting sheet;
the beacon laser is used for transmitting the transmitted beacon light modulated by the method of code division multiple access under the control of the beacon light modulation and servo measurement and control board; the emitted beacon light is emitted to the light splitting sheet, refracted by the light splitting sheet, transmitted by the 800/1550nm broadband 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, and the resolving result is the actual positions of light spots of three beacon lights; and the three communication lights are precisely incident on the space optical coupler to realize stable communication by controlling the swinging angle of the parabolic reflector in the parabolic reflector optical antenna according to the resolving result.
Further, the beacon light modulation and servo measurement and control board is used for resolving the received signals to obtain a settlement result, and the settlement result is realized through software, and the specific resolving process is as follows:
three PRN codes corresponding to the code pattern are generated by the local codeNCO under the driving of the frequency word, and are respectively: PRN (PRN) 1 、PRN 2 And PRN 3 Is carried out by the steps of (a);
the three PRN codes are respectively divided into three different phases: advanced PRN 1 Code, current PRN 1 Code, hysteresis PRN 1 Code, advanced PRN 2 Code, current PRN 2 Code, hysteresis PRN 2 Code, advanced PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 A step of coding;
the beacon signal x1 is combined with the advanced PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 Performing cross correlation operation on codes;
the beacon signal x1 is combined with the advanced PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 Performing cross correlation operation on codes;
the beacon signal x1 is combined with the advanced PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 Performing cross correlation operation on codes;
the beacon signal x2 is combined with the advanced PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 Performing cross correlation operation on codes;
the beacon signal x2 is combined with the advanced PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 Performing cross correlation operation on codes;
the beacon signal x2 is combined with the advanced PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 Performing cross correlation operation on codes;
the beacon signal y1 is combined with the leading PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 Performing cross correlation operation on codes;
the beacon signal y1 is combined with the leading PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 Performing cross correlation operation on codes;
the beacon signal y1 is combined with the leading PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 Performing cross correlation operation on codes;
the beacon signal y2 is combined with the leading PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 Performing cross correlation operation on codes;
the beacon signal y2 is combined with the leading PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 Performing cross correlation operation on codes;
the beacon signal y2 is combined with the leading PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 Performing cross correlation operation on codes;
processing the results of the 12 cross-correlation operations through phase discrimination operation, and respectively adjusting corresponding PRNs according to the processing results 1 、PRN 2 And PRN 3 The code, make the value of the correlation peak of the current code be 1, and gather the three current PRN code and correspond to the step of the value of rho separately; the rho is x1, x2, y1 and y2 corresponding to three current codes;
respectively calculating the positions of three light spots on the target surface of the PSD position sensor according to the values of rho corresponding to the three current PRN codes;
the position of the light spot on the target surface of the PSD position sensor is calculated, and the position is specifically: according to the following formula:
wherein delta is nx Representing the actual position of the centre of gravity of the light spot in the x-axis direction, delta ny Representing the actual position of the center of gravity of the light spot in the y-axis direction, P nx1 、P nx2 、P ny1 And P ny2 And L is the half size of the target surface of the PSD position sensor, wherein rho is the value of x1, x2, y1 and y2 corresponding to the current code respectively.
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 has the functions of outputting the electric signals of the code division multiple access, resolving the data of the PSD beacon light position and the beacon light communication and controlling the single pendulum rotation angle.
A device for simultaneous tracking of multiple spots in a spatial laser communication network based on code division multiple access, the device comprising:
three slave optical terminals and one master optical terminal; the three slave optical end machines surround the main optical end machine, and the included angle between the three slave optical end machines is 120 degrees; the three slave optical terminators comprise a slave optical terminator A, a slave optical terminator B and a slave optical terminator C;
the main optical transceiver comprises: the system comprises a parabolic reflector optical antenna, an 800/1550nm broadband optical filter, a beam splitter, a beacon laser, a beacon light modulation and servo measurement and control board, a space optical coupler, an optical fiber circulator, a wavelength division multiplexing communication transmitter, a wavelength division multiplexing communication receiver, 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 beam of beacon light and a beam of communication light, the parabolic reflection optical antenna converts all the received light beams into parallel light and then sends the parallel light to the 800/1550nm broadband filter, the 800/1550nm broadband filter reflects three beams of communication light in the received parallel light to the space optical coupler, and the three beams of beacon light in the parallel light are transmitted and then sent to the target surface of the PSD position sensor after being transmitted by the light splitting sheet;
the beacon laser is used for transmitting the transmitted beacon light modulated by the method of code division multiple access under the control of the beacon light modulation and servo measurement and control board; the emitted beacon light is emitted to the light splitting sheet, refracted by the light splitting sheet, transmitted by the 800/1550nm broadband filter and then incident to the parabolic reflector optical antenna; the emitted beacon light refracted by the beam splitter can be coaxial with the beacon light incident to the beam splitter through the 800/1550nm broadband 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, and the resolving result is the actual positions of light spots of three beacon lights; and the three communication lights are precisely incident on the space optical coupler to realize tracking by controlling the swinging angle of the parabolic reflector according to the resolving result.
Further, the beacon light modulation and servo measurement and control board is used for resolving the received signals to obtain a settlement result, and the settlement result is realized through a software module embedded in the beacon light modulation and servo measurement and control board, and the software module comprises:
three PRN codes corresponding to the code pattern are generated by the local codeNCO under the driving of the frequency word, and are respectively: modules of PRN1, PRN2, and PRN 3;
the three PRN codes are respectively divided into three different phases: a module of a leading PRN1 code, a current PRN1 code, a lagging PRN1 code, a leading PRN2 code, a current PRN2 code, a lagging PRN2 code, a leading PRN3 code, a current PRN3 code, and a lagging PRN3 code.
A module for performing a cross-correlation operation on the beacon signal x1 and the leading PRN1 code, the current PRN1 code, and the lagging PRN1 code;
a module for performing a cross-correlation operation on the beacon signal x1 and the leading PRN2 code, the current PRN2 code, and the lagging PRN2 code;
a module for performing a cross-correlation operation on the beacon signal x1 and the leading PRN3 code, the current PRN3 code, and the lagging PRN3 code;
a module for performing a cross-correlation operation on the beacon signal x2 and the leading PRN1 code, the current PRN1 code, and the lagging PRN1 code;
a module for performing a cross-correlation operation on the beacon signal x2 and the leading PRN2 code, the current PRN2 code, and the lagging PRN2 code;
a module for performing a cross-correlation operation on the beacon signal x2 and the leading PRN3 code, the current PRN3 code, and the lagging PRN3 code;
a module for performing a cross-correlation operation on the beacon signal y1 and the leading PRN1 code, the current PRN1 code, and the lagging PRN1 code;
a module for performing a cross-correlation operation on the beacon signal y1 and the leading PRN2 code, the current PRN2 code, and the lagging PRN2 code;
a module for performing a cross-correlation operation on the beacon signal y1 and the leading PRN3 code, the current PRN3 code, and the lagging PRN3 code;
a module for performing a cross-correlation operation on the beacon signal y2 and the leading PRN1 code, the current PRN1 code, and the lagging PRN1 code;
a module for performing a cross-correlation operation on the beacon signal y2 and the leading PRN2 code, the current PRN2 code, and the lagging PRN2 code;
a module for performing a cross-correlation operation on the beacon signal y2 and the leading PRN3 code, the current PRN3 code, and the 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, enabling the value of the correlation peak of the current code to be 1, and collecting the values of rho corresponding to the three current PRN codes respectively; the rho is x1, x2, y1 and y2 corresponding to three current codes;
the module is used for respectively calculating the positions of three light spots on the target surface of the PSD position sensor according to the values of rho corresponding to the three current PRN codes;
the position of the light spot on the target surface of the PSD position sensor is calculated, and the position is specifically: according to the following formula:
wherein delta is nx Representing the actual position of the centre of gravity of the light spot in the x-axis direction, delta ny Representing the actual position of the center of gravity of the light spot in the y-axis direction, P nx1 、P nx2 、P ny1 And P ny2 And L is the half size of the target surface of the PSD position sensor, wherein rho is the value of x1, x2, y1 and y2 corresponding to the current code respectively.
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 has the functions of outputting the electric signals of the code division multiple access, resolving the data of the PSD beacon light position and the beacon light communication and controlling the single pendulum rotation angle.
The beneficial point of the application lies in:
the method and the device for combining communication and tracking based on the PSD position sensor in the PSD position sensor background technology and the one-to-many simultaneous space laser communication method based on the paraboloid of revolution optical principle in the paraboloid of revolution mirror optical antenna background technology are combined in a combined invention mode, the problems that communication laser beams are small in divergence angle, one-to-many simultaneous communication of broadcasting type is difficult to realize, the requirement of simultaneous interaction transmission of satellite internet multipoint information cannot be met, meanwhile, the problem that communication light cannot be completely aligned on a target surface of a detector due to the fact that the sensor is arranged in the equipment installation process is solved, and the purpose of combining communication and tracking in a space laser system is realized while one-to-many simultaneous communication and networking are realized.
According to the method provided by the application, the PSD position sensor is used for communication and tracking composite multi-target position detection, so that the simultaneous detection of multi-beam off-target quantity of a single detector is realized, the defect that a single tracking camera cannot simultaneously track a plurality of light spots to the same tracking point is overcome, and the linkage effect of a follow-up servo control system is improved; the requirement of capturing and aligning a plurality of optical axes of a laser communication system at the same time is met; the method solves the problem that the current laser communication mode is difficult to realize one-to-many simultaneous communication and networking.
The device provided by the application adopts pseudo-random code to modulate the beacon laser, adopts PSD to receive and demodulate and despread, realizes the simultaneous tracking of the code division multiple access of n light spots, realizes the information interaction of the beacon light spread spectrum communication, ensures that a PSD beacon link has spread spectrum gain, and improves the detection sensitivity.
Is suitable for the application of providing communication service in remote areas.
Drawings
Fig. 1 is a schematic layout diagram of a spatial laser communication network according to a first embodiment of the present application;
fig. 2 is a schematic structural diagram of a spatial laser communication networking multi-spot simultaneous tracking device based on code division multiple access in a sixth embodiment of the present application;
FIG. 3 is a schematic flow chart of a combined PSD position sensor communication and tracking multi-target position detection method according to an embodiment of the present application;
the optical transmitter and receiver comprises a master optical terminal 1, a slave optical terminal 2, a slave optical terminal 3, a slave optical terminal B, a slave optical terminal C, a parabolic reflector optical antenna 5, a 800/1550nm broadband optical filter 6, a beam splitter 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 space optical 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 trans-impedance gain amplifier 20 and a local codeNCO 21.
Detailed Description
The application is further described below with reference to the accompanying drawings:
an embodiment one, referring to fig. 1 to 3, provides a method for simultaneously tracking multiple light spots in a spatial laser communication network based on code multiple address division, where the method is as follows:
the three slave optical end machines surround the main optical end machine 1, and the included angle between the three slave optical end machines is 120 degrees; the three slave optical terminators comprise a slave optical terminator A2, a slave optical terminator B3 and a slave optical terminator C4;
the parabolic reflection optical antenna receives three groups of light beams sent by the optical transceiver, each group of light beams comprises a beam of beacon light and a beam of communication light, the parabolic reflection optical antenna converts all the received light beams into parallel light and then sends the parallel light to the 800/1550nm broadband filter 6, the 800/1550nm broadband filter 6 reflects three beams of communication light in the received parallel light to the space optical coupler 12, and the three beams of beacon light in the parallel light are transmitted and then sent to the target surface of the PSD position sensor 8 after being transmitted by the light splitting sheet 7;
the beacon laser 10 is used for emitting emitted 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 emitted beacon light is emitted to the light splitting sheet 7, refracted by the light splitting sheet 7, transmitted by the 800/1550nm broadband 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 three beacon lights; and the three communication lights are precisely incident on the space optical coupler 12 to realize stable communication by controlling the swinging angle of the parabolic reflector in the parabolic reflector optical antenna 5 according to the resolving result.
Fig. 1 is a diagram showing the positional relationship between three slave optical terminals and one master optical terminal 1.
In a second embodiment, referring to fig. 2 for explaining the present embodiment, the present embodiment is further defined to a method for simultaneously tracking multiple light spots in a spatial laser communication network based on code multiple address division provided in the first embodiment, where the beacon light modulation and servo measurement and control board 11 is configured to calculate a received signal to obtain a settlement result, and the settlement result is implemented by software, and a specific calculation process is as follows:
three PRN codes corresponding to the code pattern are generated by the local codeNCO21 under the driving of the frequency word, respectively: PRN (PRN) 1 、PRN 2 And PRN 3 Is carried out by the steps of (a);
the three PRN codes are respectively divided into three different phases: advanced PRN 1 Code, current PRN 1 Code, hysteresis PRN 1 Code, advanced PRN 2 Code, current PRN 2 Code, hysteresis PRN 2 Code, advanced PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 A step of coding;
the beacon signal x1 is combined with the advanced PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 Performing cross correlation operation on codes;
the beacon signal x1 is combined with the advanced PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 Performing cross correlation operation on codes;
the beacon signal x1 is combined with the advanced PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 Performing cross correlation operation on codes;
the beacon signal x2 is combined with the advanced PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 Performing cross correlation operation on codes;
the beacon signal x2 is combined with the advanced PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 Performing cross correlation operation on codes;
the beacon signal x2 is combined with the advanced PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 Performing cross correlation operation on codes;
the beacon signal y1 is combined with the leading PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 Performing cross correlation operation on codes;
the beacon signal y1 is combined with the leading PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 Performing cross correlation operation on codes;
the beacon signal y1 is combined with the leading PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 Performing cross correlation operation on codes;
the beacon signal y2 is combined with the leading PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 Performing cross correlation operation on codes;
the beacon signal y2 is combined with the leading PRN 2 Code, whenFront PRN 2 Code and hysteresis PRN 2 Performing cross correlation operation on codes;
the beacon signal y2 is combined with the leading PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 Performing cross correlation operation on codes;
processing the results of the 12 cross-correlation operations through phase discrimination operation, and respectively adjusting corresponding PRNs according to the processing results 1 、PRN 2 And PRN 3 The code, make the value of the correlation peak of the current code be 1, and gather the three current PRN code and correspond to the step of the value of rho separately; the rho is x1, x2, y1 and y2 corresponding to three current codes;
the cross-correlation operation steps specifically include: according to the following formula:
wherein P is n Represents a correlation peak, R sn,ln Representing the correlation result of the received signal of the nth PRN code sequence with the local signal, τ representing the phase difference before the code, c sn Representing the received signal light pseudo code sequence, wherein the received pseudo sequence code is x1, x2, y1 and y2, c ln Representing a local pseudo code sequence, wherein the local pseudo sequence code is a leading PRN code, a current PRN code and a lagging PRN code, T represents the correlation integration time of the codes, 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 the values of rho 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 specifically as follows: according to the following formula:
Wherein, the liquid crystal display device comprises a liquid crystal display device,Δ nx representing the actual position of the centre of gravity of the light spot in the x-axis direction, delta ny Representing the actual position of the center of gravity of the light spot in the y-axis direction, P nx1 、P nx2 、P ny1 And P ny2 And L is the half size of the target surface of the PSD position sensor 8, wherein rho is the value of x1, x2, y1 and y2 corresponding to the current code respectively.
The beacon signals x1, x2, y1 and y2 are obtained by processing signals output by the PSD position sensor 8 by the beacon light modulation and servo measurement and control board 11, and the specific processing process is as follows: the 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 through an ADC conversion module.
The settlement method according to the present embodiment can be realized by the method described in patent application No. 2021109619182 of 20, 8/2021.
In a third embodiment, referring to fig. 2, the present embodiment is further limited to the method for simultaneously tracking multiple light spots in a spatial 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 a fourth embodiment, referring to fig. 2, the present embodiment is further limited to the method for simultaneously tracking multiple light spots in a spatial 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 a fifth embodiment, referring to fig. 2, the present embodiment is further defined by the method for simultaneously tracking multiple light spots in a spatial laser communication network based on code division multiple access provided in the first embodiment, where the beacon light modulation and the servo control board simultaneously have an electric signal output function of code division multiple access, a function of resolving PSD beacon light position and beacon light communication data, and a function of controlling a single swing rotation angle.
In a sixth embodiment, referring to fig. 2 for illustrating the present embodiment, the present embodiment provides a device for simultaneously tracking multiple light spots in a spatial laser communication network based on code multiple address division, where the device includes:
three slave optical terminals and one master optical terminal 1; the three slave optical end machines surround the main optical end machine 1, and the included angle between the three slave optical end machines is 120 degrees; the three slave optical terminators comprise a slave optical terminator A2, a slave optical terminator B3 and a slave optical terminator C4;
the main optical transceiver 1 includes: the system comprises a parabolic reflector optical antenna 5, an 800/1550nm broadband optical filter 6, a beam splitter 7, a beacon laser 10, a beacon light modulation and servo measurement and control board 11, a space optical coupler 12, an optical 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 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 beam of beacon light and a beam of communication light, the parabolic reflection optical antenna converts all the received light beams into parallel light and then sends the parallel light to the 800/1550nm broadband filter 6, the 800/1550nm broadband filter 6 reflects three beams of communication light in the received parallel light to the space optical coupler 12, and the three beams of beacon light in the parallel light are transmitted and then sent to the target surface of the PSD position sensor 8 after being transmitted by the light splitting sheet 7;
the beacon laser 10 is used for emitting emitted 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 emitted beacon light is emitted to the light splitting sheet 7, refracted by the light splitting sheet 7, transmitted by the 800/1550nm broadband filter 6 and then incident to the parabolic reflector optical antenna 5; the emitted beacon light refracted by the light-splitting sheet 7 can be coaxial with the beacon light incident on the light-splitting sheet 7 through the 800/1550nm broadband filter 6.
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 three beacon lights; and the three communication lights are precisely incident on the space optical coupler 12 to realize tracking by controlling the swinging angle of the parabolic reflector according to the resolving result.
Referring to fig. 2, a schematic structural diagram of an apparatus according to this embodiment is shown. Wherein 10Gbps1548.92nm of communication light A and 10kcpsPRN1 beacon light are transmitted from optical terminal A2, 10Gbps1549.72nm of communication light B and 10Kcps PRN2 beacon light are transmitted from optical terminal B3, and 10Gbps1550.52nm of communication light C and 10 kccps PRN beacon light are transmitted from optical terminal C4. In the figure, 9 shows a schematic view of a spot of three beams of beacon light impinging on the target surface of the PSD position sensor 8.
In a seventh embodiment, referring to fig. 2, the present embodiment is further defined to a device for simultaneously tracking multiple light spots in a spatial laser communication network based on code multiple address division provided in the sixth embodiment, where the beacon light modulation and servo measurement and control board 11 is configured to calculate a received signal to obtain a settlement result, and the settlement result is implemented by a software module embedded in the beacon light modulation and servo measurement and control board 11, where the software module includes:
three PRN codes corresponding to the code pattern are generated by the local codeNCO21 under the driving of the frequency word, respectively: modules of PRN1, PRN2, and PRN 3;
the three PRN codes are respectively divided into three different phases: a module of a leading PRN1 code, a current PRN1 code, a lagging PRN1 code, a leading PRN2 code, a current PRN2 code, a lagging PRN2 code, a leading PRN3 code, a current PRN3 code, and a lagging PRN3 code.
A module for performing a cross-correlation operation on the beacon signal x1 and the leading PRN1 code, the current PRN1 code, and the lagging PRN1 code;
a module for performing a cross-correlation operation on the beacon signal x1 and the leading PRN2 code, the current PRN2 code, and the lagging PRN2 code;
a module for performing a cross-correlation operation on the beacon signal x1 and the leading PRN3 code, the current PRN3 code, and the lagging PRN3 code;
a module for performing a cross-correlation operation on the beacon signal x2 and the leading PRN1 code, the current PRN1 code, and the lagging PRN1 code;
a module for performing a cross-correlation operation on the beacon signal x2 and the leading PRN2 code, the current PRN2 code, and the lagging PRN2 code;
a module for performing a cross-correlation operation on the beacon signal x2 and the leading PRN3 code, the current PRN3 code, and the lagging PRN3 code;
a module for performing a cross-correlation operation on the beacon signal y1 and the leading PRN1 code, the current PRN1 code, and the lagging PRN1 code;
a module for performing a cross-correlation operation on the beacon signal y1 and the leading PRN2 code, the current PRN2 code, and the lagging PRN2 code;
a module for performing a cross-correlation operation on the beacon signal y1 and the leading PRN3 code, the current PRN3 code, and the lagging PRN3 code;
a module for performing a cross-correlation operation on the beacon signal y2 and the leading PRN1 code, the current PRN1 code, and the lagging PRN1 code;
a module for performing a cross-correlation operation on the beacon signal y2 and the leading PRN2 code, the current PRN2 code, and the lagging PRN2 code;
a module for performing a cross-correlation operation on the beacon signal y2 and the leading PRN3 code, the current PRN3 code, and the 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, enabling the value of the correlation peak of the current code to be 1, and collecting the values of rho corresponding to the three current PRN codes respectively; the rho is x1, x2, y1 and y2 corresponding to three current codes;
the module is used for respectively calculating the positions of three light spots on the target surface 9 of the PSD position sensor according to the values of rho corresponding to the three current PRN codes;
the position of the light spot on the target surface 9 of the PSD position sensor is calculated specifically as follows: according to the following formula:
wherein delta is nx Representing the actual position of the centre of gravity of the light spot in the x-axis direction, delta ny Representing the actual position of the center of gravity of the light spot in the y-axis direction, P nx1 、P nx2 、P ny1 And P ny2 And L is the half size of the target surface of the PSD position sensor 8, wherein rho is the value of x1, x2, y1 and y2 corresponding to the current code respectively.
In the eighth embodiment, referring to fig. 2, the present embodiment is further limited to the device for simultaneously tracking multiple light spots in a spatial laser communication network based on code division multiple access provided in the sixth embodiment, and the light splitting sheet 7 is a wavelength light splitting sheet.
In the ninth embodiment, referring to fig. 2, the present embodiment is further limited to the device for simultaneously tracking multiple light spots in a spatial laser communication network based on code division multiple access provided in the sixth embodiment, and the optical fiber circulator 13 is a graded index optical fiber circulator.
In a tenth embodiment, referring to fig. 2, the present embodiment is further defined by the device for simultaneously tracking multiple light spots in a spatial laser communication network based on code division multiple access provided in the sixth embodiment, where the beacon light modulation and the servo control board simultaneously have an electrical signal output function of code division multiple access, a function of resolving PSD beacon light position and beacon light communication data, and a function of controlling a single swing rotation angle.
An eleventh embodiment is described with reference to fig. 1 to 3, where the present embodiment provides a specific example of a method for simultaneously tracking multiple light spots in a spatial laser communication network based on code multiple address according to the first embodiment, and the specific example is:
the main optical transceiver 1 and the beacon optical lasers of the secondary optical transceiver select wavelength 800nm, and the PSD position sensor 8 selects double-sided double-shaft models as follows: DL-100-7-KER, the target surface size is 10 x 10mm, the dark current is 80nA, and the responsivity is 0.62A/W; ADA4615-2 operational amplifier is selected as the transimpedance gain amplifier 20; an AD7606 chip is selected for AD acquisition; the beacon light modulation and servo measurement and control board 11 adopts an FPGA EP4CE10 chip to carry out modularized operation.
The specific implementation steps are as follows:
step 1: the space laser communication networking comprises a main optical terminal 11 and three slave optical terminals, wherein the slave optical terminal A2, the slave optical terminal B3 and the slave optical terminal C4 have the functions of transmitting 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, the main optical terminal 1 has the functions of simultaneously receiving the beacon light and the communication light in three directions and simultaneously transmitting the beacon light D10kcps PRN4 and the communication light D10Gbps 1551.72 nm;
step 2: the parabolic reflector antenna receives communication light A, communication light B, communication light C, beacon light PRN1, beacon light PRN2 and beacon light PRN3 transmitted by three nodes at the same time, outputs all light beams in parallel, and is incident on a 800/1550nm broadband filter 6;
step 3: separating the communication light from the beacon light by the 800/1550nm broadband filter 6, so that the communication light is reflected to the spatial light coupler 12 through the filter, the beacon light PRN1, the beacon light PRN2 and the beacon light PRN3 penetrate the 800/1550nm broadband filter 6, and the transmitted light beams are parallel to the output optical axis of the parabolic reflector antenna;
step 4: the light splitting sheet separates the emitted and received beacon light, so that the emitted beacon light and the received beacon light are coaxial, the beacon light emission of the main optical transceiver 1 is completed through the parabolic reflector antenna, and the emitted beacon light and the three received beacon light adopt the same wave band and different pseudo-random coding modes, namely the beacon light modulation mode of code division multiple access;
step 5: receiving beacon light to irradiate on a target surface 9 of a PSD position sensor, simultaneously receiving three beacon light spots through one PSD, and distinguishing received beacon light PRN1, beacon light PRN2, beacon light PRN3 data and positions by adopting a communication and tracking composite multi-target position detection method;
step 6: ideally, each path of beacon light beam is coaxial with the communication light beam, so that when three light spots are tracked at the PSD zero point simultaneously, the alignment and coupling of communication light of three frequency points to the space optical coupler 12 can be realized;
step 7: under the non-ideal condition, namely when an optical terminal machine has an adjustment error, namely when a communication optical axis deviates from a beacon optical axis, the PSD firstly calculates a single-path beacon light through a multi-target position detection method combining communication and tracking, and then calculates the position of a beacon light spot through a PSD position calculation formula according to the received power of the single-path beacon light;
step 8: the swinging angle of the parabolic reflector is controlled through beacon modulation and a servo measurement and control board according to the PSD resolving position, so that a plurality of beacon lights can be tracked to a zero point or a certain position at the same time, and communication lights can be aligned and coupled to the space optical coupler 12;
step 9: the space optical coupler 12 is used for coupling the space light into the optical fiber, and isolation of communication light receiving and transmitting is realized through the optical fiber circulator 13;
step 10: communication light emitted by the wavelength division multiplexing communication transmitter 14 enters the public end through the optical fiber at the emitting end of the optical fiber circulator 13, so that the emission of the communication light is realized, meanwhile, a received communication light beam enters 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, demodulation of communication optical data and modulation of 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 multi-spot code division multiple access simultaneous miss distance detection of the single PSD detector is completed, and a solution method 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 in a space laser communication networking based on code division multiple access provided by the invention are described in detail, and specific examples are applied to the description of the principle and the implementation mode of the invention, and the description of the above examples 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 protection scope claimed in the present application, and the practical protection scope also includes reasonable combinations of technical features described in the above embodiments, and reasonable substitutions that can be considered by those skilled in the art. Meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (5)
1. A device for simultaneously tracking multiple light spots of a spatial laser communication network based on code multiple address division, the device comprising:
three slave optical terminals and one master optical terminal (1); the three slave optical end machines surround the main optical end machine (1) and are mutually placed at an included angle of 120 degrees; the three slave optical terminators comprise a slave optical terminator A (2), a slave optical terminator B (3) and a slave optical terminator C (4);
the main optical transceiver (1) comprises: the device 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 space optical coupler (12), an optical 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 optical antenna of the parabolic reflector receives three groups of light beams sent by the optical transceiver, each group of light beams comprises a beam of beacon light and a beam of communication light, the parabolic reflector converts all the received light beams into parallel light and then emits the parallel light to the 800/1550nm broadband filter (6), the 800/1550nm broadband filter (6) reflects three beams of communication light in the received parallel light to the space optical coupler (12), and the three beams of beacon light in the parallel light are transmitted and then emitted to the target surface of the PSD position sensor (8) after being transmitted by the light splitting sheet (7);
the beacon laser (10) is used for emitting emitted 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 emitted beacon light is emitted to the light splitting sheet (7), refracted by the light splitting sheet (7), transmitted by the 800/1550nm broadband 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, and the resolving result is the actual positions of light spots of three beacon lights; and the three beacon lights are precisely incident on the space optical coupler (12) by controlling the swinging angle of the parabolic reflector according to the resolving result.
2. The device for simultaneously tracking multiple light spots in a spatial laser communication network based on code division multiple access according to claim 1, wherein the beacon light modulation and servo measurement and control board (11) is used for resolving the received signals to obtain a 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 corresponding to the code pattern are generated by the local codeNCO (21) under the drive of the frequency word, respectively: PRN (PRN) 1 、PRN 2 And PRN 3 Is a module of (a);
the three PRN codes are respectively divided into three different phases: advanced PRN 1 Code, current PRN 1 Code, hysteresis PRN 1 Code, advanced PRN 2 Code, current PRN 2 Code, hysteresis PRN 2 Code, advanced PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 A module of codes;
the beacon signal x1 is combined with the leading PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 A module for performing cross correlation operation on the codes;
the beacon signal x1 is combined with the leading PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 A module for performing cross correlation operation on the codes;
the beacon signal x1 is combined with the leading PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 A module for performing cross correlation operation on the codes;
the beacon signal x2 is combined with the leading PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 A module for performing cross correlation operation on the codes;
the beacon signal x2 is combined with the leading PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 A module for performing cross correlation operation on the codes;
the beacon signal x2 is combined with the leading PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 A module for performing cross correlation operation on the codes;
the beacon signal y1 is combined with the leading PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 A module for performing cross correlation operation on the codes;
the beacon signal y1 is combined with the leading PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 A module for performing cross correlation operation on the codes;
the beacon signal y1 is combined with the leading PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 A module for performing cross correlation operation on the codes;
the beacon signal y2 is combined with the leading PRN 1 Code, current PRN 1 Code and hysteresis PRN 1 A module for performing cross correlation operation on the codes;
the beacon signal y2 is combined with the leading PRN 2 Code, current PRN 2 Code and hysteresis PRN 2 A module for performing cross correlation operation on the codes;
the beacon signal y2 is combined with the leading PRN 3 Code, current PRN 3 Code and hysteresis PRN 3 A module for performing cross correlation operation on the codes;
processing the results of the 12 cross-correlation operations through phase discrimination operation, and respectively adjusting corresponding PRNs according to the processing results 1 、PRN 2 And PRN 3 Code for making the correlation peak value of current code1, and collecting values of rho corresponding to three current PRN codes respectively; the rho is x1, x2, y1 and y2 corresponding to three current codes;
the module is used for respectively calculating the positions of three light spots on the target surface of the PSD position sensor (8) according to the values of rho 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 specifically as follows: according to the following formula:
wherein delta is nx Representing the actual position of the centre of gravity of the light spot in the x-axis direction, delta ny Representing the actual position of the center of gravity of the light spot in the y-axis direction, P nx1 、P nx2 、P ny1 And P ny2 And L is the half size of the target surface of the PSD position sensor (8), wherein rho is the value of x1, x2, y1 and y2 corresponding to the current code respectively.
3. The device for simultaneously tracking multiple light spots of a spatial laser communication network based on code division multiple access according to claim 1, wherein the light splitting sheet (7) is a wavelength light splitting sheet.
4. The device for simultaneously tracking multiple light spots of a spatial 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 device for simultaneously tracking multiple light spots of a spatial laser communication network based on code division multiple access according to claim 1, wherein the beacon light modulation and the servo control board have a code division multiple access electric signal output function, a PSD beacon light position and beacon light communication data resolving function and a single pendulum rotation angle control function.
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