Inter-satellite communication time synchronization integrated system based on laser microwave composite antenna

Abstract

An inter-satellite communication time synchronization integrated system based on a laser microwave composite antenna comprises an electronics unit which is in communication connection with a satellite platform; the laser microwave composite antenna unit is in communication connection with the electronics unit; wherein the electronics unit, the laser microwave composite antenna unit and the satellite platform cooperate with each other to realize establishment of an inter-satellite laser communication link or an inter-satellite microwave communication link and synchronization of high-speed communication measurement time. Technical characteristics of a microwave communication system and a laser communication system are comprehensively considered, meanwhile, a laser-microwave composite link receiving and transmitting system is utilized, the problems that the communication rate of an inter-satellite microwave link is low and the time synchronization precision is difficult to improve are solved, high-precision time synchronization and inter-satellite relative position information can be provided, the communication efficiency can be improved, and the time synchronization precision is improved. And the autonomous navigation capability and the communication service providing capability of the satellite system are enhanced.

Description

Technical Field

[0001] The present invention relates to the field of space laser communication and inter-satellite time and frequency transfer technology, and in particular to an inter-satellite communication time synchronization integrated system based on a laser microwave composite antenna. Background Art

[0002] Low-orbit satellite Internet needs to provide stable and high-speed communication services worldwide, which directly depends on the satellite's precise positioning and time synchronization capabilities. At present, the space-time reference maintenance of low-orbit satellites is the same as that of ground systems, mainly relying on the Global Navigation Satellite System (GNSS). However, GNSS is extremely fragile. Under strong confrontation conditions, there is a risk of failure or denial of GNSS and ground stations. Therefore, large-scale low-orbit Internet satellites must have high-precision space-time reference self-maintenance capabilities to ensure long-term reliable and stable operation.

[0003] At present, low-orbit satellites mainly use intersatellite microwave links for intersatellite communication and time difference measurement, so as to achieve autonomous operation without relying on external systems, and improve the positioning and autonomous navigation capabilities of satellite systems. However, the accuracy of time difference measurement and time synchronization based on satellite microwave links has been improving slowly; in recent years, studies have found that optical means can be used to improve the intersatellite communication rate and time synchronization accuracy, thereby constructing intersatellite laser links. The laser network composed of intersatellite laser links has low communication delay and massive data transmission capabilities. However, considering the influence of complex sunlight in space, the laser link detector is severely interfered with and the link is interrupted in the case of solar eclipse, etc., based on the idea of ​​intersatellite laser microwave integration, on the one hand, it can supplement the continuity of intersatellite measurement data when the laser link is broken, and on the other hand, it can improve the timeliness of laser link establishment.

[0004] At present, low-orbit satellites are mainly equipped with independent laser and microwave communication systems, which are heavy and power-consuming. Therefore, how to realize the lightweight and miniaturization of the high-precision aiming, capture and tracking system of the inter-satellite hybrid link, realize the integrated transmission of inter-satellite laser microwave signals, reduce the system size, weight and power consumption, and provide the constellation communication network with high-speed, anti-interference, fast link establishment and high stability capabilities, and complete the integration of laser microwave link communication ranging and high-precision time synchronization between satellite platforms is an urgent problem to be solved.

[0005] It should be understood that the above statements merely provide background technology related to the present invention and do not necessarily constitute prior art. Summary of the invention

[0006] The purpose of the present invention is to provide an integrated inter-satellite communication time synchronization system based on a laser microwave composite antenna, to realize the integrated transmission of inter-satellite laser microwave signals, to reduce the system volume, weight and power consumption, and to provide the constellation communication network with high-speed, anti-interference, fast link establishment and high stability capabilities, and to complete the integration of laser microwave link communication ranging and high-precision time synchronization between satellite platforms.

[0007] In order to achieve the above-mentioned purpose, the present invention provides an integrated system for inter-satellite communication time synchronization based on a laser microwave composite antenna, comprising: an electronics unit, which is communicatively connected with the satellite platform; a laser microwave composite antenna unit, which is communicatively connected with the electronics unit; wherein the electronics unit, the laser microwave composite antenna unit and the satellite platform cooperate with each other to realize the establishment of an inter-satellite laser communication link or an inter-satellite microwave communication link, as well as high-speed communication measurement time synchronization.

[0008] Among them, the electronics unit includes: an integrated laser microwave time synchronization communication module, which is respectively connected to the laser microwave composite antenna unit and the satellite platform for communication, receives user data from the satellite platform, and selects laser or microwave communication mode according to the data, and converts the user data into laser signals or microwave signals accordingly, and transmits them to the laser microwave composite antenna unit; and receives laser signals or microwave signals fed back from the laser microwave composite antenna unit, and converts the fed back laser signals or microwave signals into electrical signals and transmits them to the satellite platform.

[0009] Preferably, the electronics unit also includes: an integrated optical amplifier, which is respectively connected to the laser microwave composite antenna unit and the integrated laser microwave time synchronization communication module, receives the laser signal transmitted by the integrated laser microwave time synchronization communication module, amplifies the laser signal, and transmits it to the laser microwave composite antenna unit; and receives the laser signal transmitted by the laser microwave composite antenna unit, amplifies the laser signal, and transmits it to the integrated laser microwave time synchronization communication module; a time-frequency module, which is respectively connected to the atomic clock in the satellite platform and the integrated laser microwave time synchronization communication module, receives the time-frequency reference signal of the atomic clock and outputs a second pulse signal to the integrated laser microwave time synchronization communication module; a main control module, which is respectively connected to the satellite platform, the integrated laser microwave time synchronization communication module and the time-frequency module, outputs electrical signals to control the satellite platform to input and output user data, control the integrated laser microwave time synchronization communication module to open and close, and control the time-frequency module to output a reference signal.

[0010] Preferably, the laser microwave composite antenna unit includes a laser microwave composite antenna: wherein the laser microwave composite antenna is communicatively connected to the integrated optical amplifier, receives laser signals transmitted from the integrated optical amplifier, receives laser signals from the outside, and transmits them to the integrated optical amplifier; and the laser microwave composite antenna is also communicatively connected to the integrated laser microwave time synchronization communication module, receives microwave signals transmitted from the integrated laser microwave time synchronization communication module, receives microwave signals from the outside, and transmits them to the integrated laser microwave time synchronization communication module.

[0011] Preferably, the electronics unit also includes a secondary power supply module; the secondary power supply module is connected to the satellite platform via a primary bus to achieve power conversion of the primary bus, and outputs secondary electrical signals to other modules of the integrated system to provide power for other modules of the integrated system.

[0012] Preferably, the laser microwave compound antenna unit also includes a tracking and aiming mechanism, which is connected to the laser microwave compound antenna and controls the tracking and aiming mechanism to adjust the position and orientation of the laser microwave compound antenna; and the electronics unit also includes a fine tracking drive circuit and a coarse tracking drive circuit; the fine tracking drive circuit and the coarse tracking drive circuit are respectively communicated with the tracking and aiming mechanism, and the fine tracking drive circuit and the coarse tracking drive circuit control the rotation of the tracking and aiming mechanism to adjust the position and orientation of the laser microwave compound antenna.

[0013] Preferably, the integrated laser microwave time synchronization communication module includes: an embedded data integrated processing chip; a laser processing module, which is respectively communicated with the embedded data integrated processing chip and the integrated optical amplifier to process the laser signal; and a microwave processing module, which is respectively communicated with the embedded data integrated processing chip and the laser microwave composite antenna to process the microwave signal.

[0014] Preferably, the laser processing module includes a laser modulation transmitting module and a laser demodulation receiving module.

[0015] Among them, in the transmitting state, the embedded data integrated processing chip receives user data and converts it into an electrical signal, the laser modulation transmitting module receives the electrical signal transmitted by the embedded data integrated processing chip, and converts it into a laser signal, completes the modulation of the laser signal, and sends the laser signal to the integrated optical amplifier for power amplification, and finally transmits it to the laser microwave composite antenna, and the laser microwave composite antenna completes the transmission of the laser signal.

[0016] Among them, in the receiving state, the laser microwave composite antenna receives the laser signal emitted by the remote end, and after the integrated optical amplifier completes the low-noise amplification of the laser signal, it enters the laser demodulation receiving module, and the laser demodulation receiving module converts the laser signal into an electrical signal and outputs it to the embedded data comprehensive processing chip, and then the embedded data comprehensive processing chip processes the electrical signal to complete the user data output.

[0017] Preferably, the microwave processing module includes a microwave modulation transmitting module and a microwave demodulation receiving module, and the microwave modulation transmitting module and the microwave demodulation receiving module are connected by an electric circulator, and are connected to the laser microwave composite antenna through the electric circulator.

[0018] Among them, in the transmitting state, the embedded data integrated processing chip receives user data and converts it into an electrical signal, the microwave modulation transmission module receives the electrical signal transmitted by the embedded data integrated processing chip, and converts it into a microwave signal, completes the modulation of the microwave signal, and then transmits the microwave signal to the laser microwave composite antenna via the electric circulator, and the laser microwave composite antenna completes the transmission of the microwave signal.

[0019] Among them, in the receiving state, the laser microwave composite antenna receives the microwave signal emitted by the remote end, transmits it to the microwave demodulation receiving module through the electric circulator, and the microwave demodulation receiving module converts the microwave signal into an electrical signal and outputs it to the embedded data integrated processing chip, and then the embedded data integrated processing chip processes the electrical signal to complete the user data output.

[0020] Preferably, the laser microwave composite antenna comprises: a microwave feed source, a laser rear optical path, a laser and microwave multiplexer / demultiplexer, a laser phase controller, a primary mirror and a secondary mirror; wherein the primary mirror is a parabolic convex lens; the secondary mirror is located on the concave side of the parabola of the primary mirror and is in the same plane as the center position of the primary mirror; the laser and microwave multiplexer / demultiplexer is arranged at a certain angle on the convex side of the parabola of the primary mirror; the laser phase controller is arranged at a certain angle on the side of the laser and microwave multiplexer / demultiplexer away from the primary mirror.

[0021] Preferably, the microwave feed source receives the microwave signal and transmits it to the laser and microwave multiplexer / demultiplexer, and then the laser and microwave multiplexer / demultiplexer combine microwaves of different wavelengths and transmit them to the middle part of the primary mirror in the form of parallel microwave beams, and then pass through the primary mirror to the secondary mirror, and then be reflected by the secondary mirror to the edge part of the primary mirror and then be emitted in parallel by the primary mirror, so as to realize the transmission of microwave signals; the laser signal is received by the laser rear optical path and transmitted to the laser phase controller to ensure that the phases of multiple laser beams remain consistent, and then the laser signals of different wavelengths are combined by the laser and microwave multiplexer / demultiplexer, and transmitted to the middle part of the primary mirror in the form of parallel laser beams, and then pass through the primary mirror to the secondary mirror, and then be reflected by the secondary mirror to the edge part of the primary mirror and then be emitted in parallel by the primary mirror, so as to realize the transmission of laser signals.

[0022] In summary, compared with the prior art, the intersatellite communication time synchronization integrated system based on laser microwave composite antenna provided by the present invention has at least the following beneficial effects:

[0023] (1) Taking into account the technical characteristics of microwave and laser communication systems, an integrated design of microwave and laser communication systems is carried out, using microwave links for large field of view, low-speed intersatellite communication, and using laser links for small field of view, high-precision, high-speed intersatellite communication;

[0024] (2) The laser microwave composite link transceiver system was used to solve the problems of low intersatellite microwave link communication rate and difficulty in improving time synchronization accuracy. At the same time, the continuity of intersatellite measurement data when the intersatellite laser link is broken was supplemented to improve the timeliness of laser link establishment.

[0025] (3) It can not only provide high-precision time synchronization and inter-satellite relative position information, but also improve communication efficiency and enhance the satellite system's autonomous navigation capabilities and ability to provide communication services. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the specific data transmission process of the integrated laser microwave time synchronization communication module of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the laser microwave composite antenna unit of the present invention. DETAILED DESCRIPTION

[0029] The following is combined with Figures 1 to 3 , the present invention is further explained by describing a preferred specific embodiment in detail.

[0030] It should be noted that the drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the embodiments of the present invention, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention.

[0031] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only the elements explicitly listed, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] like Figure 1 As shown, the present invention provides an integrated system for inter-satellite communication time synchronization based on a laser microwave composite antenna, comprising: an electronics unit 1, which is communicatively connected with the satellite platform 3; a laser microwave composite antenna unit 2, which is communicatively connected with the electronics unit 1; wherein the electronics unit 1, the laser microwave composite antenna unit 2 and the satellite platform 3 cooperate to realize the establishment of an inter-satellite laser communication link or an inter-satellite microwave communication link, as well as a high-speed communication measurement time synchronization function.

[0033] Furthermore, the electronics unit 1 includes: an integrated laser microwave time synchronization communication module 11, which is respectively connected to the laser microwave composite antenna unit 2 and the satellite platform 3 for communication, receives user data from the satellite platform 3, and selects laser or microwave communication mode according to the data, and converts the user data into laser signals or microwave signals accordingly, and transmits them to the laser microwave composite antenna unit 2; and receives laser signals or microwave signals fed back from the laser microwave composite antenna unit 2, and converts the fed back laser signals or microwave signals into electrical signals and transmits them to the satellite platform 3; an integrated optical amplifier 12, which is respectively connected to the laser microwave composite antenna unit 2 and the integrated laser microwave time synchronization communication module 11 for communication, receives the laser signals transmitted by the integrated laser microwave time synchronization communication module 11, amplifies the power of the laser signals, and transmits them to the satellite platform 3. The laser signal is transmitted to the laser microwave composite antenna unit 2; and the laser signal transmitted by the laser microwave composite antenna unit 2 is received and the laser signal is power-amplified, and then transmitted to the integrated laser microwave time synchronization communication module 11; the time-frequency module 17 is respectively connected to the atomic clock 171 in the satellite platform 3 and the integrated laser microwave time synchronization communication module 11, receives the time-frequency reference signal of the atomic clock 171 and outputs a second pulse signal to the integrated laser microwave time synchronization communication module 11; the main control module 16 is respectively connected to the satellite platform 3, the integrated laser microwave time synchronization communication module 11 and the time-frequency module 17, outputs an electrical signal to control the satellite platform 3 to input and output user data, controls the integrated laser microwave time synchronization communication module 11 to open and close, and controls the time-frequency module 17 to output a reference signal.

[0034] Furthermore, the laser microwave compound antenna unit 2 includes a laser microwave compound antenna 21, which is communicatively connected to the integrated optical amplifier 12, receives laser signals transmitted from the integrated optical amplifier 12, and receives laser signals from the outside and transmits them to the integrated optical amplifier 12; and the laser microwave compound antenna 21 is also communicatively connected to the integrated laser microwave time synchronization communication module 11, receives microwave signals transmitted from the integrated laser microwave time synchronization communication module 11, and receives microwave signals from the outside and transmits them to the integrated laser microwave time synchronization communication module 11.

[0035] Furthermore, the electronic unit 1 also includes: a secondary power supply module 15, and the secondary power supply module 15 is connected to the satellite platform 3 through a primary bus to realize power conversion of the primary bus and output secondary electrical signals to other modules of the integrated system to provide power.

[0036] Furthermore, the laser microwave compound antenna unit 2 also includes a tracking and aiming mechanism 22, and the tracking and aiming mechanism 22 is connected to the laser microwave compound antenna 21. By controlling the tracking and aiming mechanism 22, the position and orientation of the laser microwave compound antenna 21 can be adjusted.

[0037] Furthermore, the electronics unit 1 also includes a fine tracking drive circuit 13 and a coarse tracking drive circuit 14; wherein the tracking and aiming mechanism 22 is respectively communicated with the fine tracking drive circuit 13 and the coarse tracking drive circuit 14, and when it is necessary to adjust the position and direction of the laser microwave compound antenna 21, the coarse tracking drive circuit 14 controls the tracking and aiming mechanism 22 to realize a large range of rotation of the laser microwave compound antenna 21, and the fine tracking drive circuit 13 controls the tracking and aiming mechanism 22 to realize high-precision adjustment, thereby completing the precise pointing control of the laser or microwave in the laser microwave compound antenna 21.

[0038] Further, such as Figure 2 As shown, the integrated laser microwave time synchronization communication module 11 includes: an embedded data integrated processing chip 111; a laser processing module, which is respectively connected to the embedded data integrated processing chip 111 and the integrated optical amplifier 12 to process the laser signal; and a microwave processing module, which is respectively connected to the embedded data integrated processing chip 111 and the laser microwave composite antenna 21 to process the microwave signal.

[0039] It can be understood that the embedded data integrated processing chip 111 is connected to the satellite platform 3 for communication, can receive user data from the satellite platform 3, and selects laser or microwave communication mode according to the data rate or data volume of the input user data, the lighting environment, etc., wherein the laser communication mode is selected for high-speed communication data, and the microwave communication mode is selected for low-speed communication data. The embedded data integrated processing chip 111 processes the received user data according to the selected communication mode and transmits it to the laser processing module or the microwave processing module accordingly.

[0040] Furthermore, the laser processing module includes a laser modulation and transmission module 112 and a laser demodulation and reception module 113 .

[0041] Furthermore, the laser modulation transmission module 112 includes: a driving amplifier 1121, connected to the embedded data integrated processing chip 111; an electro-optical modulator 1122, connected to the driving amplifier 1121; wherein the driving amplifier 1121 amplifies the user data encoded by the embedded data integrated processing chip 111, and then combines with the signal light source 1123, and modulates the electrical signal of the input data onto the optical carrier signal through the electro-optical modulator 1122, thereby completing the modulation of the laser signal and sending it to the integrated optical amplifier 12, and transmitting the laser signal to the laser microwave composite antenna 21 via the integrated optical amplifier 12.

[0042] Furthermore, the laser demodulation receiving module 113 includes: a photodetector 1131, connected to the integrated optical amplifier 12; a limiting amplifier 1132, connected to the photodetector 1131; wherein the photodetector 1131 converts the laser signal from the integrated optical amplifier 12 into an electrical signal, and amplifies and processes the electrical signal through the limiting amplifier 1132 and transmits it to the embedded data integrated processing chip 111 to complete the demodulation of the laser signal.

[0043] Furthermore, the microwave processing module includes a microwave modulation transmitting module 115 and a microwave demodulation receiving module 114, and the two are connected via an electric circulator 116, and both are connected to the laser microwave composite antenna 21 via the electric circulator.

[0044] Furthermore, the microwave modulation transmission module 115 includes a digital-to-analog converter 1151, an intermediate frequency amplifier 1152, a first bandpass filter 1153, a first mixer 1154, a second bandpass filter 1155, a first low noise amplifier 1156 and a power amplifier 1157 connected in sequence; wherein the digital-to-analog converter 1151 is connected to the embedded data integrated processing chip 111, and the embedded data integrated processing chip 111 mixes the user data electrical signal after coding modulation and interpolation filtering into an intermediate frequency signal through digital mixing, and then transmits it to the digital-to-analog converter 1151 to obtain The analog signal is then amplified by the intermediate frequency amplifier 1152 and narrow-band filtered by the first band-pass filter 1153, and then mixed with the local oscillation signal of the transmitting end by the first mixer 1154 and then up-converted to obtain a radio frequency signal, and then narrow-band filtered by the second band-pass filter 1155 and pre-amplified by the first low-noise amplifier 1156, and power amplified by the power amplifier 1157, and the formed microwave signal is transmitted to the electric circulator 116, and the microwave signal is output to the laser microwave compound antenna 21 via the electric circulator 116.

[0045] Furthermore, the microwave demodulation receiving module 114 includes a limiting filter 1141, a second low-noise amplifier 1142, a third bandpass filter 1143, a third low-noise amplifier 1144, a second mixer 1145, a fourth bandpass filter 1146, a fourth low-noise amplifier 1147 and an analog-to-digital converter 1148 connected in sequence; wherein the limiting filter 1141 is connected to the electric circulator 116, and after the microwave signal from the laser microwave compound antenna 21 enters the electric circulator 116, it is firstly limited by the limiting filter 1141, and then amplified by the second low-noise amplifier 1142. , then narrow-band filtered by the third band-pass filter 1143 and amplified by the third low-noise amplifier 1144, then mixed with the local oscillation signal of the receiving end by the second mixer 1145 and converted into an intermediate frequency signal after down-conversion, and narrow-band filtered by the fourth band-pass filter 1146 and amplified by the fourth low-noise amplifier 1147, and finally the analog signal obtained is transmitted to the analog-to-digital converter 1148, the obtained electrical signal is converted from an analog signal to a digital signal, and transmitted to the embedded data integrated processing chip 111 for digital down-conversion, demodulation and other processing, so as to finally realize the function of microwave signal reception.

[0046] Further, such as Figure 3 As shown, the specific structure of the laser microwave composite antenna 21 includes: a microwave feed source 211, a laser rear optical path 212, a laser and microwave multiplexer / demultiplexer 213, a laser phase controller 214, a primary mirror 215 and a secondary mirror 216; the primary mirror 215 is a parabolic convex lens; the secondary mirror 216 is located on the concave side of the parabola of the primary mirror, and is in the same plane as the center position of the primary mirror 215; the laser and microwave multiplexer / demultiplexer 213 is arranged at a certain angle on the convex side of the parabola of the primary mirror; the laser phase controller 214 is arranged at a certain angle on the side of the laser and microwave multiplexer / demultiplexer 213 away from the primary mirror 215.

[0047] The microwave feed source 211 receives the microwave signal and transmits it to the laser and microwave multiplexer / demultiplexer 213, and then the laser and microwave multiplexer / demultiplexer 213 combines microwaves of different wavelengths and transmits them to the middle part of the primary mirror 215 in the form of a parallel microwave beam, and then passes through the primary mirror 215 to the secondary mirror 216, and is reflected by the secondary mirror 216 to the edge of the primary mirror 215 and then emitted in parallel by the primary mirror 215, thereby realizing the transmission of the microwave signal.

[0048] The laser signal is received by the laser rear optical path 212 and transmitted to the laser phase controller 214, so as to realize precise control of the laser phase and ensure that the phases of multiple laser beams remain consistent. Then, the laser signals of different wavelengths are combined by the laser and microwave multiplexer / demultiplexer 213 to realize the transmission of multiple signals in the same optical fiber, and are transmitted to the middle part of the primary mirror 215 in the form of parallel laser beams, and pass through the primary mirror 215 to the secondary mirror 216, and are reflected by the secondary mirror 216 to the edge part of the primary mirror 215 and then emitted in parallel by the primary mirror 215, so as to realize the transmission of laser signals.

[0049] In a preferred embodiment of the present invention, a specific application example of the inter-satellite communication time synchronization integrated system based on the laser microwave composite antenna is as follows:

[0050] The main control module 16 controls the input of user data, turns on the integrated laser microwave time synchronization communication module 11, and turns on the time-frequency module 17, thereby the inter-satellite communication time synchronization integrated system based on the laser microwave composite antenna starts to operate.

[0051] The intersatellite communication time synchronization integrated system is in laser communication mode. In the transmitting state, the embedded data integrated processing chip 111 simultaneously receives the user data of the satellite platform 3 and the second pulse signal from the time-frequency module 17, frames and encodes the user data, inserts the ranging information into the normal data transmission frame, and transmits the encoded data to the laser modulation transmitting module 112 to complete the modulation of the laser signal and sends it to the integrated optical amplifier 12 for power amplification, and finally inputs it into the laser microwave composite antenna 21, and the laser microwave composite antenna 21 completes the laser signal transmission; in the receiving state, the laser microwave composite antenna receives the laser signal emitted by the remote end, and after the integrated optical amplifier 12 completes the low-noise amplification of the optical signal, it is transmitted to the laser demodulation receiving module 113 to complete the demodulation of the laser signal and the demodulated laser signal is deframed and decoded by the embedded data integrated processing chip 111, and a two-way one-way ranging method is adopted, and the second pulse is used to measure the local clock, and the ranging process parameters are corrected, and the user data output is completed while the corrected synchronous second pulse is output.

[0052] The intersatellite communication time synchronization integrated system is in microwave communication mode. In the transmitting state, the embedded data integrated processing chip 111 simultaneously receives local user data and second pulse signals from the time-frequency module, frames and encodes the user data, inserts ranging information into normal data transmission frames, and transmits the encoded data to the microwave modulation transmitting module 115 to complete the modulation of the microwave signal and sends it to the electric circulator 116, and finally inputs it into the laser microwave composite antenna 21, and the laser microwave composite antenna 21 completes the microwave signal transmission; in the receiving state, the laser microwave composite antenna receives the microwave signal transmitted by the remote end, transmits it to the microwave demodulation receiving module 114 through the electric circulator 116 to complete the demodulation of the microwave signal, and performs digital down-conversion, demodulation and other processing through the embedded data integrated processing chip 111, and then deframes and decodes the demodulated signal according to the communication protocol, adopts a two-way one-way ranging method, uses second pulses to measure the local clock, corrects the ranging process parameters, completes the output of user data, and outputs the corrected synchronous second pulse.

[0053] In summary, the present invention is an integrated intersatellite communication time synchronization system based on laser microwave composite antenna, which comprehensively considers the technical characteristics of microwave and laser communication systems, integrates the microwave and laser communication systems, uses microwave links for large field of view, low-speed intersatellite communication; uses laser links for small field of view, high-precision, high-speed communication. Among them, the laser microwave composite antenna adopts a card-type lightweight integrated design, which is driven by a two-dimensional turntable to rotate in a large range of angles; the control, power supply, signal processing and other parts of the microwave and laser communication systems are also integrated at the same time, and both are powered by a unified secondary power supply; the modulation and demodulation of the laser and microwave communication systems are completed in the integrated laser microwave time synchronization communication module, and the measured clock difference and time code are compiled into the frame header of the communication data for intersatellite interaction, thereby realizing the transmission and reception of communication data and the measurement of the distance between two satellites, which has the advantages of miniaturization, high integration, high system performance, low power consumption, and resistance to space environment, and its advantages are particularly prominent in satellite payload systems.

[0054] The present invention discloses an integrated system for time synchronization of intersatellite communication based on a laser microwave composite antenna, and utilizes a laser microwave composite link transceiver system at the same time, thereby solving the problems of low intersatellite microwave link communication rate and difficulty in improving time synchronization accuracy, and at the same time supplements the continuity of intersatellite measurement data when the intersatellite laser link is broken to improve the timeliness of laser link establishment, thereby not only providing high-precision time synchronization and intersatellite relative position information, but also improving communication efficiency, and enhancing the satellite system's autonomous navigation capability and the ability to provide communication services.

[0055] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. An integrated system for intersatellite communication time synchronization based on laser microwave composite antenna, characterized in that: include: an electronics unit, communicatively connected to the satellite platform; A laser microwave composite antenna unit is communicatively connected with the electronics unit; Wherein, the electronics unit, the laser microwave composite antenna unit and the satellite platform cooperate with each other to achieve the establishment of an inter-satellite laser communication link or an inter-satellite microwave communication link, and high-speed communication measurement time synchronization; Among them, the electronics unit includes: an integrated laser microwave time synchronization communication module, which is respectively connected to the laser microwave composite antenna unit and the satellite platform for communication, receives user data from the satellite platform, and selects laser or microwave communication mode according to the data, and converts the user data into laser signals or microwave signals accordingly, and transmits them to the laser microwave composite antenna unit; and receives laser signals or microwave signals fed back from the laser microwave composite antenna unit, and converts the fed back laser signals or microwave signals into electrical signals and transmits them to the satellite platform.

2. The intersatellite communication time synchronization integrated system based on laser microwave composite antenna according to claim 1, characterized in that: The electronics unit also includes: an integrated optical amplifier, respectively connected to the laser microwave composite antenna unit and the integrated laser microwave time synchronization communication module for communication, receiving the laser signal transmitted by the integrated laser microwave time synchronization communication module, amplifying the power of the laser signal, and transmitting it to the laser microwave composite antenna unit; and receiving the laser signal transmitted by the laser microwave composite antenna unit, amplifying the power of the laser signal, and transmitting it to the integrated laser microwave time synchronization communication module; The time-frequency module is respectively connected to the atomic clock in the satellite platform and the integrated laser microwave time synchronization communication module, receives the time-frequency reference signal of the atomic clock and outputs a second pulse signal to the integrated laser microwave time synchronization communication module; The main control module is respectively connected to the satellite platform, the integrated laser microwave time synchronization communication module and the time-frequency module for communication, and outputs electrical signals to control the satellite platform to input and output user data, to control the integrated laser microwave time synchronization communication module to open and close, and to control the time-frequency module to output reference signals.

3. The intersatellite communication time synchronization integrated system based on laser microwave composite antenna according to claim 1, characterized in that: The laser microwave composite antenna unit comprises a laser microwave composite antenna: The laser microwave composite antenna is communicatively connected with the integrated optical amplifier to receive the laser signal transmitted from the integrated optical amplifier, and receives the laser signal from the outside and transmits it to the integrated optical amplifier; The laser microwave composite antenna is also communicatively connected to the integrated laser microwave time synchronization communication module, receives microwave signals transmitted by the integrated laser microwave time synchronization communication module, and receives microwave signals from the outside and transmits them to the integrated laser microwave time synchronization communication module.

4. The intersatellite communication time synchronization integrated system based on laser microwave composite antenna according to claim 2, characterized in that: The electronics unit also includes a secondary power supply module; The secondary power supply module is connected to the satellite platform via a primary bus to achieve power conversion of the primary bus, and outputs secondary electrical signals to other modules of the integrated system to provide power for the other modules of the integrated system.

5. The intersatellite communication time synchronization integrated system based on laser microwave composite antenna according to claim 3 is characterized in that: The laser microwave compound antenna unit further comprises a tracking and aiming mechanism, which is connected to the laser microwave compound antenna and is controlled to adjust the position and orientation of the laser microwave compound antenna; And the electronics unit also includes a fine tracking drive circuit and a coarse tracking drive circuit; The fine tracking drive circuit and the coarse tracking drive circuit are respectively connected to the tracking and aiming mechanism for communication, and the fine tracking drive circuit and the coarse tracking drive circuit control the tracking and aiming mechanism to rotate so as to adjust the position and orientation of the laser microwave composite antenna.

6. The intersatellite communication time synchronization integrated system based on laser microwave composite antenna according to claim 3, characterized in that: The integrated laser microwave time synchronization communication module comprises: Embedded data integrated processing chip; A laser processing module is respectively connected to the embedded data integrated processing chip and the integrated optical amplifier for processing the laser signal; The microwave processing module is respectively connected to the embedded data integrated processing chip and the laser microwave composite antenna for communication to process the microwave signal.

7. The intersatellite communication time synchronization integrated system based on laser microwave composite antenna according to claim 6, characterized in that: The laser processing module includes a laser modulation and transmission module and a laser demodulation and reception module; In the transmitting state, the embedded data integrated processing chip receives user data and converts it into an electrical signal, the laser modulation transmitting module receives the electrical signal transmitted by the embedded data integrated processing chip, converts it into a laser signal, completes the modulation of the laser signal, and sends the laser signal to the integrated optical amplifier for power amplification, and finally transmits it to the laser microwave composite antenna, and the laser microwave composite antenna completes the transmission of the laser signal; In the receiving state, the laser microwave composite antenna receives the laser signal emitted by the remote end, and after the integrated optical amplifier completes the low-noise amplification of the laser signal, it enters the laser demodulation receiving module, and the laser demodulation receiving module converts the laser signal into an electrical signal and outputs it to the embedded data comprehensive processing chip, and then the embedded data comprehensive processing chip processes the electrical signal and completes the user data output.

8. The intersatellite communication time synchronization integrated system based on laser microwave composite antenna according to claim 6, characterized in that: The microwave processing module includes a microwave modulation transmitting module and a microwave demodulation receiving module, and the microwave modulation transmitting module and the microwave demodulation receiving module are connected by an electric circulator, and are connected to the laser microwave composite antenna through the electric circulator; In the transmitting state, the embedded data integrated processing chip receives user data and converts it into an electrical signal, the microwave modulation transmitting module receives the electrical signal transmitted by the embedded data integrated processing chip, converts it into a microwave signal, completes the modulation of the microwave signal, and then transmits the microwave signal to the laser microwave composite antenna via the electrical circulator, and the laser microwave composite antenna completes the transmission of the microwave signal; In the receiving state, the laser microwave composite antenna receives the microwave signal emitted by the remote end, transmits it to the microwave demodulation receiving module through the electric circulator, and the microwave demodulation receiving module converts the microwave signal into an electrical signal and outputs it to the embedded data integrated processing chip, which then processes the electrical signal and completes the user data output.

9. The intersatellite communication time synchronization integrated system based on laser microwave composite antenna according to claim 3, characterized in that: The laser microwave composite antenna comprises: a microwave feed source, a laser rear optical path, a laser and microwave multiplexer / demultiplexer, a laser phase controller, a primary mirror and a secondary mirror; Among them, the primary mirror is a parabolic convex lens; the secondary mirror is located on the concave side of the parabola of the primary mirror and is in the same plane as the center position of the primary mirror; the laser and microwave multiplexer / demultiplexer are arranged at a certain angle on the convex side of the parabola of the primary mirror; the laser phase controller is arranged at a certain angle on the side of the laser and microwave multiplexer / demultiplexer away from the primary mirror.

10. The intersatellite communication time synchronization integrated system based on laser microwave composite antenna according to claim 9, characterized in that: The microwave feed source receives the microwave signal and transmits it to the laser and microwave multiplexer / demultiplexer, and then the laser and microwave multiplexer / demultiplexer combine microwaves of different wavelengths and transmit them to the middle part of the primary mirror in the form of parallel microwave beams, and then pass through the primary mirror to the secondary mirror, and then be reflected by the secondary mirror to the edge of the primary mirror and then emitted in parallel by the primary mirror, so as to realize the transmission of microwave signals; The laser signal is received by the laser rear optical path and transmitted to the laser phase controller to ensure that the phases of multiple laser beams remain consistent. The laser signals of different wavelengths are then combined through the laser and microwave multiplexer / demultiplexer and transmitted to the middle part of the primary mirror in the form of a parallel laser beam. The beam passes through the primary mirror to the secondary mirror, and is reflected by the secondary mirror to the edge of the primary mirror before being emitted in parallel by the primary mirror, thereby realizing the transmission of the laser signal.

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