Ground station timing system

Abstract

The invention relates to the technical field of relay satellite ground stations, and particularly discloses a ground station timing system. Each timing device outputs a first timing signal and a second timing signal; the first switching equipment selects one of the first time service signals and divides the first time service signals into two paths for output; the first signal distribution equipment distributes one path of first time service signal into multiple paths of output; the first group of optical fiber transmission equipment converts the other path of first time service signal into an optical signal for transmission and then converts the optical signal back to an electric signal; the second signal distribution equipment distributes the first time service signals output by the first group of optical fiber transmission equipment into multiple paths for output; the second switching device selects one path of the second time service signals output by the timing system devices to output the second time service signals; the second group of optical fiber transmission equipment is used for converting the second time service signal into an optical signal for transmission and then converting the optical signal back to an electric signal; and the third signal distribution equipment distributes the second time service signals output by the second group of optical fiber transmission equipment into multiple paths for output. Therefore, the timing system design is simplified, and the signal quality is improved.

Description

Technical Field

[0001] This application relates to the field of relay satellite ground station technology, and in particular to a ground station timing system. Background Technology

[0002] In traditional technologies, to provide timing services to each subsystem within the measurement and control equipment, multiple types of timing signals are required for each subsystem. This often necessitates the timing synchronization equipment in the ground station's time unification system to provide multiple different types of timing signals (e.g., 10MHz signals, B-code timing signals, etc.). Current methods involve embedding input and output switching modules within the timing synchronization equipment. However, this approach, combined with the need for multiple types and numbers of signal outputs, significantly increases the design complexity, size, and weight of the timing synchronization equipment. To meet the timing requirements of numerous subsystems at the ground station, the timing synchronization equipment would require at least a 4U chassis. Furthermore, timing synchronization equipment is typically located in a computer room, far from the central control station. To meet the timing requirements of various subsystems at the central control station, a large number of long wiring harnesses are often required, which is inconvenient for actual cabling and may affect signal quality. Summary of the Invention

[0003] Therefore, it is necessary to provide a ground station timing system to address the above problems, including: At least two timing devices are provided, with the input of each timing device connected to a reference source and the output of each timing device outputting a first timing signal and a second timing signal. The first switching device, whose input is connected to the output of each of the time synchronization devices, is configured to select one of the first timing signals output by each of the time synchronization devices and split it into two outputs. The first signal distribution device, whose input is connected to the output of the first switching device, is configured to distribute one first timing signal output by the first switching device into multiple outputs; The first set of optical fiber transmission equipment is connected to the output end of the first switching equipment and is used to convert another first timing signal output by the first switching equipment into an optical signal for transmission and then convert it back into an electrical signal. The second signal distribution device, whose input end is connected to the output end of the first group of optical fiber transmission devices, is configured to distribute the first timing signal output by the first group of optical fiber transmission devices into multiple outputs. The second switching device has its input terminal connected to the output terminal of each of the time synchronization devices and is configured to select one of the second timing signals output by each of the time synchronization devices for output; The second set of optical fiber transmission equipment is connected to the output end of the second switching equipment and is used to convert the second timing signal output by the second switching equipment into an optical signal for transmission and then convert it back into an electrical signal. The third signal distribution device, whose input end is connected to the output end of the second group of optical fiber transmission devices, is configured to distribute the second timing signal output by the second group of optical fiber transmission devices into multiple outputs.

[0004] In one embodiment, the first timing signal includes a 10MHz frequency standard signal, and the second timing signal includes a B-code timing signal.

[0005] In one embodiment, the number of time synchronization devices is two, namely a first time synchronization device and a second time synchronization device; The first switching device is configured to automatically select the first timing signal output by the other of the two timing devices as the output when one of the first timing device and the second timing device malfunctions. The second switching device is configured to automatically select the second timing signal output by the other of the two timing devices as the output when one of the first timing device and the second timing device malfunctions.

[0006] In one embodiment, the output terminals of each of the timing devices, the first switching device, the first signal distribution device, the second signal distribution device, the second switching device, and the third signal distribution device are all connected to a monitoring server and are configured to report their respective status data to the monitoring server.

[0007] In one embodiment, the first set of optical fiber transmission equipment includes a first radio frequency optical transceiver installed inside the equipment room and a second radio frequency optical transceiver installed at the central body. The first switching device, the first radio frequency optical transceiver, the second radio frequency optical transceiver, and the second signal distribution device are connected in sequence. The first radio frequency optical transceiver is used to convert the first timing signal output by the first switching device from an electrical signal to an optical signal. The second radio frequency optical transceiver is used to convert the optical signal output by the first radio frequency optical transceiver back into an electrical signal and transmit it to the second signal distribution device.

[0008] In one embodiment, the second set of optical fiber transmission equipment includes a first serial port optical transceiver installed inside the equipment room and a second serial port optical transceiver installed at the central body. The second switching device, the first serial optical transceiver, the second serial optical transceiver, and the third signal distribution device are connected in sequence. The first serial optical transceiver is used to convert the second timing signal output by the second switching device from an electrical signal to an optical signal. The second serial optical transceiver is used to convert the optical signal output by the first serial optical transceiver back to an electrical signal and transmit it to the third signal distribution device.

[0009] In one embodiment, the output terminals of each of the time synchronization devices also output TOD serial port signals; The first switching device is further configured to select one of the TOD serial port signals output by each of the time synchronization devices and split it into two outputs; one TOD serial port signal is output to the first signal distribution device, and the other TOD serial port signal is converted into an optical signal by a third set of optical fiber transmission devices for transmission and then converted back into an electrical signal, and finally output to the second signal distribution device. The second switching device is further configured to select one output from each TOD serial port signal output by each of the time synchronization devices; the output TOD serial port signal is converted into an optical signal by the fourth set of optical fiber transmission devices for transmission and then converted into an electrical signal, and finally output to the third signal distribution device.

[0010] In one embodiment, the third set of optical fiber transmission equipment includes a third serial port optical transceiver installed inside the equipment room and a fourth serial port optical transceiver installed at the central body. The first switching device, the third serial optical transceiver, the fourth serial optical transceiver, and the second signal distribution device are connected in sequence. The third serial optical transceiver is used to convert the TOD serial port signal output by the first switching device from an electrical signal to an optical signal. The fourth serial optical transceiver is used to convert the optical signal output by the third serial optical transceiver back to an electrical signal and transmit it to the second signal distribution device.

[0011] In one embodiment, the fourth set of optical fiber transmission equipment includes a fifth serial port optical transceiver installed inside the equipment room and a sixth serial port optical transceiver installed at the central body. The second switching device, the fifth serial optical transceiver, the sixth serial optical transceiver, and the third signal distribution device are connected in sequence. The fifth serial optical transceiver is used to convert the TOD serial port signal output by the second switching device from an electrical signal to an optical signal. The sixth serial optical transceiver is used to convert the optical signal output by the fifth serial optical transceiver back to an electrical signal and transmit it to the third signal distribution device.

[0012] In one embodiment, each of the time synchronization devices provides NTP service, and the time synchronization devices perform redundant backups for the NTP service.

[0013] The ground station timing system provided in this application embodiment includes multiple timing devices, each capable of simultaneously outputting a first timing signal and a second timing signal. The first and second timing signals are of different types and perform different functions; that is, each timing device integrates the functions of multiple timing devices providing different timing services. A first switching device is configured to select one of the first timing signals output from each timing device and split it into two outputs. One first timing signal can be distributed into multiple outputs via a first signal distribution device, thereby providing timing services to relevant equipment in various subsystems of the ground station located in the equipment room. Simultaneously, the other first timing signal can be converted into an optical signal by a first set of fiber optic transmission equipment, transmitted, converted back into an electrical signal, and then distributed into multiple outputs by a second signal distribution device. In practical applications, this other first timing signal can be transmitted via fiber optic cable to the central hub, thereby providing timing services to relevant equipment in various subsystems of the ground station located at the central hub. In addition, the second switching device is configured to select one output from each second timing signal output by each timing device, and then convert it into an optical signal for transmission by the second set of optical fiber transmission equipment, and then convert it into an electrical signal, and then distribute it into multiple outputs by the third signal distribution equipment. In practical applications, the above-mentioned second timing signal can be transmitted to the central body via optical fiber, and then provide timing services for the relevant equipment of each subsystem of the ground station located at the central body.

[0014] Therefore, multiple timing devices can achieve redundancy and mutual backup. Various switching devices can perform corresponding redundant switching for different types of timing signals. Through the cooperation of various timing devices, switching devices, and signal distribution devices, the output requirements of multiple types and multiple channels of signals can be met. Compared with traditional technologies, this reduces the design complexity of timing devices, significantly reduces their size, and lightens their weight. Furthermore, by configuring various fiber optic transmission devices, timing signals can be converted into optical signals for transmission, solving the problem of signal quality degradation caused by long-distance transmission. This provides a unified time reference for relevant equipment in various subsystems located locally (e.g., in a data center) and remotely (e.g., at the central station). Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a ground station timing system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a ground station timing system provided in another embodiment of this application.

[0016] Explanation of reference numerals in the attached figures: 100. Reference source; 200. Timekeeping device; 210. First timekeeping device; 220. Second timekeeping device; 310. First switching device; 320. Second switching device; 410. First signal distribution device; 420. Second signal distribution device; 430. Third signal distribution device; 510. First set of fiber optic transmission equipment; 511. First radio frequency optical transceiver; 512. Second radio frequency optical transceiver; 520. Second group of fiber optic transmission equipment; 521. First serial port optical transceiver; 522. Second serial port optical transceiver; 530. Third group of fiber optic transmission equipment; 531. Third serial port optical transceiver; 532. Fourth serial port optical transceiver; 540. Fourth group of fiber optic transmission equipment; 541. Fifth serial port optical transceiver; 542. Sixth serial port optical transceiver. Detailed Implementation

[0017] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0018] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0019] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] A ground station time unification system typically includes a time server, B-code terminals, and rubidium frequency standards. The time server used by the ground station is usually an NTP (Network Time Protocol) time server, a device that provides time synchronization based on the Network Time Protocol (NTP). Its synchronization accuracy is <10ms in a local area network (LAN) environment and <100ms in a wide area network (WAN) environment. The NTP time server can provide time synchronization services for ground station equipment with lower time accuracy requirements (e.g., baseband subsystems, data storage and forwarding subsystems, and support subsystems, typically requiring millisecond-level accuracy). The B-code terminal is a device that uses B-code time synchronization. The B-code standard meets the "GJB2991A-2008B General Specification for Time Code Interface Terminals". DC codes achieve a synchronization error of ≤200ns through direct level transmission, while AC codes experience a delay of ≤10μs due to the modulation and demodulation process. B-code terminals can provide time synchronization services for monitoring subsystems, antenna feeder subsystems, and channel subsystems with higher time accuracy requirements. A rubidium frequency standard is a device that provides a 10MHz frequency. Its main function is to provide a 10MHz frequency standard for measurement and control equipment (such as measurement and control baseband, data transmission baseband, tracking receiver, upconverter, downconverter, etc.).

[0022] The following is a brief introduction to the measurement and control equipment: The measurement, control, and operation equipment mainly includes a monitoring subsystem, an antenna feeder subsystem, a channel subsystem, a baseband subsystem, a data storage and forwarding subsystem, and a support subsystem.

[0023] Among them, the monitoring subsystem can remotely monitor and control other subsystems, and is also the process organizer and command sender for each subsystem in automated operation.

[0024] The antenna-feed-distribution system mainly consists of the antenna feeder system, servo system, and auxiliary equipment. The antenna feeder system mainly includes antennas and feed lines, and some antennas also have radomes. The antenna-feed-distribution system is mainly used to control the antenna's pointing towards the satellite, and to receive and calculate satellite angle, telemetry, distance, and high-speed data transmission data through the antenna. It can also send direction measurement, remote control commands, and injection data to the satellite. Angle, telemetry, distance, and high-speed data transmission data are collectively referred to as downlink data, while direction measurement, remote control commands, and injection data are collectively referred to as uplink data.

[0025] The channel subsystem connects to both the antenna feeder subsystem and the baseband subsystem. The channel subsystem mainly includes a low-noise amplifier, frequency converters, power amplifiers, a switching matrix, and interconnecting cables. The channel subsystem receives downlink signals from the antenna feeder subsystem, amplifies, converts, and filters them before transmitting them to the baseband subsystem. It also receives uplink signals from the baseband subsystem, amplifies, converts, and filters them before transmitting them to the antenna feeder subsystem. The power amplifier amplifies the uplink signal. The low-noise amplifier amplifies the downlink signal. The frequency converter consists of upconverters and downconverters; the downconverter converts the downlink signal, and the upconverter converts the uplink signal.

[0026] The baseband subsystem mainly includes the telemetry and control baseband and the high-speed data transmission baseband. The telemetry and control baseband includes demodulators and modulators, used to demodulate downlink telemetry and distance data and modulate uplink remote control and injection data. The high-speed data transmission baseband mainly contains demodulators, used to demodulate downlink high-speed data transmission data.

[0027] The data storage and forwarding subsystem is mainly used to store satellite-transmitted data and forward it to users or other devices in a categorized manner.

[0028] In addition, the measurement, operation and control equipment also includes subsystems such as equipment support, power supply and management system, and security monitoring system.

[0029] The various subsystems of the ground station are often located in different places. For example, the equipment of the monitoring subsystem, baseband subsystem, data storage and forwarding subsystem, and support subsystem are mostly concentrated in the equipment room (or container); while the equipment of the satellite feeder subsystem, channel subsystem, and other related equipment are mostly concentrated in the center of the satellite antenna.

[0030] In traditional technologies, to provide timing services to each subsystem within the measurement and control equipment, multiple types of timing signals are required for each subsystem. This often necessitates the timing synchronization equipment in the ground station's time unification system to provide multiple different types of timing signals (e.g., 10MHz signals, B-code timing signals, etc.). Current methods involve embedding input and output switching modules within the timing synchronization equipment. However, this approach, combined with the need for multiple types and numbers of signal outputs, significantly increases the design complexity, size, and weight of the timing synchronization equipment. To meet the timing needs of numerous subsystems at the ground station, the timing synchronization equipment must be at least a 4U chassis. Furthermore, timing synchronization equipment is typically located in a computer room, far from the central control station. To meet the timing needs of various subsystems at the central control station, a large number of wiring harnesses are often required, and these harnesses are quite long, which is inconvenient for actual cabling construction. The length of the wiring harnesses can approach 100 meters, and in special cases exceed 100 meters. Using traditional coaxial cables and harnesses can negatively impact signal quality, including attenuation and delay.

[0031] To address the aforementioned issues, this application provides a ground station time synchronization system, which can be a medium-orbit relay satellite ground station time synchronization system. This system provides time synchronization services to various subsystems within the telemetry, tracking, and command (TT&C) equipment and provides a time reference for each subsystem.

[0032] Reference Figure 1 The ground station timing system provided in this embodiment includes at least two timing devices 200, a first switching device 310, a second switching device 320, a first signal distribution device 410, a second signal distribution device 420, a third signal distribution device 430, a first set of optical fiber transmission devices 510, and a second set of optical fiber transmission devices 520.

[0033] In this system, the input terminal of each timing device 200 is connected to the reference source 100, and the output terminal of each timing device 200 outputs a first timing signal and a second timing signal. The input terminal of a first switching device 310 is connected to the output terminal of each timing device 200, and it is configured to select one of the first timing signals output by each timing device 200 and split it into two outputs. The input terminal of a second switching device 320 is connected to the output terminal of each timing device 200, and it is configured to select one of the second timing signals output by each timing device 200 and output it. The input terminal of a first signal distribution device 410 is connected to the output terminal of the first switching device 310, and it is configured to distribute one first timing signal output by the first switching device 310 into multiple outputs. A first set of optical fiber transmission devices 510 is connected to the output terminal of the first switching device 310, and is used to convert another first timing signal output by the first switching device 310 into an optical signal for transmission and then convert it back into an electrical signal. The input of the second signal distribution device 420 is connected to the output of the first group of optical fiber transmission devices 510, and is configured to distribute the first timing signal output by the first group of optical fiber transmission devices 510 into multiple outputs. The second group of optical fiber transmission devices 520 is connected to the output of the second switching device 320, and is used to convert the second timing signal output by the second switching device 320 into an optical signal for transmission and then convert it back into an electrical signal. The input of the third signal distribution device 430 is connected to the output of the second group of optical fiber transmission devices 520, and is configured to distribute the second timing signal output by the second group of optical fiber transmission devices 520 into multiple outputs.

[0034] The ground station timing system provided in this application embodiment includes multiple timing devices, each capable of simultaneously outputting a first timing signal and a second timing signal. The first and second timing signals are of different types and perform different functions; that is, each timing device integrates the functions of multiple timing devices providing different timing services. A first switching device is configured to select one of the first timing signals output from each timing device and split it into two outputs. One first timing signal can be distributed into multiple outputs via a first signal distribution device, thereby providing timing services to relevant equipment in various subsystems of the ground station located in the equipment room. Simultaneously, the other first timing signal can be converted into an optical signal by a first set of fiber optic transmission equipment, transmitted, converted back into an electrical signal, and then distributed into multiple outputs by a second signal distribution device. In practical applications, this other first timing signal can be transmitted via fiber optic cable to the central hub, thereby providing timing services to relevant equipment in various subsystems of the ground station located at the central hub. In addition, the second switching device is configured to select one output from each second timing signal output by each timing device, and then convert it into an optical signal for transmission by the second set of optical fiber transmission equipment, and then convert it into an electrical signal, and then distribute it into multiple outputs by the third signal distribution equipment. In practical applications, the above-mentioned second timing signal can be transmitted to the central body via optical fiber, and then provide timing services for the relevant equipment of each subsystem of the ground station located at the central body.

[0035] Therefore, multiple timing devices can achieve redundancy and mutual backup. Various switching devices can perform corresponding redundant switching for different types of timing signals. Through the cooperation of various timing devices, switching devices, and signal distribution devices, the output requirements of multiple types and multiple channels of signals can be met. Compared with traditional technologies, this reduces the design complexity of timing devices, significantly reduces their size and weight, and lowers installation difficulty. Furthermore, by configuring various fiber optic transmission devices, timing signals can be converted into optical signals for transmission, solving the problem of signal quality degradation caused by long-distance transmission. This provides a unified time reference for related equipment in various subsystems located locally (e.g., in a data center) and remotely (e.g., at the central station).

[0036] Reference Figure 2 In one embodiment, the first timing signal includes a 10MHz frequency standard signal ( Figure 2 (referred to as 10MHz in Chinese), the second timing signal includes the B-code timing signal ( Figure 2 (abbreviated as B code in Chinese).

[0037] The B-code standard includes two modulation methods: DC and AC. DC code uses pulse width modulation (2ms or 5ms high level represents binary 0 / 1) and is suitable for short-distance transmission, while AC code can achieve long-distance synchronization through sine wave modulation. Common interfaces for DC code are suitable for transmitting differential signals such as TTL and RS422 / 485.

[0038] In addition, each of the time synchronization devices 200 can provide NTP service, and each of the time synchronization devices 200 performs redundant backup for NTP service, which can automatically achieve mutual backup and switching.

[0039] In this embodiment, the reference source 100 may include the Global Positioning System or the BeiDou satellite, and each timing device 200 can obtain time information from the Global Positioning System or the BeiDou satellite.

[0040] Reference Figure 2 In one embodiment, the number of time synchronization devices 200 is two, namely a first time synchronization device 210 and a second time synchronization device 220. The first time synchronization device 210 and the second time synchronization device 220 serve as backups for each other, providing dual-machine hot backup functionality for NTP services. In this embodiment, setting two time synchronization devices 200 is sufficient to meet the requirements, avoiding the need to add too many time synchronization devices 200, which would result in an excessively large overall system size.

[0041] In one embodiment, the first switching device 310 may be configured to automatically select the first timing signal output by the other of the first timing devices 210 and the second timing devices 220 as the output when one of them is malfunctioning.

[0042] The first switching device 310 may include a 10MHz frequency standard dual-machine switching device, which has a two-input source selection function. One 10MHz frequency standard signal from the first timing device 210 and one 10MHz frequency standard signal from the second timing device 220 are both output to the 10MHz frequency standard dual-machine switching device. The 10MHz frequency standard dual-machine switching device can determine whether there is an abnormality in the two input 10MHz frequency standard signals. If one input signal is abnormal, the other input signal can be automatically used as the output, thereby realizing redundant switching of the 10MHz frequency standard signal.

[0043] In one embodiment, the second switching device 320 may be configured to automatically select the second timing signal output by the other of the two timing devices as the output when one of the first timing device 210 and the second timing device 220 is malfunctioning.

[0044] The second switching device 320 may include a B-code dual-machine switching device, which has a two-input source selection function. One B-code timing signal from the first timing device 210 and one B-code timing signal from the second timing device 220 are both output to the B-code dual-machine switching device. The B-code dual-machine switching device can determine whether there is an abnormality in the two input B-code timing signals. If one input signal is abnormal, it can automatically use the other input signal as the output, thereby realizing redundant switching of the B-code timing signals.

[0045] In this embodiment, the B-code timing signal can be transmitted based on the RS422 communication protocol. RS422 is a differential serial communication standard suitable for high-speed, interference-resistant data transmission.

[0046] In a specific example, each signal distribution device can distribute the received timing signal into eight outputs to the corresponding subsystem devices to provide the corresponding timing service. That is, through the secondary cascading distribution function of each signal distribution device, two-level distribution can be performed to expand the number of signal channels.

[0047] In this embodiment, each timing device, each switching device, and the first signal distribution device can be located in the computer room, while the second and third signal distribution devices can be located at the central body. Each set of fiber optic transmission devices can be connected between the corresponding switching device in the computer room and the corresponding signal distribution device at the central body to achieve long-distance transmission of timing signals.

[0048] In one embodiment, the output terminals of each of the timing devices 200, the first switching device 310, the first signal distribution device 410, the second signal distribution device 420, the second switching device 320, and the third signal distribution device 430 are all connected to a monitoring server and configured to report their respective status data to the monitoring server. Specifically, each switching device can report its local device status, input source status, and output status to the monitoring server, while each signal distribution device can report its input status, local device status, and output status to the monitoring server. This enables the monitoring server to uniformly monitor and manage all devices.

[0049] In one embodiment, the first group of optical fiber transmission equipment 510 includes a first radio frequency optical transceiver 511 disposed inside the equipment room and a second radio frequency optical transceiver 512 disposed at the central body. The first switching device 310, the first radio frequency optical transceiver 511, the second radio frequency optical transceiver 512, and the second signal distribution device 420 are connected in sequence. The first radio frequency optical transceiver 511 is used to convert the first timing signal output by the first switching device 310 from an electrical signal to an optical signal. The second radio frequency optical transceiver 512 is used to convert the optical signal output by the first radio frequency optical transceiver 511 back to an electrical signal and transmit it to the second signal distribution device 420.

[0050] In one embodiment, the second set of optical fiber transmission equipment 520 includes a first serial port optical transceiver 521 installed inside the equipment room and a second serial port optical transceiver 512 installed at the central body. The second switching device 320, the first serial optical transceiver 521, the second serial optical transceiver 512, and the third signal distribution device 430 are connected in sequence. The first serial optical transceiver 521 is used to convert the second timing signal output by the second switching device 320 from an electrical signal to an optical signal. The second serial optical transceiver 512 is used to convert the optical signal output by the first serial optical transceiver 521 back to an electrical signal and transmit it to the third signal distribution device 430.

[0051] In one embodiment, the output terminals of each of the time synchronization devices 200 also output TOD (Time of Day) serial port signals. Figure 2 The TOD serial port signal is referred to as TOD.

[0052] The first switching device 310 is further configured to select one of the TOD serial port signals output from each of the timing devices 200 and split it into two outputs; one TOD serial port signal is output to the first signal distribution device 410 for use in reporting status data. The other TOD serial port signal is converted into an optical signal by the third set of optical fiber transmission devices 530 for transmission and then converted back into an electrical signal, and finally output to the second signal distribution device 420 for use in reporting status data.

[0053] The first switching device 310 can be further configured to automatically switch to the TOD serial port signal output by another time synchronization device 200 as the input signal when the TOD serial port signal output by one of the time synchronization devices 200 is abnormal, thereby realizing redundant switching of serial port signals.

[0054] The second switching device 320 is also configured to select one of the TOD serial port signals output from each of the time synchronization devices 200 for output; the output TOD serial port signal is converted into an optical signal by the fourth group of optical fiber transmission devices 540 for transmission and then converted into an electrical signal, and finally output to the third signal distribution device 430 for use by the third signal distribution device 430 to report status data.

[0055] The second switching device 320 can be further configured to automatically switch to the TOD serial port signal output by the other timing device 200 as the input signal when the TOD serial port signal output by one of the timing devices 200 is abnormal, thereby realizing redundant switching of serial port signals.

[0056] In this embodiment, the TOD serial port signal can be transmitted based on the RS422 communication protocol.

[0057] In one embodiment, the third set of optical fiber transmission equipment 530 includes a third serial port optical transceiver 531 installed inside the equipment room and a fourth serial port optical transceiver 532 installed at the central body. The first switching device 310, the third serial optical transceiver 531, the fourth serial optical transceiver 532, and the second signal distribution device 420 are connected in sequence. The third serial optical transceiver 531 is used to convert the TOD serial port signal output by the first switching device 310 from an electrical signal to an optical signal. The fourth serial optical transceiver 532 is used to convert the optical signal output by the third serial optical transceiver 531 back to an electrical signal and transmit it to the second signal distribution device 420.

[0058] In one embodiment, the fourth set of optical fiber transmission equipment 540 includes a fifth serial port optical transceiver 541 installed inside the equipment room and a sixth serial port optical transceiver 542 installed at the central body. The second switching device 320, the fifth serial optical transceiver 541, the sixth serial optical transceiver 542, and the third signal distribution device 430 are connected in sequence. The fifth serial optical transceiver 541 is used to convert the TOD serial port signal output by the second switching device 320 from an electrical signal to an optical signal. The sixth serial optical transceiver 542 is used to convert the optical signal output by the fifth serial optical transceiver 541 back to an electrical signal and transmit it to the third signal distribution device 430.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A ground station timing system, characterized in that, include: At least two timing devices are provided, with the input of each timing device connected to a reference source and the output of each timing device outputting a first timing signal and a second timing signal. The first switching device, whose input is connected to the output of each of the time synchronization devices, is configured to select one of the first timing signals output by each of the time synchronization devices and split it into two outputs. The first signal distribution device, whose input is connected to the output of the first switching device, is configured to distribute one first timing signal output by the first switching device into multiple outputs; The first set of optical fiber transmission equipment is connected to the output end of the first switching equipment and is used to convert another first timing signal output by the first switching equipment into an optical signal for transmission and then convert it back into an electrical signal. The second signal distribution device, whose input end is connected to the output end of the first group of optical fiber transmission devices, is configured to distribute the first timing signal output by the first group of optical fiber transmission devices into multiple outputs. The second switching device has its input terminal connected to the output terminal of each of the time synchronization devices and is configured to select one of the second timing signals output by each of the time synchronization devices for output; The second set of optical fiber transmission equipment is connected to the output end of the second switching equipment and is used to convert the second timing signal output by the second switching equipment into an optical signal for transmission and then convert it back into an electrical signal. The third signal distribution device, whose input end is connected to the output end of the second group of optical fiber transmission devices, is configured to distribute the second timing signal output by the second group of optical fiber transmission devices into multiple outputs.

2. The ground station timing system according to claim 1, characterized in that, The first timing signal includes a 10MHz frequency standard signal, and the second timing signal includes a B-code timing signal.

3. The ground station timing system according to claim 1, characterized in that, The number of time synchronization devices is two, namely a first time synchronization device and a second time synchronization device; The first switching device is configured to automatically select the first timing signal output by the other of the two timing devices as the output when one of the first timing device and the second timing device malfunctions. The second switching device is configured to automatically select the second timing signal output by the other of the two timing devices as the output when one of the first timing device and the second timing device malfunctions.

4. The ground station timing system according to claim 1, characterized in that, The output terminals of each of the timing devices, the first switching device, the first signal distribution device, the second signal distribution device, the second switching device, and the third signal distribution device are all connected to the monitoring server and are configured to report their respective status data to the monitoring server.

5. The ground station timing system according to claim 1, characterized in that, The first set of fiber optic transmission equipment includes a first radio frequency optical transceiver installed inside the equipment room and a second radio frequency optical transceiver installed at the central body; The first switching device, the first radio frequency optical transceiver, the second radio frequency optical transceiver, and the second signal distribution device are connected in sequence. The first radio frequency optical transceiver is used to convert the first timing signal output by the first switching device from an electrical signal to an optical signal. The second radio frequency optical transceiver is used to convert the optical signal output by the first radio frequency optical transceiver back into an electrical signal and transmit it to the second signal distribution device.

6. The ground station timing system according to claim 1, characterized in that, The second set of fiber optic transmission equipment includes a first serial port optical transceiver installed inside the equipment room and a second serial port optical transceiver installed at the central body; The second switching device, the first serial optical transceiver, the second serial optical transceiver, and the third signal distribution device are connected in sequence. The first serial optical transceiver is used to convert the second timing signal output by the second switching device from an electrical signal to an optical signal. The second serial optical transceiver is used to convert the optical signal output by the first serial optical transceiver back to an electrical signal and transmit it to the third signal distribution device.

7. The ground station timing system according to claim 4, characterized in that, The output terminals of each of the aforementioned timing devices also output TOD serial port signals; The first switching device is further configured to select one of the TOD serial port signals output by each of the time synchronization devices and split it into two outputs; one TOD serial port signal is output to the first signal distribution device, and the other TOD serial port signal is converted into an optical signal by a third set of optical fiber transmission devices for transmission and then converted back into an electrical signal, and finally output to the second signal distribution device. The second switching device is further configured to select one output from each TOD serial port signal output by each of the time synchronization devices; the output TOD serial port signal is converted into an optical signal by the fourth set of optical fiber transmission devices for transmission and then converted into an electrical signal, and finally output to the third signal distribution device.

8. The ground station timing system according to claim 7, characterized in that, The third set of optical fiber transmission equipment includes a third serial port optical transceiver installed inside the computer room and a fourth serial port optical transceiver installed at the central body. The first switching device, the third serial optical transceiver, the fourth serial optical transceiver, and the second signal distribution device are connected in sequence. The third serial optical transceiver is used to convert the TOD serial port signal output by the first switching device from an electrical signal to an optical signal. The fourth serial optical transceiver is used to convert the optical signal output by the third serial optical transceiver back to an electrical signal and transmit it to the second signal distribution device.

9. The ground station timing system according to claim 7, characterized in that, The fourth group of optical fiber transmission equipment includes a fifth serial port optical transceiver installed inside the computer room and a sixth serial port optical transceiver installed at the central body. The second switching device, the fifth serial optical transceiver, the sixth serial optical transceiver, and the third signal distribution device are connected in sequence. The fifth serial optical transceiver is used to convert the TOD serial port signal output by the second switching device from an electrical signal to an optical signal. The sixth serial optical transceiver is used to convert the optical signal output by the fifth serial optical transceiver back to an electrical signal and transmit it to the third signal distribution device.

10. The ground station timing system according to claim 1, characterized in that, Each of the aforementioned time synchronization devices provides NTP service, and the NTP service is redundantly backed up among the aforementioned time synchronization devices.

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