CN109714125B - Method and system for synchronizing wireless time between satellite cabins and satellite - Google Patents
Method and system for synchronizing wireless time between satellite cabins and satellite Download PDFInfo
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- CN109714125B CN109714125B CN201910017427.5A CN201910017427A CN109714125B CN 109714125 B CN109714125 B CN 109714125B CN 201910017427 A CN201910017427 A CN 201910017427A CN 109714125 B CN109714125 B CN 109714125B
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Abstract
The invention provides a method, a system and a satellite for wireless time synchronization among satellite cabins, wherein the method comprises the following steps: step A: the satellite cabin section A wireless microwave communication terminal receives the GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal, and local time of the satellite cabin section A wireless microwave communication terminal is updated; and B: the satellite cabin section A wireless microwave communication terminal sends first time code information to the satellite cabin section B wireless microwave communication terminal in a wireless communication mode; and C: and the satellite cabin section B wireless microwave communication terminal synchronizes the local time of the satellite cabin section B wireless microwave communication terminal according to the first time code information. The invention solves the problem of high-precision time synchronization of the satellite cabin section A and the satellite cabin section B in a wireless state, provides a reasonable and easily-realized high-precision wireless time synchronization method, and has high engineering application value.
Description
Technical Field
The invention relates to the technical field of satellite time synchronization, in particular to a method and a system for wireless time synchronization between satellite cabins and a satellite. In particular to a wireless time synchronization method between satellite cabins.
Background
Time is of great importance in various fields as a basic physical quantity. The high-precision time synchronization technology is the key for realizing a high-precision time system, is also an important basis for establishing a satellite navigation positioning system, directly influences the navigation, positioning and time service precision of the system, and has important influence on the satellite performance.
Due to the requirement of complex tasks on a high-performance platform, the satellite adopting the two-cabin separation type design has higher precision and stability, has huge application potential, and is one of the development trends of future satellite design. In the two-cabin separation type design, the physical influence between the two cabins can be effectively isolated by adopting a wireless communication technology between the cabins, and the two-cabin separation type design has an important significance for improving the performance of the satellite. The attack and the clearance research of the wireless communication technology between cabins is urgent, and higher requirements are put forward on the high-precision wireless time synchronization technology between cabins.
The current time synchronization method mainly aims at the research of time system synchronization between a satellite and the ground, the research of the cabin-to-cabin wireless time synchronization method with cabin-type design is less, the precision cannot completely meet the requirement of the satellite on high precision of the system synchronization, and the feasibility and the reliability are all to be improved.
For example, patent document CN102882586A (application No. 201210390636.2) discloses a satellite time synchronization system including a time transmission section, and a time reception section. The time transmitting part receives GNSS navigation signals, generates accurate UTC time and transmits second pulses corresponding to the whole second time of UTC. The time transmission section transmits the pulse-per-second and the UTC full-second time information corresponding to the pulse-per-second to the time reception section. The time receiving part receives the pulse per second and UTC whole second time information corresponding to the pulse per second, the pulse per second is used for triggering, and the counting is carried out through a local clock, so that the accurate current time is obtained.
This patent document does not relate to wireless time synchronization between compartments of a capsule design.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for wireless time synchronization between satellite cabins and a satellite.
The invention provides a wireless time synchronization method between satellite cabins, which comprises the following steps:
step A: the satellite cabin section A wireless microwave communication terminal receives a GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal, updates the local time of the satellite cabin section A wireless microwave communication terminal according to the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal, and sends the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal to the satellite cabin section A satellite-borne computer; wherein, the GPS/Beidou means: a GPS or Beidou satellite navigation system;
and B: the satellite cabin section A wireless microwave communication terminal sends first time code information corresponding to the GPS/Beidou second pulse signal to the satellite cabin section B wireless microwave communication terminal in a wireless communication mode;
and C: the satellite cabin section B wireless microwave communication terminal synchronizes the local time of the satellite cabin section B wireless microwave communication terminal according to the first time code information corresponding to the GPS/Beidou second pulse signal, and sends a time pulse signal and second time code information corresponding to the time second pulse signal to the satellite cabin section B satellite-borne computer;
step D: the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B respectively synchronize the single-machine time in the satellite cabin section A and the single-machine time in the satellite cabin section B at a preset frequency.
Preferably, step a comprises:
step A1: the GPS/Beidou receiver of the satellite cabin section A outputs a GPS/Beidou second pulse signal to the wireless microwave communication terminal of the satellite cabin section A through an OC door, and outputs first time code information corresponding to the GPS/Beidou second pulse to the wireless microwave communication terminal of the satellite cabin section A through an asynchronous RS422 interface;
step A2: the satellite cabin section A wireless microwave communication terminal receives the GPS/Beidou second pulse signal through an OC door and receives first time code information corresponding to the GPS/Beidou second pulse through an asynchronous RS422 interface; wherein the low level leading edge of the GPS/Beidou second pulse signal is valid;
step A3: the satellite cabin section A wireless microwave communication terminal updates the local time of the satellite cabin section A wireless microwave communication terminal according to the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse;
step A4: and the satellite cabin section A wireless microwave communication terminal sends the GPS/Beidou second pulse signal and the first time code information to the satellite cabin section A satellite-borne computer.
Preferably, step C comprises:
step C1: the satellite cabin section B wireless microwave communication terminal synchronizes the local time of the satellite cabin section B wireless microwave communication terminal according to the received first time code information corresponding to the GPS/Beidou second pulse signal, the satellite cabin section B wireless microwave communication terminal outputs a time pulse signal to the single machine of the satellite cabin section B through an OC door, and outputs second time code information corresponding to the time second pulse signal to the single machine of the satellite cabin section B through an asynchronous RS422 interface;
step C2: the single machine of the satellite cabin section B synchronizes local time according to the time second pulse signal and second time code information corresponding to the time second pulse signal;
step C3: and the satellite cabin B wireless microwave communication terminal outputs the time-second pulse signal and second time code information corresponding to the time-second pulse signal to the satellite-borne computer of the satellite cabin B.
Preferably, step D comprises:
step D1: the satellite-borne computer of the satellite cabin section A and the satellite-borne computer of the satellite cabin section B respectively send time information broadcast to the single machine of the satellite cabin section A and the single machine of the satellite cabin section B through serial ports every other preset time period;
step D2: the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B send time synchronization pulses to the single machine every second preset time period;
step D3: and broadcasting the time information and synchronizing the local time by the time pulse according to the time information of the stand-alone needing time synchronization in the satellite cabin section A and the stand-alone needing time synchronization in the satellite cabin section B.
The invention provides a wireless time synchronization system between satellite cabins, which comprises:
GPS/Beidou receiver: outputting a GPS/Beidou second pulse signal to a satellite cabin section A wireless microwave communication terminal, and outputting first time code information corresponding to the GPS/Beidou second pulse to the satellite cabin section A wireless microwave communication terminal;
satellite cabin section A wireless microwave communication terminal: receiving the GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal, updating the local time of a satellite cabin section A wireless microwave communication terminal according to the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal, sending the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal to a satellite cabin section A satellite-borne computer, and sending the first time code information corresponding to the GPS/Beidou second pulse signal to a satellite cabin section B wireless microwave communication terminal;
satellite cabin B wireless microwave communication terminal: synchronizing the local time of the wireless microwave communication terminal of the satellite cabin section B according to the first time code information corresponding to the GPS/Beidou second pulse signal, and sending a time pulse signal and second time code information corresponding to the time second pulse signal to the satellite-borne computer of the satellite cabin section B;
satellite cabin section A satellite borne computer and satellite cabin section B satellite borne computer: the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B respectively synchronize the single-machine time in the satellite cabin section A and the single-machine time in the satellite cabin section B at a preset frequency.
Preferably, the GPS/Beidou receiver outputs a GPS/Beidou second pulse signal to the satellite cabin section A wireless microwave communication terminal through an OC door, and outputs first time code information corresponding to the GPS/Beidou second pulse to the satellite cabin section A wireless microwave communication terminal through an asynchronous RS422 interface.
Preferably, the satellite cabin section A wireless microwave communication terminal receives the GPS/Beidou second pulse signal through an OC door, and receives first time code information corresponding to the GPS/Beidou second pulse through an asynchronous RS422 interface; wherein the low level leading edge of the GPS/Beidou second pulse signal is valid;
the satellite cabin section A wireless microwave communication terminal updates local time according to the GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal;
and sending the GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal to a satellite-borne computer of a satellite cabin section A.
Preferably, the satellite cabin section B wireless microwave communication terminal synchronizes the local time of the satellite cabin section B wireless microwave communication terminal according to the received first time code information corresponding to the GPS/beidou second pulse signal, outputs a time pulse signal to the single machine of the satellite cabin section B through the OC door, and outputs second time code information corresponding to the time second pulse signal to the single machine of the satellite cabin section B through the asynchronous RS422 interface;
the single machine of the satellite cabin section B synchronizes local time according to the time second pulse signal and second time code information corresponding to the time second pulse signal;
and the satellite cabin B wireless microwave communication terminal outputs the time-second pulse signal and second time code information corresponding to the time-second pulse signal to the satellite-borne computer of the satellite cabin B.
Preferably, the satellite-borne computer of the satellite cabin section A and the satellite-borne computer of the satellite cabin section B respectively send time information broadcast to the single machine of the satellite cabin section A and the single machine of the satellite cabin section B through serial ports every other first preset time period;
the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B send time synchronization pulses to the single machine every second preset time period;
and broadcasting the time information and synchronizing the local time by the time pulse according to the time information of the stand-alone needing time synchronization in the satellite cabin section A and the stand-alone needing time synchronization in the satellite cabin section B.
According to the invention, the satellite comprises the inter-satellite-bay wireless time synchronization system.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a wireless time synchronization method between satellite cabins, which solves the time synchronization problem under the requirement of wireless communication between a satellite cabin section A and a satellite cabin section B and completes high-precision time synchronization of the satellite cabin section A and the satellite cabin section B in a wireless state. The invention takes GPS/Beidou second pulse signals in a satellite cabin section A as a reference, the leading edge time is not more than 50ns, and the pulse width is 1ms +/-100 us. Through reasonable signal transmission design and optimization, the time synchronization precision of the wireless microwave communication terminals between the two cabins can reach 200ns, and the consistency of the local absolute time of the wireless microwave communication terminals of the two satellite cabins is ensured. The invention provides a reasonable and easily-realized high-precision wireless time synchronization method for the time synchronization problem under the requirement of wireless communication between the satellite cabin section A and the satellite cabin section B, and has high engineering application value.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a flow chart illustrating a method for wireless time synchronization between satellite compartments according to the present invention.
Fig. 2 is a schematic flow chart of step a in the method for wireless time synchronization between satellite compartments according to the present invention.
Fig. 3 is a flowchart illustrating step C of the inter-satellite-pod wireless time synchronization method according to the present invention.
Fig. 4 is a flowchart illustrating step D of the inter-satellite-pod wireless time synchronization method according to the present invention.
Fig. 5 is a schematic diagram illustrating the principle of the inter-satellite-bay wireless time synchronization method according to the preferred embodiment of the invention.
Fig. 6 is a pulse-per-second timing chart of the output of the GPS/beidou receiver according to the preferred embodiment of the present invention.
Fig. 7 is a schematic diagram of time synchronization between a GPS/beidou receiver and a satellite cabin section a wireless microwave communication terminal according to a preferred embodiment of the invention.
Fig. 8 is a schematic diagram of time synchronization between a satellite cabin section a wireless microwave communication terminal and a satellite cabin section B wireless microwave communication terminal according to a preferred embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, a method for wireless time synchronization between satellite compartments according to the present invention includes:
step S101: the satellite cabin section A wireless microwave communication terminal receives a GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal, updates the local time of the satellite cabin section A wireless microwave communication terminal according to the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal, and sends the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal to the satellite cabin section A satellite-borne computer; wherein, the GPS/Beidou means: a GPS or Beidou satellite navigation system;
step S102: the satellite cabin section A wireless microwave communication terminal sends first time code information corresponding to the GPS/Beidou second pulse signal to the satellite cabin section B wireless microwave communication terminal in a wireless communication mode; furthermore, the satellite cabin section A wireless microwave communication terminal and the satellite cabin section B wireless microwave communication terminal keep 200ns time synchronization precision according to an inter-cabin measurement algorithm, and the local absolute time of the satellite cabin section B microwave communication terminal is consistent with the local absolute time of the satellite cabin section A.
Step S103: the satellite cabin section B wireless microwave communication terminal synchronizes the local time of the satellite cabin section B wireless microwave communication terminal according to the first time code information corresponding to the GPS/Beidou second pulse signal, and sends a time pulse signal and second time code information corresponding to the time second pulse signal to the satellite cabin section B satellite-borne computer;
step S104: the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B respectively synchronize the single-machine time in the satellite cabin section A and the single-machine time in the satellite cabin section B at a preset frequency.
Specifically, as shown in fig. 2, step S101 includes:
step S201: the GPS/Beidou receiver of the satellite cabin section A outputs a GPS/Beidou second pulse signal to the wireless microwave communication terminal of the satellite cabin section A through an OC door, and outputs first time code information corresponding to the GPS/Beidou second pulse to the wireless microwave communication terminal of the satellite cabin section A through an asynchronous RS422 interface;
step S202: the satellite cabin section A wireless microwave communication terminal receives the GPS/Beidou second pulse signal through an OC door and receives first time code information corresponding to the GPS/Beidou second pulse through an asynchronous RS422 interface; wherein the low level leading edge of the GPS/Beidou second pulse signal is valid;
step S203: the satellite cabin section A wireless microwave communication terminal updates the local time of the satellite cabin section A wireless microwave communication terminal according to the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse;
step S204: and the satellite cabin section A wireless microwave communication terminal sends the GPS/Beidou second pulse signal and the first time code information to the satellite cabin section A satellite-borne computer.
Specifically, as shown in fig. 3, step S103 includes:
step S301: the satellite cabin section B wireless microwave communication terminal synchronizes the local time of the satellite cabin section B wireless microwave communication terminal according to the received first time code information corresponding to the GPS/Beidou second pulse signal, the satellite cabin section B wireless microwave communication terminal outputs a time pulse signal to the single machine of the satellite cabin section B through an OC door, and outputs second time code information corresponding to the time second pulse signal to the single machine of the satellite cabin section B through an asynchronous RS422 interface;
step S302: the single machine of the satellite cabin section B synchronizes local time according to the time second pulse signal and second time code information corresponding to the time second pulse signal;
step S303: and the satellite cabin B wireless microwave communication terminal outputs the time-second pulse signal and second time code information corresponding to the time-second pulse signal to the satellite-borne computer of the satellite cabin B.
Specifically, as shown in fig. 4, step S104 includes:
step S401: the satellite-borne computer of the satellite cabin section A and the satellite-borne computer of the satellite cabin section B respectively send time information broadcast to the single machine of the satellite cabin section A and the single machine of the satellite cabin section B through serial ports every other preset time period;
step S402: the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B send time synchronization pulses to the single machine every second preset time period;
step S403: and broadcasting the time information and synchronizing the local time by the time pulse according to the time information of the stand-alone needing time synchronization in the satellite cabin section A and the stand-alone needing time synchronization in the satellite cabin section B.
As shown in fig. 5, the wireless time synchronization system between satellite compartments provided by the present invention can be implemented by the steps of the wireless time synchronization method between satellite compartments provided by the present invention. The person skilled in the art can understand the method for wireless time synchronization between satellite cabins as a preferred example of the system for wireless time synchronization between satellite cabins.
The invention provides a wireless time synchronization system between satellite cabins, which comprises:
GPS/Beidou receiver: outputting a GPS/Beidou second pulse signal to a satellite cabin section A wireless microwave communication terminal, and outputting first time code information corresponding to the GPS/Beidou second pulse to the satellite cabin section A wireless microwave communication terminal;
satellite cabin section A wireless microwave communication terminal: receiving the GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal, updating the local time of a satellite cabin section A wireless microwave communication terminal according to the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal, sending the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal to a satellite cabin section A satellite-borne computer, and sending the first time code information corresponding to the GPS/Beidou second pulse signal to a satellite cabin section B wireless microwave communication terminal;
satellite cabin B wireless microwave communication terminal: synchronizing the local time of the wireless microwave communication terminal of the satellite cabin section B according to the first time code information corresponding to the GPS/Beidou second pulse signal, and sending a time pulse signal and second time code information corresponding to the time second pulse signal to the satellite-borne computer of the satellite cabin section B;
satellite cabin section A satellite borne computer and satellite cabin section B satellite borne computer: the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B respectively synchronize the single-machine time in the satellite cabin section A and the single-machine time in the satellite cabin section B at a preset frequency.
Specifically, the GPS/Beidou receiver outputs a GPS/Beidou second pulse signal to the satellite cabin section A wireless microwave communication terminal through an OC door, and outputs first time code information corresponding to the GPS/Beidou second pulse to the satellite cabin section A wireless microwave communication terminal through an asynchronous RS422 interface.
Specifically, the satellite cabin section A wireless microwave communication terminal receives the GPS/Beidou second pulse signal through an OC door, and receives first time code information corresponding to the GPS/Beidou second pulse through an asynchronous RS422 interface; wherein the low level leading edge of the GPS/Beidou second pulse signal is valid;
the satellite cabin section A wireless microwave communication terminal updates local time according to the GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal;
and sending the GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal to a satellite-borne computer of a satellite cabin section A.
Specifically, the satellite cabin section B wireless microwave communication terminal synchronizes the local time of the satellite cabin section B wireless microwave communication terminal according to the received first time code information corresponding to the GPS/beidou second pulse signal, outputs a time pulse signal to the single machine of the satellite cabin section B through the OC door, and outputs second time code information corresponding to the time second pulse signal to the single machine of the satellite cabin section B through the asynchronous RS422 interface;
the single machine of the satellite cabin section B synchronizes local time according to the time second pulse signal and second time code information corresponding to the time second pulse signal;
and the satellite cabin B wireless microwave communication terminal outputs the time-second pulse signal and second time code information corresponding to the time-second pulse signal to the satellite-borne computer of the satellite cabin B.
Specifically, the satellite-borne computer of the satellite cabin section A and the satellite-borne computer of the satellite cabin section B respectively send time information broadcast to the single machine of the satellite cabin section A and the single machine of the satellite cabin section B through serial ports every other first preset time period;
the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B send time synchronization pulses to the single machine every second preset time period;
and broadcasting the time information and synchronizing the local time by the time pulse according to the time information of the stand-alone needing time synchronization in the satellite cabin section A and the stand-alone needing time synchronization in the satellite cabin section B.
According to the invention, the satellite comprises the inter-satellite-bay wireless time synchronization system.
The present invention will be described in more detail below by way of preferred examples.
Preferred example 1:
referring to fig. 5, in step 1, with the GPS/beidou second pulse signal in the satellite cabin section a as a reference, the second pulse signal is wirelessly transmitted to the wireless microwave communication terminal in the satellite cabin section B by using the wireless microwave communication terminal in the satellite cabin section a, so as to implement high-precision time synchronization between the two cabins.
And 2, outputting a second pulse timing time code signal interface by the GPS/Beidou receiver, outputting by an OC (open circuit) gate, enabling a low-level leading edge to be effective, enabling the leading edge time to be not more than 50ns, and enabling the pulse width to be 1ms +/-100 us, as shown in figure 6.
Step 3, as shown in fig. 7, the satellite cabin a wireless microwave communication terminal receives a GPS/beidou pulse per second signal from a GPS/beidou receiver through an OC gate, and simultaneously receives time code information corresponding to the pulse per second through an asynchronous RS422, and updates local absolute time of the terminal, where a time code data format is designed as shown in table 1, where data is effectively marked: AAAAH represents that the time code data is valid, 5555H represents that the time code data is invalid, and the cumulative second is the cumulative value from 1 month and 1 day zero hour in 2010 of Beijing, and the unit is s.
TABLE 1 Whole-second time code data Format
And step 4, as shown in fig. 8, the satellite cabin section a wireless microwave communication terminal sends the time code to the satellite cabin section B wireless microwave communication terminal through wireless communication. The time synchronization precision of 200ns can be kept between the two wireless microwave communication terminals according to the inter-cabin measurement algorithm, so that the local absolute time of the wireless microwave communication terminal of the satellite cabin section B can be consistent with that of the satellite cabin section A, the wireless microwave communication terminal of the satellite cabin section B outputs second pulses through an OC door, and time codes are output through an asynchronous RS422 for other single machines of the satellite cabin section B to use. Wherein the time code data format design is consistent with table 1.
And 5, sending time information broadcast to each single machine through the serial port every 0.5 second by the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B, and sending time synchronization pulse to the required single machine in every whole second time, so that the problem of high-precision time synchronization between the single machines in the two cabins is solved.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (3)
1. A method for wireless time synchronization between satellite cabins is characterized by comprising the following steps:
step A: the satellite cabin section A wireless microwave communication terminal receives a GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal, updates the local time of the satellite cabin section A wireless microwave communication terminal according to the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal, and sends the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal to the satellite cabin section A satellite-borne computer; wherein, the GPS/Beidou means: a GPS or Beidou satellite navigation system; taking a GPS/Beidou second pulse signal in the satellite cabin section A as a reference, and transmitting the second pulse signal to a satellite cabin section B wireless microwave communication terminal in a wireless manner by using the satellite cabin section A wireless microwave communication terminal; the GPS/Beidou receiver outputs a channel of second pulse timing time code signal interface, the OC gate outputs and the low level front edge is effective; the satellite cabin section A wireless microwave communication terminal receives GPS/Beidou second pulse signals from a GPS/Beidou receiver through an OC door, and meanwhile receives time code information corresponding to the second pulse through an asynchronous RS422, and local absolute time of the satellite cabin section A wireless microwave communication terminal is updated;
and B: the satellite cabin section A wireless microwave communication terminal sends first time code information corresponding to the GPS/Beidou second pulse signal to the satellite cabin section B wireless microwave communication terminal in a wireless communication mode;
and C: the satellite cabin section B wireless microwave communication terminal synchronizes the local time of the satellite cabin section B wireless microwave communication terminal according to the first time code information corresponding to the GPS/Beidou second pulse signal, and sends a time pulse signal and second time code information corresponding to the time second pulse signal to the satellite cabin section B satellite-borne computer;
step D: the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B respectively synchronize the time of a single machine in the satellite cabin section A and the time of a single machine in the satellite cabin section B at a preset frequency, the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B send time information broadcast to the single machines through serial ports every 0.5 second, and send time-setting pulses to the required single machines in every whole second, so that the problem of high-precision time synchronization between the single machines in the two cabins is solved;
the step A comprises the following steps:
step A1: the GPS/Beidou receiver of the satellite cabin section A outputs a GPS/Beidou second pulse signal to the wireless microwave communication terminal of the satellite cabin section A through an OC door, and outputs first time code information corresponding to the GPS/Beidou second pulse to the wireless microwave communication terminal of the satellite cabin section A through an asynchronous RS422 interface;
step A2: the satellite cabin section A wireless microwave communication terminal receives the GPS/Beidou second pulse signal through an OC door and receives first time code information corresponding to the GPS/Beidou second pulse through an asynchronous RS422 interface; wherein the low level leading edge of the GPS/Beidou second pulse signal is valid;
step A3: the satellite cabin section A wireless microwave communication terminal updates the local time of the satellite cabin section A wireless microwave communication terminal according to the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse;
step A4: the satellite cabin section A wireless microwave communication terminal sends the GPS/Beidou second pulse signal and the first time code information to a satellite-borne computer of the satellite cabin section A;
the step C comprises the following steps:
step C1: the satellite cabin section B wireless microwave communication terminal synchronizes the local time of the satellite cabin section B wireless microwave communication terminal according to the received first time code information corresponding to the GPS/Beidou second pulse signal, the satellite cabin section B wireless microwave communication terminal outputs a time pulse signal to the single machine of the satellite cabin section B through an OC door, and outputs second time code information corresponding to the time second pulse signal to the single machine of the satellite cabin section B through an asynchronous RS422 interface;
step C2: the single machine of the satellite cabin section B synchronizes local time according to the time second pulse signal and second time code information corresponding to the time second pulse signal;
step C3: the satellite cabin B wireless microwave communication terminal outputs a time second pulse signal and second time code information corresponding to the time second pulse signal to the satellite-borne computer of the satellite cabin B;
the step D comprises the following steps:
step D1: the satellite-borne computer of the satellite cabin section A and the satellite-borne computer of the satellite cabin section B respectively send time information broadcast to the single machine of the satellite cabin section A and the single machine of the satellite cabin section B through serial ports every other preset time period;
step D2: the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B send time synchronization pulses to the single machine every second preset time period;
step D3: and broadcasting the time information and synchronizing the local time by the time pulse according to the time information of the stand-alone needing time synchronization in the satellite cabin section A and the stand-alone needing time synchronization in the satellite cabin section B.
2. A system for wireless time synchronization between satellite compartments, comprising:
GPS/Beidou receiver: outputting a GPS/Beidou second pulse signal to a satellite cabin section A wireless microwave communication terminal, and outputting first time code information corresponding to the GPS/Beidou second pulse to the satellite cabin section A wireless microwave communication terminal;
satellite cabin section A wireless microwave communication terminal: receiving the GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal, updating the local time of a satellite cabin section A wireless microwave communication terminal according to the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal, sending the GPS/Beidou second pulse signal and the first time code information corresponding to the GPS/Beidou second pulse signal to a satellite cabin section A satellite-borne computer, and sending the first time code information corresponding to the GPS/Beidou second pulse signal to a satellite cabin section B wireless microwave communication terminal;
satellite cabin B wireless microwave communication terminal: synchronizing the local time of the wireless microwave communication terminal of the satellite cabin section B according to the first time code information corresponding to the GPS/Beidou second pulse signal, and sending a time pulse signal and second time code information corresponding to the time second pulse signal to the satellite-borne computer of the satellite cabin section B;
satellite cabin section A satellite borne computer and satellite cabin section B satellite borne computer: the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B respectively synchronize the single-machine time in the satellite cabin section A and the single-machine time in the satellite cabin section B at a preset frequency;
the GPS/Beidou receiver outputs a GPS/Beidou second pulse signal to the satellite cabin section A wireless microwave communication terminal through an OC door, and outputs first time code information corresponding to the GPS/Beidou second pulse to the satellite cabin section A wireless microwave communication terminal through an asynchronous RS422 interface;
the satellite cabin section A wireless microwave communication terminal receives the GPS/Beidou second pulse signal through an OC door and receives first time code information corresponding to the GPS/Beidou second pulse through an asynchronous RS422 interface; wherein the low level leading edge of the GPS/Beidou second pulse signal is valid;
the satellite cabin section A wireless microwave communication terminal updates local time according to the GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal;
sending the GPS/Beidou second pulse signal and first time code information corresponding to the GPS/Beidou second pulse signal to a satellite-borne computer of a satellite cabin section A
The satellite cabin section B wireless microwave communication terminal synchronizes the local time of the satellite cabin section B wireless microwave communication terminal according to the received first time code information corresponding to the GPS/Beidou second pulse signal, outputs a time pulse signal to the single machine of the satellite cabin section B through an OC door, and outputs second time code information corresponding to the time second pulse signal to the single machine of the satellite cabin section B through an asynchronous RS422 interface;
the single machine of the satellite cabin section B synchronizes local time according to the time second pulse signal and second time code information corresponding to the time second pulse signal;
the satellite cabin B wireless microwave communication terminal outputs a time second pulse signal and second time code information corresponding to the time second pulse signal to the satellite-borne computer of the satellite cabin B;
the satellite-borne computer of the satellite cabin section A and the satellite-borne computer of the satellite cabin section B respectively send time information broadcast to the single machine of the satellite cabin section A and the single machine of the satellite cabin section B through serial ports every other first preset time period;
the satellite-borne computer in the satellite cabin section A and the satellite-borne computer in the satellite cabin section B send time synchronization pulses to the single machine every second preset time period;
and broadcasting the time information and synchronizing the local time by the time pulse according to the time information of the stand-alone needing time synchronization in the satellite cabin section A and the stand-alone needing time synchronization in the satellite cabin section B.
3. A satellite comprising the wireless time synchronization system between satellite compartments as claimed in claim 2.
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| CN113872717B (en) * | 2021-08-23 | 2024-05-14 | 北京空间飞行器总体设计部 | Automatic out-of-order monitoring and recovering method for spacecraft time synchronization communication system |
| CN114422065A (en) * | 2021-12-16 | 2022-04-29 | 中国空间技术研究院 | High-orbit remote sensing satellite on-satellite time synchronization system and method |
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