A laser communication speed measurement method, device, equipment, storage medium and system

Abstract

This invention provides a laser communication speed measurement method, apparatus, device, storage medium, and system, comprising: acquiring a local time reference signal; emitting a synchronization signal synchronized with the frequency of the second device based on the received optical signal emitted by the second device; and calculating the relative speed between the device and the second device based on the local time reference signal and the synchronization signal. By receiving the optical signal from the second device and actively emitting a synchronization signal synchronized with the frequency of the second device, and by using the synchronization signal emitted by the device to achieve time-frequency synchronization with the local time reference signal and the same frequency, the relative speed between the two can be calculated. Ultimately, this allows the device to quickly obtain the speed of the second device. The overall speed measurement method is simple, fast, and easy to implement, while effectively reducing the platform resources required, and has significant application prospects.

Description

Technical Field

[0001] This invention relates to the field of laser communication, and more particularly to a laser communication speed measurement method, apparatus, device, and readable storage medium. Background Technology

[0002] With the development of communication technology, domestic and international satellite communication systems have entered the experimental verification stage and the commercial operation stage. For satellites used in applications such as remote sensing and telemetry, forming a long baseline measurement system through satellite constellation networking is of great significance for high-precision remote sensing and telemetry. In this application scenario, it is necessary to establish high-speed data links between satellites, as well as frequency and time synchronization between satellites, while also requiring precise ranging and precise velocity measurement to ensure the accuracy of the satellite constellation formation and lay the foundation for long baseline measurement systems.

[0003] In related technologies, the velocity measurement and time-frequency synchronization systems are independent of the communication systems, each using its own independent operating system. Therefore, both the satellite and the ground require nearly twice the platform resources, including payload mass, volume, and power consumption, which puts considerable pressure on the satellite platform. Summary of the Invention

[0004] The main objective of this invention is to provide a laser communication speed measurement method, device, equipment, and readable storage medium, aiming to solve the problems of high complexity in speed measurement and time-frequency synchronization during satellite laser communication, and excessively high cost of the entire communication, time-frequency, and speed measurement system.

[0005] In a first aspect, the present invention provides a laser communication speed measurement method.

[0006] A laser communication velocimetry method, comprising:

[0007] Obtain the local time base signal;

[0008] Based on the received optical signal from the second device, a synchronization signal synchronized with the frequency of the second device is emitted;

[0009] The relative speed with the second device is calculated based on the local time reference signal and the synchronization signal.

[0010] In some embodiments, calculating the relative speed with the second device based on the local time reference signal and the synchronization signal includes:

[0011] After a valid transition edge of the local time reference signal, the number of cycles of the synchronization signal is counted starting from zero, and at the next valid transition edge of the local time reference signal, the current count value is latched as the calculated value.

[0012] The relative speed with the second device is calculated based on the calculated value and the period value of the local time reference signal.

[0013] In some embodiments, the relative speed with the second device is calculated based on the calculated value and the period value of the local time reference signal, according to the formula:

[0014]

[0015] The magnitude v of the relative velocity vector is numerically solved, where n sync For the calculated value, T ref f is the period value of the local time base signal. rf_norm Here, c is the nominal frequency of the synchronization signal, θ is the speed of light, θ is the angle between the relative velocity vector and the line connecting the first and second devices, and v is the magnitude of the relative velocity vector.

[0016] In some embodiments, the step of emitting a synchronization signal synchronized with the frequency of the second device based on the received optical signal emitted by the second device includes:

[0017] Based on the received optical signal from the second device, an analog signal is emitted;

[0018] Based on the analog signal, output a synchronization frequency signal;

[0019] The synchronization frequency signal is transformed into the synchronization signal used for cycle counting.

[0020] In some embodiments, acquiring the local time reference signal includes:

[0021] Employ a local frequency reference signal;

[0022] A local time reference signal is generated using the local frequency reference signal as the clock.

[0023] Secondly, the present invention also provides a laser communication speed measurement device.

[0024] A laser communication velocimetry device, the laser communication velocimetry device comprising:

[0025] A time baseband circuit, which is configured to acquire a local time reference signal;

[0026] The CDR circuit is configured to emit a synchronization signal that is synchronized with the frequency of the second device based on the optical signal received from the second device.

[0027] The speed calculation module is configured to calculate the relative speed with the second device based on the local time reference signal and the synchronization signal.

[0028] In some embodiments, it also includes:

[0029] The counter is configured to count the number of cycles of the synchronization signal starting from zero after a valid transition edge of the local time base signal, and to latch the current count value as the calculated value at the next valid transition edge of the local time base signal.

[0030] Thirdly, the present invention also provides a laser communication speed measurement device.

[0031] A laser communication speed measurement device includes a processor, a memory, and a laser communication speed measurement program stored in the memory and executable by the processor, wherein when the laser communication speed measurement program is executed by the processor, it implements the steps of the laser communication speed measurement method as described above.

[0032] Fourthly, the present invention also provides a readable storage medium.

[0033] A readable storage medium, characterized in that the readable storage medium stores a laser communication speed measurement program, wherein when the laser communication speed measurement program is executed by a processor, it implements the steps of the laser communication speed measurement method described above.

[0034] Fifthly, the present invention also provides a laser communication speed measurement system.

[0035] A laser communication velocimetry system includes at least a first device and a second device, both of which are used for:

[0036] Transmit a local frequency reference signal; based on the local frequency reference signal, transmit a local time reference signal;

[0037] Based on the received optical signal from the second device, a synchronization signal synchronized with the frequency of the second device is emitted;

[0038] The relative speed with the second device is calculated based on the local time reference signal and the synchronization signal.

[0039] This invention receives an optical signal from a second device and then actively emits a synchronization signal that is synchronized with the frequency of the second device. Since the synchronization signal emitted by the device can be used to achieve time-frequency synchronization with a synchronization signal of the same frequency and a local time reference signal, the relative speed between the two can be calculated. In the end, the device can quickly obtain the speed of the second device. The overall speed measurement method is simple, fast and easy to implement, and effectively reduces the platform resources required, which has great application prospects. Attached Figure Description

[0040] Figure 1This is a schematic diagram of the hardware structure of the laser communication velocimetry device involved in the embodiments of the present invention;

[0041] Figure 2 This is a flowchart illustrating the first embodiment of the laser communication velocimetry method of the present invention;

[0042] Figure 3 This is a functional module diagram of the first embodiment of the laser communication velocimetry device of the present invention;

[0043] Figure 4 This is a flowchart illustrating the functional modules of the laser communication velocimetry device of the present invention.

[0044] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0046] With the development of communication technology, domestic and international satellite communication systems have entered the experimental verification stage and the commercial operation stage. For satellites used in applications such as remote sensing and telemetry, forming a long baseline measurement system through satellite constellation networking is of great significance for high-precision remote sensing and telemetry. In this application scenario, it is necessary to establish high-speed data links between satellites, as well as frequency and time synchronization between satellites, while also requiring precise ranging and precise velocity measurement to ensure the accuracy of the satellite constellation formation and lay the foundation for the long baseline measurement system. In related technologies, the velocity measurement and time-frequency synchronization systems are independent of the communication system, each using an independent operating system. Therefore, both the satellite and the ground require nearly twice the platform resources, including payload mass, volume, and power consumption, which puts considerable pressure on the satellite platform.

[0047] To address the aforementioned problems, this invention provides a laser communication speed measurement method, apparatus, device, and system. The core of this invention is that after receiving the optical signal from a second device, the device actively emits a synchronization signal that is synchronized with the frequency of the second device. Since the synchronization signal emitted by the device can be used to achieve time-frequency synchronization with a synchronization signal of the same frequency and a local time reference signal, the relative speed between the two can be calculated. Ultimately, this allows the device to quickly obtain the speed of the second device. The overall speed measurement method is simple, fast, and easy to implement, while effectively reducing the platform resources required, and has great application prospects.

[0048] In a first aspect, embodiments of the present invention provide a laser communication speed measurement device, which can be a device with data processing capabilities such as a personal computer (PC), a laptop computer, or a server.

[0049] Reference Figure 1 , Figure 1 This is a schematic diagram of the hardware structure of the laser communication speed measurement device involved in the embodiment of the present invention. In this embodiment, the laser communication speed measurement device may include a processor 1001 (e.g., a Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to realize communication between these components; the user interface 1003 may include a display screen or an input unit such as a keyboard; the network interface 1004 may optionally include a standard wired interface or a wireless interface (e.g., Wireless Fidelity, Wi-Fi interface); the memory 1005 may be high-speed random access memory (RAM) or stable memory (non-volatile memory), such as a disk storage device. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001. Those skilled in the art will understand that… Figure 1 The hardware structure shown does not constitute a limitation of the invention and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0050] Continue to refer to Figure 1 , Figure 1 The memory 1005, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and a laser communication speed measurement program. The processor 1001 can call the laser communication speed measurement program stored in the memory 1005 and execute the laser communication speed measurement method provided in this embodiment of the invention.

[0051] Secondly, embodiments of the present invention provide a laser communication speed measurement method.

[0052] Reference Figure 2 A laser communication velocimetry method, comprising:

[0053] S100, Obtain the local time reference signal;

[0054] S200: Based on the received optical signal from the second device, send a synchronization signal that is synchronized with the frequency of the second device;

[0055] S300. Calculate the relative speed with the second device based on the local time reference signal and the synchronization signal.

[0056] This setup allows the device to receive the optical signal from the second device and then actively emit a synchronization signal that is synchronized with the frequency of the second device. Since the synchronization signal emitted by the device can be used with the synchronization signal of the same frequency and the local time reference signal to achieve time-frequency synchronization, the relative speed between the two can be calculated. Ultimately, this allows the device to quickly obtain the speed of the second device. The overall speed measurement method is simple, fast, and easy to implement, while effectively reducing the platform resources required, and has great application prospects.

[0057] Further, step S300, calculating the relative speed with the second device based on the local time reference signal and the synchronization signal, includes:

[0058] S310. After the effective transition edge of the local time reference signal, count the number of cycles of the synchronization signal starting from zero, and latch the current count value as the calculated value at the next effective transition edge of the local time reference signal.

[0059] S320. Calculate the relative speed with the second device based on the calculated value and the period value of the local time reference signal.

[0060] Further, the relative speed with the second device is calculated based on the calculated value and the period value of the local time reference signal, according to the formula:

[0061]

[0062] The magnitude v of the relative velocity vector is numerically solved, where n sync For the calculated value, T ref f is the period value of the local time base signal. rf_norm Here, c is the nominal frequency of the synchronization signal, θ is the speed of light, and θ is the angle between the relative velocity vector and the line connecting the first and second devices, which can be calculated from the orbital parameters and ephemeris of the first and second devices; v is the magnitude of the required relative velocity vector.

[0063] Further, step S200, which involves sending a synchronization signal synchronized with the frequency of the second device based on the received optical signal from the second device, includes:

[0064] S210. Based on the received optical signal from the second device, send an analog signal;

[0065] S220. Output a synchronization frequency signal based on the analog signal;

[0066] S230, The synchronization frequency signal is converted into the synchronization signal used for counting cycles.

[0067] The synchronization frequency signal generated in step S220 can be output and used by other related functional modules, so that other functional modules can successfully complete the same frequency operation with the second device, reducing the complexity of the overall device when operating at the same frequency with another device.

[0068] Further, step S100, acquiring the local time reference signal, includes:

[0069] S110, Employ the local frequency reference signal;

[0070] S120: Using the local frequency reference signal as a clock, generate a local time reference signal.

[0071] For details, see Figure 3 In this embodiment, the laser communication velocimetry method provided, when combined with the execution function module, specifically includes the following process:

[0072] F1. The local frequency reference generator produces the local frequency reference signal FREQ_REF;

[0073] F2. The local time base generator uses the local frequency reference signal FREQ_REF as its clock, generating a period of T. ref The local time base signal TIME_REF;

[0074] F3. Based on the optical signal received from the second device, the DAC is controlled by the digital demodulation module to output an analog signal;

[0075] F4. The voltage-controlled oscillator is controlled by the analog signal output by the DAC and outputs the synchronization frequency signal FREQ_SYNC.

[0076] F5. The frequency synthesizer converts the synchronization frequency signal FREQ_SYNC into an RF synchronization signal RF_SYNC (i.e., the synchronization signal), which is then sent to the RF counter for frequency measurement.

[0077] F6. The RF counter is reset to its count value n after the effective transition edge of the local time base signal TIME_REF. rf =0;

[0078] F7, the RF counter counts the period n of the synchronization RF signal RF_SYNC. rf =n rf +1;

[0079] F8, the RF counter latches the current count value n on the valid transition edge of the local time base signal TIME_REF. sync =n rf ;

[0080] F9. The speed measurement calculation module uses the following formula:

[0081]

[0082] The magnitude v of the relative velocity vector is solved numerically.

[0083] In the formula, n sync T is the count value of the RF counter. ref f is the period value of the local time base signal TIME_REF. rf_norm Here, c is the nominal frequency of the RF synchronization signal RF_SYNC, θ is the angle between the relative velocity vector and the line connecting the terminals, and these values ​​are either measured or known. v is the magnitude of the relative velocity vector, which is obtained through numerical methods.

[0084] Thirdly, embodiments of the present invention also provide a laser communication speed measurement device.

[0085] Reference Figure 4 A schematic diagram of the functional modules of the first embodiment of the laser communication velocimetry device.

[0086] The laser communication velocimetry device includes:

[0087] A time baseband circuit, which is configured to acquire a local time reference signal;

[0088] The CDR circuit is configured to emit a synchronization signal that is synchronized with the frequency of the second device based on the optical signal received from the second device.

[0089] The speed measurement and calculation module is configured to calculate the relative speed with the second device based on the local time reference signal and the synchronization signal;

[0090] Furthermore, the laser communication velocimetry device also includes:

[0091] Counting module (i.e.) Figure 3 The RF counter is configured to count the number of cycles of the synchronization signal starting from zero after a valid transition edge of the local time reference signal, and to latch the current count value as the calculated value at the next valid transition edge of the local time reference signal.

[0092] Specifically, the time baseband circuit includes a local frequency reference generator and a local time reference generator. The local frequency reference generator generates a local frequency reference signal, and the local time reference generator uses the local frequency reference signal as a clock to generate a local time reference signal.

[0093] The CDR circuit specifically includes a DAC, a voltage-controlled oscillator (VCO), and a frequency synthesizer. The DAC, controlled by the digital demodulation module, outputs an analog signal; the VCO, controlled by the DAC's analog output signal, outputs a synchronization frequency signal FREQ_SYNC; and the frequency synthesizer converts the FREQ_SYNC synchronization signal into an RF synchronization signal RF_SYNC, which is then sent to an RF counter for frequency measurement.

[0094] Fourthly, embodiments of the present invention also provide a readable storage medium.

[0095] The present invention stores a laser communication speed measurement program on a readable storage medium, wherein when the laser communication speed measurement program is executed by a processor, it implements the steps of the laser communication speed measurement method described above.

[0096] The method implemented when the laser communication speed measurement program is executed can be referred to in various embodiments of the laser communication speed measurement method of the present invention, and will not be repeated here.

[0097] Fifthly, embodiments of the present invention also provide a laser communication speed measurement system.

[0098] A laser communication velocimetry system includes at least a first device and a second device, both of which are used for:

[0099] Transmit a local frequency reference signal; based on the local frequency reference signal, transmit a local time reference signal;

[0100] Based on the received optical signal from the second device, a synchronization signal synchronized with the frequency of the second device is emitted;

[0101] The relative speed with the second device is calculated based on the local time reference signal and the synchronization signal.

[0102] It is understandable that, when needed, both the first and second devices in the laser communication velocimetry system can use the aforementioned laser communication velocimetry method to measure the relative speed between them and process the signals at the same frequency, based on the optical signal received from the other device.

[0103] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0104] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0105] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of the present invention.

[0106] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method of laser communication ranging, comprising: It includes: Obtain the local time base signal; Based on the optical signal received from the second device, a synchronization signal synchronized with the frequency of the second device is generated through a CDR circuit including a DAC, a voltage-controlled oscillator, and a frequency synthesizer. Calculate the relative speed with the second device based on the local time reference signal and the synchronization signal; The step of calculating the relative speed with the second device based on the local time reference signal and the synchronization signal includes: After a valid transition edge of the local time reference signal, the number of cycles of the synchronization signal is counted starting from zero, and at the next valid transition edge of the local time reference signal, the current count value is latched as the calculated value. Calculate the relative speed with the second device based on the calculated value and the period value of the local time reference signal; The relative speed with the second device is calculated based on the calculated value and the period value of the local time reference signal, according to the formula: ； Magnitude of the relative velocity vector Numerical solution is performed, where, The calculated value, The period value of the local time base signal. This is the nominal frequency value of the synchronization signal. At the speed of light, The angle between the line connecting the first and second devices and the relative velocity vector can be calculated using the orbital parameters and ephemeris of the first and second devices.

2. The laser communication velocimetry method as described in claim 1, characterized in that, The step of transmitting a synchronization signal synchronized with the frequency of the second device based on the received optical signal from the second device includes: Based on the received optical signal from the second device, an analog signal is emitted; Based on the analog signal, output a synchronization frequency signal; The synchronization frequency signal is transformed into the synchronization signal used for cycle counting.

3. The laser communication velocimetry method as described in claim 1, characterized in that, The acquisition of the local time reference signal includes: Employ a local frequency reference signal; A local time reference signal is generated using the local frequency reference signal as the clock.

4. A laser communication velocimetry device, characterized in that, The laser communication velocimetry device includes: A time baseband circuit, which is configured to acquire a local time reference signal; The CDR circuit is configured to emit a synchronization signal that is synchronized with the frequency of the second device based on the optical signal received from the second device. The speed measurement and calculation module is configured to calculate the relative speed with the second device based on the local time reference signal and the synchronization signal; The laser communication device also includes: The counting module is configured to, after a valid transition edge of the local time base signal... The number of cycles of the synchronization signal is counted starting from zero, and the current count value is latched as the calculated value at the next valid transition edge of the local time base signal. The speed measurement calculation module is configured to calculate based on the formula: ； Magnitude of the relative velocity vector Numerical solution is performed, where, The calculated value, The period value of the local time base signal. This is the nominal frequency value of the synchronization signal. At the speed of light, The angle between the line connecting the first and second devices and the relative velocity vector can be calculated using the orbital parameters and ephemeris of the first and second devices. The CDR circuit specifically includes a DAC, a voltage-controlled oscillator, and a frequency synthesizer.

5. The laser communication velocimetry device as described in claim 4, characterized in that, Also includes: The counter is configured to count the number of cycles of the synchronization signal starting from zero after a valid transition edge of the local time base signal, and to latch the current count value as the calculated value at the next valid transition edge of the local time base signal.

6. A laser communication velocimetry device, characterized in that, The laser communication speed measurement device includes a processor, a memory, and a laser communication speed measurement program stored in the memory and executable by the processor, wherein when the laser communication speed measurement program is executed by the processor, it implements the steps of the laser communication speed measurement method as described in any one of claims 1 to 3.

7. A readable storage medium, characterized in that, The readable storage medium stores a laser communication speed measurement program, wherein when the laser communication speed measurement program is executed by a processor, it implements the steps of the laser communication speed measurement method as described in any one of claims 1 to 3.

8. A laser communication velocimetry system, characterized in that, It includes at least a first device and a second device, both of which are used for: Transmit a local frequency reference signal; based on the local frequency reference signal, transmit a local time reference signal; Based on the optical signal received from the second device, a synchronization signal synchronized with the frequency of the second device is generated through a CDR circuit including a DAC, a voltage-controlled oscillator, and a frequency synthesizer. Calculate the relative speed with the second device based on the local time reference signal and the synchronization signal; The step of calculating the relative speed with the second device based on the local time reference signal and the synchronization signal includes: After a valid transition edge of the local time reference signal, the number of cycles of the synchronization signal is counted starting from zero, and at the next valid transition edge of the local time reference signal, the current count value is latched as the calculated value. Calculate the relative speed with the second device based on the calculated value and the period value of the local time reference signal; The relative speed with the second device is calculated based on the calculated value and the period value of the local time reference signal, according to the formula: ； Magnitude of the relative velocity vector Numerical solution is performed, where, The calculated value, The period value of the local time base signal. This is the nominal frequency value of the synchronization signal. At the speed of light, The angle between the relative velocity vector and the line connecting the first and second devices.

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