Simulation method and device for inter-satellite laser link distance

Abstract

The invention provides an inter-satellite laser link distance simulation method and device, and the method comprises the steps: generating baseband data according to a synchronization pulse signal of a distance simulation device; the back edge of the frame header of the data frame of the baseband data is aligned with the synchronous pulse signal; performing time delay processing on the synchronous pulse signal to obtain first delay time of the simulation equipment relative to a single PPS of the laser satellite; sending the baseband data based on the first delay time; converting the baseband data into an optical signal, determining a second delay time of the optical signal, and sending the optical signal based on the second delay time; when the simulation equipment receives the ranging identifier of the satellite signal and the laser satellite receives the ranging identifier of the optical signal, the simulation equipment and the laser satellite respectively sample code element phases of respective emission signals to obtain phase measurement time; the distance between the simulation device and the laser satellite is determined based on the respective phase measurement time, rough simulation and accurate simulation of the distance between the simulation device and the laser satellite are achieved, and the application range is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of inter-satellite laser ranging, and in particular to a method and device for simulating inter-satellite laser link distance. Background Art

[0002] At present, inter-satellite ranging technology can be mainly divided into ranging technology based on time measurement and ranging technology based on phase measurement. Whether it is based on time measurement or phase measurement, it is necessary to extract the ranging mark and measure the time interval.

[0003] As for the method of extracting the ranging mark, in the pulse laser time-based ranging technology, analog or digital threshold discrimination is generally used. The influence of amplitude dynamics and background noise is eliminated by constant ratio timing and dual threshold triggering. The threshold discrimination accuracy can also be improved by reducing the pulse width, reducing the pulse rise time, and increasing the pulse energy. In the continuous laser phase-based measurement technology, the direct data bit synchronization ranging technology uses the zero-crossing point of the NCO phase of the bit synchronization loop as the ranging mark moment. The continuous laser ranging technology based on phase measurement relies on the long-term stable tracking of the narrowband phase-locked loop to improve the ranging accuracy.

[0004] However, the above analog ranging technology for intersatellite link distance is difficult to meet the requirements of wide range and high accuracy at the same time. Summary of the invention

[0005] The present invention provides a method and device for simulating the distance of an inter-satellite laser link, which are used to solve the technical problem in the prior art that the inter-satellite distance cannot be simulated with high accuracy and wide range.

[0006] On the one hand, the present invention provides a method for simulating the distance of an intersatellite laser link, wherein the intersatellite laser link comprises a laser distance simulation device and a laser satellite, wherein the laser distance simulation device comprises a ranging coding module, a PPS delay module and an optical fiber delay device, and the simulation method comprises: According to the synchronization pulse signal of the laser distance simulation device, the distance measurement encoding module is controlled to generate baseband data; wherein the trailing edge of the data frame header of the baseband data is aligned with the synchronization pulse signal as a distance measurement mark; Performing time delay processing on the synchronization pulse signal based on the PPS time delay module to obtain a first delay time of the laser distance simulation device relative to a single PPS of the laser satellite; Sending the baseband data based on the first delay time; Converting the baseband data into an optical signal, determining a second delay time of the optical signal based on the optical fiber delay device, and sending the optical signal based on the second delay time; Controlling the laser satellite to send satellite signals; When the laser distance simulation device receives the ranging identifier of the satellite signal and the laser satellite receives the ranging identifier of the optical signal, the laser distance simulation device and the laser satellite respectively sample the symbol phase of their respective transmitted signals to obtain their respective phase measurement times; The distance between the laser distance simulation device and the laser satellite is determined based on the respective phase measurement times.

[0007] According to a method for simulating inter-satellite laser link distance provided by the present invention, the laser distance simulation device and the laser satellite respectively sample the symbol phase of their respective transmitted signals to obtain their respective phase measurement times, including: The laser distance simulation device and the laser satellite respectively sample the symbol phase of their respective transmitted signals to obtain the frame count, symbol count and symbol NCO of their respective symbol phases; Based on the frame count, symbol count and symbol NCO of the respective symbol phases, the respective phase measurement times are obtained.

[0008] According to a method for simulating inter-satellite laser link distance provided by the present invention, the distance between the laser distance simulation device and the laser satellite is determined based on the respective phase measurement times, comprising: Determining the satellite clock time difference of the laser range simulation device relative to the laser satellite; Determining a transmission delay and a reception delay of the laser distance simulation device and the laser satellite; A first equation for determining the distance based on the phase measurement time of the laser distance simulation device, the satellite clock time difference, the receiving delay and the transmitting delay of the laser satellite; Adding the first delay time and the phase measurement time of the laser satellite to obtain an added time result; A second equation for determining the distance based on the added time result, the satellite clock time difference, the receiving delay of the laser satellite and the transmitting delay of the laser distance simulation device; The distance is determined based on the first equation and the second equation.

[0009] According to a simulation method of an inter-satellite laser link distance provided by the present invention, a first equation for determining the distance is based on the phase measurement time of the laser distance simulation device, the satellite clock time difference, the receiving delay and the transmitting delay of the laser satellite, including: T1=Δt+ +R+ ,in, T1 represents the phase measurement time of the laser distance simulation device, Δt represents the satellite clock time difference, Indicates the receiving delay of the laser distance simulation device, represents the launch delay of the laser satellite, and R represents the distance; The second equation for determining the distance based on the added time result, the satellite clock time difference, the receiving delay of the laser satellite and the transmitting delay of the laser distance simulation device includes: T2= +R+ -Δt, where T2 represents the addition time result, represents the emission delay of the laser distance simulation device, Represents the receiving delay of the laser satellite.

[0010] According to a simulation method of an inter-satellite laser link distance provided by the present invention, the distance is determined based on the first equation and the second equation, including: .

[0011] According to a simulation method of an inter-satellite laser link distance provided by the present invention, based on the frame count, symbol count and symbol NCO of each symbol phase, the respective phase measurement time is obtained, including: , where T represents the phase measurement time, The NCO control word represents the symbol transmission rate of the symbol phase, and the NCO control word represents the control word of the symbol phase.

[0012] According to a method for simulating inter-satellite laser link distance provided by the present invention, the ranging coding module is controlled to generate baseband data according to a synchronous pulse signal of the laser distance simulation device, including: Generate a working clock based on a reference clock of the laser distance simulation device; Based on the working clock and in accordance with the synchronous pulse signal of the laser distance simulation device, the distance measurement encoding module is controlled to generate baseband data.

[0013] According to a method for simulating inter-satellite laser link distance provided by the present invention, before sending the optical signal based on the second delay time, the method further includes: The optical signal is converted into a spatial optical signal.

[0014] According to a simulation method for intersatellite laser link distance provided by the present invention, the adjustment range of the PPS delay module is -0.5 seconds to 0.5 seconds, and the adjustment accuracy is 10 nanoseconds; The adjustment range of the optical fiber delay device is 0 seconds to 250 nanoseconds, and the adjustment accuracy is 1 picosecond.

[0015] On the other hand, the present invention also provides a simulation device for inter-satellite laser link distance, comprising: A baseband data generation module, used to control the distance measurement encoding module to generate baseband data according to the synchronization pulse signal of the laser distance simulation device; wherein the trailing edge of the data frame header of the baseband data is aligned with the synchronization pulse signal as a distance measurement mark; A first delay determination module is used to perform delay processing on the synchronization pulse signal based on the PPS delay module to obtain a first delay time of the laser distance simulation device relative to a single PPS of the laser satellite; A first sending module, configured to send the baseband data based on the first delay time; a second delay determination module, configured to convert the baseband data into an optical signal, determine a second delay time of the optical signal based on the optical fiber delay device, and send the optical signal based on the second delay time; A second sending module, used for controlling the laser satellite to send satellite signals; A phase measurement time determination module, configured to, when the laser distance simulation device receives the ranging identifier of the satellite signal and the laser satellite receives the ranging identifier of the optical signal, sample the symbol phases of their respective transmitted signals respectively and obtain their respective phase measurement times; A distance determination module is used to determine the distance between the laser distance simulation device and the laser satellite based on the respective phase measurement times.

[0016] On the other hand, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements any of the above-mentioned methods for simulating the distance of an inter-satellite laser link.

[0017] The simulation method and device of the intersatellite laser link distance provided by the present invention generate baseband data according to the synchronous pulse signal of the laser distance simulation device; perform time delay processing on the synchronous pulse signal to obtain the first delay time of the laser distance simulation device relative to the single PPS of the laser satellite; send the baseband data based on the first delay time; convert the baseband data into an optical signal, determine the second delay time of the optical signal, and send the optical signal based on the second delay time; control the laser satellite to send the satellite signal; when the distance simulation device receives the ranging identifier of the satellite signal and the laser satellite receives the ranging identifier of the optical signal, the laser distance simulation device and the laser satellite respectively sample the code element phase of their respective transmitted signals to obtain their respective phase measurement times; determine the distance between the simulation device and the laser satellite based on their respective phase measurement times. This embodiment realizes the coarse simulation and precise simulation of the intersatellite laser link distance between the laser distance simulation device and the laser satellite, can simulate the intersatellite laser link distance under the conditions of a large range and high precision, and has the advantages of wide application range and high simulation precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic flow chart of a method for simulating inter-satellite laser link distance provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the principle of determining distance based on the phase measurement time of the laser distance simulation device and the laser satellite provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of a simulation device for inter-satellite laser link distance provided by an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Figure 1It is a flow chart of the simulation method of the intersatellite laser link distance provided by an embodiment of the present invention. The intersatellite laser link may include a laser distance simulation device and a laser satellite, and the laser distance simulation device may include a ranging coding module, a pulse per second (PPS) delay module and an optical fiber delay device. The transmitting end of the laser distance simulation device may use an MZM (Mach-Zehnder Modulator) modulator and automatic bias control to realize phase (Binary Phase Shift Keying, BPSK) laser modulation.

[0022] See also Figure 1 The method for simulating the inter-satellite laser link distance may include the following steps 101 to 107.

[0023] 101. According to the synchronization pulse signal of the laser distance simulation device, control the distance measurement encoding module to generate baseband data; wherein the trailing edge of the data frame header of the baseband data is aligned with the synchronization pulse signal as a distance measurement mark.

[0024] In this step, the trailing edge of the baseband data frame header is aligned with the synchronization pulse signal to ensure that the baseband data frame header is accurately aligned with the synchronization pulse, thereby improving the ranging accuracy and reducing the time error in the signal transmission process through precise time alignment.

[0025] The demodulated timing information can be inserted into the data frame as the input for distance calculation, which means that during the data transmission process, the demodulated timing information is embedded into the data frame, and the timing information is then used to calculate the distance.

[0026] 102. Perform delay processing on the synchronization pulse signal based on the PPS delay module to obtain a first delay time of a single PPS of the laser distance simulation device relative to the laser satellite.

[0027] In this step, the synchronization pulse signal is delayed based on the PPS delay module to obtain the first delay time (that is, ΔPPS) of the laser distance simulation device relative to the single PPS of the laser satellite, which is equivalent to a large-scale rough simulation of the distance between the laser distance simulation device and the laser satellite. This rough simulation has the advantage of a large range and can be used to perform a large-scale distance simulation, that is, to make the simulated distance have a large adjustment range. By adjusting the size of the first delay time, the size of the simulated distance can be changed over a large range. The adjustment range of the PPS delay module can be -0.5 seconds to 0.5 seconds, and the adjustment accuracy can be 10 nanoseconds.

[0028] Furthermore, by performing delay processing on the synchronization pulse signal based on the PPS delay module, the accuracy of the obtained first delay time can be ensured.

[0029] 103. Send baseband data based on the first delay time.

[0030] 104. Convert the baseband data into an optical signal, determine a second delay time of the optical signal based on a fiber delay device, and send the optical signal based on the second delay time.

[0031] In this step, the baseband data is converted into an optical signal, and the second delay time of the optical signal is determined based on the optical fiber delay device, which is equivalent to a small-scale accurate simulation of the distance between the laser distance simulation device and the laser satellite. The accuracy of the accurate simulation is higher than the above-mentioned rough simulation. The size of the simulated distance can be changed in a small range by adjusting the size of the second delay time. The adjustment range of the optical fiber delay device can be 0 seconds to 250 nanoseconds, and the adjustment accuracy can be 1 picosecond.

[0032] 105. Control the laser satellite to send satellite signals.

[0033] In this step, it can be understood that the execution order of this step is not strictly limited to other steps, and this step can be executed simultaneously with the previous steps. This step can also be executed after the laser satellite receives the optical signal. The laser satellite can also be regarded as a laser terminal, and the satellite signal sent is the ranging frame. The laser satellite sends the ranging frame at the whole second under the pps drive without delay.

[0034] 106. When the laser distance simulation device receives the ranging identifier of the satellite signal and the laser satellite receives the ranging identifier of the optical signal, the laser distance simulation device and the laser satellite respectively sample the code element phase of their respective transmitted signals to obtain their respective phase measurement times.

[0035] In this step, the laser distance simulation device and the laser satellite respectively sample the symbol phase of their respective transmitted signals to obtain their respective phase measurement times, which may include: The laser distance simulation device and the laser satellite respectively sample the symbol phase of their respective transmitted signals to obtain the frame count, symbol count and symbol NCO of their respective symbol phases; Based on the frame count, symbol count and symbol NCO of the respective symbol phases, the respective phase measurement times are obtained.

[0036] Based on the frame count, symbol count and symbol NCO of each symbol phase, the respective phase measurement time is obtained, which may include the following formula (1).

[0037] Formula (1).

[0038] Where T is the phase measurement time, The NCO control word represents the symbol transmission rate of the symbol phase, and the NCO control word represents the control word of the symbol phase.

[0039] That is to say, after the laser satellite receives the optical signal, it generates a working clock based on the frequency doubling of the satellite clock signal to perform a series of processing on the synchronized optical signal, including sampling, code synchronization, and frame synchronization. The code element phase generated by the code synchronization provides the frame header trailing edge (ranging mark) of the demodulated data, and compares it in the NCO time stamp module to complete high-precision timing and record the frame number, code element, and NCO phase information sent by the laser terminal at this time.

[0040] 107. Determine the distance between the laser range simulation device and the laser satellite based on the respective phase measurement times.

[0041] In this embodiment, baseband data is generated according to the synchronization pulse signal of the laser distance simulation device; the synchronization pulse signal is delayed to obtain the first delay time of the laser distance simulation device relative to the single PPS of the laser satellite; the baseband data is sent based on the first delay time; the baseband data is converted into an optical signal, the second delay time of the optical signal is determined, and the optical signal is sent based on the second delay time; the laser satellite is controlled to send the satellite signal; when the distance simulation device receives the ranging identifier of the satellite signal and the laser satellite receives the ranging identifier of the optical signal, the laser distance simulation device and the laser satellite respectively sample the code element phase of their respective transmitted signals to obtain their respective phase measurement times; the distance between the simulation device and the laser satellite is determined based on their respective phase measurement times. This embodiment realizes the coarse simulation and precise simulation of the intersatellite laser link distance between the laser distance simulation device and the laser satellite, and can simulate the intersatellite laser link distance under the conditions of a large range and high precision, and has the advantages of wide application range and high simulation precision.

[0042] In one embodiment of the present specification, determining the distance between the laser distance simulation device and the laser satellite based on the respective phase measurement times may include: Determining the satellite clock time difference of the laser range simulation device relative to the laser satellite; Determining a transmission delay and a reception delay of the laser distance simulation device and the laser satellite; A first equation for determining the distance based on the phase measurement time of the laser distance simulation device, the satellite clock time difference, the receiving delay and the transmitting delay of the laser satellite; Adding the first delay time and the phase measurement time of the laser satellite to obtain an added time result; A second equation for determining the distance based on the added time result, the satellite clock time difference, the receiving delay of the laser satellite and the transmitting delay of the laser distance simulation device; The distance is determined based on the first equation and the second equation.

[0043] In this embodiment, the star clock time difference of the laser distance simulation device relative to the laser satellite is determined, the transmission delay and reception delay of the laser distance simulation device and the laser satellite are determined, the first equation for the distance is determined based on the phase measurement time of the laser distance simulation device, the star clock time difference, the reception delay and the transmission delay of the laser satellite, and the second equation for the distance is determined based on the addition time result, the star clock time difference, the reception delay of the laser satellite and the transmission delay of the laser distance simulation device. The distance between the laser distance simulation device and the laser satellite can be determined very accurately.

[0044] In one embodiment of this specification, see Figure 2 , Figure 2 The first equation for determining the distance based on the phase measurement time of the laser distance simulation device and the laser satellite provided by an embodiment of the present invention may include the following formula (2): T1=Δt+ +R+ , formula (2).

[0045] Wherein, T1 represents the phase measurement time of the laser distance simulation device, Δt represents the satellite clock time difference, Indicates the receiving delay of the laser distance simulation device, represents the launch delay of the laser satellite, and R represents the distance; The second equation for determining the distance based on the added time result, the satellite clock time difference, the receiving delay of the laser satellite and the transmitting delay of the laser distance simulation device may include the following formula (3): T2= +R+ -Δt, formula (3).

[0046] Wherein, T2 represents the addition time result, represents the emission delay of the laser distance simulation device, Represents the receiving delay of the laser satellite.

[0047] In this embodiment, the first equation and the second equation can accurately represent the distance between the laser distance simulation device and the laser satellite. The first delay time (ΔPPS) and the phase measurement time (T2') of the laser satellite are added to obtain the added time result T2.

[0048] In an embodiment of the present specification, determining the distance based on the first equation and the second equation may include the following formula (4): Formula (4).

[0049] In this embodiment, distance simulation is performed using various data such as the phase measurement time of the laser distance simulation device, the addition time result (the sum of the first delay time and the phase measurement time of the laser satellite), the emission delay of the laser distance simulation device, the reception delay of the laser distance simulation device, the emission delay of the laser satellite, and the reception delay of the laser satellite to obtain a simulated distance. A large range of distance simulation can be performed by adjusting the first delay time, and a small range of precise simulation can also be performed by adjusting the second delay time. It has the capabilities of coarse adjustment over a large range and precise adjustment over a small range, and has wide applicability and high accuracy.

[0050] In an embodiment of the present specification, controlling the distance measurement encoding module to generate baseband data according to the synchronization pulse signal of the laser distance simulation device may include: Generate a working clock based on a reference clock of the laser distance simulation device; Based on the working clock and in accordance with the synchronous pulse signal of the laser distance simulation device, the distance measurement encoding module is controlled to generate baseband data.

[0051] In this embodiment, the baseband data generated by the ranging coding module is ensured to be highly consistent with the actual distance through accurate synchronization of the reference clock and the working clock, thereby ensuring the accuracy of the ranging identification.

[0052] In an embodiment of the present specification, before sending the optical signal based on the second delay time, the method may further include: The optical signal is converted into a spatial optical signal.

[0053] In this embodiment, the optical signal is converted into a spatial optical signal to improve communication efficiency. It can be understood that after the optical signal is converted into a spatial optical signal, the spatial optical signal is sent based on the second delay time. When the laser satellite receives the spatial optical signal, the photoelectric conversion of the spatial optical signal is completed. The measurement identifier is the falling edge of the last bit of the frame synchronization of the data frame.

[0054] In summary, the present invention is to insert measurement information into the transmitted data frame to achieve ranging by laser ranging. Data frame ranging is to use the falling edge of the last bit of the frame synchronization of the data frame as the ranging mark, and the pulse is aligned with the satellite clock full second time (1PPS). When the ranging mark of the other satellite is received, the phase of the NCO (Numerically Controlled Oscillator) encoded by the satellite transmitting module is sampled, and the phase value is the associated distance information. Inter-satellite link distance simulation is mainly completed by accurately delaying the sending and receiving signals.

[0055] Based on the same general inventive concept, the present invention also protects a simulation device for intersatellite laser link distance, such as Figure 3 As shown, Figure 3 1 is a schematic diagram of the structure of the inter-satellite laser link distance simulation device provided by an embodiment of the present invention. The inter-satellite laser link distance simulation device provided by the present invention is described below. The inter-satellite laser link distance simulation device described below and the inter-satellite laser link distance simulation method described above can be referred to each other. The simulation device may include a baseband data generation module 201, a first delay determination module 202, a first sending module 203, a second delay determination module 204, a second sending module 205, a phase measurement time determination module 206 and a distance determination module 207.

[0056] The baseband data generation module 201 is used to control the distance measurement encoding module to generate baseband data according to the synchronization pulse signal of the laser distance simulation device; wherein the trailing edge of the data frame header of the baseband data is aligned with the synchronization pulse signal as a distance measurement mark; The first delay determination module 202 is used to perform delay processing on the synchronization pulse signal based on the PPS delay module to obtain a first delay time of the laser distance simulation device relative to a single PPS of the laser satellite; The first sending module 203 is used to send the baseband data based on the first delay time; The second delay determination module 204 is used to convert the baseband data into an optical signal, determine a second delay time of the optical signal based on the optical fiber delay device, and send the optical signal based on the second delay time; The second sending module 205 is used to control the laser satellite to send satellite signals; The phase measurement time determination module 206 is used for, when the laser distance simulation device receives the ranging identifier of the satellite signal and the laser satellite receives the ranging identifier of the optical signal, the laser distance simulation device and the laser satellite respectively sample the symbol phase of their respective transmitted signals to obtain their respective phase measurement times; The distance determination module 207 is used to determine the distance between the laser distance simulation device and the laser satellite based on the respective phase measurement times.

[0057] Figure 4 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.

[0058] like Figure 4As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630 and a communication bus 640, wherein the processor 610, the communication interface 620 and the memory 630 communicate with each other through the communication bus 640. The processor 610 may call the logic instructions in the memory 630 to execute the control method for preventing the ash conveying system of the thermal power plant from being blocked.

[0059] In addition, the logic instructions in the above-mentioned memory 630 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0060] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the simulation method of the inter-satellite laser link distance provided by the above methods.

[0061] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the simulation method of the inter-satellite laser link distance provided by the above methods.

[0062] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0063] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for simulating the distance of an intersatellite laser link, characterized in that: The intersatellite laser link comprises a laser distance simulation device and a laser satellite, the laser distance simulation device comprises a ranging coding module, a PPS delay module and an optical fiber delay device, and the simulation method comprises: According to the synchronization pulse signal of the laser distance simulation device, the distance measurement encoding module is controlled to generate baseband data; wherein the trailing edge of the data frame header of the baseband data is aligned with the synchronization pulse signal as a distance measurement mark; Performing time delay processing on the synchronization pulse signal based on the PPS time delay module to obtain a first delay time of the laser distance simulation device relative to a single PPS of the laser satellite; Sending the baseband data based on the first delay time; Converting the baseband data into an optical signal, determining a second delay time of the optical signal based on the optical fiber delay device, and sending the optical signal based on the second delay time; Controlling the laser satellite to send satellite signals; When the laser distance simulation device receives the ranging identifier of the satellite signal and the laser satellite receives the ranging identifier of the optical signal, the laser distance simulation device and the laser satellite respectively sample the symbol phase of their respective transmitted signals to obtain their respective phase measurement times; The distance between the laser distance simulation device and the laser satellite is determined based on the respective phase measurement times.

2. The method for simulating the distance of an intersatellite laser link according to claim 1, characterized in that: The laser distance simulation device and the laser satellite respectively sample the symbol phase of their respective transmitted signals to obtain their respective phase measurement times, including: The laser distance simulation device and the laser satellite respectively sample the symbol phase of their respective transmitted signals to obtain the frame count, symbol count and symbol NCO of their respective symbol phases; Based on the frame count, symbol count and symbol NCO of the respective symbol phases, the respective phase measurement times are obtained.

3. The method for simulating the distance of an intersatellite laser link according to claim 1, characterized in that: Determining the distance between the laser distance simulation device and the laser satellite based on the respective phase measurement times comprises: Determining the satellite clock time difference of the laser range simulation device relative to the laser satellite; Determining a transmission delay and a reception delay of the laser distance simulation device and the laser satellite; A first equation for determining the distance based on the phase measurement time of the laser distance simulation device, the satellite clock time difference, the receiving delay and the transmitting delay of the laser satellite; Adding the first delay time and the phase measurement time of the laser satellite to obtain an added time result; A second equation for determining the distance based on the added time result, the satellite clock time difference, the receiving delay of the laser satellite and the transmitting delay of the laser distance simulation device; The distance is determined based on the first equation and the second equation.

4. The method for simulating the distance of an intersatellite laser link according to claim 3, characterized in that: The first equation for determining the distance based on the phase measurement time of the laser distance simulation device, the satellite clock time difference, the receiving delay and the transmitting delay of the laser satellite includes: T1=Δt+ +R+ ,in, T1 represents the phase measurement time of the laser distance simulation device, Δt represents the satellite clock time difference, Indicates the receiving delay of the laser distance simulation device, represents the launch delay of the laser satellite, and R represents the distance; The second equation for determining the distance based on the added time result, the satellite clock time difference, the receiving delay of the laser satellite and the transmitting delay of the laser distance simulation device includes: T2= +R+ -Δt, where T2 represents the addition time result, represents the emission delay of the laser distance simulation device, Represents the receiving delay of the laser satellite.

5. The method for simulating the distance of an intersatellite laser link according to claim 4, characterized in that: Determining the distance based on the first equation and the second equation includes: 。 6. The method for simulating the distance of an intersatellite laser link according to claim 2, characterized in that: Based on the frame count, symbol count and symbol NCO of each symbol phase, the respective phase measurement time is obtained, including: , where T represents the phase measurement time, The NCO control word represents the symbol transmission rate of the symbol phase, and the NCO control word represents the control word of the symbol phase.

7. The method for simulating intersatellite laser link distance according to claim 1, characterized in that: According to the synchronization pulse signal of the laser distance simulation device, the distance measurement encoding module is controlled to generate baseband data, including: Generate a working clock based on a reference clock of the laser distance simulation device; Based on the working clock and in accordance with the synchronous pulse signal of the laser distance simulation device, the distance measurement encoding module is controlled to generate baseband data.

8. The method for simulating intersatellite laser link distance according to claim 1, characterized in that: Before sending the optical signal based on the second delay time, the method further includes: The optical signal is converted into a spatial optical signal.

9. The method for simulating intersatellite laser link distance according to claim 1, characterized in that: The adjustment range of the PPS delay module is -0.5 seconds to 0.5 seconds, and the adjustment accuracy is 10 nanoseconds; The adjustment range of the optical fiber delay device is 0 seconds to 250 nanoseconds, and the adjustment accuracy is 1 picosecond.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for simulating the inter-satellite laser link distance as described in any one of claims 1 to 9 is implemented.

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