Optimization method and device for improving ranging precision of laser inter-satellite communication ranging link

Abstract

The application relates to the technical field of laser intersatellite link communication ranging, and provides an optimization method and device for improving the ranging precision of a laser intersatellite communication ranging link, which comprises the following steps: acquiring sampling data of a photoelectric detection signal of the laser intersatellite communication ranging link in real time; performing interpolation recovery on the sampling data according to current loop interpolation parameters; performing clock phase error phase discrimination on the interpolation recovery data, wherein the phase discrimination gain coefficient needs to be corrected through real-time amplitude monitoring of the interpolation recovery data; filtering the clock phase error phase discrimination result; updating the loop interpolation parameters and the super-resolution code phase accurate ranging result by using the filtered clock phase error phase discrimination result; and extracting the super-resolution code phase accurate ranging result. The application can correct the phase discrimination gain coefficient in real time through real-time monitoring of the amplitude change, so that the ranging precision does not change with the amplitude change of the received light signal, and the ranging precision under the dynamic amplitude change working condition of the laser intersatellite link is improved.

Description

Technical Field

[0001] This invention relates to the field of laser inter-satellite link communication ranging technology, and more specifically, to an optimized method and apparatus for improving the ranging accuracy of laser inter-satellite communication ranging links. Background Technology

[0002] Laser inter-satellite links have been applied in satellite constellation networking projects. They widely adopt an integrated communication and ranging system, achieving high-speed inter-satellite communication while using communication clock synchronization information to achieve high-precision ranging with super-symbol resolution. Laser inter-satellite links can achieve ranging accuracy in the millimeter range at communication rates in the Gbps range.

[0003] The integrated communication and ranging solution uses the header of the 0th frame of each second as the ranging identifier, simultaneously achieving high-speed communication and high-precision ranging without consuming link communication bandwidth. The ranging identifier is sent when aligned with the local second pulse reference, and timing begins locally at the exact second. Local demodulation of received communication frames is performed, and timing stops when the ranging frame identifier of the received communication frame is detected. The ranging time data relative to the start of timing at the exact second is extracted. Integer symbol ranging values ​​are obtained through frame counting and symbol counting of the received communication frames. Precise phase ranging values ​​are obtained by recovering the super-resolution symbol phase using a digital clock. The integer symbol and precise phase ranging results are combined to obtain a large-range super-resolution ranging result.

[0004] The ranging accuracy of current integrated communication ranging solutions is determined by the phase error resolution performance of the digital clock recovery loop. However, the existing digital clock recovery loop phase error resolution implementation scheme is affected by the amplitude of the received optical signal, and the ranging accuracy varies with the amplitude of the received optical signal, which cannot guarantee the ranging accuracy under the dynamic amplitude change condition of the laser inter-satellite link. Summary of the Invention

[0005] The present invention aims to provide an optimized method and apparatus for improving the ranging accuracy of laser inter-satellite communication ranging links, so as to meet the high-precision ranging requirements under dynamic amplitude variation conditions of laser inter-satellite links.

[0006] In a first aspect, the present invention provides an optimization method for improving the ranging accuracy of laser inter-satellite communication ranging links, comprising:

[0007] Real-time acquisition of sampling data of photoelectric detection signals from laser inter-satellite communication ranging links;

[0008] Digital clock recovery of sampled data:

[0009] The sampled data is reconstructed by interpolation based on the current loop interpolation parameters;

[0010] Clock phase error detection is performed on the interpolated data, which requires correction of the phase detection gain coefficient by real-time amplitude monitoring of the interpolated data;

[0011] Filter the clock phase error phase detection results;

[0012] The loop interpolation parameters and the super-resolution symbol phase accurate ranging results are updated using the filtered clock phase error phase detection results.

[0013] Extract the phase of the super-resolution symbol for accurate ranging.

[0014] In a preferred embodiment, the phase detection gain coefficient of the digital phase detection unit is corrected in real time by monitoring the change in the average amplitude of the interpolated recovery data.

[0015] In a preferred embodiment, the super-resolution symbol phase accurate ranging result is extracted based on the received ranging identifier trigger.

[0016] Secondly, the present invention provides an optimized device for improving the ranging accuracy of laser inter-satellite communication ranging links, including an analog-to-digital converter and a digital clock recovery loop;

[0017] The analog-to-digital converter is used to acquire sampling data of photoelectric detection signals from the laser inter-satellite communication ranging link in real time;

[0018] The digital clock recovery loop is used to recover the digital clock from the sampled data and extract the precise ranging results of the super-resolution symbol phase; the digital clock recovery loop includes:

[0019] The interpolation filter unit is used to interpolate and recover the sampled data based on the current loop interpolation parameters.

[0020] The digital phase detector unit is used to detect clock phase errors in the interpolated data.

[0021] The signal amplitude monitoring unit is used to correct the phase detection gain coefficient of the digital phase detection unit by real-time amplitude monitoring of the interpolated recovered data.

[0022] The digital loop filter unit is used to filter the clock phase error phase detection results;

[0023] The numerically controlled oscillator unit is used to update the loop interpolation parameters and the super-resolution symbol phase accurate ranging results using the filtered clock phase error phase detection results.

[0024] In a preferred embodiment, the signal amplitude monitoring unit is specifically used for:

[0025] By monitoring the average amplitude change of the interpolated data in real time, the real-time signal amplitude |A(t)| is obtained, and the phase detection gain coefficient Kd=1 / |A(t)| of the digital phase detection unit is corrected in real time.

[0026] In a preferred embodiment, the digital clock recovery loop is specifically used for:

[0027] Based on the ranging identifier obtained by communication demodulation of the received signal, the super-resolution symbol phase is extracted to obtain the accurate ranging result.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] This invention monitors the changes in the amplitude of the received signal in real time during the communication ranging process and corrects the phase error phase detection gain coefficient of the digital clock recovery loop in real time. This ensures that the ranging accuracy does not change with the amplitude of the received optical signal, improves the ranging accuracy under dynamic amplitude variation conditions of laser inter-satellite links, adapts to dynamic distance and power variations of laser inter-satellite links, and meets the application requirements of high-precision ranging of laser inter-satellite links. Attached Figure Description

[0030] Figure 1 This is a flowchart of an optimization method for improving the ranging accuracy of laser inter-satellite communication ranging links, provided as an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of an optimization device for improving the ranging accuracy of laser inter-satellite communication ranging links, provided in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] Example

[0035] like Figure 1As shown, this embodiment of the invention provides an optimization method for improving the ranging accuracy of laser inter-satellite communication ranging links. The method optimizes the design of the digital clock recovery loop, which determines the ranging accuracy of the integrated communication ranging scheme. Specifically, it includes the following steps:

[0036] S100 acquires real-time sampling data of photoelectric detection signals from the laser inter-satellite communication ranging link; specifically, it can acquire the sampling data of photoelectric detection signals from the laser inter-satellite communication ranging link through high-speed analog-to-digital conversion.

[0037] S200, performs digital clock recovery on the sampled data:

[0038] S201, perform interpolation recovery on the sampled data according to the current loop interpolation parameters; the loop interpolation parameters refer to the loop interpolation interval.

[0039] S202, clock phase error detection is performed on the interpolated data. This requires real-time amplitude monitoring of the interpolated data to correct the phase detection gain coefficient and eliminate the influence of signal amplitude changes on the clock phase detection result. In this embodiment of the invention, the real-time signal amplitude |A(t)| is obtained by real-time monitoring of the average amplitude change of the interpolated data, and the phase detection gain coefficient Kd=1 / |A(t)| of the digital phase detection unit is corrected in real time.

[0040] S203 filters the clock phase error phase detection results to reduce phase noise.

[0041] S204 uses the filtered clock phase error phase detection result to update the loop interpolation parameters and the super-resolution symbol phase accurate ranging result to complete the loop closure.

[0042] S205, Extract the precise ranging result of the super-resolution symbol phase. In this embodiment of the invention, the ranging identifier obtained by demodulating the received signal is triggered, the precise ranging result of the super-resolution symbol phase is extracted, and the result is sent out to complete the communication ranging function.

[0043] In the above method, the phase detection gain coefficient is corrected by real-time amplitude monitoring, so that the clock phase error phase detection result does not change with the amplitude of the received optical signal, thereby improving the ranging accuracy under dynamic amplitude variation conditions of the laser inter-satellite link.

[0044] Based on the same technological concept, such as Figure 2 As shown, this embodiment of the invention also provides an optimization device for improving the ranging accuracy of laser inter-satellite communication ranging links, including an analog-to-digital converter and a digital clock recovery loop;

[0045] The analog-to-digital converter (ADC) is used to acquire sampling data of photoelectric detection signals from the laser inter-satellite communication ranging link in real time;

[0046] The digital clock recovery loop is used to recover the digital clock from the sampled data and extract the precise ranging results of the super-resolution symbol phase; the digital clock recovery loop includes:

[0047] The interpolation filter unit is used to interpolate and recover the sampled data according to the current loop interpolation parameters; the loop interpolation parameters refer to the loop interpolation interval.

[0048] The digital phase detector unit is used to detect clock phase errors in the interpolated data.

[0049] The signal amplitude monitoring unit is used to correct the phase detection gain coefficient of the digital phase detection unit by real-time amplitude monitoring of the interpolated recovered data.

[0050] The digital loop filter unit is used to filter the clock phase error phase detection results;

[0051] The numerically controlled oscillator unit is used to update the loop interpolation parameters and the super-resolution symbol phase accurate ranging results using the filtered clock phase error phase detection results.

[0052] The specific working principles of each functional unit in the above-mentioned device can be referred to the description in the foregoing method embodiments, and will not be repeated here.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optimized method for improving the ranging accuracy of laser inter-satellite communication ranging links, characterized in that, include: Real-time acquisition of sampling data of photoelectric detection signals from laser inter-satellite communication ranging links; Digital clock recovery of sampled data: The sampled data is reconstructed by interpolation based on the current loop interpolation parameters; Clock phase error detection is performed on the interpolated data, which requires correction of the phase detection gain coefficient by real-time amplitude monitoring of the interpolated data; Filter the clock phase error phase detection results; The loop interpolation parameters and the super-resolution symbol phase accurate ranging results are updated using the filtered clock phase error phase detection results. Extract the phase of the super-resolution symbol for accurate ranging.

2. The optimization method for improving the ranging accuracy of laser inter-satellite communication ranging links according to claim 1, characterized in that, By monitoring the average amplitude change of the interpolated data in real time, the real-time signal amplitude |A(t)| is obtained, and the phase detection gain coefficient Kd=1 / |A(t)| of the digital phase detection unit is corrected in real time.

3. The optimization method for improving the ranging accuracy of laser inter-satellite communication ranging links according to claim 1, characterized in that, Based on the ranging identifier obtained by communication demodulation of the received signal, the super-resolution symbol phase is extracted to obtain the accurate ranging result.

4. An optimized device for improving the ranging accuracy of laser inter-satellite communication ranging links, characterized in that, Including analog-to-digital converters and digital clock recovery loops; The analog-to-digital converter is used to acquire sampling data of photoelectric detection signals from the laser inter-satellite communication ranging link in real time; The digital clock recovery loop is used to recover the digital clock from the sampled data and extract the precise ranging results of the super-resolution symbol phase. The digital clock recovery loop includes: The interpolation filter unit is used to interpolate and recover the sampled data based on the current loop interpolation parameters. The digital phase detector unit is used to detect clock phase errors in the interpolated data. The signal amplitude monitoring unit is used to correct the phase detection gain coefficient of the digital phase detection unit by real-time amplitude monitoring of the interpolated recovered data. The digital loop filter unit is used to filter the clock phase error phase detection results; The numerically controlled oscillator unit is used to update the loop interpolation parameters and the super-resolution symbol phase accurate ranging results using the filtered clock phase error phase detection results.

5. The optimization device for improving the ranging accuracy of laser inter-satellite communication ranging links according to claim 4, characterized in that, The signal amplitude monitoring unit is specifically used for: By monitoring the average amplitude change of the interpolated data in real time, the real-time signal amplitude |A(t)| is obtained, and the phase detection gain coefficient Kd=1 / |A(t)| of the digital phase detection unit is corrected in real time.

6. The optimization device for improving the ranging accuracy of laser inter-satellite communication ranging links according to claim 4, characterized in that, The digital clock recovery loop is specifically used for: Based on the ranging identifier obtained by communication demodulation of the received signal, the super-resolution symbol phase is extracted to obtain the accurate ranging result.

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