Scanning type coherent angle measurement device and method with variable baseline length

Abstract

The invention relates to a scanning type coherent angle measurement device and method with a variable baseline length. The device comprises an optical front end, a precise fast reflector, a beam splitter prism, a four-quadrant detector, a signal processing module and an upper computer. The optical front end is used for converging signal light to be measured and coupling the signal light to the interior of the system; the precise fast reflecting mirror is used for reflecting the signal light processed by the optical front end; the beam splitter prism is used for enabling the transmitted signal light to be overlapped with the reflected collimation local oscillation light; the four-quadrant detector is used for receiving a beat frequency signal generated by coherent mixing; the signal processing module is used for collecting and analyzing electric signals output by the four-quadrant detector; the upper computer is used for controlling the fast precision fast reflecting mirror to execute nutation scanning according to a nutation algorithm and calculating the angle miss distance through the phase discrimination arithmetic unit. According to the invention, the flexible switching between the angle measurement range and the precision can be realized, and the adaptability and the reliability are high.

Description

Technical Field

[0001] The present invention relates to the technical field of space laser communication, and in particular to a scanning coherent angle measurement device and method with variable baseline length. Background Art

[0002] Compared with traditional radio frequency communication, space laser communication has advantages such as wide communication bandwidth and large information capacity. However, due to the small beam divergence angle of space laser communication, a high-precision capture, tracking and aiming function system is required to build a stable and reliable communication link. Accurately detecting the angle off-target of the signal light has become a key problem in intersatellite coherent laser communication. Traditional analog interferometers measure angles based on the phase difference generated by the wave path difference of adjacent antennas, but there is a contradiction between the angle measurement range and accuracy, which makes it difficult to meet the diverse tracking and aiming needs of space laser communication.

[0003] Therefore, it is necessary to provide a new scanning coherent angle measurement device and method with variable baseline length. Summary of the invention

[0004] Based on the above problems existing in the prior art, an object of the embodiments of the present invention is to provide a scanning coherent angle measurement device with a variable baseline length, which can realize flexible switching of angle measurement range and accuracy and has strong adaptability and reliability.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a scanning coherent angle measuring device with variable baseline length, comprising: an optical front end, a precision fast reflector, a beam splitter prism, a four-quadrant detector, a signal processing module and a host computer;

[0006] The optical front end is used to converge the signal light to be measured and couple it into the system;

[0007] The precision fast reflector is used to reflect the signal light processed by the optical front end;

[0008] The beam splitter prism is used to overlap the transmitted signal light with the reflected collimated local oscillator light.

[0009] The four-quadrant detector is used to receive the beat frequency signal generated by coherent mixing;

[0010] The signal processing module is used to collect and analyze the electrical signals output by the four-quadrant detector;

[0011] The host computer is used to control the fast precision fast reflector to perform nutation scanning according to the nutation algorithm, and calculate the angle miss amount through the phase detector.

[0012] Furthermore, the signal processing module includes a transimpedance amplifier, a digital-to-analog converter and a digital phase meter. The transimpedance amplifier is used to convert four current signals into voltage signals and amplify them to obtain analog electrical signals. The analog-to-digital converter is used to convert the amplified analog electrical signals into digital signals.

[0013] Furthermore, the digital phase meter is built with a field programmable logic gate array and a 32-bit microcontroller as the hardware core. The digital phase meter is used to receive the digital signal output by the analog-to-digital converter, realize the real-time frequency phase comparison output of the four time points of the nutation, and obtain the key information related to the signal angle by analyzing the phase of the signal at different time points.

[0014] A scanning coherent angle measurement method with a variable baseline length is applied to the above-mentioned scanning coherent angle measurement device with a variable baseline length, and the method comprises:

[0015] S1, introducing the signal light to be measured into a scanning coherent angle measuring device with a variable baseline length after being processed by an optical front end;

[0016] S2, when there is an angle deviation between the signal light and the local oscillator light, the host computer controls the precision fast reflector to perform nutation scanning according to the nutation algorithm;

[0017] S3, the signal light after the precision fast reflector passes through the beam splitter prism and then enters the four-quadrant detector to output the electrical signal, and then enters the transimpedance amplifier in the signal processing module for amplification, the analog-to-digital converter for conversion, and then inputs into the digital phase meter;

[0018] S4, the digital phase meter outputs the phase information of the four time points of nutation to the phase detector of the host computer;

[0019] S5, the host computer calculates the angle miss distance through the phase detection algorithm.

[0020] Furthermore, the method of introducing the signal light to be measured into the scanning coherent angle measurement device with a variable baseline length after being processed by the optical front end includes: the optical front end is responsible for collecting and preliminarily processing the signal to be measured, the optical front end first collects the signal light through a specific element, and then uses a lens group or a reflector group to converge the light to improve the energy concentration, and then, with the help of optical fiber or waveguide, the converged signal light is coupled into the scanning coherent angle measurement device with a variable baseline length to provide a stable signal for subsequent mixing with the local oscillator light and angle measurement.

[0021] Furthermore, the host computer controls the precision fast reflector to perform nutation scanning according to the nutation algorithm, including: a nutation algorithm is preset in the host computer, and the nutation algorithm calculates the control instructions required for the precision fast reflector to perform nutation scanning according to preset parameters and expected angle measurement accuracy and range; when high-precision angle measurement is required, the nutation algorithm will adjust the control instructions so that the precision fast reflector performs a specific mode of nutation scanning to change the baseline length and thereby improve the accuracy; if a larger angle measurement range is required, the nutation algorithm will generate corresponding instructions to expand the scanning range.

[0022] Furthermore, the signal light after the precision fast reflection mirror passes through the dichroic prism and then enters the four-quadrant detector to output an electrical signal, including: the signal light reflected by the precision fast reflection mirror is emitted to the dichroic prism, the dichroic prism transmits the signal light, and the transmitted signal light overlaps with the collimated local oscillator light reflected by the dichroic prism under the action of the dichroic prism, and due to the frequency difference between the two, coherent mixing occurs, and the generated beat frequency signal is projected onto the photosensitive surface of the four-quadrant detector, and the four-quadrant detector converts the optical signal into an electrical signal.

[0023] Furthermore, the transimpedance amplifier performs amplification, the analog-to-digital converter performs conversion and then inputs into the digital phase meter, comprising: the transimpedance amplifier converts the current signal output by the four-quadrant detector into a voltage signal, and amplifies the voltage signal to obtain an analog electrical signal; the analog-to-digital converter converts the amplified analog electrical signal into a digital signal; the digital phase meter receives the digital signal output by the analog-to-digital converter, realizes real-time frequency phase comparison output at four time points of nutation, and obtains key information related to the signal angle by analyzing the phase of the signals at different time points.

[0024] The embodiment of the present invention further provides a network side server, including:

[0025] At least one processor; and a memory in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the above-mentioned scanning coherent angle measurement method with variable baseline length.

[0026] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the above-mentioned scanning coherent angle measurement method with a variable baseline length is implemented.

[0027] The beneficial effects of the present invention are as follows: the scanning coherent angle measuring device with variable baseline length of the present invention comprises: an optical front end, a precision fast reflector, a beam splitter, a four-quadrant detector, a signal processing module and a host computer, the optical front end is used to converge the signal light to be measured and couple it to the inside of the system, the precision fast reflector is used to reflect the signal light processed by the optical front end, the optical prism is used to overlap the transmitted signal light with the reflected collimated local oscillator light, the four-quadrant detector is used to receive the beat frequency signal generated by coherent mixing, the signal processing module is used to collect and analyze the electrical signal output by the four-quadrant detector, and the host computer is used to control the precision fast reflector to perform nutation scanning according to the nutation algorithm, and calculate the angle miss amount through the phase detector. The scanning coherent angle measuring device with variable baseline length of the present invention has a simple structure, can flexibly adjust the nutation scanning angle γ according to specific task requirements, realize flexible switching of the angle measurement range and accuracy, can work efficiently in different intersatellite laser communication task scenarios, and has strong adaptability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] In the figure:

[0030] Figure 1 A schematic structural diagram of a scanning coherent angle measuring device with a variable baseline length provided in the first embodiment of the present invention;

[0031] Figure 2 A schematic diagram of axis 1 and axis 2 capable of nutation scanning provided in the first embodiment of the present invention;

[0032] Figure 3 A schematic diagram of nutation scanning provided in Embodiment 1 of the present invention;

[0033] Figure 4 A schematic diagram of another viewing angle of nutation scanning provided in the first embodiment of the present invention;

[0034] Figure 5 A schematic flow chart of a scanning coherent angle measurement method with a variable baseline length provided in the second embodiment of the present invention;

[0035] Figure 6 A phase angle relationship curve diagram when the nutation scanning angle is 1 mrad provided in the second embodiment of the present invention;

[0036] Figure 7 A phase angle relationship curve diagram when the nutation scanning angle is 0.1 mrad provided in the second embodiment of the present invention;

[0037] Figure 8 It is a structural diagram of a network-side server provided according to a third embodiment of the present invention.

[0038] Among them, the reference numerals in the figure are:

[0039] A scanning coherent angle measuring device 100 with variable baseline length;

[0040] Optical front end 1, precision fast reflecting mirror 2, beam splitter prism 3, four-quadrant detector 4, signal processing module 5, impedance amplifier 51, digital-to-analog converter 52, digital phase meter 53, host computer 6. DETAILED DESCRIPTION

[0041] It should be mentioned before discussing the exemplary embodiments in more detail that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the operations as sequential processes, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0042] It should be understood that, although the terms "first", "second", etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are used only to distinguish one unit from another unit. For example, without departing from the scope of the exemplary embodiments, the first unit may be referred to as the second unit, and similarly the second unit may be referred to as the first unit. The term "and / or" used herein includes any and all combinations of one or more of the listed associated items.

[0043] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0044] First embodiment:

[0045] like Figure 1 As shown, a scanning coherent angle measuring device 100 with a variable baseline length of the present invention comprises: an optical front end 1, a precision fast reflector 2, a beam splitter prism 3, a four-quadrant detector 4, a signal processing module 5 and a host computer 6.

[0046] In some of the embodiments, the optical front end 1 is located at the starting position of the device signal input, and is used to receive and pre-process the signal light to be measured, converge it and couple it into the system, and the processed signal light is transmitted to the precision fast reflection mirror 2. The precision fast reflection mirror 2 adjusts the direction of the signal light according to the control instructions of the host computer 6 so that the signal light is directed to the beam splitter prism 3.

[0047] Specifically, the optical front end 1 is used to converge the signal light to be measured and couple it into the system. On the one hand, the optical front end 1 converges the scattered signal light through optical elements such as lenses and reflectors, improves the light energy concentration, and enhances the system's ability to detect signals; on the other hand, the optical front end 1 uses optical fibers, waveguides and other elements to couple the converged signal light into the system to ensure stable and efficient signal transmission, and provide reliable signal input for subsequent links such as mixing with local oscillator light and angle measurement. The precision fast reflector 2 is used to reflect the signal light processed by the optical front end. The precision fast reflector 2 has high-precision angle control capabilities and can accurately adjust the reflection direction of the signal light. When performing nutation scanning, the host computer 6 accurately controls the precision fast reflector 2 according to the nutation algorithm, so that the signal light beam is scanned around the point to be measured at the set offset γ angle.

[0048] In some embodiments, the beam splitter prism 3 is used to overlap the transmitted signal light with the reflected collimated local oscillator light. Specifically, the beam splitter prism 3 transmits the signal light reflected by the precision fast reflector 2, and reflects the collimated local oscillator light at the same time. Through ingenious optical design, the beam splitter prism 3 can accurately guide the transmitted signal light and the reflected local oscillator light to overlap in space. Due to the frequency difference between the signal light and the local oscillator light, coherent mixing will occur after the two overlap, and the generated beat frequency signal will be projected onto the four-quadrant detector 4.

[0049] In some embodiments, the four-quadrant detector 4 is used to receive the beat frequency signal generated by coherent mixing. The four-quadrant detector 4 converts the received optical signal into an electrical signal, and the four-quadrant structure can accurately distinguish the intensity distribution of the optical signal in different regions.

[0050] In some embodiments, the signal processing module 5 is used to collect and analyze the electrical signal output by the four-quadrant detector 4. After receiving the beat frequency signal, the four-quadrant detector 4 will output four electrical signals, and the four electrical signals are uniformly processed by the signal processing module 5. The signal processing module 5 includes a transimpedance amplifier 51, a digital-to-analog converter 52, and a digital phase meter 53. The transimpedance amplifier 51 is used to convert the four current signals into voltage signals and amplify them to obtain analog electrical signals, increase the amplitude of the signals, and enhance the anti-interference ability of the signals; through amplification processing, the signals are made more stable and reliable in the subsequent transmission and processing process, laying the foundation for the subsequent accurate extraction of signal features. The analog-to-digital converter 52 is used to convert the amplified analog electrical signals into digital signals. The digital phase meter 53 is built with a field programmable gate array (FPGA) and a 32-bit microcontroller (ARM) as the hardware core. The digital phase meter 53 is used to receive the digital signal output by the analog-to-digital converter 52, realize the real-time frequency phase comparison output of the four time points of the nutation, and obtain key information related to the signal angle by analyzing the phase of the signals at different time points. The signal processing module 5 transmits the phase information of the four nutation points to the phase detector of the host computer 6, and then calculates the angle miss amount.

[0051] In some embodiments, the host computer 6 is used to control the fast precision fast reflector 2 to perform nutation scanning according to the nutation algorithm, and calculate the angle miss amount through the phase detector. The host computer 6 is used to control the fast precision fast reflector 2 to perform nutation scanning according to the nutation algorithm. Specifically, when there is an angle deviation between the signal light and the local oscillator light, the host computer 6 sends a control instruction to the fast precision fast reflector 2 according to the preset nutation algorithm. Figure 2-4 As shown, by precisely controlling the movement of the reflector, the signal light beam is nutated and scanned at the same γ angle along the positive and negative semi-axis offsets of axis 1 and axis 2 around the point to be measured. The change of the nutation angle γ will change the distances of d1 and d2 on the corresponding axis, thereby changing the baseline length. Increasing the γ angle increases the lengths of d1 and d2, extends the baseline, improves the angle measurement accuracy, but reduces the unambiguous angle measurement range; reducing the γ angle shortens the lengths of d1 and d2, shortens the baseline, increases the unambiguous angle measurement range, and reduces the angle measurement accuracy. In this way, the angle measurement range and accuracy can be flexibly adjusted according to the actual task requirements. By adjusting the nutation scanning angle γ and changing the baseline length, the flexible adjustment of the angle measurement accuracy and range can be achieved. The host computer 6 calculates the angle miss amount through the phase detector. Specifically, the signal processing module 5 transmits the phase information of the four nutation points output by the digital phase meter 53 to the host computer 6. The phase detector in the host computer 6 uses the received phase information to calculate through a specific phase detector algorithm, thereby obtaining the angle miss amount between the signal light and the local oscillator light.

[0052] The scanning coherent angle measuring device with a variable baseline length of the present invention comprises: an optical front end 1, a precision fast reflector 2, a beam splitter prism 3, a four-quadrant detector 4, a signal processing module 5 and a host computer 6, wherein the optical front end 1 is used to converge the signal light to be measured and couple it to the inside of the system, the precision fast reflector 2 is used to reflect the signal light processed by the optical front end, the optical prism 3 is used to overlap the transmitted signal light with the reflected collimated local oscillator light, the four-quadrant detector 4 is used to receive the beat frequency signal generated by coherent mixing, the signal processing module 5 is used to collect and analyze the electrical signal output by the four-quadrant detector 4, and the host computer 6 is used to control the precision fast reflector 2 to perform nutation scanning according to a nutation algorithm, and calculate the angle miss amount through a phase detector operator; the scanning coherent angle measuring device with a variable baseline length of the present invention has a simple structure, can flexibly adjust the nutation scanning angle γ according to specific task requirements, realize flexible switching of the angle measurement range and accuracy, can work efficiently in different intersatellite laser communication task scenarios, and has strong adaptability and reliability.

[0053] like Figure 5 As shown, a flow chart of a scanning coherent angle measurement method with a variable baseline length proposed by the present invention.

[0054] As an example, the scanning coherent angle measurement method with a variable baseline length includes:

[0055] Step S1, introducing the signal light to be measured into a scanning coherent angle measuring device with a variable baseline length after being processed by an optical front end.

[0056] Specifically, the optical front end is responsible for collecting and preliminarily processing the signal to be measured. The optical front end first collects the signal light through specific components, and then uses a lens group or a reflector group to converge the light to improve the energy concentration. Subsequently, the converged signal light is coupled into a scanning coherent angle measurement device with a variable baseline length with the help of optical fiber or waveguide, providing a stable signal for subsequent mixing with the local oscillator light and angle measurement.

[0057] Step S2: When there is an angle deviation between the signal light and the local oscillator light, the host computer controls the precise fast reflection mirror to perform nutation scanning according to the nutation algorithm.

[0058] Specifically, the signal light enters the scanning coherent angle measuring device with a variable baseline length from the optical front end, and interacts with the local oscillator light generated in the device. Due to various factors, such as the relative position change between the transmitter and the receiver, environmental interference, etc., it is difficult for the signal light and the local oscillator light to always remain completely coincident, and an angle deviation will occur. When an angle deviation between the signal light and the local oscillator light is detected, the control process of the host computer will be triggered.

[0059] The host computer has a preset nutation algorithm. The nutation algorithm calculates the control instructions required for the precision fast reflector to perform nutation scanning based on the preset parameters and the expected angle measurement accuracy and range. When high-precision angle measurement is required, the nutation algorithm will adjust the control instructions so that the precision fast reflector performs a specific mode of nutation scanning to change the baseline length and improve the accuracy; if a larger angle measurement range is required, the nutation algorithm will generate corresponding instructions to expand the scanning range.

[0060] The host computer sends a control command to the precision fast reflector according to the calculation result of the nutation algorithm. After receiving the control command, the precision fast reflector controls the signal beam to perform nutation scanning around the test point along the positive and negative semi-axes of axis 1 and axis 2 with the same γ offset. When the nutation angle γ changes, the two distances d1 and d2 on the corresponding axis will also change accordingly, and the baseline will also change accordingly, such as Figure 4 As shown in the figure, when the nutation angle γ is increased, the lengths of d1 and d2 will be enlarged, thereby lengthening the baseline. At this time, the accuracy of the angle measurement system is improved, but the unambiguous angle measurement range will be reduced accordingly. On the contrary, if the nutation angle γ is reduced, that is, the lengths of d1 and d2 are reduced, the baseline will be shortened, and accordingly, the unambiguous angle measurement range will be increased, while the accuracy of the angle measurement system will be reduced, thereby enabling flexible changes in the angle measurement and its range.

[0061] Step S3, the signal light after the precision fast reflection mirror passes through the beam splitter prism and then enters the four-quadrant detector to output an electrical signal, and then enters the transimpedance amplifier in the signal processing module for amplification, the analog-to-digital converter for conversion, and then inputs into the digital phase meter.

[0062] Specifically, the signal light after the precision fast reflection mirror passes through the dichroic prism and then enters the four-quadrant detector to output an electrical signal, including: the signal light reflected by the precision fast reflection mirror is emitted to the dichroic prism, the dichroic prism transmits the signal light, and the transmitted signal light overlaps with the collimated local oscillator light reflected by the dichroic prism under the action of the dichroic prism. Due to the frequency difference between the two, coherent mixing occurs, and the generated beat frequency signal is projected onto the photosensitive surface of the four-quadrant detector, and the four-quadrant detector converts the optical signal into an electrical signal.

[0063] The transimpedance amplifier is amplified, and the analog-to-digital converter is converted and input into the digital phase meter, including: the transimpedance amplifier converts the current signal output by the four-quadrant detector into a voltage signal, and amplifies the voltage signal to obtain an analog electrical signal, and through the amplification effect, the amplitude of the electrical signal is increased to a level suitable for subsequent processing, thereby enhancing the strength and anti-interference ability of the signal, making the signal more stable and reliable during transmission and further processing. The analog-to-digital converter converts the amplified analog electrical signal into a digital signal, including: sampling the analog signal according to a preset sampling frequency, and quantizing the sampled value into a digital quantity. The transimpedance amplifier 51 is used to convert the 4-way current signal into a voltage signal and amplify it to obtain an analog electrical signal, increase the amplitude of the signal, and enhance the anti-interference ability of the signal; through amplification processing, the signal is more stable and reliable during subsequent transmission and processing, laying the foundation for the subsequent accurate extraction of signal features. The analog-to-digital converter 52 is used to convert the amplified analog electrical signal into a digital signal. The digital phase meter is built with a field programmable gate array (FPGA) and a 32-bit microcontroller (ARM) as the hardware core. The digital phase meter receives the digital signal output by the analog-to-digital converter, realizes the real-time frequency phase comparison output at four time points of nutation, and obtains key information related to the signal angle by analyzing the phase of the signal at different time points.

[0064] Step S4, the digital phase meter outputs the phase information of the four nutation time points to the phase detector of the host computer.

[0065] Specifically, the digital phase meter realizes the real-time frequency phase comparison output at the four time points of nutation, and transmits the phase information to the phase detector of the host computer. The phase detector uses a specific phase detector algorithm to calculate the angle miss amount based on the phase information of the four nutation points received. In this process, the change of the nutation scanning angle γ will change the baseline length, affect the angle measurement accuracy and range, and then affect the calculation result of the angle miss amount.

[0066] As an example, from the theoretical derivation level, under the conditions that the wavelength of the incident signal light is 1550nm and the distance between the precision fast reflector and the detector is 0.25m, different nutation scanning angles γ correspond to different angle measurement ranges and accuracies, which will also affect the calculation of the angle miss amount. Figure 6 As shown in the figure, when the nutation scanning angle γ is 1 mrad, the angle measurement range is ±2.6 mrad, and the accuracy is 0.0008276 rad / rad; Figure 7 As shown in the figure, when the nutation scanning angle γ is 0.1mrad, the angle measurement range is ±30.9mrad and the accuracy is 0.0098rad / rad. The changes in these parameters will change the phase relationship between the signal light and the local oscillator light in the interference process, thereby affecting the calculated value of the final angle miss.

[0067] Step S5: The host computer calculates the angle miss distance through a phase detection algorithm.

[0068] Specifically, the phase detector in the host computer uses a specific phase detector algorithm to analyze the input phase information. The phase detector algorithm is based on the principle of optical interference and signal processing theory, the frequency difference between the signal light and the local oscillator light, the nutation scanning angle γ, and the geometric structure parameters of the device (such as the distance between the precision fast reflector and the detector). Through complex mathematical models and logical operations, the phase detector algorithm can extract key features related to the angle deviation from the phase information for calculation and processing, and finally obtain the angle miss between the signal light and the local oscillator light.

[0069] A second embodiment of the present invention provides a scanning coherent angle measurement method with a variable baseline length, comprising: introducing the signal light to be measured into a scanning coherent angle measurement device with a variable baseline length after being processed by an optical front end; when there is an angle deviation between the signal light and the local oscillator light, the host computer controls the precision fast reflection mirror to perform nutation scanning according to the nutation algorithm; the signal light after the precision fast reflection mirror passes through a beam splitter prism and then enters a four-quadrant detector to output an electrical signal, and then enters a transimpedance amplifier in a signal processing module for amplification, an analog-to-digital converter for conversion, and then inputs into a digital phase meter; the digital phase meter outputs phase information of four nutation time points to the phase detector of the host computer; the host computer calculates the angle miss amount through the phase detector algorithm. The present invention can flexibly adjust the angle measurement performance parameters of the system according to specific task requirements. When a large angle measurement range is required, the nutation scanning angle γ can be enlarged to increase the large-range scanning capability of the system and realize effective detection of the target area. When a larger angle measurement accuracy is required, the nutation scanning angle γ can be reduced to narrow the detection range of the system and further improve the detection accuracy, so that the intersatellite laser communication system can measure and track the target more accurately, work efficiently in different intersatellite laser communication task scenarios, and have strong adaptability and reliability.

[0070] Third embodiment:

[0071] A third embodiment of the present invention provides a network side server, such as Figure 8 As shown, it includes at least one processor 301; and a memory 302 that is communicatively connected to the at least one processor 301; wherein the memory 302 stores commands that can be executed by at least one processor 301, and the instructions are executed by at least one processor 301, so that at least one processor 301 can execute the above-mentioned data processing method.

[0072] The memory 302 and the processor 301 are connected in a bus manner, and the bus may include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors 301 and the memory 302 together. The bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be one element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices on a transmission medium. The data processed by the processor 301 is transmitted on a wireless medium through an antenna, and further, the antenna also receives data and transmits the data to the processor 301.

[0073] The processor 301 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management and other control functions. The memory 302 can be used to store data used by the processor 301 when performing operations.

[0074] Fourth embodiment:

[0075] A fourth embodiment of the present invention provides a computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the scanning coherent angle measurement method with a variable baseline length in the second embodiment is implemented.

[0076] That is, those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. 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 and other media that can store program codes.

[0077] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A scanning coherent angle measuring device with variable baseline length, characterized in that: include: Optical front end, precision fast reflector, beam splitter, four-quadrant detector, signal processing module and host computer; The optical front end is used to converge the signal light to be measured and couple it into the system; The precision fast reflector is used to reflect the signal light processed by the optical front end; The beam splitter prism is used to overlap the transmitted signal light with the reflected collimated local oscillator light. The four-quadrant detector is used to receive the beat frequency signal generated by coherent mixing; The signal processing module is used to collect and analyze the electrical signals output by the four-quadrant detector; The host computer is used to control the fast precision fast reflector to perform nutation scanning according to the nutation algorithm, and calculate the angle miss amount through the phase detector.

2. The scanning coherent angle measuring device with variable baseline length according to claim 1, characterized in that: The signal processing module includes a transimpedance amplifier, a digital-to-analog converter and a digital phase meter. The transimpedance amplifier is used to convert four current signals into voltage signals and amplify them to obtain analog electrical signals. The analog-to-digital converter is used to convert the amplified analog electrical signals into digital signals.

3. The scanning coherent angle measuring device with variable baseline length according to claim 2, characterized in that: The digital phase meter is built with a field programmable logic gate array and a 32-bit microcontroller as the hardware core. The digital phase meter is used to receive the digital signal output by the analog-to-digital converter, realize the real-time frequency phase comparison output of the four time points of the nutation, and obtain key information related to the signal angle by analyzing the phase of the signal at different time points.

4. A scanning coherent angle measurement method with variable baseline length, characterized in that: The scanning coherent angle measuring device with variable baseline length applied to claim 1, the method comprising: S1, introducing the signal light to be measured into a scanning coherent angle measuring device with a variable baseline length after being processed by an optical front end; S2, when there is an angle deviation between the signal light and the local oscillator light, the host computer controls the precision fast reflector to perform nutation scanning according to the nutation algorithm; S3, the signal light after the precision fast reflector passes through the beam splitter prism and then enters the four-quadrant detector to output the electrical signal, and then enters the transimpedance amplifier in the signal processing module for amplification, the analog-to-digital converter for conversion, and then inputs into the digital phase meter; S4, the digital phase meter outputs the phase information of the four time points of nutation to the phase detector of the host computer; S5, the host computer calculates the angle miss distance through the phase detection algorithm.

5. The scanning coherent angle measurement method with variable baseline length according to claim 4, characterized in that: The method of introducing the signal light to be measured into the scanning coherent angle measuring device with a variable baseline length after being processed by an optical front end includes: the optical front end is responsible for collecting and preliminarily processing the signal to be measured, the optical front end first collects the signal light through a specific element, and then uses a lens group or a reflector group to converge the light to improve the energy concentration, and then, with the help of an optical fiber or a waveguide, the converged signal light is coupled into the scanning coherent angle measuring device with a variable baseline length to provide a stable signal for subsequent mixing with the local oscillator light and angle measurement.

6. The scanning coherent angle measurement method with variable baseline length according to claim 4, characterized in that: The host computer controls the precision fast reflector to perform nutation scanning according to the nutation algorithm, including: a nutation algorithm is preset in the host computer, and the nutation algorithm calculates the control instructions required for the precision fast reflector to perform nutation scanning according to preset parameters and expected angle measurement accuracy and range; when high-precision angle measurement is required, the nutation algorithm adjusts the control instructions so that the precision fast reflector performs a specific mode of nutation scanning to change the baseline length and thus improve the accuracy; if a larger angle measurement range is required, the nutation algorithm generates corresponding instructions to expand the scanning range.

7. The scanning coherent angle measurement method with variable baseline length according to claim 4, characterized in that: The signal light after the precision fast reflection mirror passes through the dichroic prism and then enters the four-quadrant detector to output an electrical signal, including: the signal light reflected by the precision fast reflection mirror is directed to the dichroic prism, the dichroic prism transmits the signal light, and the transmitted signal light overlaps with the collimated local oscillator light reflected by the dichroic prism under the action of the dichroic prism, and coherent mixing occurs due to the frequency difference between the two, and the generated beat frequency signal is projected onto the photosensitive surface of the four-quadrant detector, and the four-quadrant detector converts the optical signal into an electrical signal.

8. The scanning coherent angle measurement method with variable baseline length according to claim 4, characterized in that: The transimpedance amplifier performs amplification, the analog-to-digital converter performs conversion and then inputs the a digital phase meter, comprising: the transimpedance amplifier converts the current signal output by the four-quadrant detector into a voltage signal, and amplifies the voltage signal to obtain an analog electrical signal; the analog-to-digital converter converts the amplified analog electrical signal into a digital signal; the digital phase meter receives the digital signal output by the analog-to-digital converter, realizes real-time frequency phase comparison output at four time points of nutation, and obtains key information related to the signal angle by analyzing the phase of the signals at different time points.

9. A network side server, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the scanning coherent angle measurement method with a variable baseline length as claimed in any one of claim 4.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the scanning coherent angle measurement method with a variable baseline length as claimed in any one of claim 4 is implemented.

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