Delay compensation device, delay compensation method and phased array laser terminal

Abstract

The invention discloses a delay compensation device, a delay compensation method and a phased array laser terminal, a plurality of emission light paths, a sampling monitoring module and a phased array antenna are in communication connection in sequence, and each emission light path comprises a first light delay line and a first high-speed phase shifter; the sampling monitoring module is used for determining a first delay control parameter and a first phase control parameter or a second delay control parameter and a second phase control parameter according to the optical path difference; the first optical delay line performs first optical path difference delay compensation on the laser beam; the first high-speed phase shifter performs first phase difference delay compensation on the laser beam; and the phased-array antenna performs second optical path difference delay compensation and second phase difference compensation on the laser beam according to the second delay control parameter and the second phase control parameter. According to the embodiment of the invention, delay compensation is carried out on the laser beam through the first optical delay line, the first high-speed phase shifter and the phased array antenna, the problems of phase jump and wavelength dispersion in phased array communication are solved, and the communication capacity is improved.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and particularly relates to a delay compensation device, a delay compensation method, and a phased array laser terminal. Background Art

[0002] The beamforming methods mainly include switch array antenna beamforming, digital signal phase processing-based beamforming, and precoding beamforming. In traditional analog control beamforming, for digital signal processing-based beamforming, the beam direction is changed by changing the phase of each antenna. Among them, each antenna element has an optical phase shifter for beamforming pointing.

[0003] In the prior art, the phased array beam pointing is shaped by an optical phase shifter, mainly by using the optical phase shifter to perform optical phase periodic compensation. However, due to the fixed optical path difference that is an integer multiple of the wavelength and the large-range variable optical path difference caused by the movement of the two terminals, it will lead to a reduction in communication capacity and cause problems such as optical phase jump and wavelength dispersion. Summary of the Invention

[0004] The present invention provides a delay compensation device, a delay compensation method, and a phased array laser terminal to solve the problems in the prior art that the fixed optical path difference leads to a reduction in communication capacity and causes optical phase jump and wavelength dispersion.

[0005] In a first aspect, the present application provides a delay compensation device, including: a plurality of transmission optical paths, a sampling and monitoring module, and a phased array antenna. For each transmission optical path, the transmission optical path includes a first optical delay line and a first high-speed phase shifter;

[0006] The plurality of transmission optical paths, the sampling and monitoring module, and the phased array antenna are communicatively connected in sequence;

[0007] The sampling and monitoring module is configured to sample the laser beam to determine the optical path difference. If the laser beam is emitted by the optical module, the first delay control parameter and the first phase control parameter are determined according to the optical path difference. If the laser beam is received by the phased array antenna, the second delay control parameter and the second phase control parameter are determined according to the optical path difference;

[0008] The first optical delay line is configured to perform first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter;

[0009] The first high-speed phase shifter is configured to perform first phase difference delay compensation on the laser beam emitted by the optical module according to the first phase control parameter;

[0010] The phased array antenna is used to perform second optical path difference delay compensation and second phase difference compensation on the laser beam emitted by the optical module according to the second delay control parameter and the second phase control parameter.

[0011] In a possible implementation manner, if the laser beam is emitted by the optical module, the sampling and monitoring module is specifically configured to:

[0012] According to a first preset relationship, use the delay control parameter corresponding to the integer value of the optical path difference as the first delay control parameter, and according to a second preset relationship, use the phase control parameter corresponding to the fractional value of the optical path difference as the first phase control parameter;

[0013] If the laser beam is received by the phased array antenna, the sampling and monitoring module is specifically configured to:

[0014] According to a third preset relationship, use the delay control parameter corresponding to the integer value of the optical path difference as the second delay control parameter, and according to a fourth preset relationship, use the phase control parameter corresponding to the fractional value of the optical path difference as the second phase control parameter.

[0015] In a possible implementation manner, the phased array antenna includes a second high-speed phase shifter corresponding to each emission optical path, a second optical delay line connected to the second high-speed phase shifter, and a TR component;

[0016] The second high-speed phase shifter is used to perform second phase difference delay compensation on the laser beam emitted by the optical module according to the second phase control parameter;

[0017] The second optical delay line is used to perform second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter.

[0018] In a possible implementation manner, the second optical delay line is specifically configured to:

[0019] Adopt the stochastic gradient descent algorithm to perform second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter.

[0020] In a possible implementation manner, the first optical delay line is specifically configured to:

[0021] Adopt the stochastic gradient descent algorithm to perform first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter.

[0022] In a second aspect, an embodiment of the present application further provides a phased array laser terminal, including an optical module and the delay compensation device according to any one of the first aspect;

[0023] An optical module for emitting laser light;

[0024] The optical fiber splitter is used to split the laser light into multiple laser beams.

[0025] In a third aspect, the present application provides a delay compensation method, which is applied to the delay compensation device described in any one of the first aspects, or the phased array laser terminal described in the second aspect. The method includes:

[0026] The sampling monitoring module samples the laser beam to determine the optical path difference. If the laser beam is emitted by the optical module, the first delay control parameter and the first phase control parameter are determined according to the optical path difference. If the laser beam is received by the phased array antenna, the second delay control parameter and the second phase control parameter are determined according to the optical path difference;

[0027] The first optical delay line performs first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter;

[0028] The first high-speed phase shifter performs first phase difference delay compensation on the laser beam emitted by the optical module according to the first phase control parameter;

[0029] The phased array antenna performs second optical path difference delay compensation and second phase difference compensation on the laser beam emitted by the optical module according to the second delay control parameter and the second phase control parameter.

[0030] In a possible implementation manner, if the laser beam is emitted by the optical module, the method includes:

[0031] Through the sampling monitoring module, according to the first preset relationship, the delay control parameter corresponding to the integer value of the optical path difference is used as the first delay control parameter, and according to the second preset relationship, the phase control parameter corresponding to the fractional value of the optical path difference is used as the first phase control parameter;

[0032] If the laser beam is received by the phased array antenna, the method includes:

[0033] Through the sampling monitoring module, according to the third preset relationship, the delay control parameter corresponding to the integer value of the optical path difference is used as the second delay control parameter, and according to the fourth preset relationship, the phase control parameter corresponding to the fractional value of the optical path difference is used as the second phase control parameter.

[0034] In a possible implementation manner, the phased array antenna includes a second high-speed phase shifter corresponding to each emission optical path, a second optical delay line connected to the second high-speed phase shifter, and a TR component;

[0035] Through the second high-speed phase shifter, perform a second phase difference delay compensation on the laser beam emitted by the optical module according to the second phase control parameter;

[0036] Through the second optical delay line, perform a second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter.

[0037] In a possible implementation manner, the method further includes:

[0038] Through the second optical delay line, adopt the random gradient descent algorithm, and perform a second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter.

[0039] In a possible implementation manner, the method further includes:

[0040] Through the first optical delay line, adopt the random gradient descent algorithm, and perform a first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter.

[0041] The beneficial effects of the present invention are as follows:

[0042] A delay compensation device, a delay compensation method and a phased array laser terminal provided by the present application. The delay compensation device includes: a plurality of emission optical paths, a sampling and monitoring module, and a phased array antenna. Among them, for each emission optical path, the emission optical path includes a first optical delay line and a first high-speed phase shifter; the plurality of emission optical paths, the sampling and monitoring module, and the phased array antenna are sequentially communicatively connected; the sampling and monitoring module is configured to sample the laser beam and determine the optical path difference. If the laser beam is emitted by the optical module, determine the first delay control parameter and the first phase control parameter according to the optical path difference. If the laser beam is received by the phased array antenna, determine the second delay control parameter and the second phase control parameter according to the optical path difference; the first optical delay line is configured to perform a first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter; the first high-speed phase shifter is configured to perform a first phase difference delay compensation on the laser beam emitted by the optical module according to the first phase control parameter; the phased array antenna is configured to perform a second optical path difference delay compensation and a second phase difference compensation on the laser beam emitted by the optical module according to the second delay control parameter and the second phase control parameter. In the embodiments of the present application, the laser beam emitted by the optical module is delay-compensated through the first optical delay line, the first high-speed phase shifter, and the phased array antenna, so as to achieve complete compensation for the laser beam, solve the problems of phase jump and wavelength dispersion in phased array communication, and improve the communication capacity. Description of the Drawings

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0044] Figure 1 Structural diagram of a delay compensation device provided by an embodiment of the present application;

[0045] Figure 2 Principle diagram of collecting optical path difference through a sensor provided by an embodiment of the present application;

[0046] Figure 3 Principle diagram of performing equal-length test on the front end and the rear end of transmission provided by an embodiment of the present application;

[0047] Figure 4 Structural diagram of another delay compensation device provided by an embodiment of the present application;

[0048] Figure 5 Schematic diagram of a sampling control optical path provided by an embodiment of the present application;

[0049] Figure 6 Flow chart of a delay compensation method provided by the present application;

[0050] Figure 7 Structural diagram of a phased array laser terminal provided by an embodiment of the present application. Detailed implementation manners

[0051] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following will further describe the present invention in detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0052] Moreover, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B can represent A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality of" means two or more than two.

[0053] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and should not be construed as implying or suggesting relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0054] The methods of beamforming mainly include switched array antenna beamforming, digital signal phase processing-based beamforming, and precoding beamforming. Switched array antenna beamforming refers to selectively turning on or off antennas in the antenna system array to change the beam direction. Precoding beamforming refers to changing the beam direction by applying a specific precoding matrix. Conventional analog control beamforming is based on digital signal processing beamforming, which changes the beam direction by changing the phase of each antenna. Among them, conventional analog control beamforming applies radio frequency signals to a plurality of antenna elements that make up the phased array antenna array, and each antenna element has an optical phase shifter for beamforming pointing.

[0055] In the prior art, for phased array beam pointing shaping through an optical phase shifter, it mainly compensates the optical phase periodically by using the optical phase shifter. However, due to the fixed optical path difference that is an integer multiple of the wavelength and the large-range variable optical path difference caused by the movement of the two terminals, it will lead to a reduction in communication capacity and cause problems such as optical phase jumps and wavelength dispersion.

[0056] Based on the above problems, the embodiments of the present application provide a delay compensation device, as Figure 1 shown, which is a structural diagram of a delay compensation device provided by the embodiments of the present application. The delay compensation device includes a plurality of transmission optical paths ( Figure 1 not shown in the figure), a sampling and monitoring module 102, and a phased array antenna 103. Among them, for each transmission optical path, the transmission optical path includes a first optical delay line 104 and a first high-speed phase shifter 105;

[0057] The plurality of transmission optical paths, the sampling and monitoring module 102, and the phased array antenna 103 are communicatively connected in sequence;

[0058] The sampling and monitoring module 102 is configured to sample the laser beam to determine the optical path difference. If the laser beam is emitted by the optical module, the first delay control parameter and the first phase control parameter are determined according to the optical path difference. If the laser beam is received by the phased array antenna, the second delay control parameter and the second phase control parameter are determined according to the optical path difference;

[0059] The first optical delay line 104 is configured to perform first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter;

[0060] The first high-speed phase shifter 105 is configured to perform a first phase difference delay compensation on the laser beam emitted by the optical module according to a first phase control parameter;

[0061] The phased array antenna 103 is configured to perform a second optical path difference delay compensation and a second phase difference compensation on the laser beam emitted by the optical module according to a second delay control parameter and a second phase control parameter.

[0062] A laser communication terminal provided by this application, an optical module, a plurality of transmitting optical paths, a sampling and monitoring module, and a phased array antenna are communicatively connected in sequence. Among them, for each transmitting optical path, the transmitting optical path includes a first optical delay line and a first high-speed phase shifter; the sampling and monitoring module is configured to sample the laser beam to determine the optical path difference. If the laser beam is emitted by the optical module, the first delay control parameter and the first phase control parameter are determined according to the optical path difference. If the laser beam is received by the phased array antenna, the second delay control parameter and the second phase control parameter are determined according to the optical path difference; the first optical delay line is configured to perform a first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter; the first high-speed phase shifter is configured to perform a first phase difference delay compensation on the laser beam emitted by the optical module according to the first phase control parameter; the phased array antenna is configured to perform a second optical path difference delay compensation and a second phase difference compensation on the laser beam emitted by the optical module according to the second delay control parameter and the second phase control parameter. In the embodiments of this application, the laser beam emitted by the optical module is subjected to delay compensation through the first optical delay line, the first high-speed phase shifter, and the phased array antenna, so as to achieve complete compensation for the laser beam, solve the problems of phase jump and wavelength dispersion in phased array communication, and improve the communication capacity.

[0063] It should be noted that the array elements form a matrix to form a phased array. In the phased array, when the array elements perform angle scanning, an optical path difference between the laser beams reflected by the array elements will be introduced. Among them, the optical path difference is the sum of a fixed optical path difference and a scanning delay. Since the delay amount of each array element is different, and the maximum can reach an optical path difference of 50 mm, it is possible to compensate this optical path difference. Moreover, only when the compensation accuracy meets the accuracy requirements of the optical phase shifter (20 nm) can the complete compensation of the optical phase of the laser phased array be achieved, and the problems of wavelength dispersion, limited communication capacity, and optical phase jump be solved.

[0064] In addition, as Figure 2 shown, it is a schematic diagram of collecting the optical path difference by a sensor provided by the embodiments of this application. The continuous optical path difference generated during the scanning process is collected by the sensor. Among them, the sensor is a position sensor or an angle sensor. The position sensor obtains the change amount ΔL of the optical path of each path in real time, and the angle sensor calculates the change amount ΔL of the optical path according to the position of the array element.

[0065] ΔLm,n =(x - x m )sinθ x (t)+(y - y m )sinθ y (t)

[0066] where x m and y m are the coordinates of the m-th array element, x and y are the central position coordinates, θ x and θ y are the rotation angles of the m-th array element at time t, ΔL m is the change in the optical path of the m-th array element, and n is the n-th time.

[0067] ΔL is fed back to the first high-speed phase shifter or the second high-speed phase shifter, according to the relationship with the voltage:

[0068]

[0069]

[0070] where is the phase change amount of the phase shifter, ΔL is the change in the optical path of the array element, π is the phase, λ is the wavelength, ΔV is the change in the driving voltage of the phase shifter, and k is the conversion coefficient between the first high-speed phase shifter or the second high-speed phase shifter and the driving voltage of the phase shifter. The change in the optical path is converted into a voltage value and assigned to each phase shifter to compensate for the phase difference caused by the change in the optical path.

[0071] In one embodiment, if the laser beam is emitted by the optical module, the sampling and monitoring module 102 is specifically configured to:

[0072] According to the first preset relationship, use the delay control parameter corresponding to the integer value of the optical path difference as the first delay control parameter, and according to the second preset relationship, use the phase control parameter corresponding to the fractional value of the optical path difference as the first phase control parameter;

[0073] If the laser beam is received by the phased array antenna 103, the sampling and monitoring module 102 is specifically configured to:

[0074] According to the third preset relationship, use the delay control parameter corresponding to the integer value of the optical path difference as the second delay control parameter, and according to the fourth preset relationship, use the phase control parameter corresponding to the fractional value of the optical path difference as the second phase control parameter.

[0075] For example, in a specific embodiment, taking an optical path difference of 3.4 mm as an example, if the laser beam is emitted by an optical module, the sampling and monitoring module is specifically configured to: according to a first preset relationship, use the delay control parameter corresponding to the integer value 3 of the optical path difference as the first delay control parameter, and according to a second preset relationship, use the phase control parameter corresponding to the decimal value 4 of the optical path difference as the first phase control parameter;

[0076] If the laser beam is received by a phased array antenna, the sampling and monitoring module is specifically configured to: according to a third preset relationship, use the delay control parameter corresponding to the integer value 3 of the optical path difference as the second delay control parameter, and according to a fourth preset relationship, use the phase control parameter corresponding to the decimal value 4 of the optical path difference as the second phase control parameter.

[0077] It should be noted that through equal-length testing for fixed compensation, equal-length testing is performed on the front end and the back end of the transmitter respectively. As Figure 3 shown, it is a schematic diagram of equal-length testing for the front end and the back end of the transmitter provided by an embodiment of the present application. Among them, the devices for testing include: a signal generator 301, an oscilloscope 302, a seed source 303, an amplifier 304, a modulator 305, a polarization controller 306, a phase shifter 307, and a photodetector 308.

[0078] The fixed compensation in the embodiment of the present application, that is, during the integration of the laser terminal, the fixed length difference generated by the fiber length and the spatial optical path, which is the part that does not change with scanning.

[0079] The signal generator 301 outputs two electrical signals. One is directly input as a reference signal to channel 1 of the oscilloscope 302, and the other passes through the modulator 305 to modulate the laser beam emitted by the multi-channel laser 1*1 channel. The output optical signal is subjected to photoelectric conversion through the photodetector 308, and the electrical signal at the output end of the photodetector 308 is input to channel 2 of the oscilloscope 302. At this time, by performing off-line cross-correlation data processing on the electrical signals of channel 1 and channel 2 of the oscilloscope 302, and measuring the relative time delay Δt1. Using the same operation method, the time delay of the 1*2 channel is measured as Δt2. Therefore, the time delay difference between the 1*1 and 1*2 channels is Δt = Δt1 - Δt2, and the propagation speed of the laser in the fiber is 2×10^8 m / s, then the difference in the relative fiber length between the two channels is 2×10^8 m / s × Δt.

[0080] According to the measured optical path differences of each beam, set the initial voltage values of each large-range delay line to make the fixed delays of each beam equal.

[0081] In one embodiment, as Figure 4As shown in the figure, it is a structural diagram of another laser communication terminal provided by an embodiment of the present application. Among them, the phased array antenna 103 includes a second high-speed phase shifter 401 corresponding to each emission optical path, a second optical delay line 402 communicatively connected to the second high-speed phase shifter 401, and a TR component 403;

[0082] The second high-speed phase shifter 401 is used to perform second phase difference delay compensation on the laser beam emitted by the optical module according to the second phase control parameter;

[0083] The second optical delay line 402 is used to perform second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter.

[0084] In a specific embodiment, the realization of delay compensation consists of two parts: the optical path difference delay compensation part, where the first optical delay line and / or the second optical delay line compensate for the fixed optical path difference and the large optical path difference generated by scanning; the phase difference delay compensation part, where the first high-speed phase shifter and / or the second high-speed phase shifter compensate for small phase shifts. The present application adopts a high-precision feedback closed-loop control scheme to control the phase of the local emission beam and the received beam respectively, so as to achieve consistent far-field phase of the emission beam.

[0085] It should be noted that, as Figure 5 shown in the figure, it is a schematic diagram of the sampling control optical path provided by an embodiment of the present application, taking a 4×4 pixel optical phased array with an aperture of 8 mm for each element, a spacing of 10 mm, and a scanning angle of 30° as an example. The seed source 303 outputs a laser beam to the modulator 305. After the communication data is driven by radio frequency, it is modulated by the modulator 305 to load the data signal. The modulated laser beam signal is output as the communication transmission signal, and then after passing through a 4×16 optical switch matrix, each branch includes a phase shifter 307 and a polarization controller 306. 16 fiber collimators 501 collimate the communication transmission signal into 16 spatial beams. In order to ensure the equal optical path of the 16 spatial beams, the 16 spatial beams are optically sampled by the sampling monitoring module 102, and then after passing through the Fourier transform lens 502, they are detected and received by the camera 503 at the rear focal plane to monitor the coherence of the 16 spatial beams and ensure the phase synchronization of the emission front end.

[0086] The 16 synchronized spatial beams are coupled into the optical fiber again through the fiber collimator 504, collimated into spatial beams again after passing through the 16-channel fiber phase shifter 504, optically sampled by the sampling monitoring module 102, and the spatial beams with consistent polarization phases are coupled into the optical fiber again through the fiber collimator 504. The phase of each channel is independently controlled by the fiber phase shifter in each path to ensure the phase synchronization between each pixel, and then connected to the receiving demodulation module to obtain the communication data.

[0087] For example, in one embodiment, the scanning angle is calculated as 30 degrees, the maximum distance between the centers of the array elements in the matrix side length direction is 30 mm, and the maximum time delay is:

[0088] ΔL=(x - x m )sinθ x (t)+(y - y m )sinθ y (t)

[0089] = 30sin30 + 30cos30 = 40.98 mm;

[0090] An optical delay line is used to compensate for the optical path difference delay, and the delay accuracy can reach 20 nm. The compensation range is the maximum delay amount that is an integer multiple of the phase within the effective length of the large-range delay line.

[0091] In another embodiment, the second optical delay line is specifically used for: using the stochastic gradient descent algorithm to perform second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter;

[0092] The first optical delay line is specifically used for: using the stochastic gradient descent algorithm to perform first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter.

[0093] In the embodiments of the present application, the specific steps of the stochastic gradient descent algorithm are as follows:

[0094] Step 1: ADC1 (Analog-to-Digital Converter 1) collects data, and the number of sampling times is N (N can be externally set) to obtain an average value Xp.

[0095] Step 2: Each DAC (Digital-to-Analog Converter) outputs an initial voltage begin_DV0 i (n). Delay T0. (n is the current loop count) (i = 1, 2, 3, 4... represents each path, a total of 16 paths);

[0096] It should be noted that the initial setting of the initial voltage begin_DV0 i (n) is the median of the voltage range, and the voltage range can be externally set; the range of the delay T0 is 1 ns - 1 s, including control signal transmission, DAC assignment, and hardware output; the voltage of the phase shifter needs to be set with two boundaries. When the output voltage in the next loop exceeds the preset voltage range or is less than 0 V, the voltage is directly set to the center position.

[0097] Step 3: Generate 16 random numbers as the perturbation voltages dv i (n) of the 16 DACs;

[0098] Among them, the perturbation voltage dv i(n) On the host computer, two methods for generating parameters need to be set: First, the size is fixed, adjustable, the positive and negative signs are random, and the probabilities are equal; Second, both the size and the positive and negative signs are random, following a Gaussian distribution, and the mean and variance can be set on the interface. In addition, the delay T range can be set, from 1 ns to 1 s; In the specific implementation, if the DAC output exceeds the range set by the host computer, that is, less than 0 or greater than the maximum voltage range, it is directly set to the median value of the range (i.e., reset); If multiple DACs trigger the boundary condition, they are sorted. First, the DAC with the largest value is reset, and the voltages of the other channels remain unchanged. After a time Tw, the second-largest DAC in the sorting is reset, and so on, until all the DACs that reach the boundary are reset.

[0099] Step 4: Invert the perturbation voltages of each path above, that is, begin_DV0 i (n) -dv i (n) -dw i (n), output by the DAC, with a delay T;

[0100] Among them, the range of the delay T can be set on the host computer, from 1 ns to 1 s; The negative perturbations of each path should be strictly consistent with the size in Step 2, with opposite signs and one-to-one correspondence; In the specific implementation, if the DAC output exceeds the range set by the host computer, that is, less than 0 or greater than the maximum voltage range, it is directly set to the median value of the range (i.e., reset); If multiple DACs trigger the boundary condition, they are sorted. First, the DAC with the largest value is reset, and the voltages of the other channels remain unchanged. After a time Tw, the second-largest DAC in the sorting is reset, and so on, until all the DACs that reach the boundary are reset.

[0101] Step 5: ADC1 collects data, with the number of sampling times being N (N can be externally set), and an average value X2 is obtained.

[0102] Step 6: The DAC sends two data, one is begin_DV0 i (n) +dv i (n) +dw i (n), and the other is begin_DV0 i (n) -dv i (n) -dw i (n), and the conditional judgment steps are as follows:

[0103] The sending order is (1) begin_DV0 i (n) +dv i (n) +dw i (n), (2) begin_DV0 i (n) -dv i (n) -dw i (n);

[0104] The current stop position is: begin_DV0 i (n)-dv i (n)-dw i (n);

[0105] Compare X1 and X2 (first-order perturbation), where X1 = begin_DV0 i (n)+dv i (n)+dw i (n), X2 = begin_DV0 i (n)-dv i (n)-dw i (n);

[0106] If X1 is the largest, then

[0107] begin_DV0 i (n + 1)=begin_DV0 i (n)+2dv i (n)+dw i (n)=x1

[0108] If X2 is the largest, then

[0109] begin_DV0 i (n + 1)=begin_DV0 i (n)-dv i (n)-dw i (n)=x2

[0110] Send begin_DV0 i (n + 1) through the DAC output, and send it to the phase shifter for execution through the drive. The delay duration is T;

[0111] Among them, the range of the delay T can be set by the host computer, which is 1ns - 1s; the conditional judgment is to take the maximum value from the two acquisition values, and set the voltage to the voltage of this time as the initial voltage for the next cycle.

[0112] Step 7, return to Step 1, and the compensation phases introduced by each fiber optic phase shifter ensure that the phases of the 16 optical signals are always consistent to achieve multi-beam pointing coherent beam combination.

[0113] Based on the same inventive concept, the embodiment of the present application also provides a delay compensation method. The principle of this delay compensation method is similar to that of the above laser communication terminal, and the repeated parts will not be elaborated.

[0114] As Figure 6 shown, it is a schematic flowchart of a delay compensation method provided by the embodiment of the present application, which specifically includes the following steps:

[0115] S601. Sample the laser beam through the sampling monitoring module to determine the optical path difference. If the laser beam is emitted by the optical module, determine the first delay control parameter and the first phase control parameter according to the optical path difference. If the laser beam is received by the phased array antenna, determine the second delay control parameter and the second phase control parameter according to the optical path difference.

[0116] S602. Perform first optical path difference delay compensation on the laser beam emitted by the optical module through the first optical delay line according to the first delay control parameter.

[0117] S603. Perform first phase difference delay compensation on the laser beam emitted by the optical module through the first high-speed phase shifter according to the first phase control parameter.

[0118] S604. Perform second optical path difference delay compensation and second phase difference compensation on the laser beam emitted by the optical module through the phased array antenna according to the second delay control parameter and the second phase control parameter.

[0119] In a possible implementation, if the laser beam is emitted by the optical module, the method includes:

[0120] Through the sampling monitoring module, according to the first preset relationship, use the delay control parameter corresponding to the integer value of the optical path difference as the first delay control parameter, and according to the second preset relationship, use the phase control parameter corresponding to the fractional value of the optical path difference as the first phase control parameter.

[0121] If the laser beam is received by the phased array antenna, the method includes:

[0122] Through the sampling monitoring module, according to the third preset relationship, use the delay control parameter corresponding to the integer value of the optical path difference as the second delay control parameter, and according to the fourth preset relationship, use the phase control parameter corresponding to the fractional value of the optical path difference as the second phase control parameter.

[0123] In a possible implementation, the phased array antenna includes a second high-speed phase shifter corresponding to each emission optical path, a second optical delay line connected to the second high-speed phase shifter, and a TR component.

[0124] Perform second phase difference delay compensation on the laser beam emitted by the optical module through the second high-speed phase shifter according to the second phase control parameter.

[0125] Perform second optical path difference delay compensation on the laser beam emitted by the optical module through the second optical delay line according to the second delay control parameter.

[0126] In a possible implementation, the method further includes:

[0127] By means of the second optical delay line, the random gradient descent algorithm is adopted to perform second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter.

[0128] In a possible implementation, the method further includes:

[0129] By means of the first optical delay line, the random gradient descent algorithm is adopted to perform first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter.

[0130] Based on the same inventive concept, an embodiment of the present application further provides a phased array laser terminal. The phased array laser terminal is similar to the above delay compensation device in principle, and the repeated parts will not be elaborated.

[0131] As Figure 7 shown, it is a schematic structural diagram of a phased array laser terminal provided by an embodiment of the present application. It can be seen from Figure 7 that the phased array laser terminal includes an optical module 71, an optical fiber splitter 72, and the delay compensation device 73 according to any one of the first aspects;

[0132] The optical module 71 is used for emitting laser light;

[0133] The optical fiber splitter 72 is used for splitting the laser light into multiple laser beams.

[0134] A delay compensation device, a delay compensation method, and a phased array laser terminal provided by the present application. The delay compensation device includes: a plurality of transmitting optical paths, a sampling and monitoring module, and a phased array antenna. For each transmitting optical path, the transmitting optical path includes a first optical delay line and a first high-speed phase shifter; the plurality of transmitting optical paths, the sampling and monitoring module, and the phased array antenna are sequentially communicatively connected; the sampling and monitoring module is configured to sample a laser beam to determine an optical path difference. If the laser beam is emitted by an optical module, a first delay control parameter and a first phase control parameter are determined according to the optical path difference. If the laser beam is received by the phased array antenna, a second delay control parameter and a second phase control parameter are determined according to the optical path difference; the first optical delay line is configured to perform a first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter; the first high-speed phase shifter is configured to perform a first phase difference delay compensation on the laser beam emitted by the optical module according to the first phase control parameter; the phased array antenna is configured to perform a second optical path difference delay compensation and a second phase difference compensation on the laser beam emitted by the optical module according to the second delay control parameter and the second phase control parameter. In the embodiment of the present application, the laser beam emitted by the optical module is delay compensated by the first optical delay line, the first high-speed phase shifter, and the phased array antenna, so as to achieve complete compensation of the laser beam, solve the problems of phase jump and wavelength dispersion in phased array communication, and improve the communication capacity.

[0135] The present application is described above with reference to the block diagrams and / or flowcharts showing methods, apparatuses (systems) and / or computer program products according to embodiments of the present application. It should be understood that one block of the block diagrams and / or flowcharts and combinations of blocks in the block diagrams and / or flowcharts can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, and / or other programmable data processing devices to produce a machine, such that the instructions executed via the computer processor and / or other programmable data processing devices create a method for implementing the functions / actions specified in the block diagrams and / or flowchart blocks.

[0136] Correspondingly, the present application can also be implemented by hardware and / or software (including firmware, resident software, microcode, etc.). Further, the present application can take the form of a computer program product on a computer-usable or computer-readable storage medium, which has computer-usable or computer-readable program code implemented in the medium for use by or in connection with an instruction execution system. In the context of the present application, a computer-usable or computer-readable medium can be any medium that can contain, store, communicate, transmit, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

[0137] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A delay compensation device, characterized in that, Including: A plurality of transmitting optical paths, a sampling and monitoring module, and a phased array antenna, wherein for each transmitting optical path, the transmitting optical path includes a first optical delay line and a first high-speed phase shifter; The plurality of transmitting optical paths, the sampling and monitoring module, and the phased array antenna are communicatively connected in sequence; The sampling and monitoring module is configured to sample a laser beam to determine an optical path difference. If the laser beam is emitted by an optical module, a first delay control parameter and a first phase control parameter are determined according to the optical path difference. If the laser beam is received by the phased array antenna, a second delay control parameter and a second phase control parameter are determined according to the optical path difference; The first optical delay line is configured to perform a first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter; The first high-speed phase shifter is configured to perform a first phase difference delay compensation on the laser beam emitted by the optical module according to the first phase control parameter; The phased array antenna is configured to perform a second optical path difference delay compensation and a second phase difference compensation on the laser beam emitted by the optical module according to the second delay control parameter and the second phase control parameter.

2. The device according to claim 1, characterized in that, If the laser beam is emitted by the optical module, the sampling and monitoring module is specifically configured to: According to a first preset relationship, use the delay control parameter corresponding to the integer value of the optical path difference as the first delay control parameter, and according to a second preset relationship, use the phase control parameter corresponding to the fractional value of the optical path difference as the first phase control parameter; If the laser beam is received by the phased array antenna, the sampling and monitoring module is specifically configured to: According to a third preset relationship, use the delay control parameter corresponding to the integer value of the optical path difference as the second delay control parameter, and according to a fourth preset relationship, use the phase control parameter corresponding to the fractional value of the optical path difference as the second phase control parameter.

3. The device according to claim 1, characterized in that The phased array antenna includes a second high-speed phase shifter corresponding to each transmitting optical path, a second optical delay line connected to the second high-speed phase shifter, and a TR component; The second high-speed phase shifter is configured to perform a second phase difference delay compensation on the laser beam emitted by the optical module according to the second phase control parameter; The second optical delay line is configured to perform a second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter.

4. The device according to claim 3, wherein The second optical delay line is specifically configured to: Adopt a stochastic gradient descent algorithm to perform a second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter.

5. The device according to any one of claims 1 to 4, characterized in that The first optical delay line is specifically configured to: Adopt a stochastic gradient descent algorithm to perform a first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter.

6. A phased array laser terminal, characterized in that, Including an optical module, an optical fiber splitter, and a delay compensation device according to any one of claims 1 to 5; The optical module is configured to emit a laser; The optical fiber splitter is configured to divide the laser into multiple laser beams.

7. A delay compensation method, characterized in that, Applied to the delay compensation device as described in any one of claims 1 to 5, or the phased array laser terminal as described in claim 6, the method includes: Through a sampling monitoring module, sampling the laser beam to determine the optical path difference. If the laser beam is emitted by the optical module, determining a first delay control parameter and a first phase control parameter according to the optical path difference. If the laser beam is received by the phased array antenna, determining a second delay control parameter and a second phase control parameter according to the optical path difference; Through a first optical delay line, performing a first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter; Through a first high-speed phase shifter, performing a first phase difference delay compensation on the laser beam emitted by the optical module according to the first phase control parameter; Through the phased array antenna, performing a second optical path difference delay compensation and a second phase difference compensation on the laser beam emitted by the optical module according to the second delay control parameter and the second phase control parameter.

8. The method according to claim 7, wherein If the laser beam is emitted by the optical module, the method includes: Through the sampling monitoring module, according to a first preset relationship, taking the delay control parameter corresponding to the integer value of the optical path difference as the first delay control parameter, and according to a second preset relationship, taking the phase control parameter corresponding to the fractional value of the optical path difference as the first phase control parameter; If the laser beam is received by the phased array antenna, the method includes: Through the sampling monitoring module, according to a third preset relationship, taking the delay control parameter corresponding to the integer value of the optical path difference as the second delay control parameter, and according to a fourth preset relationship, taking the phase control parameter corresponding to the fractional value of the optical path difference as the second phase control parameter.

9. The method according to claim 7, wherein The phased array antenna includes a second high-speed phase shifter corresponding to each transmitting optical path, a second optical delay line connected to the second high-speed phase shifter, and a TR component; Through the second high-speed phase shifter, performing a second phase difference delay compensation on the laser beam emitted by the optical module according to the second phase control parameter; Through the second optical delay line, performing a second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter.

10. The method according to claim 9, wherein The method further includes: Through the second optical delay line, using the stochastic gradient descent algorithm, performing a second optical path difference delay compensation on the laser beam emitted by the optical module according to the second delay control parameter.

11. The method according to any one of claims 7 to 10, characterized in that, The method further includes: Through the first optical delay line, using the stochastic gradient descent algorithm, performing a first optical path difference delay compensation on the laser beam emitted by the optical module according to the first delay control parameter.

Images