A laser phased array multi-target emission method based on pulse beacon light

Abstract

This invention discloses a multi-target emission method for laser phased arrays based on pulsed beacon light, belonging to the field of lasers and beam phased arrays. The method includes the following steps: first, dividing the emitting end face of the laser phased array into several sub-arrays according to the total number of detected targets; then coupling the beacon light into each sub-beam; and finally determining the position (xi) of the i-th target. i ,y i Then, control the p-th beacon light output of the i-th subarray to detect the position of the beacon light spot (u). ip ,v ip Next, adjust the direction of the p-th sub-beam of the i-th subarray to make the beacon beam position (u) ip ,v ip ) coincides with the target location (x i ,y i Finally, an optimization algorithm is used to control the phase co-phase of sub-beams within the i-th subarray. The method of this invention enables a laser phased array system to simultaneously emit lasers at multiple targets, improving the system's application efficiency.

Description

Technical Field

[0001] This invention relates to the fields of lasers and beam phased arrays, and more specifically, to a method for multi-target emission from a laser phased array based on pulsed beacon light. Background Technology

[0002] Laser phased array systems utilize coherent combining technology to simultaneously output multiple laser beams. By adjusting the direction and phase of each beam, a combined beam is ensured at the target location. This technology has broad application prospects in fields such as laser atmospheric transmission, optoelectronic countermeasures, and lidar. Based on practical application requirements, a laser phased array system capable of firing at multiple targets is needed. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-target emission method for laser phased array based on pulsed beacon light. The laser phased array emission is divided into several sub-arrays according to the total number of targets. Each sub-beam is coupled with a pulsed beacon light. The sub-arrays and their sub-beams are distinguished by the different emission timing of the beacon light. Each sub-array will emit a composite beam for different targets, realizing the emission of a single laser phased array system for multiple targets and improving the efficiency of practical applications.

[0004] The objective of this invention is achieved through the following solution:

[0005] A multi-target emission method for laser phased arrays based on pulsed beacon light includes:

[0006] Step 1: Divide the laser phased array transmitter into M subarrays according to the total number of targets M;

[0007] Step 2: Couple the pulsed beacon light into each sub-beam;

[0008] Step 3, determine the location (x) of the i-th target. i ,y i ), i = 1, 2, 3, ... M;

[0009] Step 4: Control the p-th beacon light output of the i-th subarray and detect the position of the beacon light spot (u). ip ,v ip );

[0010] Step 5, adjust the direction of the p-th sub-beam of the i-th subarray so that the position of the beacon beam spot (u) ip ,v ip ) coincides with the target location (x i ,y i );

[0011] Step 6: Use an optimization algorithm to control the phase co-phase of each sub-beam within the i-th subarray.

[0012] Furthermore, after step 6, the process includes step 7, which repeats steps 3 through 6.

[0013] Furthermore, in step 1, the total number of targets is determined using an image recognition algorithm, and an adaptive fiber optic collimator is built into the transmitter. Different subarrays are formed by selecting the number and position of the adaptive fiber optic collimator.

[0014] Furthermore, in step 2, the pulsed beacon light is coupled into the optical fiber that transmits the main laser sub-beam through an optical fiber combiner, and the wavelengths of the beacon light and the main laser are different.

[0015] Furthermore, in step 3, the target location is determined by an image processing algorithm or specified manually.

[0016] Furthermore, in step 4, the timing of the beacon light emission is controlled by a signal processor.

[0017] Furthermore, in step 5, with (x i ,y i )=(u ip ,v ip With the target as the objective, the beam direction is adjusted by controlling the deflection direction of the adaptive fiber collimator.

[0018] Furthermore, in step 6, the optimization algorithm includes stochastic parallel gradient descent and single-jitter method.

[0019] Furthermore, in step 4, the beacon light spot position (u) ip ,v ip It is obtained by photoelectric detection system.

[0020] Furthermore, in step 6, the signal processor controls the phase modulator to send a phase control signal to make the sub-beams in each subarray be in phase.

[0021] The beneficial effects of this invention include:

[0022] This invention divides a laser phased array into several subarrays based on the total number of targets. Sub-beams within a subarray are coupled with pulsed beacon beams. By using the different emission timing of the beacon beams to mark each sub-beam, the emission direction of each subarray beam is controlled, ensuring that the emitted light from each subarray acts on the corresponding target position. This achieves high power output while ensuring the synchronous and precise emission of multiple targets, thus improving the system's application efficiency.

[0023] This invention controls sub-beams coupled with pulsed beacon light to emit light in different time sequences based on the principle of time division multiplexing, distinguishing all sub-beams for detection, thereby precisely controlling the position of each sub-array emitted beam and realizing precise synchronous emission of a single laser phased array system to multiple targets. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the method flow of an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the system structure according to an embodiment of the present invention;

[0027] In the figure, 1 is the first pulse beacon light array, 2 is the second pulse beacon light array, 3 is the third pulse beacon light array, 4 is the first main laser array, 5 is the second main laser array, 6 is the third main laser array, 7 is the first phase modulator array, 8 is the second phase modulator array, 9 is the third phase modulator array, 10 is the first adaptive fiber collimator array, 11 is the second adaptive fiber collimator array, 12 is the third adaptive fiber collimator array, 13 is the signal processor, 14 is the photoelectric detection system, 15 is the first target, 16 is the second target, and 17 is the third target.

[0028] Figure 3 This is a timing diagram for an embodiment of the present invention. Detailed Implementation

[0029] All features disclosed in all embodiments of this specification, or steps in all methods or processes implied in the disclosure, may be combined and / or extended or replaced in any way, except for mutually exclusive features and / or steps.

[0030] like Figure 1 As shown, a multi-target emission method for laser phased arrays based on pulsed beacon light includes the following steps:

[0031] Step 1: Divide the laser phased array transmitter into M subarrays according to the total number of targets M;

[0032] Step 2: Couple the pulsed beacon light into the sub-beam;

[0033] Step 3, determine the location (x) of the i-th target. i ,y i ), i = 1, 2, 3, ... M;

[0034] Step 4: Control the p-th beacon light output of the i-th subarray and detect the position of the beacon light spot (u). ip ,v ip );

[0035] Step 5, adjust the direction of the p-th sub-beam of the i-th subarray so that the position of the beacon beam spot (u) ip ,v ip ) coincides with the target location (x i ,y i );

[0036] Step 6: Use an optimization algorithm to control the phase co-phase of each sub-beam within the i-th subarray.

[0037] In an optional implementation, it includes:

[0038] Step 7: Repeat steps 3 through 6.

[0039] In an optional implementation, in step 1, the total number of targets is determined using an image recognition algorithm, and an adaptive fiber optic collimator is built into the transmitter. Different subarrays are formed by selecting the number and position of the adaptive fiber optic collimator.

[0040] In an optional implementation, in step 2, the pulsed beacon light is coupled into the optical fiber of the transmission sub-beam via an optical fiber combiner.

[0041] In an optional implementation, in step 3, the target location can be determined by an image processing algorithm or manually specified.

[0042] In an optional implementation, in step 4, the timing of the beacon light emission can be controlled by a signal processor; the beacon light spot position (u ip ,v ip It is obtained by photoelectric detection system.

[0043] In an optional implementation, in step 5, with (x i ,y i )=(u ip ,v ip With the target as the objective, the beam direction is adjusted by controlling the deflection direction of the adaptive fiber collimator.

[0044] In an optional implementation, in step 6, the optimization algorithm can be a stochastic parallel gradient descent method, a single dithering method, etc. The signal processor controls the phase modulator to send a phase control signal so that the sub-beams in each subarray are in phase.

[0045] In other embodiments of the invention, such as Figure 2As shown, it is a schematic diagram of the system structure of an embodiment of the present invention. There are 3 targets (M=3). The laser phased array contains 9 sub-beams, divided into 3 sub-arrays, each with 3 sub-beams. Specifically, it is equipped with a first pulse beacon array 1, a second pulse beacon array 2, a third pulse beacon array 3, a first main laser array 4, a second main laser array 5, a third main laser array 6, a first phase modulator array 7, a second phase modulator array 8, a third phase modulator array 9, a first adaptive fiber collimator array 10, a second adaptive fiber collimator array 11, a third adaptive fiber collimator array 12, a signal processor 13, a photoelectric detection system 14, a first target 15, a second target 16, and a third target 17. In this embodiment, the main laser is a continuous light with a wavelength of 532nm, and each beacon light is a pulsed light with a repetition frequency of 1000Hz and a wavelength of 808nm; the operating frequency of each adaptive fiber optic collimator is 1000Hz; the photoelectric detection system consists of optical elements and a CCD camera, used to detect the position information of the beacon light and the light intensity information of the main laser, with a sampling frequency of 11000Hz; the signal processor is loaded with a stochastic parallel gradient descent algorithm as the optimization algorithm for controlling the phase, and the frequencies of its forward and reverse perturbation voltages are both 1000Hz; the signal processor uses a computer based on the Linux operating system, with a processing frequency of 11000Hz; all three targets are cross-shaped target plates. In this embodiment of the invention, the laser phased array is divided into three subarrays, each containing three subbeams. Each subbeam is coupled with a pulsed beacon beam. The signal processor sends a trigger emission signal with a repetition frequency of 9000Hz. The nine beacon beams emit light in different timing sequences, thereby effectively distinguishing each subbeam. By adjusting the direction of the subbeams, the emitted light from each subarray is directed to the corresponding target position, enabling a single laser phased array system to emit light to multiple targets and improving application efficiency.

[0046] like Figure 3 The diagram shown is a system timing diagram of an embodiment of the present invention. A 1 indicates that the signal processor is sending a trigger signal to emit light, and a 0 indicates that no signal is being sent. A 1 indicates that the i-th beacon light is emitting light, and a 0 indicates that no light is being emitted. A 1 indicates that the CCD detects the beacon light spot information, and a 0 indicates that it does not detect it. A 1 indicates that the adaptive fiber collimator is operating, and a 0 indicates that it is not operating. A 1 indicates that the CCD detects the main laser spot information, and a 0 indicates that it does not detect it. A 1 indicates that the signal processor with the SPGD algorithm is outputting a positive perturbation voltage, and a 0 indicates that it is not outputting a positive perturbation voltage. A 1 indicates that the signal processor with the SPGD algorithm is outputting a reverse perturbation voltage, and a 0 indicates that it is not outputting a reverse perturbation voltage.

[0047] It should be noted that, within the scope of protection defined in the claims of this invention, the following embodiments can be combined and / or extended or replaced in any logical manner from the above specific embodiments, such as the disclosed technical principles, disclosed technical features or implicitly disclosed technical features.

[0048] Example 1

[0049] A multi-target emission method for laser phased arrays based on pulsed beacon light includes:

[0050] Step 1: Divide the laser phased array transmitter into M subarrays according to the total number of targets M;

[0051] Step 2: Couple the pulsed beacon light into each sub-beam;

[0052] Step 3, determine the location (x) of the i-th target. i ,y i ), i = 1, 2, 3, ... M;

[0053] Step 4: Control the p-th beacon light output of the i-th subarray and detect the position of the beacon light spot (u). ip ,v ip );

[0054] Step 5, adjust the direction of the p-th sub-beam of the i-th subarray so that the position of the beacon beam spot (u) ip ,v ip ) coincides with the target location (x i ,y i );

[0055] Step 6: Use an optimization algorithm to control the phase co-phase of each sub-beam within the i-th subarray.

[0056] Example 2

[0057] Based on Example 1, after step 6, the method further includes: step 7, repeating steps 3 to 6.

[0058] Example 3

[0059] Based on Example 1, in step 1, the total number of targets is determined using an image recognition algorithm. The transmitter has an adaptive fiber optic collimator built in, and different subarrays are formed by selecting the number and position of the adaptive fiber optic collimator.

[0060] Example 4

[0061] Based on Example 1, in step 2, the pulsed beacon light is coupled into the optical fiber that transmits the main laser sub-beam through an optical fiber combiner, and the wavelengths of the beacon light and the main laser are different.

[0062] Example 5

[0063] Based on Example 1, in step 3, the target location is determined by an image processing algorithm or manually specified.

[0064] Example 6

[0065] Based on Example 1, in step 4, the timing of the beacon light emission is controlled by a signal processor.

[0066] Example 7

[0067] Based on Example 1, in step 5, with (x i ,y i )=(u ip ,v ip With the target as the objective, the beam direction is adjusted by controlling the deflection direction of the adaptive fiber collimator.

[0068] Example 8

[0069] Based on Example 1, in step 6, the optimization algorithm includes stochastic parallel gradient descent and single-jitter method.

[0070] Example 9

[0071] Based on Example 6, in step 4, the beacon light spot position (u) ip ,v ip It is obtained by photoelectric detection system.

[0072] Example 10

[0073] Based on Example 8, in step 6, the signal processor controls the phase modulator to send a phase control signal so that the sub-beams in each subarray are in phase.

[0074] The units described in the embodiments of the present invention can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0075] According to one aspect of the present invention, a computer program product or computer program is provided, the computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and executes the computer instructions, causing the computer device to perform the methods provided in the various optional implementations described above.

[0076] In another aspect, embodiments of the present invention also provide a computer-readable medium, which may be included in the electronic device described in the above embodiments; or it may exist independently and not assembled into the electronic device. The computer-readable medium carries one or more programs, which, when executed by the electronic device, cause the electronic device to perform the methods described in the above embodiments.

Claims

1. A method for multi-target emission from a laser phased array based on pulsed beacon light, characterized in that, include: Step 1: Divide the laser phased array transmitter into M subarrays according to the total number of targets M; Step 2: Couple the pulsed beacon light into each sub-beam; Step 3, determine the location (x) of the i-th target. i , y i ), i = 1,2,3,...M; Step 4: Control the p-th beacon light output of the i-th subarray and detect the position of the beacon light spot (u ip , v ip ); Step 5, adjust the direction of the p-th sub-beam of the i-th subarray so that the position of the beacon beam spot (u) ip , v ip ) coincides with the target location (x i , y i ); Step 6: Use an optimization algorithm to control the phase co-phase of each sub-beam within the i-th subarray; In step 1, the total number of targets is determined using an image recognition algorithm. The transmitter has an adaptive fiber optic collimator built in, and different subarrays are formed by selecting the number and position of the adaptive fiber optic collimator. In step 4, the timing of the beacon light output is controlled by a signal processor; In step 5, with (x i , y i ) = (u ip , v ip With the target as the objective, the beam direction is adjusted by controlling the deflection direction of the adaptive fiber collimator.

2. The laser phased array multi-target emission method based on pulsed beacon light according to claim 1, characterized in that, After step 6, the process also includes step 7, which repeats steps 3 through 6.

3. The method for multi-target emission of laser phased array based on pulsed beacon light according to claim 1, characterized in that, In step 2, the pulsed beacon light is coupled into the optical fiber that transmits the main laser sub-beam through an optical fiber combiner. The wavelengths of the beacon light and the main laser are different.

4. The laser phased array multi-target emission method based on pulsed beacon light according to claim 1, characterized in that, In step 3, the target location is determined by an image processing algorithm or manually specified.

5. The method for multi-target emission of laser phased array based on pulsed beacon light according to claim 1, characterized in that, In step 6, the optimization algorithm includes stochastic parallel gradient descent and single-jitter method.

6. The method for multi-target emission of laser phased array based on pulsed beacon light according to claim 1, characterized in that, In step 4, the beacon light spot position (u) ip , v ip (This information is obtained through a photoelectric detection system.) 7. The laser phased array multi-target emission method based on pulsed beacon light according to claim 5, characterized in that, In step 6, the signal processor controls the phase modulator to send a phase control signal to make the sub-beams in each subarray be in phase.

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