A laser semi-active seeker testing system and method

Abstract

The application discloses a kind of laser semi-active seeker testing system and method, system includes: optical platform, laser target simulation unit, seeker fixed seat, three-axis turntable and stepper motor etc.Modular.The laser target simulation unit is used to simulate the real echo signal generated after laser irradiation to target;The seeker fixed seat is installed on three-axis turntable, three-axis turntable is installed on optical platform and is driven by stepper motor.Laser target simulation unit, laser semi-active seeker and stepper motor are respectively connected with host computer communication.The application is applicable to miniature laser semi-active seeker, and can test the working distance, field angle, responsivity and multiple performance parameters of miniature laser semi-active seeker synchronously.

Description

Technical Field

[0001] This invention belongs to the field of laser guidance technology, specifically relating to a laser semi-active seeker testing system and method. Background Technology

[0002] Laser semi-active guidance technology boasts advantages such as high guidance accuracy, strong anti-interference capability, simple structure, and low cost, and is currently widely used in various weapon and equipment platforms. The laser seeker, a key component of this technology, receives the diffuse reflection echo of the laser beam striking the target via its front-end optical system, forming a light spot of a specific size on the detector target surface. By calculating the center position of the laser spot on the detector target surface, the seeker's offset relative to the target is determined, thus establishing the guidance loop.

[0003] Typically, to ensure the reliability of a laser seeker, its various performance parameters need to be tested. The test results determine whether the laser seeker meets the performance requirements of the entire guided bullet system, ensuring the overall system performance. In recent years, research on laser semi-active guidance technology in my country has gradually increased; however, research on how to miniaturize this technology and apply it to extremely small spaces such as bullets is limited, and corresponding miniature seeker testing schemes are also scarce. Currently, most seeker testing systems on the market are applied to large launch platforms and primarily test single parameters. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a laser semi-active seeker testing system and method. This system and method are applicable to miniature laser semi-active seekers and can simultaneously test multiple performance parameters of miniature laser semi-active seekers.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, a laser semi-active seeker testing system is provided, comprising: a laser target simulation unit mounted on an optical platform for simulating the echo signal generated after a laser irradiates a target; a seeker mounting base for mounting the laser semi-active seeker, the seeker mounting base being mounted on a three-axis rotary table; the three-axis rotary table being mounted on the optical platform and driven by a stepper motor mounted on the optical platform; the laser semi-active seeker for receiving the echo signal; and the laser target simulation unit, the laser semi-active seeker, and the stepper motor being communicatively connected to a host computer.

[0007] Furthermore, the laser target simulation unit includes a dark box and a projection system; a laser is installed inside the dark box, and the laser emitted by the laser is collimated into parallel light by a collimating lens. The parallel light is expanded by an electronic beam expander, and then reflected by a galvanometer to an attenuating lens and a projection system, thereby generating an echo signal simulating real conditions; wherein, the beam expander is used to adjust the change in the size of the laser spot; the galvanometer is used to simulate the change in the laser incident angle; and the attenuating lens and projection system are used to simulate the interference encountered by the laser when it is transmitted in an atmospheric environment.

[0008] Furthermore, the laser is a pulsed laser, which outputs laser light with a wavelength of 1064nm.

[0009] Furthermore, the parameters of the pulsed laser, electronic beam expander, and galvanometer can be configured via a host computer.

[0010] The second aspect provides a laser semi-active seeker testing method, which uses the laser semi-active seeker testing system described in the first aspect to perform performance testing on the laser semi-active seeker.

[0011] Furthermore, the performance test includes testing the working distance of the laser semi-active seeker, specifically: mounting the laser semi-active seeker on a three-axis turntable using a seeker mounting bracket, connecting the output of the laser semi-active seeker to an oscilloscope; turning on the test system and performing calibration; calibrating the equivalent optical power at different working distances, using the following calculation formula:

[0012] P in =P out ×α1×η×α2 / (π×L 2 )

[0013] Among them, P in For equivalent optical power, P out Let α1 be the atmospheric attenuation coefficient from the laser to the target irradiation point, η be the diffuse reflectivity of the target, L be the distance between the seeker and the target reflection point, and α2 be the atmospheric attenuation coefficient from the target reflection point to the seeker. Adjust the incident laser according to the set attenuation amplitude and measure the amplitude of the echo signal at this time. When the measured echo signal amplitude is equal to the preset value, remove the seeker and install an optical power meter in the same position, and record the reading of the optical power meter, which is the equivalent optical power at this time. Calculate the working distance corresponding to the equivalent optical power on the host computer, which is the maximum working distance of the laser semi-active seeker.

[0014] Furthermore, the performance test includes testing the field of view of the laser semi-active seeker. Specifically, the laser semi-active seeker is mounted on a three-axis turntable using a seeker mounting bracket, the test system is turned on and calibrated; the laser semi-active seeker is adjusted to its initial position, at which point the center of the laser semi-active seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the laser semi-active seeker are equal; the laser semi-active seeker is controlled to rotate from its initial position to both sides using the three-axis turntable, rotating the three-axis turntable according to a set step size, and the output signal amplitude of the seeker is measured; the angle between the laser semi-active seeker and the optical axis is continuously increased, and when the output signal on one side of the seeker is just lost, the host computer measures the deflection angle at this time, which is the field of view of the seeker.

[0015] Furthermore, the performance test includes testing the azimuth response of the laser semi-active seeker, specifically: the laser semi-active seeker is mounted on a three-axis turntable using a seeker mount, the test system is turned on and calibrated; the laser semi-active seeker is adjusted to its initial position, at which point the center of the laser semi-active seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the laser semi-active seeker are equal; the laser semi-active seeker is controlled to deflect from the center in a set direction using the three-axis turntable, so that the incident light spot is only distributed in the first quadrant of the laser semi-active seeker, and the output signal amplitude of each channel is measured; similarly, the output signal amplitudes of each channel of the laser semi-active seeker are measured sequentially when the incident light spot is only distributed in the second, third, and fourth quadrants of the laser semi-active seeker.

[0016] Furthermore, the performance test includes testing the responsivity of the laser semi-active seeker, specifically: mounting the laser semi-active seeker on a three-axis turntable using a seeker mount, turning on the test system and calibrating it; adjusting the laser semi-active seeker to its initial position, at which point the center of the laser semi-active seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the laser semi-active seeker are equal; measuring the output voltage V of the four channels of the laser semi-active seeker. P Remove the laser semi-active seeker and measure the incident light power P using an optical power meter at the same location. in The data is then uploaded to the host computer. Similarly, by adjusting the attenuator to change the incident light power, multiple samples are taken within the output voltage range of the laser semi-active seeker according to the set sampling frequency, and the data is uploaded to the host computer. In the host computer, the incident light power is plotted on the horizontal axis and the output voltage is plotted on the vertical axis. The response curve is fitted using the least squares method, and its slope is the responsivity.

[0017] Furthermore, the performance test includes testing the four-channel output inconsistency of the laser semi-active seeker. Specifically, the laser semi-active seeker is mounted on a three-axis turntable using a seeker mount, the test system is turned on and calibrated; the laser semi-active seeker is adjusted to its initial position, at which point the center of the laser semi-active seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the laser semi-active seeker are equal; the laser beam expander generates a uniform spot, covering the entire photosensitive surface of the laser semi-active seeker; based on the measured responsivity R in the four quadrants... e 1. R e 2. R e 3. R e 4. Calculate the mean R of the responsiveness. e :

[0018]

[0019] Calculate the standard deviation R of the four-channel responsivity e rms:

[0020]

[0021] The inconsistency in the four-channel output of the laser semi-active seeker is as follows:

[0022]

[0023] Similarly, by rotating the laser semi-active seeker by a set angle, the inconsistency of the four-channel output of the laser semi-active seeker was measured again, and several sets of data were obtained. The average value was then calculated.

[0024]

[0025] Where d is the average value of the four-channel output inconsistency of the laser semi-active seeker.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention simulates the echo signal generated after laser irradiation of a target by a laser target simulation unit mounted on an optical platform; the laser semi-active seeker is mounted on a seeker mounting base, which is mounted on a three-axis rotary table; the three-axis rotary table is mounted on the optical platform and driven by a stepper motor mounted on the optical platform; the laser semi-active seeker is used to receive the echo signal; the laser target simulation unit, the laser semi-active seeker, and the stepper motor are respectively connected to a host computer for communication, which is suitable for testing miniature laser semi-active seekers and can simultaneously test multiple performance parameters of miniature laser semi-active seekers. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a laser semi-active seeker testing system provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram illustrating the working principle of a laser semi-active seeker testing system provided in an embodiment of the present invention;

[0029] Figure 3 This is the communication and control module interface of the host computer in this embodiment of the invention;

[0030] Figure 4 This is the interface for calculating the response and inconsistency parameters of the host computer in this embodiment of the invention;

[0031] Figure 1 The components are: 1. Dark box; 2. Projection system; 3. Guide head mounting base; 4. Three-axis turntable; 5. Signal interface; 6. Stepper motor; 7. Optical platform. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0033] like Figure 1 , Figure 2 As shown, a laser semi-active seeker testing system is used to perform performance tests on multiple indicators of a miniature laser semi-active seeker. It comprises a laser target simulation unit mounted on an optical platform 7, a seeker mounting base 3 for mounting the laser semi-active seeker (hereinafter referred to as the seeker), a three-axis turntable 4, a programmable constant voltage source, measuring instruments (voltmeter, ammeter, optical power meter, etc.), a stepper motor 6, and a host computer, among other components.

[0034] The laser target simulation unit is used to simulate the echo signal generated after a laser beam strikes a target. The seeker head mounting base 3 is mounted on a three-axis turntable 4; the three-axis turntable 4 is mounted on an optical platform 7 and driven by a stepper motor 6 mounted on the optical platform 7; the laser semi-active seeker head is used to receive the echo signal. The laser target simulation unit, the laser semi-active seeker head, and the stepper motor 6 are all communicatively connected to a host computer.

[0035] The laser target simulation unit includes a dark box 1 and a projection system 2. The dark box contains optical components such as a pulsed laser, collimating lens, beam expander, galvanometer, and attenuating lens.

[0036] A pulsed laser outputs a 1064nm wavelength laser beam. The laser beam is collimated into parallel light by a collimating lens, then expanded by an electrically operated zoom beam expander, and finally reflected by a galvanometer to an attenuating lens and projection system 2. This generates an echo signal simulating real-world conditions—the echo signal produced after the laser illuminates the target—which ultimately illuminates the seeker under test. The beam expander is used to adjust the size of the laser spot. The galvanometer is used to simulate changes in the laser's incident angle; the attenuating lens and projection system 2 are used to simulate interference encountered by the laser during transmission in an atmospheric environment.

[0037] During testing, the seeker head is fixed on a three-axis turntable 4, and the center of the seeker head is aligned with the optical axis by adjusting the turntable 4 via a host computer. The pulsed laser outputs a 1064nm wavelength laser, and the repetition rate and intensity of the laser can be adjusted via the host computer. The laser output from the pulsed laser is transmitted via optical fiber to a collimating lens inside a dark chamber, where the light is collimated into parallel light. The parallel light is then expanded by an electrically operated zoom beam expander, and reflected by a galvanometer to an attenuating lens and projection system, generating an echo laser simulating real-world conditions. The beam expander is used to adjust the size of the laser spot; the galvanometer is used to simulate changes in the laser's incident angle; and the attenuating lens and projection system are used to simulate interference encountered by the laser during transmission in an atmospheric environment.

[0038] The specific workflow is as follows: Figure 2 As shown. During the measurement process, the three-axis rotary table 4 is connected to the stepper motor 6, and then to the host computer via the signal interface 5. The stepper motor 6 is connected to the host computer via a serial port and moves precisely under the control of the host computer's communication and control module. The output signals generated by the optical power meter probe and the seeker are transmitted to the corresponding test source meter, and then transmitted to the data acquisition card and computer via the serial port to complete data acquisition. The control interface is shown below. Figure 3 As shown, the host computer communicates with the stepper motor 6 via a serial port, and can display the relative position of the current deflection of the three-axis turntable 4 while sending movement commands. The output signal of the guide head is led out through the signal interface 5 and connected to the measurement source meter, and then the measured data is transmitted to the host computer for processing. Figure 4 This is the test interface for seeker responsiveness and inconsistency, used to plot responsiveness curves and calculate parameters.

[0039] This invention also provides a laser semi-active seeker testing method, which uses the aforementioned laser semi-active seeker testing system to perform performance testing on the laser semi-active seeker.

[0040] Test method for seeker working distance:

[0041] In actual operation, the laser signal emitted by the laser travels through the atmosphere to the target surface, where it undergoes diffuse reflection and is then received by the seeker. The distance between the seeker and the target point can be calculated using parameters such as the laser output power, atmospheric attenuation coefficient, target diffuse reflectivity, and the incident light power received by the seeker. During testing, under specified operating conditions, different incident light powers are simulated using a laser target simulator, and the amplitude of the echo signal output by the seeker is measured. When the echo signal amplitude attenuates to a preset value, the equivalent optical power at this point corresponds to the maximum working distance.

[0042] The specific test steps for the seeker's working distance are as follows:

[0043] 1) Install the seeker onto the three-axis turntable of the hardware-in-the-loop system, and connect the seeker output to an oscilloscope.

[0044] Turn on the test system and calibrate it;

[0045] 2) The equivalent optical power at different working distances is calibrated using the following formula:

[0046] P in =P out ×α1×η×α2 / (π×L 2 )

[0047] Among them, P in For equivalent optical power, P out α1 is the atmospheric attenuation coefficient from the laser to the target illumination point, η is the diffuse reflectivity of the target, L is the distance between the seeker and the target reflection point, and α2 is the atmospheric attenuation coefficient from the target reflection point to the seeker.

[0048] 3) Adjust the incident laser by attenuating it by 1% each time, and measure the amplitude of the echo signal at this time;

[0049] 4) When the measured echo signal amplitude is equal to the preset value, remove the guide head and install an optical power meter in the same position, and record the reading of the optical power meter, which is the equivalent optical power at this time.

[0050] 5) Calculate the working distance corresponding to the equivalent optical power on the host computer, that is, the maximum working distance of the seeker;

[0051] 6) Shut down the test system.

[0052] Test method for seeker field of view:

[0053] Adjust the laser to align with the seeker head, ensuring that the amplitudes of the four output signals from the seeker head are equal. At this point, the seeker head is in its initial position. Starting from the initial position, control the three-axis turntable on the hardware-in-the-loop system to rotate the seeker head to the left and right in steps. As the angle between the seeker head and the optical axis increases, the maximum field of view is reached when the output signal is just lost. Measure and record the deflection angle α at this point.

[0054] The specific testing steps for the seeker's field of view are as follows:

[0055] 1) Install the seeker onto the three-axis rotary table of the hardware-in-the-loop simulation system. Turn on the test system and calibrate it;

[0056] 2) Adjust the seeker to the initial position. At this time, the center of the seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the seeker are equal.

[0057] 3) Control the seeker head to rotate from the initial position to both sides using a three-axis turntable. The step size of each turntable rotation is 0.1°, and measure the amplitude of the seeker head's output signal.

[0058] 4) Adjust the angle between the seeker head and the optical axis to continuously increase. When the output signal on one side of the seeker head is just lost, the host computer measures the deflection angle α at this time, which is the field of view angle of the seeker head.

[0059] 5) Shut down the test system.

[0060] Test method for seeker azimuth response:

[0061] The orientation response refers to the output of the four channels of the seeker under laser echo signals from different directions, reflecting the orientation information of the echo signal. During testing, the seeker is adjusted to its initial position, and the three-axis turntable on the hardware-in-the-loop simulation system is controlled to distribute the laser spot formed by the incident laser into four different quadrants of the seeker. The output signal of each channel of the seeker is measured at this time and uploaded to the host computer.

[0062] The specific test steps for the seeker's azimuth response are as follows:

[0063] 1) Install the seeker onto the three-axis turntable of the hardware-in-the-loop simulation system, turn on the test system and calibrate it;

[0064] 2) Adjust the seeker to the initial position. At this time, the center of the seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the seeker are equal.

[0065] 3) Control the seeker head to deflect from the center at a 45° angle using a three-axis turntable, so that the incident light spot is only distributed in the first quadrant of the seeker head, and measure the output signal amplitude of each channel; determine whether only the output channel corresponding to the quadrant where the light spot is located has a signal;

[0066] 4) Repeat step 3) and measure the output signal amplitude of each channel of the seeker when the light spot is distributed in the second, third and fourth quadrants in turn;

[0067] 5) Shut down the test system.

[0068] Test method for seeker responsiveness:

[0069] Under specified operating conditions, during testing, an optical power meter is used to measure the incident optical power of the seeker and the output voltage of each channel of the seeker. The data is then uploaded to the host computer. The incident optical power is adjusted, and the output voltage of the seeker is sampled every 100mV change. The response curve is then fitted in the host computer using the least squares method.

[0070] The specific testing steps for seeker responsiveness are as follows:

[0071] 1) Install the seeker onto the three-axis turntable of the hardware-in-the-loop simulation system, turn on the test system and calibrate it;

[0072] 2) Adjust the seeker to the initial position. At this time, the center of the seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the seeker are equal.

[0073] 3) Measure the output voltage V of the four channels of the seeker. P Remove the seeker head and measure the incident light power P using an optical power meter at the same location. in And upload the data to the host computer;

[0074] 4) Change the incident light power by adjusting the attenuator, and repeat step 3). Sample once every 100mV within the range of 0-4V output voltage of the seeker.

[0075] 5) In the host computer, the horizontal axis represents the incident light power and the vertical axis represents the output voltage. The response curve is fitted by the least squares method, and its slope is the responsivity.

[0076] 6) Shut down the test system.

[0077] Test method for inconsistency of four-channel output of the seeker:

[0078] The four-channel output inconsistency is a comparison of the consistency of the output signals generated by the four photosensitive areas of the seeker under the same light intensity. During testing, an optical system focuses the laser into a uniform spot, covering the entire photosensitive surface of the seeker. Based on the data measured in the aforementioned responsivity test method, the four-channel output inconsistency of the seeker is calculated in the host computer. The seeker is rotated, and multiple measurements are taken, with the average value recorded.

[0079] The test steps for the inconsistency of the four-channel output of the seeker are as follows:

[0080] 1) Install the seeker onto the three-axis turntable of the hardware-in-the-loop simulation system, turn on the test system and calibrate it;

[0081] 2) Adjust the seeker to the initial position. At this time, the center of the seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the seeker are equal.

[0082] 3) The laser beam expander generates a uniform spot, which covers the entire photosensitive surface of the seeker head.

[0083] 4) Based on the response R measured in the four quadrants in the above response test method, e 1. R e 2. R e 3. R e 4. Calculate the mean of the responsiveness.

[0084]

[0085] Calculate the standard deviation R of the four-channel responsivity e rms:

[0086]

[0087] The inconsistency in the four-channel output of the laser semi-active seeker is as follows:

[0088]

[0089] 5) Rotate the seeker head 90 degrees and repeat steps 3) and 4) to calculate a total of 4 sets of d. n Calculate the average value d:

[0090]

[0091] Where d is the average value of the four-channel output inconsistency of the laser semi-active seeker.

[0092] 6) Shut down the test system.

[0093] The laser semi-active seeker testing system and method described in this invention are applicable to miniature laser semi-active seekers. The required testing environment is built using hardware facilities such as a laser source, a laser target simulator, and a three-axis turntable. A set of testing software integrating motor control, data acquisition, plotting calculation, and performance evaluation is designed and developed on a host computer. This software can test multiple parameters of the seeker and achieve an objective evaluation of the performance of the laser semi-active seeker.

[0094] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A test method for a laser semi-active seeker, characterized in that, A laser semi-active seeker testing system is used to perform performance testing on a laser semi-active seeker. The laser semi-active seeker testing system includes: The laser target simulation unit installed on the optical platform (7) is used to simulate the echo signal generated after the laser irradiates the target; A seeker mount (3) for mounting a laser semi-active seeker is provided, the seeker mount (3) being mounted on a three-axis rotary table (4); the three-axis rotary table (4) is mounted on the optical platform (7) and driven by a stepper motor (6) mounted on the optical platform (7); the laser semi-active seeker is used to receive the echo signal; The laser target simulation unit, the laser semi-active seeker and the stepper motor (6) are respectively connected to the host computer for communication. The performance tests include testing the working distance, field of view, azimuth response, responsivity, and four-channel output inconsistency of the laser semi-active seeker. Among them, the field of view of the laser semi-active seeker was tested, specifically as follows: The laser semi-active seeker is mounted on the three-axis turntable (4) through the seeker mounting base (3), the test system is turned on and calibrated; Adjust the laser semi-active seeker to the initial position. At this time, the center of the laser semi-active seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the laser semi-active seeker are equal. The laser semi-active seeker head is controlled to rotate from the initial position to both sides by a three-axis turntable (4). The three-axis turntable (4) is rotated according to the set step size, and the output signal amplitude of the seeker head is measured. The angle between the laser semi-active seeker and the optical axis is continuously increased. When the output signal on one side of the seeker is just lost, the host computer measures the deflection angle at this time, which is the field of view of the seeker.

2. The laser semi-active seeker testing method according to claim 1, characterized in that, The laser target simulation unit includes a dark box (1) and a projection system (2); a laser is installed in the dark box (1), and the laser emitted by the laser is collimated into parallel light by a collimating lens. The parallel light is expanded by an electronic beam expander and then reflected by a galvanometer to an attenuating lens and a projection system (2), thereby generating an echo signal that simulates real conditions. Among them, the beam expander is used to adjust the change in the size of the laser spot; the galvanometer is used to simulate the change in the incident angle of the laser; and the attenuation lens and projection system (2) are used to simulate the interference that the laser is subjected to when it is transmitted in the atmospheric environment.

3. The laser semi-active seeker testing method according to claim 2, characterized in that, The laser is a pulsed laser, which outputs laser light with a wavelength of 1064nm.

4. The laser semi-active seeker testing method according to claim 3, characterized in that, The parameters of the pulsed laser, electronic beam expander, and galvanometer are configured via a host computer.

5. The laser semi-active seeker testing method according to claim 1, characterized in that, The working distance of the laser semi-active seeker was tested, specifically as follows: The laser semi-active seeker is mounted on the three-axis rotary table (4) using the seeker mounting bracket (3), and the output of the laser semi-active seeker is connected to an oscilloscope; the test system is turned on and calibrated; The equivalent optical power at different working distances is calibrated, and the calculation formula is as follows: ； in, For equivalent optical power, The optical power output by the laser. The atmospheric attenuation coefficient is the distance from the laser to the target illumination point. The diffuse reflectance of the target. The distance between the seeker and the target reflection point. The atmospheric attenuation coefficient is the distance from the target reflection point to the seeker head. Adjust the incident laser according to the set attenuation level, and measure the amplitude of the echo signal at this time; When the measured echo signal amplitude is equal to the preset value, remove the seeker and install an optical power meter in the same position, and record the reading of the optical power meter, which is the equivalent optical power at this time. The host computer calculates the working distance corresponding to the equivalent optical power, which is the maximum working distance of the laser semi-active seeker.

6. The laser semi-active seeker testing method according to claim 1, characterized in that, The azimuth response of the laser semi-active seeker was tested, specifically as follows: The laser semi-active seeker is mounted on the three-axis turntable (4) through the seeker mounting base (3), the test system is turned on and calibrated; Adjust the laser semi-active seeker to the initial position. At this time, the center of the laser semi-active seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the laser semi-active seeker are equal. The laser semi-active seeker head is controlled to deflect from the center to the set direction by a three-axis turntable (4), so that the incident light spot is only distributed in the first quadrant of the laser semi-active seeker head, and the output signal amplitude of each channel is measured. Similarly, the output signal amplitude of each channel of the laser semi-active seeker is measured sequentially when the incident light spot is distributed only in the second, third, and fourth quadrants of the laser semi-active seeker.

7. The laser semi-active seeker testing method according to claim 1, characterized in that, The responsivity of the laser semi-active seeker was tested, specifically as follows: The laser semi-active seeker is mounted on the three-axis turntable (4) through the seeker mounting base (3), the test system is turned on and calibrated; Adjust the laser semi-active seeker to the initial position. At this time, the center of the laser semi-active seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the laser semi-active seeker are equal. Measuring the output voltage of the four channels of a laser semi-active seeker Remove the laser semi-active seeker and measure the incident light power using an optical power meter at the same location. And upload the data to the host computer; Similarly, by adjusting the attenuator to change the incident light power, multiple samples are taken within the output voltage range of the laser semi-active seeker according to the set sampling frequency, and the data is uploaded to the host computer. In the host computer, the incident light power is plotted on the horizontal axis and the output voltage is plotted on the vertical axis. The response curve is fitted using the least squares method, and its slope is the responsivity.

8. The laser semi-active seeker testing method according to claim 7, characterized in that, The inconsistency of the four-channel output of the laser semi-active seeker was tested, specifically as follows: The laser semi-active seeker is mounted on the three-axis turntable (4) through the seeker mounting base (3), the test system is turned on and calibrated; Adjust the laser semi-active seeker to the initial position. At this time, the center of the laser semi-active seeker is coaxial with the laser, and the output signal amplitudes of the four channels of the laser semi-active seeker are equal. The laser beam expander generates a uniform spot that covers the entire photosensitive surface of the semi-active laser seeker. Based on the measured response in the four quadrants , , , Calculate the mean of the response. : ； Calculate the standard deviation of the four-channel response. : ； The inconsistency in the four-channel output of the laser semi-active seeker is as follows: ； Similarly, by rotating the laser semi-active seeker by a set angle, the inconsistency of the four-channel output of the laser semi-active seeker was measured again, and several sets of data were obtained. The average value was then calculated. ； in, This represents the average value of the four-channel output inconsistency of the laser semi-active seeker.

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