Aircraft target calibration equipment calibration precision detection device and method

Abstract

The application discloses an airplane target alignment equipment calibration precision detection device, which comprises a mounting base plate, a first lifting device, a reference laser, an image acquisition device, an optical calibration ball group, a measured equipment mounting platform, a second lifting device, a calibration laser, an airplane target alignment tool, an airplane target alignment clamp, an optical scale plate, a measured airplane target alignment equipment, a display control terminal and a control device. The application also discloses an airplane target alignment equipment calibration precision detection method. The reference laser and the calibration laser are used for initial position adjustment, and the azimuth angle, the pitch angle and the roll angle after movement are calculated to detect the calibration precision of the airplane target alignment equipment, so that the detection precision of the device is ensured. The calibration precision of single-function and multi-function target alignment equipment, such as inertial navigation target alignment equipment, flat display target alignment equipment and radar antenna target alignment equipment, is detected, and the result can be used for factory test, parameter adjustment and error correction of the target alignment equipment.

Description

Technical Field

[0001] This invention relates to the field of aircraft target calibration technology, and in particular to a device and method for detecting the calibration accuracy of aircraft target calibration equipment. Background Technology

[0002] Aircraft target calibration is a general term for calibrating the mechanical installation references or optical axis pointing references of various devices in airborne radar, inertial navigation, head-up display, and electro-optical detection systems on the ground, whether the aircraft is level or not. It is a routine and important task that is directly related to the hit rate of airborne fire control and the mission efficiency of the entire fire control system, and directly affects the combat effectiveness or safety of the aircraft.

[0003] Currently, the main methods for target calibration include traditional mechanical target calibration, laser tracker target calibration, total station target calibration, and machine vision target calibration. Traditional target calibration requires leveling the aircraft, placing a target calibration bracket directly in front of the aircraft, adjusting the position of the target calibration mirror mounted on the bracket according to the center of the bracket, observing the target pattern on the target board through the equipment to be calibrated, adjusting the aiming at the target board marking line, or measuring the error with the marking line to calculate the angle deviation.

[0004] Laser tracker calibration, total station calibration, and machine vision calibration are all forms of photoelectric calibration. The aircraft does not need to be leveled; it can be parked freely. Laser trackers, total stations, and visual measurement equipment directly or indirectly measure marked points on the aircraft. These marked points are characterized by high structural strength, good rigidity, and accurate coordinates, establishing a reference coordinate plane for the aircraft to characterize its attitude information (including pitch, azimuth, and roll). Then, calibration fixtures are used to characterize the mounting reference plane or reference axis of the equipment to be calibrated. These fixtures are designed with clear marking patterns, which can be plotted using laser trackers, total stations, and visual measurement equipment. These patterns establish a unique transformation relationship with the reference of the equipment to be calibrated. After transformation to the aircraft coordinate system, the deviation between the measured equipment and the aircraft reference can be calculated, completing the calibration.

[0005] However, although there are many calibration devices available now, the calibration accuracy of these devices is still at the simulation calculation stage, and there is no dedicated testing device to calibrate the final calibration accuracy of the calibration devices.

[0006] In addition, Chinese patent application publication number CN114265421A discloses an intelligent aircraft target calibration system and its usage method. This patent requires the aircraft to be level for target calibration. It includes a total station, a measuring rod, an observation and aiming system, a calibration computer, and a target calibration gimbal. The calibration computer has a built-in target calibration program. The calibration computer is connected to the observation and aiming system via a target calibration data cable, and the calibration computer is connected to the target calibration gimbal via a servo control cable. The total station maps the aircraft attitude and the target calibration gimbal, establishing a relatively perpendicular relationship between the target calibration gimbal and the aircraft attitude within a reference system with the total station as the coordinate origin. Adjusting the attitude of the target calibration gimbal replaces adjusting the aircraft attitude. Through the control of the calibration computer's target calibration program, it achieves manual correction of the electronic target's yaw angle, intelligent control of the pitch angle, and intelligent control of the target image center and roll angle. It completes the target calibration by acquiring observation data from the observation and aiming system in real time and transmitting the target calibration correction compensation coefficient. However, the disadvantages of this patent are low target calibration accuracy and complex operation. The various systems of an aircraft are designed to achieve tactical objectives, requiring high precision in their orientation and attitude. Therefore, calibration equipment is needed to calibrate the attitude of each system. However, this calibration equipment must undergo rigorous accuracy testing before it can be used on an aircraft. The aforementioned patent is for calibrating aircraft, not for the equipment itself. Summary of the Invention

[0007] The purpose of this invention is to address the aforementioned shortcomings and defects of the prior art by providing a device and method for detecting the calibration accuracy of aircraft target calibration equipment, thereby solving the above-mentioned problems.

[0008] The technical problem solved by this invention can be achieved by the following technical solutions:

[0009] A calibration accuracy testing device for aircraft target calibration equipment, comprising:

[0010] Mounting substrate;

[0011] A first lifting device connected to the mounting base plate, the first lifting device driving the mounting base plate to lift;

[0012] A reference laser is mounted on the mounting substrate;

[0013] An image acquisition device is mounted on the mounting substrate;

[0014] An optical calibration ball assembly is mounted on the mounting base plate. The optical calibration ball assembly includes three uprights arranged in a triangular position and a first optical ball located at the top of the uprights. The centers of the three first optical balls are connected to form a spatial reference plane, representing the aircraft reference plane.

[0015] The device under test mounting platform is disposed above the mounting base plate, and the device under test mounting platform is used to simulate the mounting plane of the airborne calibration device;

[0016] A second lifting device is disposed on the mounting base plate, the second lifting device is connected to the mounting platform of the device under test, and the second lifting device drives the mounting platform of the device under test to rise and fall.

[0017] A calibration laser is installed on the mounting platform of the device under test;

[0018] Aircraft calibration fixture set on the mounting platform of the device under test;

[0019] The aircraft calibration fixture is set on the aircraft calibration tooling. The aircraft calibration fixture includes three mutually perpendicular straight rods and a second optical ball set at the top of the straight rods. The centers of the three second optical balls are connected to form a three-dimensional coordinate system. It is installed on the aircraft calibration tooling to indicate the azimuth, pitch and roll angle of the mounting surface of the equipment under test.

[0020] An optical scale plate is positioned in front of the reference laser and the calibration laser;

[0021] The target calibration equipment for the aircraft under test;

[0022] A control device connected to the reference laser, image acquisition device, calibration laser, first lifting device, second lifting device, target calibration equipment for the aircraft under test, and display and control terminal.

[0023] In a preferred embodiment of the present invention, the reference laser and the calibration laser are helium-neon lasers.

[0024] In a preferred embodiment of the present invention, the upright and straight rods are carbon fiber rods, and the first and second optical spheres are glossy ceramic spheres.

[0025] In a preferred embodiment of the present invention, the device under test mounting platform is a precision optical platform. The platform is used to simulate the mounting plane of the airborne device to be calibrated and provides mounting interfaces for airborne inertial navigation, head-up display, radar antenna and other equipment. Calibration is to calibrate the deviation between the mounting surface of the device and the reference surface of the aircraft.

[0026] In a preferred embodiment of the present invention, the aircraft calibration fixture has the same mounting interface as airborne inertial navigation, head-up display, radar antenna and other equipment, and is installed on the mounting platform of the equipment under test instead of the equipment under test, while providing a mounting interface for the aircraft calibration fixture.

[0027] In a preferred embodiment of the present invention, the first lifting device includes a plurality of first lifting motors, which are spaced apart below the mounting base. The bottom of each first lifting motor is fixed and the top telescopic end is connected to the mounting base. The plurality of first lifting motors lift and lower simultaneously when they are working.

[0028] In a preferred embodiment of the present invention, the second lifting device includes a plurality of second lifting motors, which are spaced apart below the mounting platform of the device under test. The bottom of each second lifting motor is fixed to the mounting base plate, and the top telescopic end is connected to the mounting platform of the device under test. The plurality of second lifting motors lift and lower simultaneously when they are working.

[0029] In a preferred embodiment of the present invention, the optical scale plate includes a reflective plate with precision reticles, the reticles being etched, each reticle corresponding to a corresponding label, and the horizontal and vertical reticles intersecting to form a "cross". The azimuth and elevation information of the two light spots can be quickly read out by combining the labels.

[0030] In a preferred embodiment of the present invention, the test aircraft calibration device measures three feature marker points on the aircraft fuselage and three marker points on the aircraft calibration fixture, respectively establishing the aircraft reference and coordinate system and the installation plane and coordinate system of the test equipment. Through coordinate transformation, the coordinates are unified to the aircraft coordinate system, and the azimuth angle, pitch angle and roll angle between the aircraft calibration fixture and the aircraft reference plane are calculated, thus completing the calibration.

[0031] A method for detecting the calibration accuracy of an aircraft target calibration device, utilizing an aircraft target calibration accuracy detection device as described in any of the above technical solutions, includes the following steps:

[0032] Step 1: Adjust the distance between the optical scale plate and the reference laser and calibration laser. The reference laser emits a laser beam that shines on the optical scale plate, showing a "cross" spot. Adjust the first lifting device and observe the position of the "cross" spot on the optical scale plate. Make the "cross" spot coincide with the center "0" of the two reference lines "H" and "V" on the optical scale plate. Then turn off the reference laser.

[0033] Step 2: The laser emits a laser beam, which shines onto the optical scale plate, presenting a "cross" light spot. Adjust the first lifting device and observe the position of the "cross" light spot on the optical scale plate. Make the "cross" light spot coincide with the center "0" of the two reference lines "H" and "V" on the optical scale plate, with coordinates (H0, V0). At this time, the aircraft reference plane simulated by the optical calibration ball group is completely parallel to the reference plane of the installation platform of the equipment under test.

[0034] Step 3: The calibration laser emits laser light and maintains the output state. Randomly adjust the second lifting device to move the light spot emitted by the calibration laser on the optical scale plate. Stop at any position and mark it as measurement position "1". The coordinates in the coordinate system formed by "H" and "V" are (H1, V1). The coordinates of the four endpoints of the "cross" light spot are (H11, V11), (H12, V12), (H13, V13), (H14, V14). The length of the "cross" light spot line is L, and the distance from the optical scale plate to the calibration laser is M.

[0035] Step 4: The image acquisition device acquires the position image of the laser spot on the optical scale at this time, and transmits it to the display and control terminal through the control device. The position of the spot is calculated by the built-in normalized spot position calculation algorithm. The calculation equation is as follows, where α1, β1, and γ1 are the azimuth, pitch, and roll angles calculated by the aircraft target calibration accuracy detection device itself at position "1".

[0036]

[0037]

[0038]

[0039] Step 5: The test aircraft calibration equipment begins simulated calibration, measuring the optical spherical coordinates of the optical calibration ball group and the aircraft calibration fixture. The calibration software calculates the azimuth, pitch, and roll angle deviations between the aircraft calibration fixture mounting surface and the aircraft reference surface constructed by the optical calibration ball group, and these deviations are recorded as follows:

[0040] Step Six: Repeat steps Two, Three, Four, and Five above to obtain position "2". The aircraft calibration accuracy detection device itself calculates the azimuth, pitch, and roll angles α2, β2, and γ2 at position "2". The tested aircraft calibration equipment obtains the azimuth, pitch, and roll angle deviations between the aircraft calibration fixture mounting surface and the aircraft reference surface constructed by the optical calibration ball assembly.

[0041] Step 7: Repeat steps 2, 3, 4, and 5 above to obtain position "3". The aircraft calibration accuracy detection device itself calculates the azimuth, pitch, and roll angles α3, β3, and γ3 at position "3". The tested aircraft calibration equipment obtains the azimuth, pitch, and roll angle deviations between the aircraft calibration fixture mounting surface and the aircraft reference surface constructed by the optical calibration ball assembly.

[0042] Step 8: The above α, β, γ and The included angle between them is the calibration error Δ of the target calibration equipment for the tested aircraft.α The root mean square method is used to calculate the error of the three measurements, and the formula is as follows:

[0043]

[0044] By employing the above technical solution, this invention uses a reference laser and a calibration laser for initial position adjustment, and calculates the azimuth, pitch, and roll angles after movement to detect the calibration accuracy of the aircraft calibration equipment, ensuring the device's detection accuracy. This invention detects the calibration accuracy of single-function and multi-function calibration equipment such as inertial navigation calibration equipment, head-up display calibration equipment, and radar antenna calibration equipment. The results can be used for factory testing, parameter adjustment, and error correction of the calibration equipment. This device has advantages such as simple structural design, high testing accuracy, convenient operation, strong adaptability, and a wide testing range. Attached Figure Description

[0045] 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.

[0046] Figure 1 This is a schematic diagram of an embodiment of the calibration accuracy detection device for aircraft target calibration equipment according to the present invention.

[0047] Figure 2 This is a schematic diagram of an optical scale plate according to an embodiment of the present invention.

[0048] Figure 3 This is an image of a laser spot on an optical scale plate according to an embodiment of the present invention. Detailed Implementation

[0049] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention is further described below.

[0050] See Figures 1 to 3 As shown, an aircraft calibration accuracy testing device includes a mounting base plate 1, a first lifting device 2, a reference laser 10, an image acquisition device 8, an optical calibration ball group 3, a test equipment mounting platform 4, a second lifting device 9, a calibration laser 7, an aircraft calibration fixture 5, an aircraft calibration jig 6, an optical scale plate 13, the test aircraft calibration equipment 14, a display and control terminal 12, and a control device 11.

[0051] The optical calibration ball assembly 3, image acquisition device 8, reference laser 10, and control device 11 are mounted on the mounting base 1. The control device 11 is connected to the reference laser 10, image acquisition device 8, calibration laser 7, first lifting device 2, second lifting device 9, the aircraft under test calibration device 14, and display and control terminal 12. The image acquisition device 8 is an image acquisition camera, a high-resolution camera, aligned with the output optical axis of the calibration laser 7, used to acquire images on the optical scale plate 13. The reference laser 10 is a helium-neon laser with the best collimation, capable of emitting a standard "cross" beam to indicate the direction of the aircraft's reference axis. The optical calibration ball assembly 3 includes three uprights 3a arranged in a triangular configuration and a first optical ball 3b positioned at the top of the uprights 3a. The diameter and center of the ball are precisely calibrated to the mounting surface of the uprights 3a. The centers of the three first optical balls are connected to form a spatial reference plane, representing the aircraft's reference plane. The uprights 3a are carbon fiber rods, and the first optical ball 3b is a bright ceramic ball. The precision-engineered bright ceramic spheres and carbon fiber rods possess excellent radiation resistance, antistatic properties, antimagnetic properties, high toughness, high strength, high hardness, and high wear resistance. The precision-engineered bright ceramic spheres can reflect light of a specified wavelength in all directions, enabling the calibration and evaluation of measurement errors in laser measurement equipment, laser scanning equipment, and visual measurement equipment. The control device 11, a control box, provides power, control commands, and signal transmission for the reference laser 10, calibration laser 7, first lifting device 2, second lifting device 9, and image acquisition device 8.

[0052] The first lifting device 2 is connected to the mounting base plate 1, and the first lifting device 2 drives the mounting base plate 1 to rise and fall. In this embodiment, the mounting base plate 1 is triangular, and the first lifting device 2 includes three first lifting motors. The three first lifting motors are distributed below the three corners of the mounting base plate 1. The bottom of each first lifting motor is fixed by the mounting block 1a, and the top telescopic end is connected to the mounting base plate 1. The three first lifting motors rise and fall simultaneously when they are working.

[0053] The device under test (DUT) mounting platform 4 is positioned above the mounting base plate 1, simulating the mounting plane of the airborne device being calibrated. A second lifting device 9 is mounted on the mounting base plate 1 and connected to the DUT mounting platform 4, driving the DUT mounting platform 4 to rise and fall. In this embodiment, the DUT mounting platform 4 is triangular. The second lifting device 9 includes three second lifting motors, distributed below the three corners of the DUT mounting platform 4. The bottom of each second lifting motor is fixed to the mounting base plate 1, and its top telescopic end is connected to the DUT mounting platform 4. All three second lifting motors rise and fall simultaneously during operation.

[0054] The calibration laser 7 and the aircraft calibration fixture 5 are mounted on the equipment under test (DUT) mounting platform 4, and the aircraft calibration fixture 6 is mounted on the aircraft calibration fixture 5. The calibration laser 7 is a helium-neon laser with the best collimation, capable of emitting a standard "cross" beam. The DUT mounting platform 4 is a precision optical platform used to simulate the mounting plane of the airborne DUT, providing mounting interfaces for airborne inertial navigation systems, head-up displays, radar antennas, etc. Calibration is the process of calibrating the deviation between the mounting surface of the calibration equipment and the aircraft reference plane. The aircraft calibration fixture 5 has the same mounting interfaces as the airborne inertial navigation systems, head-up displays, radar antennas, etc., and is mounted on the DUT mounting platform 4 in place of the DUT, while also providing a mounting interface for the aircraft calibration fixture 6. The aircraft calibration fixture 6 includes three mutually perpendicular straight rods 6a and a second optical sphere 6b located at the top of the rods 6a. The center of the sphere is precisely calibrated with the fixture mounting plane. The centers of the three second optical spheres are connected to form a three-dimensional coordinate system, mounted on the aircraft calibration fixture, representing the azimuth, pitch, and roll angles of the DUT's mounting surface. The straight rod 6a is a carbon fiber rod, and the second optical ball 6b is a bright ceramic ball. The aircraft calibration fixture 6 and the optical calibration ball group 3 are not limited to the above-mentioned combination of ceramic ball and carbon fiber rod, as long as they can represent the plane that needs to be calibrated.

[0055] An optical scale plate 13 is positioned in front of the reference laser 10 and the calibration laser 7. The optical scale plate 13 includes a reflective plate with precision reticles. The reticles are etched, and each reticle corresponds to a specific number. The horizontal and vertical axes are represented by the English letters a, b, c, d, e, ..., w, x, y. The horizontal and vertical reticles intersect to form a cross. The azimuth and elevation information of the two light spots can be quickly read out by combining the numbers.

[0056] The test aircraft calibration equipment 14 measures three characteristic marker points on the aircraft fuselage and three marker points on the aircraft calibration fixture, respectively establishing the aircraft reference and coordinate system and the installation plane and coordinate system of the test equipment. Through coordinate transformation, it is unified to the aircraft coordinate system, and the azimuth, pitch and roll angles between the aircraft calibration fixture and the aircraft reference plane are calculated, thus completing the calibration.

[0057] A method for detecting the calibration accuracy of an aircraft target calibration device, utilizing any of the above-mentioned technical solutions, includes the following steps:

[0058] Step 1: Adjust the distance between the optical scale plate 13 and the reference laser 10 and calibration laser 7. The reference laser 10 emits a laser beam that shines on the optical scale plate 13, forming a crosshair. Adjust the first lifting device 2 and observe the position of the crosshair on the optical scale plate 13. Make the crosshair coincide with the center "0" of the two reference lines "H" and "V" on the optical scale plate. Then turn off the reference laser 10.

[0059] Step 2: The laser 7 emits a laser beam, which shines on the optical scale plate 13, presenting a "cross" light spot. Adjust the first lifting device 2 and observe the position of the "cross" light spot on the optical scale plate 13 so that the "cross" light spot coincides with the center "0" of the two reference lines "H" and "V" on the optical scale plate, with coordinates (H0, V0). At this time, the aircraft reference plane simulated by the optical calibration ball group 3 is completely parallel to the reference plane of the installation platform of the equipment under test.

[0060] Step 3: The calibration laser 7 emits laser light and maintains the output state. The second lifting device 9 is randomly adjusted to move the light spot emitted by the calibration laser 7 on the optical scale plate. The laser spot stops at any position and is recorded as measurement position "1". The coordinates of the laser spot in the coordinate system formed by "H" and "V" are (H1, V1). The coordinates of the four endpoints of the "cross" light spot are (H11, V11), (H12, V12), (H13, V13), and (H14, V14). The length of the "cross" light spot line is L, and the distance from the optical scale plate to the calibration laser is M.

[0061] Step 4: The image acquisition device 8 acquires the position image of the laser spot on the optical scale plate 13 at this time, and transmits it to the display and control terminal 12 through the control device 11. The position of the spot is calculated by the built-in normalized spot position calculation algorithm. The calculation equation is as follows, where α1, β1, and γ1 are the azimuth, pitch, and roll angles calculated by the aircraft target calibration equipment calibration accuracy detection device itself at position "1".

[0062]

[0063]

[0064]

[0065] Step 5: The test aircraft calibration equipment 14 begins simulated calibration, measuring the optical spherical coordinates of the optical calibration ball group 3 and the aircraft calibration fixture 6 respectively. The calibration software calculates the azimuth, pitch, and roll angle deviations between the aircraft calibration fixture mounting surface and the aircraft reference surface constructed by the optical calibration ball group, and these deviations are recorded as follows:

[0066] Step Six: Repeat steps Two, Three, Four, and Five above to obtain position "2". The aircraft calibration accuracy detection device itself calculates the azimuth, pitch, and roll angles α2, β2, and γ2 at position "2". The tested aircraft calibration equipment 14 obtains the azimuth, pitch, and roll angle deviations between the aircraft calibration fixture mounting surface and the aircraft reference surface constructed by the optical calibration ball assembly.

[0067] Step 7: Repeat steps 2, 3, 4, and 5 above to obtain position "3". The aircraft calibration accuracy detection device itself calculates the azimuth, pitch, and roll angles α3, β3, and γ3 at position "3". The tested aircraft calibration equipment 14 obtains the azimuth, pitch, and roll angle deviations between the aircraft calibration fixture mounting surface and the aircraft reference surface constructed by the optical calibration ball assembly.

[0068] Step 8: The above α, β, γ and The included angle between them is the calibration error Δ of the target calibration equipment for the tested aircraft. α The root mean square method is used to calculate the error of the three measurements, and the formula is as follows:

[0069]

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A calibration accuracy testing device for aircraft target calibration equipment, characterized in that, include: Mounting substrate; A first lifting device connected to the mounting base plate, the first lifting device driving the mounting base plate to lift; A reference laser is mounted on the mounting substrate; An image acquisition device is mounted on the mounting substrate; An optical calibration ball assembly is mounted on the mounting base plate. The optical calibration ball assembly includes three uprights arranged in a triangular position and a first optical ball located at the top of the uprights. The centers of the three first optical balls are connected to form a spatial reference plane, representing the aircraft reference plane. The device under test mounting platform is disposed above the mounting base plate, and the device under test mounting platform is used to simulate the mounting plane of the airborne calibration device; A second lifting device is disposed on the mounting base plate, the second lifting device is connected to the mounting platform of the device under test, and the second lifting device drives the mounting platform of the device under test to rise and fall. A calibration laser is installed on the mounting platform of the device under test; Aircraft calibration fixture set on the mounting platform of the device under test; The aircraft calibration fixture is set on the aircraft calibration tooling. The aircraft calibration fixture includes three mutually perpendicular straight rods and a second optical ball set at the top of the straight rods. The centers of the three second optical balls are connected to form a three-dimensional coordinate system. It is installed on the aircraft calibration tooling to indicate the azimuth, pitch and roll angle of the mounting surface of the equipment under test. An optical scale plate is positioned in front of the reference laser and the calibration laser; The target calibration equipment for the aircraft under test; A control device connected to the reference laser, image acquisition device, calibration laser, first lifting device, second lifting device, target calibration equipment for the aircraft under test, and display and control terminal.

2. The calibration accuracy detection device for aircraft target calibration equipment as described in claim 1, characterized in that, The reference laser and calibration laser are helium-neon lasers.

3. The calibration accuracy testing device for aircraft target calibration equipment as described in claim 1, characterized in that, The upright and straight rods are carbon fiber rods, and the first and second optical spheres are glossy ceramic spheres.

4. The calibration accuracy detection device for aircraft target calibration equipment as described in claim 1, characterized in that, The test device mounting platform is a precision optical platform. The platform is used to simulate the mounting plane of the airborne equipment to be calibrated and provides mounting interfaces for airborne inertial navigation, head-up display, and radar antennas. Target calibration is to calibrate the deviation between the mounting surface of the equipment and the aircraft reference surface.

5. The calibration accuracy detection device for aircraft target calibration equipment as described in claim 1, characterized in that, The aircraft calibration fixture has the same mounting interface as airborne inertial navigation, head-up display, and radar antenna, and can be installed on the mounting platform of the device under test instead of the device under test, while also providing a mounting interface for the aircraft calibration fixture.

6. The calibration accuracy detection device for aircraft target calibration equipment as described in claim 1, characterized in that, The first lifting device includes a plurality of first lifting motors, which are spaced apart below the mounting base. The bottom of each first lifting motor is fixed and the top telescopic end is connected to the mounting base. The plurality of first lifting motors lift and lower simultaneously when they are working.

7. The calibration accuracy detection device for aircraft target calibration equipment as described in claim 1, characterized in that, The second lifting device includes a plurality of second lifting motors, which are spaced apart below the mounting platform of the device under test. The bottom of each second lifting motor is fixed to the mounting base plate, and the top telescopic end is connected to the mounting platform of the device under test. The plurality of second lifting motors lift and lower simultaneously when they are working.

8. The calibration accuracy detection device for aircraft target calibration equipment as described in claim 1, characterized in that, The optical scale includes a reflective plate with precision reticles, which are etched. Each reticle corresponds to a specific number, and the horizontal and vertical reticles intersect to form a "cross". The azimuth and elevation information of the two light spots can be quickly read by combining the numbers.

9. The calibration accuracy detection device for aircraft target calibration equipment as described in claim 1, characterized in that, The test aircraft calibration equipment measures three characteristic marker points on the aircraft fuselage and three marker points on the aircraft calibration fixture, respectively establishing the aircraft reference and coordinate system and the installation plane and coordinate system of the test equipment. Through coordinate transformation, the coordinates are unified to the aircraft coordinate system, and the azimuth, pitch and roll angles between the aircraft calibration fixture and the aircraft reference plane are calculated, thus completing the calibration.

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