A target calibration device for airborne fire control radar antenna

Abstract

The invention relates to the field of radar antenna target calibration, and in particular to a target calibration device for an airborne fire control radar antenna, comprising a laser target calibration device, a target plate base, a rotation adjustment mechanism, a translation adjustment mechanism, a lifting adjustment mechanism, a pitch adjustment mechanism and a target plate mechanism. By designing the laser target calibration device, the visual deviation of a visual mirror target calibration method is corrected, and the problem that the visual target calibration itself has a large deviation, which leads to inaccurate target calibration or aggravates the deviation before target calibration is solved. By designing a laser lamp to replace a traditional target calibration mirror, the problem that the target calibration distance of the target calibration mirror of the traditional visual target calibration method is limited and cannot meet the long-distance target calibration requirements and the effective distance of the traditional target calibration mirror does not exceed 50 meters is solved, and the current target calibration distance is mostly more than 250 meters. According to the principle of the eccentric circle method, the deviation value can be simply and quickly obtained, and the target calibration is completed by inputting the deviation value into a radar coordinate system, thereby avoiding the problem of complex traditional target calibration algorithms.

Description

Technical Field

[0001] The invention relates to the field of radar antenna target calibration, and in particular to a target calibration device for an airborne fire control radar antenna. Background Art

[0002] The antenna of the airborne fire control radar will produce certain errors during the processing, transportation and assembly process. The specific error is the deviation between the axis of the antenna of the airborne fire control radar and the axis of the radar turntable. This error will cause the airborne fire control radar to produce data deviation when capturing the target, which will lead to inaccurate fire strikes. Therefore, the deviation is corrected before the radar antenna is assembled, that is, the target is calibrated. Traditional target calibration mostly uses the visual mirror target calibration method. The current target calibration device is to design a target calibration fixture, install a target calibration mirror on the target calibration fixture, and the optical axis of the target calibration mirror is completely parallel to the mechanical axis of the radar antenna. Then observe the error between the center of the cross mark in the target calibration mirror and the corresponding center point on the opposite target plate. By adjusting the angle of the radar turntable, the error between the two is within the allowable range, and the mechanical axis alignment is completed. This target calibration device has the following defects:

[0003] 1. Visual target calibration itself has a large deviation, which leads to inaccurate target calibration or aggravates the deviation before target calibration.

[0004] 2. The calibration distance of the target scope of the visual calibration method is limited and cannot meet the long-distance calibration requirements. The effective distance of the traditional target scope does not exceed 50 meters, while the current calibration distance is mostly required to be more than 250 meters.

[0005] 3. Traditional target calibration devices require complex calculations after calibration, which is time-consuming and labor-intensive. Summary of the invention

[0006] The purpose of the present invention is to provide a target calibration device for an airborne fire control radar antenna.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] Provided is a target calibration device for an airborne fire control radar antenna, comprising a radar turntable and an antenna mounting seat, and also comprising a laser target calibration device, a target plate base, a rotation adjustment mechanism, a translation adjustment mechanism, a lifting adjustment mechanism, a pitch adjustment mechanism and a target plate mechanism. The laser target calibration device is fixedly connected to the radar turntable, the target plate base is placed on the ground, the rotation adjustment mechanism is rotatably connected to the target plate base, the translation adjustment mechanism is slidably connected to the rotation adjustment mechanism, the lifting adjustment mechanism is fixedly connected to the translation adjustment mechanism, the pitch adjustment mechanism is rotatably installed on the lifting adjustment mechanism, and the target plate mechanism is fixedly installed on the pitch adjustment mechanism.

[0009] Furthermore, the laser target calibration device includes an analog antenna, a first laser lamp, a clamp and a second laser lamp. The analog antenna is fixedly connected to the antenna mounting base, a first spotlight groove is opened at the end of the analog antenna, the first laser lamp is fixedly installed in the first spotlight groove, the clamp is clamped on the radar turntable, a first connecting column is provided on the clamp, a second spotlight groove is opened on the first connecting column, and the second laser lamp is fixedly installed in the second spotlight groove.

[0010] Furthermore, the target plate base includes a workbench and a plurality of wheels. The plurality of wheels for moving and supporting the target plate base are rotatably connected to the workbench. A first supporting groove and a second supporting groove are provided on the workbench. The first supporting groove and the second supporting groove are rotatably connected to the rotating adjustment mechanism respectively.

[0011] Furthermore, the rotation adjustment mechanism includes a turntable, an adjusting gear and a first adjusting turntable. A rotating shaft is provided at the bottom of the turntable. The rotating shaft at the bottom of the turntable is rotatably connected in the first supporting groove. A rotating shaft is also provided at the bottom of the adjusting gear. The rotating shaft at the bottom of the adjusting gear is rotatably connected in the second supporting groove. The first adjusting turntable is fixedly connected to the adjusting gear. A gear plate is provided at the lower part of the turntable. The gear plate and the adjusting gear are meshed. A first guide groove is opened on the turntable, and the first guide groove is slidably connected to the translation adjustment mechanism.

[0012] Furthermore, the translation adjustment mechanism includes a sliding table, a mounting plate, a first limit plate and a second adjustment turntable. The sliding table is slidably connected to the turntable, the mounting plate is fixedly connected to the edge of the turntable, and the mounting plate is located at one end of the first guide groove. The first limit plate is fixedly connected to the mounting plate, and the first limit plate and the second adjustment turntable are rotatably connected, and the second adjustment turntable is threadedly connected to the sliding table.

[0013] Furthermore, a first slide rail is provided at the bottom end of the sliding platform, and the first slide rail is slidably connected in the first guide groove. A first threaded rod is provided at one end of the sliding platform, and the first threaded rod is threadedly connected to the second adjusting dial.

[0014] Furthermore, the lifting and adjusting mechanism includes a first support plate, a second support plate, a first connecting plate, a second connecting plate, a lifting platform, a third adjusting turntable and two sliding rods, the first support plate and the second support plate are respectively fixedly connected to the sliding platform, the first connecting plate is fixedly connected to the upper end of the first support plate, the second connecting plate is fixedly connected to the upper end of the second support plate, one end of the first connecting plate is provided with two positioning blocks and positioning bolts for docking positioning, one end of the first connecting plate is also provided with a first limiting groove, the first limiting groove and the third adjusting turntable are rotatably connected, one end of the second connecting plate is provided with two positioning grooves and a first connecting ear for docking positioning, one end of the second connecting plate is also provided with a second limiting groove, the second limiting groove and the third adjusting turntable are rotatably connected, the two positioning blocks are respectively clamped with the two positioning grooves, and the two positioning bolts are respectively fixedly connected with the two first connecting ears.

[0015] Furthermore, the lifting platform includes two sliding rods, a second threaded rod is provided at the bottom of the lifting platform, the second threaded rod is threadedly connected to the third adjusting turntable, second connecting ears are provided on both sides of the lifting platform, the two sliding rods are fixedly connected to the two second connecting ears respectively, and limiting holes are respectively provided on the first connecting plate and the second connecting plate, and the lower parts of the two sliding rods are respectively slidably inserted into the two limiting holes, a first hinge seat is provided at the upper end of the lifting platform, the first hinge seat is rotatably connected to the pitch adjustment mechanism, and a second guide groove is also provided at the upper end of the lifting platform, and the second guide groove is slidably connected to the pitch adjustment mechanism.

[0016] The cam is secured to the bottom of the second support bracket, and the cam is secured to the bottom of the second support bracket.

[0017] Furthermore, the target plate mechanism includes a target plate, a precision level and a laser receiver. The target plate is fixedly connected to the second connecting column. A mounting platform is provided on one side of the target plate. A mounting groove is provided on the side of the mounting platform. A light-transmitting hole passing through the target plate is provided at the bottom of the mounting groove. The precision level is fixedly connected to the upper end of the mounting platform, and the laser receiver is fixedly connected in the mounting groove.

[0018] Beneficial effects of the present invention:

[0019] 1. The target calibration device of an airborne fire control radar antenna of the present invention corrects the visual deviation of the visual mirror target calibration method by designing a laser target calibration device, thereby solving the problem that the visual target calibration itself has a large deviation, resulting in inaccurate target calibration or aggravating the deviation before target calibration.

[0020] 2. The target calibration device of an airborne fire control radar antenna of the present invention solves the problems that the target calibration mirror of the traditional visual target calibration method has a limited target calibration distance and cannot meet the long-distance target calibration requirements, and the effective distance of the traditional target calibration mirror does not exceed fifty meters, by designing a laser lamp to replace the traditional target calibration mirror. It meets the current target calibration distance requirement of more than two hundred and fifty meters.

[0021] 3. The target calibration device of an airborne fire control radar antenna of the present invention can simply and quickly obtain a deviation value based on the principle of the eccentric circle method, and the target calibration is completed by inputting the deviation value into the radar coordinate system, thus avoiding the complex problems of traditional target calibration algorithms. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments of the present invention are briefly introduced below.

[0023] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall three-dimensional structure of the present invention from another viewing angle;

[0025] Figure 3 It is a schematic diagram of the overall three-dimensional structure decomposition of the laser target calibration device of the present invention;

[0026] Figure 4 It is a schematic diagram of the overall three-dimensional structure of the target plate base of the present invention;

[0027] Figure 5 It is a schematic diagram of the overall three-dimensional structure decomposition of the rotation adjustment mechanism and the translation adjustment mechanism of the present invention;

[0028] Figure 6 It is a schematic diagram of the overall three-dimensional structure decomposition of the lifting and lowering adjustment mechanism of the present invention;

[0029] Figure 7 It is a schematic diagram of the overall three-dimensional structure decomposition of the pitch adjustment mechanism of the present invention;

[0030] Figure 8 It is a schematic diagram of the overall three-dimensional structure decomposition of the target plate mechanism of the present invention;

[0031] Fig. 9It is a schematic diagram of the front view of the target plate and the target calibration method of the present invention;

[0032] In the figure:

[0033] 1. Radar turntable; 1a. Antenna mounting base;

[0034] 2. Laser target calibration device; 2a. Simulated antenna; 2b. First spotlight slot; 2c. First laser light; 2d. Clamp; 2e. First connecting column; 2f. Second spotlight slot; 2g. Second laser light;

[0035] 3. Target plate base; 3a. Workbench; 3b. Wheel; 3c. First support groove; 3d. Second support groove;

[0036] 4. Rotary adjustment mechanism; 4a. Turntable; 4b. Gear plate; 4c. First guide groove; 4d. Adjustment gear; 4e. First adjustment turntable;

[0037] 5. Translation adjustment mechanism; 5a. Sliding table; 5a1. First slide rail; 5a2. First threaded rod; 5b. Mounting plate; 5c. First limit plate; 5d. Second adjustment dial;

[0038] 6. Lifting adjustment mechanism; 6a. First support plate; 6b. Second support plate; 6c. First connecting plate; 6d. Positioning block; 6e. First limiting groove; 6f. Positioning bolt; 6g. Second connecting plate; 6h. Positioning groove; 6j. Second limiting groove; 6k. First connecting ear; 6m. Lifting platform; 6m1. Second threaded rod; 6m2. Second connecting ear; 6m3. First hinge seat; 6m4. Second guide groove; 6n. Sliding rod; 6p. Third adjusting dial;

[0039] 7, pitch adjustment mechanism; 7a, support rod; 7b, second connecting column; 7c, second hinge seat; 7d, connecting rod; 7e, slider; 7f, third threaded rod; 7g, second slide rail; 7h, third hinge seat; 7j, locking threaded column; 7k, locking turntable; 7m, limit nut; 7n, second limit plate; 7p, fourth adjustment turntable;

[0040] 8. Target plate mechanism; 8a. Target plate; 8b. Mounting table; 8c. Mounting slot; 8d. Light-transmitting hole; 8e. Precision level; 8f. Laser receiver. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0042] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product.

[0043] Reference Figures 1 to 9 The target calibration device of an airborne fire control radar antenna shown in the figure includes a radar turntable 1 and an antenna mounting base 1a, and also includes a laser target calibration device 2, a target plate base 3, a rotation adjustment mechanism 4, a translation adjustment mechanism 5, a lifting adjustment mechanism 6, a pitch adjustment mechanism 7 and a target plate mechanism 8. The laser target calibration device 2 is fixedly connected to the radar turntable 1, the target plate base 3 is placed on the ground, the rotation adjustment mechanism 4 is rotatably connected to the target plate base 3, the translation adjustment mechanism 5 is slidably connected to the rotation adjustment mechanism 4, the lifting adjustment mechanism 6 is fixedly connected to the translation adjustment mechanism 5, the pitch adjustment mechanism 7 is rotatably installed on the lifting adjustment mechanism 6, and the target plate mechanism 8 is fixedly installed on the pitch adjustment mechanism 7.

[0044] The laser target calibration device 2 includes an analog antenna 2a, a first laser lamp 2c, a clamp 2d and a second laser lamp 2g. The analog antenna 2a is fixedly connected to the antenna mounting base 1a. A first spotlight groove 2b is provided at the end of the analog antenna 2a. The first laser lamp 2c is fixedly installed in the first spotlight groove 2b. The clamp 2d is clamped on the radar turntable 1. A first connecting column 2e is provided on the clamp 2d. A second spotlight groove 2f is provided on the first connecting column 2e. The second laser lamp 2g is fixedly installed in the second spotlight groove 2f. The traditional visual scope target calibration itself will produce a large error. The device is designed with a first laser lamp 2c and a second laser lamp 2g to improve the traditional visual calibration. On the one hand, the calibration accuracy is further improved, and on the other hand, complex calculations are avoided, saving the calibration time. Before calibration, the target plate base 3 is moved to the required distance position, and the first laser lamp 2c is first turned on. By adjusting the rotation adjustment mechanism 4, the translation adjustment mechanism 5, the lifting adjustment mechanism 6 and the pitch adjustment mechanism 7, the target plate 8a is made to face the laser calibration device 2, and the light beam emitted by the first laser lamp 2c passes through the light-transmitting hole 8d and is received by the laser receiver 8f. In this way, the first step of the calibration is completed, that is, finding the projection axis of the axis of the radar antenna on the target plate 8a. The axis is the center of the light-transmitting hole 8d. We set the center of the light-transmitting hole 8d as the coordinate origin "O", and the X-coordinate axis is the line from the center of the light-transmitting hole 8d to the rightmost side of the target plate 8a. The Y coordinate axis is the line from the center of the light-transmitting hole 8d to the upper end of the target plate 8a. Then, the second laser lamp 2g is turned on, and the point where the light beam emitted by the second laser lamp 2g falls on the target plate 8a for the first time is marked as point "A". Then, the radar turret 1 is rotated so that the light beam emitted by the second laser lamp 2g rotates synchronously on the target plate 8a. After the radar turret 1 rotates a certain angle, the point where the light beam emitted by the second laser lamp 2g falls on the target plate 8a for the second time is marked as point "B". The radar turret 1 is continued to be rotated to a certain angle. Mark the point where the light beam emitted by the second laser lamp 2g for the third time falls on the target plate 8a, recorded as point "C". At this time, the second step of target calibration is completed, that is, find the projection axis of the radar turntable's rotation axis on the target plate 8a, which we set as point "P". In the third step, remove the target plate 8a, connect points ABC to form a triangle, set as triangle ABC, select any two sides of triangle ABC as perpendicular bisectors, and the intersection of the two perpendicular bisectors is the center of the circumscribed circle of triangle ABC, that is, the circumcenter of triangle ABC, which is also point "P". The distance between point "P" and the coordinate origin "O" is the deviation, which requires us to adjust the data input into the radar coordinate system. According to the distance between the target plate 8a and the laser target calibration device 2, that is, our target calibration distance, calculate the deviation values ​​from point "P" to the X-axis and Y-axis in the same proportion, and input the values ​​into the radar coordinate system, and the target calibration is completed.

[0045] The target plate base 3 includes a workbench 3a and a plurality of wheels 3b, and the plurality of wheels 3b for moving and supporting the target plate base 3 are rotatably connected to the workbench 3a, and the workbench 3a is provided with a first support groove 3c and a second support groove 3d, and the first support groove 3c and the second support groove 3d are respectively rotatably connected to the rotary adjustment mechanism 4. The target plate mechanism 8 is laborious in the process of moving, so the design of the target plate base 3 makes the device more convenient to move. In the traditional visual scope target calibration method, the effective visual distance of the calibration target mirror does not exceed fifty meters, and the distance exceeding will cause serious errors, but the current calibration target distance requires two hundred and fifty meters or more, so the traditional visual scope target calibration method is difficult to meet the calibration target requirements. The device is provided with a laser calibration target device 2, which reduces the error of the calibration work itself and greatly improves the calibration target distance.

[0046] The rotation adjustment mechanism 4 includes a turntable 4a, an adjustment gear 4d and a first adjustment turntable 4e. A rotation shaft is provided at the bottom of the turntable 4a, and the rotation shaft at the bottom of the turntable 4a is rotatably connected to the first support groove 3c. A rotation shaft is also provided at the bottom of the adjustment gear 4d, and the rotation shaft at the bottom of the adjustment gear 4d is rotatably connected to the second support groove 3d. The first adjustment turntable 4e is fixedly connected to the adjustment gear 4d. A gear plate 4b is provided at the lower part of the turntable 4a, and the gear plate 4b is meshed with the adjustment gear 4d. A first guide groove 4c is provided on the turntable 4a, and the first guide groove 4c is slidably connected to the translation adjustment mechanism 5. The target plate mechanism 8 needs to have the ability of full-range adjustment, so that the target plate 8a can be directly opposite to the laser calibration device 2, and the light beam emitted by the first laser lamp 2c passes through the light transmission hole 8d and is received by the laser receiver 8f. Therefore, the rotation adjustment mechanism 4 is designed, and the rotation adjustment mechanism 4 can make the target plate 8a rotate horizontally, and then adjust the target plate 8a to the required position.

[0047] The translation adjustment mechanism 5 includes a sliding table 5a, a mounting plate 5b, a first limit plate 5c and a second adjustment turntable 5d. The sliding table 5a is slidably connected to the turntable 4a, the mounting plate 5b is fixedly connected to the edge of the turntable 4a, and the mounting plate 5b is located at one end of the first guide groove 4c. The first limit plate 5c is fixedly connected to the mounting plate 5b, and the first limit plate 5c is rotatably connected to the second adjustment turntable 5d, and the second adjustment turntable 5d is threadedly connected to the sliding table 5a. The target plate mechanism 8 needs to have the ability of full-range adjustment, so that the target plate 8a can be directly facing the laser calibration device 2, and the light beam emitted by the first laser lamp 2c passes through the light-transmitting hole 8d and is received by the laser receiver 8f. Therefore, the translation adjustment mechanism 5 is designed to move the target plate base 3 to complete the approximate position of the target plate mechanism 8. The translation adjustment mechanism 5 is a fine-tuning structure, which can make the target plate 8a move slightly horizontally, and then accurately adjust the target plate 8a to the required position.

[0048] The bottom end of the sliding platform 5a is provided with a first slide rail 5a1, which is slidably connected in the first guide groove 4c, and one end of the sliding platform 5a is provided with a first threaded rod 5a2, which is threadedly connected with the second adjustment dial 5d. The sliding platform 5a is provided to complete the adjustment of the micro-horizontal movement of the target plate 8a, and then accurately adjust the target plate 8a to the required position.

[0049] The lifting and adjusting mechanism 6 includes a first supporting plate 6a, a second supporting plate 6b, a first connecting plate 6c, a second connecting plate 6g, a lifting platform 6m, a third adjusting turntable 6p and two sliding rods 6n. The first supporting plate 6a and the second supporting plate 6b are respectively fixedly connected to the sliding platform 5a. The first connecting plate 6c is fixedly connected to the upper end of the first supporting plate 6a, and the second connecting plate 6g is fixedly connected to the upper end of the second supporting plate 6b. One end of the first connecting plate 6c is provided with two positioning blocks 6d and a positioning bolt 6f for docking positioning. One end of the first connecting plate 6c is also provided with a first limiting groove 6e, and the first limiting groove 6e is rotatably connected to the third adjusting turntable 6p. One end of the second connecting plate 6g is provided with two positioning grooves 6h and a first connecting ear 6k for docking positioning. One end of the second connecting plate 6g is also provided with a second limiting groove 6j, and the second limiting groove 6j is rotatably connected to the third adjusting turntable 6p. The two positioning blocks 6d are respectively engaged with the two positioning grooves 6h, and the two positioning bolts 6f are respectively fixedly connected to the two first connecting ears 6k. Different models have different radar structures, resulting in radar turntables 1 of different heights. Therefore, a lifting and adjusting mechanism 6 is designed to adjust the height of the target plate mechanism 8 so that the target plate 8a can be directly opposite the laser calibration device 2, and the light beam emitted by the first laser lamp 2c passes through the light-transmitting hole 8d and is received by the laser receiver 8f.

[0050] The lifting platform 6m includes two slide bars 6n, a second threaded rod 6m1 is provided at the bottom of the lifting platform 6m, the second threaded rod 6m1 is threadedly connected to the third adjustment dial 6p, second connecting ears 6m2 are provided on both sides of the lifting platform 6m, two slide bars 6n are fixedly connected to the two second connecting ears 6m2, the first connecting plate 6c and the second connecting plate 6g are respectively provided with limited holes, the lower parts of the two slide bars 6n are respectively slidably inserted in the two limited holes, the upper end of the lifting platform 6m is provided with a first hinge seat 6m3, the first hinge seat 6m3 is rotatably connected to the pitch adjustment mechanism 7, and the upper end of the lifting platform 6m is also provided with a second guide groove 6m4, the second guide groove 6m4 is slidably connected to the pitch adjustment mechanism 7. The lifting platform 6m is set to complete the adjustment of the micro-vertical movement of the target plate 8a, and then accurately adjust the target plate 8a to the required position. The slide bar 6n prevents the target plate mechanism 8 from rotating during the vertical movement, thereby ensuring the adjustment accuracy of the target plate 8a.

[0051] The pitch adjustment mechanism 7 includes a support rod 7a, a connecting rod 7d, a slider 7e, a locking turntable 7k, a limiting nut 7m, a second limiting plate 7n and a fourth adjusting turntable 7p. The bottom end of the support rod 7a is hinged on the first hinge seat 6m3, and the upper end of the support rod 7a is provided with a second connecting column 7b. The second connecting column 7b is fixedly connected to the target plate mechanism 8. A second hinge seat 7c is provided on one side of the upper part of the support rod 7a. A third hinge seat 7h is provided on the upper end of the slider 7e. One end of the connecting rod 7d is hinged to the second hinge seat 7c, and the other end is hinged to the third hinge seat 7h. A second slide rail 7g is provided at the lower end of the slider 7e. The second slide rail 7g is slidably connected in the second guide groove 6m4. A locking threaded column 7j is provided at the lower end of the second slide rail 7g. The locking threaded column 7j is threadedly connected to the locking turntable 7k, and the locking turntable 7k conflicts with the lower end of the second guide groove 6m4. The limiting nut 7m is fixedly connected to the lower end of the locking threaded column 7j. A third threaded rod 7f is provided on one side of the second slide rail 7g, a fourth adjustment dial 7p is threadedly connected to the third threaded rod 7f, a second limit plate 7n is fixedly connected to the second guide groove 6m4 port, and the second limit plate 7n and the fourth adjustment dial 7p are rotatably connected. Different models have different radar structures, resulting in radar turntables 1 with different angles. Therefore, the pitch adjustment mechanism 7 designed to adjust the angle of the target plate mechanism 8 can make the target plate 8a face the laser calibration device 2, and the light beam emitted by the first laser lamp 2c passes through the light-transmitting hole 8d and is received by the laser receiver 8f. The pitch angle of the target plate 8a is adjusted by rotating the fourth adjustment dial 7p to face the laser calibration device 2, and then the locking dial 7k is rotated to fix the slider 7e, thereby fixing the target plate 8a.

[0052] The target plate mechanism 8 includes a target plate 8a, a precision level 8e and a laser receiver 8f. The target plate 8a is fixedly connected to the second connecting column 7b. A mounting platform 8b is provided on one side of the target plate 8a. A mounting groove 8c is provided on the side of the mounting platform 8b. A light-transmitting hole 8d passing through the target plate 8a is provided at the bottom of the mounting groove 8c. The precision level 8e is fixedly connected to the upper end of the mounting platform 8b, and the laser receiver 8f is fixedly connected in the mounting groove 8c. Whether it is the traditional visual mirror calibration method or the calibration method used in the present device, the target plate mechanism 8 is an important device, and the target plate 8a needs to be adjusted to face the calibration device, otherwise it will cause deviation in the calibration. Therefore, a series of adjustment mechanisms are designed to adjust and control the target plate mechanism 8 so that the target plate mechanism 8 can face the laser calibration device 2, so as to complete the calibration more accurately.

[0053] Working principle: The traditional visual scope calibration itself will produce a large error. The device is designed with the first laser light 2c and the second laser light 2g to improve the traditional visual calibration. On the one hand, the calibration accuracy is further improved, and on the other hand, complex calculations are avoided, saving the calibration time. Before calibration, the target plate base 3 is moved to the required distance position, and the first laser light 2c is first turned on. By adjusting the rotation adjustment mechanism 4, the translation adjustment mechanism 5, the lifting adjustment mechanism 6 and the pitch adjustment mechanism 7, the target plate 8a is directly facing the laser calibration device 2, and the light beam emitted by the first laser light 2c passes through the light-transmitting hole 8d and is received by the laser receiver 8f. In this way, the first step of the calibration is completed, that is, the projection axis of the axis of the radar antenna on the target plate 8a is found. The axis is the center of the light-transmitting hole 8d. We set the center of the light-transmitting hole 8d as the coordinate origin "O", the X coordinate axis is the line from the center of the light-transmitting hole 8d to the rightmost side of the target plate 8a, and the Y coordinate axis is the line from the center of the light-transmitting hole 8d to the upper end of the target plate 8a, and then the second laser light 2g is turned on. Mark the point where the light beam emitted by the second laser lamp 2g falls on the target plate 8a for the first time, recorded as point "A", and then rotate the radar turntable 1 so that the light beam emitted by the second laser lamp 2g rotates synchronously on the target plate 8a. After the radar turntable 1 rotates a certain angle, mark the point where the light beam emitted by the second laser lamp 2g falls on the target plate 8a for the second time, recorded as point "B", and continue to rotate the radar turntable 1 to a certain angle, mark the point where the light beam emitted by the second laser lamp 2g falls on the target plate 8a for the third time, recorded as point "C", and now the second step of target calibration is completed, that is, finding the projection axis of the radar turntable rotation axis on the target plate 8a, which we set as point "P". The third step is to remove the target plate 8a, connect the points ABC to form a triangle, set it as triangle ABC, select any two sides of triangle ABC as perpendicular bisectors, the intersection of the two perpendicular bisectors is the center of the circumscribed circle of triangle ABC, that is, the circumcenter of triangle ABC, that is, point "P", the distance between point "P" and the coordinate origin "O" is the deviation, which requires us to adjust the data input into the radar coordinate system, according to the distance between the target plate 8a and the laser calibration device 2, that is, our calibration distance, calculate the deviation values ​​of point "P" to the X-axis and Y-axis respectively in the same proportion, and input the values ​​into the radar The coordinate system is reached, that is, the calibration is completed. The target plate mechanism 8 is relatively laborious in the process of moving, so the target plate base 3 is designed to make the device easier to move. In the traditional visual mirror calibration method, the effective visual distance of the calibration mirror does not exceed 50 meters. Exceeding the distance will cause serious errors. However, the current calibration distance requires 250 meters or more. Therefore, the traditional visual mirror calibration method is difficult to meet the calibration requirements. The device is equipped with a laser calibration device 2, which reduces the error of the calibration work itself and greatly improves the calibration distance. The target plate mechanism 8 needs to have the ability to adjust in all directions so that the target plate 8a can face the laser calibration device 2, and the light beam emitted by the first laser lamp 2c passes through the light-transmitting hole 8d and is received by the laser receiver 8f.Therefore, a rotation adjustment mechanism 4 is designed, which can make the target plate 8a rotate horizontally, and then adjust the target plate 8a to the required position. At the same time, a translation adjustment mechanism 5 is designed to move the target plate base 3 to complete the approximate position of the target plate mechanism 8. The translation adjustment mechanism 5 is a fine-tuning structure, which can make the target plate 8a move slightly horizontally, and then accurately adjust the target plate 8a to the required position. Different models have different radar architectures, resulting in radar turntables 1 with different heights. Therefore, a lifting and lowering adjustment mechanism 6 is designed to adjust the height of the target plate mechanism 8, so that the target plate 8a can be directly opposite the laser calibration device 2, and the light beam emitted by the first laser lamp 2c passes through the light-transmitting hole 8d and is received by the laser receiver 8f. Different models have different radar architectures, resulting in radars with different angles. Turntable 1, therefore, a pitch adjustment mechanism 7 is designed for adjusting the angle of the target plate mechanism 8, so that the target plate 8a can face the laser target calibration device 2, and the light beam emitted by the first laser lamp 2c passes through the light-transmitting hole 8d and is received by the laser receiver 8f. The pitch angle of the target plate 8a is adjusted by rotating the fourth adjustment dial 7p to face the laser target calibration device 2, and then the locking dial 7k is rotated to fix the slider 7e, thereby fixing the target plate 8a. Whether it is the traditional visual mirror target calibration method or the target calibration method used in this device, the target plate mechanism 8 is an important device, and the target plate 8a needs to be adjusted to face the target calibration device, otherwise it will cause deviation in the target calibration. Therefore, a series of adjustment mechanisms are designed to adjust and control the target plate mechanism 8, so that the target plate mechanism 8 can face the laser target calibration device 2, so as to complete the target calibration more accurately. ,

Claims

1. A target calibration device for an airborne fire control radar antenna, comprising a radar turntable (1) and an antenna mounting seat (1a), characterized in that: The invention comprises a laser target calibration device (2), a target plate base (3), a rotation adjustment mechanism (4), a translation adjustment mechanism (5), a lifting adjustment mechanism (6), a pitch adjustment mechanism (7) and a target plate mechanism (8); the laser target calibration device (2) is fixedly connected to a radar turntable (1); the target plate base (3) is placed on the ground; the rotation adjustment mechanism (4) is rotationally connected to the target plate base (3); the translation adjustment mechanism (5) is slidably connected to the rotation adjustment mechanism (4); the lifting adjustment mechanism (6) is fixedly connected to the translation adjustment mechanism (5); the pitch adjustment mechanism (7) is rotationally mounted on the lifting adjustment mechanism (6); and the target plate mechanism (8) is fixedly mounted on the pitch adjustment mechanism (7); The laser target calibration device (2) comprises a simulation antenna (2a), a first laser lamp (2c), a clamp (2d) and a second laser lamp (2g); the simulation antenna (2a) is fixedly connected to an antenna mounting base (1a); a first spotlight slot (2b) is provided at the end of the simulation antenna (2a); the first laser lamp (2c) is fixedly installed in the first spotlight slot (2b); the clamp (2d) is clamped on a radar turret (1); a first connecting column (2e) is provided on the clamp (2d); a second spotlight slot (2f) is provided on the first connecting column (2e); and the second laser lamp (2g) is fixedly installed in the second spotlight slot (2f).

2. The target calibration device for an airborne fire control radar antenna according to claim 1, characterized in that: The target plate base (3) comprises a workbench (3a) and a plurality of wheels (3b); the plurality of wheels (3b) for moving and supporting the target plate base (3) are rotatably connected to the workbench (3a); a first supporting groove (3c) and a second supporting groove (3d) are provided on the workbench (3a); the first supporting groove (3c) and the second supporting groove (3d) are rotatably connected to a rotation adjustment mechanism (4) respectively.

3. The target calibration device for an airborne fire control radar antenna according to claim 2, characterized in that: The rotary adjustment mechanism (4) comprises a turntable (4a), an adjustment gear (4d) and a first adjustment turntable (4e). A rotation shaft is arranged at the bottom of the turntable (4a). The rotation shaft at the bottom of the turntable (4a) is rotatably connected to the first support groove (3c). A rotation shaft is also arranged at the bottom of the adjustment gear (4d). The rotation shaft at the bottom of the adjustment gear (4d) is rotatably connected to the second support groove (3d). The first adjustment turntable (4e) is fixedly connected to the adjustment gear (4d). A gear plate (4b) is arranged at the bottom of the turntable (4a). The gear plate (4b) and the adjustment gear (4d) are meshed. A first guide groove (4c) is opened on the turntable (4a). The first guide groove (4c) is slidably connected to the translation adjustment mechanism (5).

4. The target calibration device for an airborne fire control radar antenna according to claim 3, characterized in that: The translation adjustment mechanism (5) comprises a sliding platform (5a), a mounting plate (5b), a first limiting plate (5c) and a second adjusting turntable (5d); the sliding platform (5a) is slidably connected to the turntable (4a); the mounting plate (5b) is fixedly connected to the edge of the turntable (4a); the mounting plate (5b) is located at one end of the first guide groove (4c); the first limiting plate (5c) is fixedly connected to the mounting plate (5b); the first limiting plate (5c) and the second adjusting turntable (5d) are rotatably connected; and the second adjusting turntable (5d) is threadedly connected to the sliding platform (5a).

5. The target calibration device for an airborne fire control radar antenna according to claim 4, characterized in that: A first slide rail (5a1) is arranged at the bottom end of the sliding platform (5a), and the first slide rail (5a1) is slidably connected in the first guide groove (4c). A first threaded rod (5a2) is arranged at one end of the sliding platform (5a), and the first threaded rod (5a2) is threadedly connected to the second adjusting dial (5d).

6. The target calibration device for an airborne fire control radar antenna according to claim 5, characterized in that: The lifting and adjusting mechanism (6) comprises a first supporting plate (6a), a second supporting plate (6b), a first connecting plate (6c), a second connecting plate (6g), a lifting platform (6m), a third adjusting turntable (6p) and two sliding rods (6n); the first supporting plate (6a) and the second supporting plate (6b) are respectively fixedly connected to the sliding platform (5a); the first connecting plate (6c) is fixedly connected to the upper end of the first supporting plate (6a); the second connecting plate (6g) is fixedly connected to the upper end of the second supporting plate (6b); one end of the first connecting plate (6c) is provided with two positioning blocks (6d) and a positioning screw for docking and positioning The bolt (6f) is provided at one end of the first connecting plate (6c), and the first limiting groove (6e) is rotatably connected to the third adjusting turntable (6p). Two positioning grooves (6h) and a first connecting ear (6k) for docking positioning are provided at one end of the second connecting plate (6g). A second limiting groove (6j) is also provided at one end of the second connecting plate (6g), and the second limiting groove (6j) is rotatably connected to the third adjusting turntable (6p). Two positioning blocks (6d) are respectively engaged with the two positioning grooves (6h), and two positioning bolts (6f) are respectively fixedly connected to the two first connecting ears (6k).

7. The target calibration device for an airborne fire control radar antenna according to claim 6, characterized in that: The lifting platform (6m) comprises two sliding rods (6n). A second threaded rod (6m1) is arranged at the bottom of the lifting platform (6m). The second threaded rod (6m1) is threadedly connected to the third adjusting dial (6p). Second connecting ears (6m2) are arranged on both sides of the lifting platform (6m). The two sliding rods (6n) are respectively fixedly connected to the two second connecting ears (6m2). The first connecting plate (6c) and the second connecting plate (6g) are respectively provided with limiting holes. The lower parts of the two sliding rods (6n) are respectively slidably inserted into the two limiting holes. A first hinge seat (6m3) is arranged at the upper end of the lifting platform (6m). The first hinge seat (6m3) is rotatably connected to the pitch adjustment mechanism (7). A second guide groove (6m4) is also arranged at the upper end of the lifting platform (6m). The second guide groove (6m4) is slidably connected to the pitch adjustment mechanism (7).

8. The target calibration device for an airborne fire control radar antenna according to claim 7, characterized in that: The pitch adjustment mechanism (7) comprises a support rod (7a), a connecting rod (7d), a slider (7e), a locking turntable (7k), a limit nut (7m), a second limit plate (7n) and a fourth adjustment turntable (7p); the bottom end of the support rod (7a) is hinged on the first hinge seat (6m3); the upper end of the support rod (7a) is provided with a second connecting column (7b); the second connecting column (7b) and the target plate mechanism (8) are fixedly connected; a second hinge seat (7c) is provided on one side of the upper part of the support rod (7a); the upper end of the slider (7e) is provided with a third hinge seat (7h); one end of the connecting rod (7d) is hinged to the second hinge seat (7c); the other end is hinged to the third hinge seat (7h); the lower end of the slider (7e) is hinged to the second hinge seat (7c); the lower end of the slider (7e) is hinged to the third hinge seat (7h); A second slide rail (7g) is provided at the end, the second slide rail (7g) is slidably connected in the second guide groove (6m4), a locking threaded column (7j) is provided at the lower end of the second slide rail (7g), the locking threaded column (7j) and the locking turntable (7k) are threadedly connected, and the locking turntable (7k) and the lower end of the second guide groove (6m4) are in contact, a limiting nut (7m) is fixedly connected to the lower end of the locking threaded column (7j), a third threaded rod (7f) is provided on one side of the second slide rail (7g), a fourth adjustment turntable (7p) is threadedly connected to the third threaded rod (7f), a second limiting plate (7n) is fixedly connected to the end of the second guide groove (6m4), and the second limiting plate (7n) and the fourth adjustment turntable (7p) are rotatably connected.

9. The target calibration device for an airborne fire control radar antenna according to claim 8, characterized in that: The target plate mechanism (8) comprises a target plate (8a), a precision level (8e) and a laser receiver (8f); the target plate (8a) is fixedly connected to the second connecting column (7b); a mounting platform (8b) is provided on one side of the target plate (8a); a mounting groove (8c) is provided on the side of the mounting platform (8b); a light-transmitting hole (8d) passing through the target plate (8a) is provided at the bottom of the mounting groove (8c); the precision level (8e) is fixedly connected to the upper end of the mounting platform (8b); and the laser receiver (8f) is fixedly connected in the mounting groove (8c).

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