An airborne optoelectronic pod calibration method

Abstract

The application provides an airborne photoelectric pod calibration method, and belongs to the technical field of photoelectric pod calibration, and comprises the following steps: S1: using a jack to level the carrier aircraft; S2: placing lead balls at a third calibration point and a fourth calibration point at the aircraft belly, and marking a third mark point and a fourth mark point at the corresponding positions on the ground; S3: setting a mark point A; S4: placing a target plate at the mark point A, and marking a mark point B for determining the level of the target plate on the target plate; S5: determining the projection of the carrier aircraft axis on the target plate, and setting the mark point C; S6: determining the expected point D of the pod sensor optical axis on the target plate; S7: starting the photoelectric pod, aligning the cross in the center of the pod sensor picture with the expected point D, and completing the pod calibration. The method has the advantages that the equipment used in the calibration process is simple, a separate inertial navigation system hardware resource is not needed, the inertial navigation data of the aircraft is used, a large amount of cost is saved, the calibration method can quickly respond, and the target guiding efficiency of the photoelectric pod is improved.

Description

Technical Field

[0001] This invention belongs to the field of optoelectronic pod calibration technology, specifically relating to an airborne optoelectronic pod calibration method. Background Technology

[0002] One of the main uses of large amphibious firefighting aircraft is to meet the needs of forest fire fighting in high-risk areas. Their firefighting systems are equipped with water tanks. Previously, water drop for firefighting relied on the experience of pilots and mission personnel for precise deployment. Adding an electro-optical pod allows for a comprehensive view of the entire forest, precise tracking of fire sources, and automatic water drop, reducing the workload of pilots and mission personnel.

[0003] Airborne electro-optical pods can obtain images of the flight area. To achieve automatic water drop guidance, the aircraft's own inertial navigation information needs to be introduced. Installation errors between the airborne electro-optical pod and the inertial navigation system will affect the accuracy of automatic water drop.

[0004] Therefore, airborne electro-optical pods are required for target calibration. The method for airborne electro-optical pod target calibration is to ensure that the initial positions of the azimuth and pitch angles of the electro-optical pod are consistent with the initial positions of the azimuth and pitch angles of the aircraft body. Summary of the Invention

[0005] The purpose of this invention is to provide a method for ensuring that the initial positions of the azimuth and pitch angles of the electro-optical pod are consistent with the initial positions of the azimuth and pitch angles of the aircraft body.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an airborne optoelectronic pod target calibration method, comprising: S1: Use jacks to level the carrier aircraft, ensuring that the pitch and roll angles of the carrier aircraft are both 0; S2: Place lead balls at the third and fourth calibration points on the belly of the aircraft, and mark the third and fourth marker points on the ground at the corresponding positions. S3: Extend along the third and fourth marker points towards the machine head and set marker point A; S4: Place the target plate at mark point A, with the target plate perpendicular to the machine axis of the carrier aircraft, and mark mark point B on the target plate to determine the horizontality of the target plate. S5: Determine the projection of the carrier's shaft onto the target plate using marker points A and B, and designate it as marker point C; S6: Move the target plate downwards by a distance d from the marked point C. The distance d is the distance from the optical axis of the pod sensor to the machine axis. Determine the desired point D of the optical axis of the pod sensor on the target plate. S7: Activate the photoelectric pod, align the center crosshair of the pod's sensor screen with the desired point D, and complete the pod target calibration.

[0007] The airborne optoelectronic pod target calibration method provided by the present invention also has the following technical feature: the step of using jacks to level the aircraft includes placing jacks on the front wheel, the left rear wheel, and the right rear wheel of the aircraft.

[0008] The airborne optoelectronic pod target calibration method provided by the present invention also has the following technical features to ensure that the pitch angle of the carrier aircraft is 0: selecting a first calibration point and a second calibration point on the fuselage respectively, and using a high-intensity light level to measure and ensure that the height of the first calibration point and the second calibration point are consistent and are in the same plane as the carrier aircraft axis.

[0009] The airborne optoelectronic pod target calibration method provided by the present invention also has the following technical feature: the marker point B is at the same height as the first calibration point and the second calibration point.

[0010] The airborne optoelectronic pod target calibration method provided by the present invention also has the following technical features to ensure that the roll angle of the carrier aircraft is 0: setting a fifth calibration point and a sixth calibration point on the two wings of the carrier aircraft respectively, the fifth calibration point and the sixth calibration point being symmetrically set and having the same height.

[0011] The airborne optoelectronic pod target calibration method provided by the present invention also has the following technical feature: the third calibration point and the fourth calibration point are located directly below the central axis of the carrier aircraft.

[0012] The airborne optoelectronic pod target calibration method provided by the present invention also has the following technical feature: the distance between the marker point A and the nose of the aircraft is 20m.

[0013] The airborne optoelectronic pod target calibration method provided by this invention also has the following technical feature: the distance d from the optical axis of the pod sensor to the machine shaft is the sum of the distance from the machine shaft to the pod mounting surface and the distance from the pod mounting surface to the optical axis of the pod sensor.

[0014] Beneficial effects: The airborne optoelectronic pod calibration method provided by this invention uses simple equipment during the calibration process, does not require separate inertial navigation system hardware resources, utilizes aircraft inertial navigation data, saves a lot of costs, and the calibration method can respond quickly, improving the target guidance efficiency of the optoelectronic pod. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram illustrating the principle of the target calibration method provided in the embodiments of the present invention. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0018] In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0019] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0021] like Figure 1 As shown, this embodiment of the invention provides a method for airborne optoelectronic pod target calibration, including: S1: Use jacks to level the carrier aircraft, ensuring that the pitch and roll angles of the carrier aircraft are both 0; S2: Place lead balls at the third calibration point 3 and the fourth calibration point 4 on the belly of the aircraft, and mark the third marker point 3' and the fourth marker point 4' on the ground at the corresponding positions; S3: Extend along the third marker point 3' and the fourth marker point 4' towards the machine head, and set marker point A; S4: Place the target plate at mark point A, with the target plate perpendicular to the machine axis of the carrier aircraft, and mark mark point B on the target plate to determine the horizontality of the target plate. S5: Determine the projection of the carrier's shaft onto the target plate using marker points A and B, and designate it as marker point C; S6: Move the target plate downwards by a distance d from the marked point C. The distance d is the distance from the optical axis of the pod sensor to the machine axis. Determine the desired point D of the optical axis of the pod sensor on the target plate. S7: Activate the photoelectric pod, align the center crosshair of the pod's sensor screen with the desired point D, and complete the pod target calibration.

[0022] In some embodiments, leveling the carrier with jacks includes placing jacks on the front wheel, left rear wheel, and right rear wheel of the carrier.

[0023] In some embodiments, ensuring the aircraft's pitch angle is 0 includes: selecting a first calibration point 1 and a second calibration point 2 on the fuselage, and using a high-intensity light level to measure and ensure that the first calibration point 1 and the second calibration point 2 are at the same height and are on the same plane as the aircraft's axis. Marker point B is at the same horizontal height as the first calibration point 1 and the second calibration point 2.

[0024] In some embodiments, ensuring that the roll angle of the carrier aircraft is 0 includes: setting a fifth calibration point 5 and a sixth calibration point 6 on the two wings of the carrier aircraft respectively, with the fifth calibration point 5 and the sixth calibration point 6 set symmetrically and at the same height.

[0025] In some embodiments, the third calibration point 3 and the fourth calibration point 4 are located directly below the centerline of the aircraft.

[0026] In some embodiments, the distance between the marker point A and the nose of the carrier aircraft is 20m. A laser pointer can be used to ensure alignment during the extension process.

[0027] In some embodiments, the distance d from the optical axis of the pod sensor to the machine shaft is the sum of the distance from the machine shaft to the pod mounting surface and the distance from the pod mounting surface to the optical axis of the pod sensor.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. 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 protection scope of the present invention.

Claims

1. A method for airborne optoelectronic pod target calibration, characterized in that, include: S1: Use jacks to level the carrier aircraft. Select the first and second calibration points on the aircraft body. Use a high-intensity light level to measure and ensure that the first and second calibration points are at the same height and are on the same plane as the carrier aircraft shaft. Ensure that the pitch and roll angles of the carrier aircraft are both 0. S2: Place lead balls at the third and fourth calibration points on the belly of the aircraft, and mark the third and fourth marker points on the ground at the corresponding positions. S3: Extend along the third and fourth marker points towards the machine head and set marker point A; S4: Place a target plate at mark point A, with the target plate perpendicular to the aircraft shaft, and mark mark point B on the target plate. Mark point B is at the same horizontal height as the first calibration point and the second calibration point. S5: Determine the projection of the carrier's shaft onto the target plate using marker points A and B, and designate it as marker point C; S6: Move the target plate downwards by a distance d from the marked point C. The distance d is the distance from the optical axis of the pod sensor to the machine axis. Determine the desired point D of the optical axis of the pod sensor on the target plate. S7: Activate the photoelectric pod, align the center crosshair of the pod's sensor screen with the desired point D, and complete the pod target calibration.

2. The airborne optoelectronic pod target calibration method according to claim 1, characterized in that, The step of using jacks to level the carrier aircraft includes placing jacks on the front wheel, left rear wheel, and right rear wheel of the carrier aircraft, respectively.

3. The airborne optoelectronic pod target calibration method according to claim 1, characterized in that, Ensuring the aircraft's roll angle is 0 includes setting a fifth calibration point and a sixth calibration point on each of the two wings of the aircraft. The fifth and sixth calibration points are set symmetrically and at the same height.

4. The airborne optoelectronic pod target calibration method according to claim 1, characterized in that, The third and fourth calibration points are located directly below the centerline of the aircraft.

5. The airborne optoelectronic pod target calibration method according to claim 1, characterized in that, The distance between the marker point A and the nose of the aircraft is 20m.

6. The airborne optoelectronic pod target calibration method according to claim 1, characterized in that, The distance d from the optical axis of the pod sensor to the machine shaft is the sum of the distance from the machine shaft to the pod mounting surface and the distance from the pod mounting surface to the optical axis of the pod sensor.

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