Method for rapidly obtaining capture domain of signal detection device

Abstract

The invention discloses a method for quickly obtaining a capture domain of a signal detection device. The method comprises the following steps: establishing an instantaneous capture domain boundary of the signal detection device; and setting a flight orbit inclination angle to be unchanged, and obtaining a full-orbit capture domain of the signal detection device based on the instantaneous capture domain. According to the method for rapidly obtaining the capture domain of the signal detection device, the calculation amount is low, the calculation efficiency of the capture domain of the signal detection device can be remarkably improved, and the obtained result of the capture domain of the signal detection device is high in accuracy.

Description

Technical Field

[0001] This invention relates to a method for rapidly obtaining the capture domain of a signal detection device, belonging to the field of aircraft control technology. Background Technology

[0002] Signal detection devices are essential components of precision guidance, used for real-time target acquisition.

[0003] In practical applications, signal detection devices operate in complex environments with numerous interference factors, such as low signal-to-noise ratio, background clutter, beam propagation characteristics, and atmospheric attenuation.

[0004] In practical use, it is necessary to obtain the acquisition range of the signal detection device in advance so as to select appropriate guidance decisions for the aircraft and ensure that the target is always within the field of view of the signal detection device.

[0005] Existing signal detection methods are slow to acquire the target domain under complex operating conditions and interference, resulting in slower guidance decisions by the aircraft in the early stages of target discovery and making it easier to lose the target.

[0006] Therefore, it is necessary to conduct a more in-depth study on the existing methods for capturing the domain of signal detection devices in order to solve the above problems. Summary of the Invention

[0007] To overcome the above problems, the inventors conducted in-depth research and proposed a method for rapidly obtaining the capture domain of a signal detection device, characterized by the following steps:

[0008] S1. Establish the instantaneous acquisition domain boundary of the signal detection device;

[0009] S2. Obtain the full-track acquisition domain of the signal detection device based on the instantaneous acquisition domain.

[0010] In a preferred embodiment, in S1, the instantaneous acquisition domain boundary of the signal detection device is represented as:

[0011]

[0012] in,

[0013] x t Let z be the x-coordinate of the target in the target coordinate system. t Let x be the height coordinate of the target in the target coordinate system. m Let z be the x-coordinate of the spacecraft in the target coordinate system. mLet R represent the altitude coordinates of the aircraft in the target coordinate system, H represent the effective range of the signal detection device, A, B, and C represent intermediate variables, η represent the relationship between the downward angle and the half-field of view of the signal detection device, and ε represent the half-field of view of the signal detection device. Let q be the transformation matrix from the target coordinate system to the optical axis system of the signal detection device. sy =0.

[0014] In a preferred embodiment, S2 includes the following sub-steps:

[0015] S21. Find the intersection point of an ellipse, parabola, or hyperbola with a circle;

[0016] S22. Set the orbital inclination angle to remain constant during flight and obtain the full orbital capture domain based on the intersection point.

[0017] In a preferred embodiment, in S21, the intersection point is obtained based on the instantaneous capture domain boundary of the signal detection device.

[0018] In a preferred embodiment, when the signal detection device is a platform-type signal detection device, the intersection point is represented as follows:

[0019]

[0020] When the signal detection device is a full strapdown signal detection device, the intersection point is represented as:

[0021]

[0022] Where x and z represent the coordinates of the intersection point of the circle and the ellipse or curve.

[0023] In a preferred embodiment, in S22, the inclination angle of the flight trajectory is set to remain constant.

[0024] In a preferred embodiment, when the signal detection device is a platform-type signal detection device, the entire track capture domain is obtained by combining the obtained intersection points:

[0025]

[0026] When the signal detection device is a full strapdown signal detection device, the total track capture domain is obtained by combining the obtained intersection points:

[0027]

[0028] Where θ represents the orbital inclination angle of the aircraft, and α represents the pitch angle of the aircraft.

[0029] The beneficial effects of this invention include:

[0030] (1) Low computational load, which can significantly improve the computational efficiency of the acquisition domain of the signal detection device;

[0031] (2) The accuracy of the acquired signal detection device in capturing the domain results is high. Attached Figure Description

[0032] Figure 1 A flowchart illustrating a method for rapidly acquiring the capture domain of a signal detection device according to a preferred embodiment of the present invention is shown.

[0033] Figure 2 This diagram illustrates the instantaneous acquisition domain in a method for rapidly acquiring the acquisition domain of a signal detection device according to a preferred embodiment of the present invention;

[0034] Figure 3 This illustrates the changing trend of the instantaneous acquisition domain during aircraft flight in a method for rapidly acquiring the acquisition domain of a signal detection device according to a preferred embodiment of the present invention.

[0035] Figure 4 This figure shows a comparison between the simulation results and the actual values ​​of the platform signal detection device in the full track acquisition domain in Example 1;

[0036] Figure 5 The figure shows a comparison between the simulation results and the actual values ​​of the full track acquisition domain of the full strapdown signal detection device in Example 1. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent.

[0038] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0039] According to the present invention, a method for rapidly obtaining the capture domain of a signal detection device is provided, such as... Figure 1 As shown, it includes the following steps:

[0040] S1. Establish the instantaneous acquisition domain boundary of the signal detection device;

[0041] S2. Obtain the full-track acquisition domain of the signal detection device based on the instantaneous acquisition domain.

[0042] The instantaneous acquisition domain of the signal detection device refers to the projection area of ​​the instantaneous field of view of the signal detection device on the ground;

[0043] The full-orbit acquisition domain of the signal detection device refers to the area covered by the instantaneous ground acquisition domain during the flight of the aircraft.

[0044] In S1, the instantaneous acquisition domain boundary of the signal detection device is represented as:

[0045]

[0046] in,

[0047] x t Let z be the x-coordinate of the target in the target coordinate system. t Let x be the height coordinate of the target in the target coordinate system. m Let z be the x-coordinate of the spacecraft in the target coordinate system. m Let R represent the altitude coordinates of the aircraft in the target coordinate system, H represent the effective range of the signal detection device, A, B, and C represent intermediate variables, η represent the relationship between the downward angle and the half-field of view of the signal detection device, and ε represent the half-field of view of the signal detection device. Let q be the transformation matrix from the target coordinate system to the optical axis system of the signal detection device. sy =0.

[0048] As can be seen from the boundary of the instantaneous acquisition domain of the signal detection device, the instantaneous acquisition domain is the area enclosed by the intersection of an ellipse, parabola, or hyperbola and a circle, such as... Figure 2 As shown:

[0049] When η < 1, the instantaneous capture domain is an area where an ellipse and a circle intersect, such as Figure 2 As shown in (a), the center of the ellipse is (x... m -C, 0), with the major and minor semi-axis being Htanε / (1-η), respectively.

[0050] When η = 1, the instantaneous capture domain is the region where a parabola intersects a circle, such as... Figure 2 As shown in (b), the vertex of the parabola is (H / tan2q). sz ,0);

[0051] When η>1, the instantaneous capture domain is the region where one branch of the hyperbola intersects with the circle, such as Figure 2 As shown in (c), the center of the hyperbola is (x... m -C, 0), the effective single branch intersects the x-axis at point C.

[0052] The changing trend of the instantaneous acquisition domain during the flight of the aircraft is as follows Figure 3As shown, taking the instantaneous acquisition domain of the signal detection device as the intersection area of ​​a circle and an ellipse (i.e., η<1) as an example, when the distance between the aircraft and the target is large during the flight of the aircraft, the circle formed by the intersection of the sphere with the effective distance of the signal detection device as the radius and the target plane (referred to as the effective circle) does not intersect with the ellipse formed by the intersection of the cone with the optical axis with the apex angle of the signal detection device as the center axis and the target plane (referred to as the ellipse). At this time, the instantaneous acquisition domain is zero.

[0053] As the aircraft descends, the centers of the action circle and the ellipse move toward the target point. The radius of the action circle increases, the semi-major and semi-minor axes of the ellipse decrease, and the action circle and the ellipse intersect. The intersection area is the instantaneous ground capture domain.

[0054] When the distance between the aircraft and the target is less than a certain value, the ellipse lies within the action circle, and the instantaneous acquisition domain is an elliptical region. During the movement of the guided aircraft, the trajectory of the intersection point of the instantaneous acquisition domain ellipse and the circle is the boundary of the acquisition domain. The same applies when the instantaneous acquisition domain is the region where the circle intersects with the hyperbola (i.e., η = 1, η > 1), and will not be elaborated further.

[0055] S2 includes the following sub-steps:

[0056] S21. Find the intersection point of an ellipse, parabola, or hyperbola with a circle;

[0057] S22. Set the orbital inclination angle to remain constant during flight and obtain the full orbital capture domain based on the intersection point.

[0058] In S21, the intersection point is obtained based on the instantaneous capture domain boundary of the signal detection device.

[0059] When the signal detection device is a platform-type signal detection device, the angle of view of the signal detection device is the track inclination angle, i.e., q. sz =θ, and the intersection point is represented as:

[0060]

[0061] Where x and z represent the coordinates of the intersection point of the circle and the ellipse or curve.

[0062] When the signal detection device is a full strapdown signal detection device, the line-of-sight angle of the signal detection device is the aircraft pitch angle, i.e., q. sz =θ+α, the intersection point is represented as:

[0063]

[0064] Where θ represents the orbital inclination angle of the aircraft, and α represents the pitch angle of the aircraft.

[0065] In existing guidance methods, such as INS / GPS mid-course guidance + laser signal detection device terminal guidance laser, to ensure target acquisition at the terminal stage, a tracking method is generally used before target acquisition, ensuring that the aircraft's velocity direction always points towards the target position. Once the acquisition conditions are met, the aircraft acquires the target and switches to terminal guidance. That is, before target acquisition, the aircraft's velocity direction remains basically unchanged.

[0066] In S22, if the inclination angle of the flight trajectory remains constant, then: H = x m tanθ

[0067] When the signal detection device is a platform-type signal detection device, the entire orbital capture domain is obtained by combining the obtained intersection points:

[0068]

[0069] From the above formula, it can be seen that the full-orbit acquisition domain of the aircraft guided by the platform signal detection device is an ellipse centered on the target point, with a major semi-axis of Rsinε / sinθ and a minor semi-axis of Rsinε. When η>1, the major axis of the acquisition domain Rsinε / sinθ>R, and the maximum value of the acquisition domain to the right of the target (i.e., x>0) should be less than the effective distance of the signal detection device, i.e., x. 2 +z 2 ≤R 2 That is, the capture domain to the right of the target point is the area where the circle with the target point as the center and the effective distance of the signal detection device as the radius intersects with the capture domain ellipse determined by the above formula.

[0070] When the signal detection device is a full strapdown signal detection device, the entire track capture domain is obtained by combining the obtained intersection points:

[0071]

[0072] As shown in the above equation, the entire track acquisition domain of the strapdown signal detection device is an ellipse centered at (Rsinαcosε / sinθ, 0), with a major semi-axis of Rcosαsinε / sinθ and a minor semi-axis of Rsinε. When η>1, the acquisition domain to the right of the target point is the area where a circle centered at the target point and with a radius equal to the effective distance of the signal detection device intersects with the ellipse of the acquisition domain determined by the above equation.

[0073] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this invention disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this invention can be achieved, and this is not limited herein.

[0074] Example

[0075] Example 1

[0076] To conduct a simulation experiment and obtain the capture domain of the signal detection device, the following steps are included:

[0077] S1. Establish the instantaneous acquisition domain boundary of the signal detection device;

[0078] S2. Obtain the full-track acquisition domain of the signal detection device based on the instantaneous acquisition domain.

[0079] In S1, the instantaneous acquisition domain boundary of the signal detection device is represented as:

[0080]

[0081] in,

[0082] S2 includes the following sub-steps:

[0083] S21. Find the intersection point of an ellipse, parabola, or hyperbola with a circle;

[0084] S22. Set the orbital inclination angle to remain constant during flight and obtain the full orbital capture domain based on the intersection point.

[0085] In S21, when the signal detection device is a platform-type signal detection device, the intersection point is represented as follows:

[0086]

[0087] In S22, when the signal detection device is a platform-type signal detection device, the obtained full orbital acquisition domain is:

[0088]

[0089] When the signal detection device is a full strapdown signal detection device, the obtained full track acquisition domain is:

[0090]

[0091] During the simulation, aerodynamic data of a certain type of laser-guided aircraft were used. The initial deployment conditions of the guided aircraft were as follows: deployment altitude 4km, range 12km, initial velocity 250m / s, initial deployment angle 0°, signal detection device range 4km, signal detection device field of view ±15°, and aircraft flight equilibrium angle of attack between 1° and 3°. The aircraft adopted a trajectory scheme of "mid-course guidance maneuver + terminal guidance". After reaching the maneuver point using the tracking guidance law, the aircraft entered the terminal guidance phase, aligning its velocity direction with the target. In the simulation, the maneuver slant range was 6km, and the maneuver angle was -30°.

[0092] Figure 4 The figure shows a comparison between the simulation results and the actual values ​​of the platform signal detection device in the entire orbital acquisition domain. Figure 5A comparison chart showing the simulation results and actual values ​​of the full track acquisition domain of the full strapdown signal detection device is presented.

[0093] from Figure 4 , Figure 5 As can be seen from the results, the results obtained in Example 1 are basically consistent with the true values, indicating that the accuracy of the obtained capture domain is high.

[0094] The present invention has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present invention based on these embodiments, all of which fall within the scope of protection of the present invention.

Claims

1. A method for rapidly obtaining the capture domain of a signal detection device, characterized in that, Includes the following steps: S1. Establish the instantaneous acquisition domain boundary of the signal detection device; S2. Obtain the full-track acquisition domain of the signal detection device based on the instantaneous acquisition domain.

2. The method for rapidly obtaining the capture domain of a signal detection device according to claim 1, characterized in that, In S1, the instantaneous acquisition domain boundary of the signal detection device is represented as: in, x t Let z be the x-coordinate of the target in the target coordinate system. t Let x be the height coordinate of the target in the target coordinate system. m Let z be the x-coordinate of the spacecraft in the target coordinate system. m Let R represent the altitude coordinates of the aircraft in the target coordinate system, H represent the effective range of the signal detection device, A, B, and C represent intermediate variables, η represent the relationship between the downward angle and the half-field of view of the signal detection device, and ε represent the half-field of view of the signal detection device. Let q be the transformation matrix from the target coordinate system to the optical axis system of the signal detection device. sy =0.

3. The method for rapidly obtaining the capture domain of a signal detection device according to claim 1, characterized in that, S2 includes the following sub-steps: S21. Find the intersection point of an ellipse, parabola, or hyperbola with a circle; S22. Set the orbital inclination angle to remain constant during flight and obtain the full orbital capture domain based on the intersection point.

4. The method for rapidly obtaining the capture domain of a signal detection device according to claim 3, characterized in that, In S21, the intersection point is obtained based on the instantaneous capture domain boundary of the signal detection device.

5. The method for rapidly obtaining the capture domain of a signal detection device according to claim 4, characterized in that, When the signal detection device is a platform-type signal detection device, the intersection point is represented as: When the signal detection device is a full strapdown signal detection device, the intersection point is represented as: Where x and z represent the coordinates of the intersection point of the circle and the ellipse or curve.

6. The method for rapidly obtaining the capture domain of a signal detection device according to claim 3, characterized in that, In S22, the inclination angle of the flight trajectory is set to remain unchanged.

7. The method for rapidly obtaining the capture domain of a signal detection device according to claim 6, characterized in that, When the signal detection device is a platform-type signal detection device, the full orbital capture domain is obtained by combining the obtained intersection points: When the signal detection device is a full strapdown signal detection device, the total track capture domain is obtained by combining the obtained intersection points: Where θ represents the orbital inclination angle of the aircraft, and α represents the pitch angle of the aircraft.

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