A target simulator with false alarm function

Abstract

The present invention belongs to the field of optoelectronic product design and relates to a target simulator with a false alarm function. The simulator is mainly used for ground debugging of airborne optoelectronic detection equipment, provides a virtual target source for debugging the optoelectronic detection equipment, and simultaneously increases an interference source. The simulator has a false alarm function and cooperates with the optoelectronic detection equipment to upgrade the false alarm elimination algorithm. The simulator mainly comprises an optical system, an infrared light source, an interference source, a shielding component, a target plate, and a housing component. The simulator is characterized in that one infrared light source forms a target source through a point hole on the target plate to simulate an aerial target, another infrared light source provides a virtual target source through a point hole on the target plate, and a shielding mechanism is installed in front of the target plate. The movement of the shielding mechanism causes the virtual target source to form a flickering target, simulating clouds in the air reflecting sunlight to form a point target that flickers or lasts for a certain period of time for identification by the optoelectronic detection equipment. Therefore, while the target simulator generates a normal point target, it also increases the interference of this type of false alarm target to cooperate with the optoelectronic detection equipment to upgrade the false alarm elimination algorithm.

Description

Technical Field

[0001] The present invention belongs to the field of optoelectronic product design and relates to a target simulator with a false alarm function. The simulator mainly generates a flickering false target source through internal and external interference sources for use in ground debugging of optoelectronic detection equipment. Background Art

[0002] Optoelectronic detection equipment is primarily used for searching and tracking enemy aircraft at long range during air-to-air combat. During ground commissioning, a target simulator is typically used to generate single or multiple point targets to simulate enemy aircraft. During air-to-air searches, clouds can reflect sunlight, creating point targets that flicker or persist for a period of time. Optoelectronic detection equipment may misidentify these targets as enemy aircraft, resulting in false alarms. The false alarm rate is a key metric for evaluating optoelectronic detection equipment. Therefore, during ground commissioning, while generating normal point targets, interference from these false alarm targets is also added to facilitate the upgrade of the optoelectronic detection equipment's false alarm elimination algorithm.

[0003] The target simulator involved in this patent has an operating band of long-wave infrared, and the optical system adopts a refractive-diffractive hybrid configuration. A single-piece zinc selenide objective lens is used to achieve convergent imaging, and the front surface of the primary mirror uses both aspherical and diffractive surfaces to achieve aberration and chromatic aberration elimination. Currently, common target simulators on the market use a Cassegrain total reflection configuration or an off-axis parabolic mirror configuration. The field of view is generally within 1°, and the total cost of materials and processing of optical components is higher, and the requirements for assembly accuracy are high. The refractive-diffractive hybrid optical configuration of this patent has relatively low optical component costs, only about 60%-80% of the reflective system, the field of view can reach 2-3°, and the assembly tolerance is loose.

[0004] The false alarm target involved in this patent is generated by blocking the point holes on the target plate and controlling the blocking duration. The movement of the blocking mechanism is driven by an electromagnet to drive the rotation of the blocking piece. Compared with the general form of motor control, it has the advantages of compact structure and simple control. Summary of the Invention

[0005] The purpose of the present invention is to provide a target simulator with a false alarm function, which provides a variety of false alarm targets in different positions and with different flashing durations, and meets the ground debugging and use requirements of photoelectric detection equipment.

[0006] The technical solution of the present invention:

[0007] A target simulator with a false alarm function comprises an external interference source 1 (1), a shell (2), an upper cover plate 1 (3), an external interference source 2 (4), an upper cover plate 2 (5), a handle component (6), a lens protection cover (7), an external interference source 3 (8), an internal interference source connector (9), an infrared light source connector (10), an indicator light (11), an external interference source connector (12), an internal interference light source (13), a target plate (14), a shielding mechanism component (15), an infrared light source (16), a spectrometer (17), a main mirror (18), and a main mirror pressure ring (19), wherein the shell (2) is a bearing component of the entire target simulator, the upper cover plate 1 (3) and the upper cover plate 2 (5) are mounted on the upper end surface of the shell, the main mirror is mounted on the front end of the shell component and fixed by the main mirror pressure ring (19), and the main mirror pressure ring (19) is designed with a thread on the outside. The main mirror protection cover (7) is installed. The external interference source 1 (1) is installed on the left side of the front end of the shell. The external interference source 2 (4) is installed on the upper cover plate 1 (3) of the front end of the shell. The external interference source 3 (8) is installed on the right side of the front end of the shell. The handle component is installed on the upper cover plate 2 (5). The spectroscope (17) component is installed on the rear end of the shell for splitting. The infrared light source (16) is installed on the bracket on the left side of the spectroscope (17). The internal interference source (13) is installed on the rear side of the spectroscope (17). The square target plate (14) is inserted into the front of the internal interference light source (13) through the hole on the right side of the shell and is tightened and fixed by a spring clamping mechanism. The shielding mechanism (15) is installed on the left side of the internal interference source. The shielding mechanism baffle is located in front of the square target plate. The internal interference source connector (9), the infrared light source connector (10), the indicator light (11), and the external interference source connector (12) are installed on the right side of the shell and connected to the external connector.

[0008] The optical system of the present invention adopts a refraction-diffraction hybrid configuration, uses a single zinc selenide objective lens to achieve convergent imaging, and the front surface of the primary mirror adopts both an aspherical surface and a diffraction surface to eliminate aberration and chromatic aberration.

[0009] The principle of false alarm target generation in the present invention is to control the duration and frequency of light source blocking of the internal interference source target plate point hole through the motion of the blocking mechanism, thereby creating false target sources with different flashing durations. Simultaneously, the housing is inserted into the target plate with different point hole patterns to form false target sources in different positions. Three external interference sources are installed around the primary mirror and serve as fixed false target sources.

[0010] The principle of the shielding mechanism of the present invention is to control the movement of the baffle by using an electromagnet as a driving force. When the electromagnet is energized, the core shaft is forced to move, driving the baffle to rotate a certain angle. When the electromagnet is de-energized, the baffle is reset by the spring force.

[0011] The positioning principle of the square target plate achieved by the present invention is that the U-shaped groove on the bracket is consistent in shape with the end of the square target plate, and is matched with a small gap. The guide groove 1 and the guide groove 2 form a target plate movement channel, guide the square target plate to be inserted into the U-shaped groove, and rely on the spring force of the spring compression mechanism to compress the target plate to fix the target plate.

[0012] The advantages of the present invention are:

[0013] 1. The entire target simulator is compact, miniaturized, and lightweight, weighing only 3.6kg, making it suitable for laboratory and field debugging.

[0014] 2. The target simulator optical system adopts a refractive-diffractive hybrid configuration. Compared with the card-type optical system, the optical component cost is relatively low, only about 60% to 80% of the reflective system. The field of view can reach 2 to 3 degrees, and the installation tolerance requirement is relatively low.

[0015] 3. The target simulator can provide a false alarm function, and target plates with different hole patterns can be replaced according to needs to form different false alarm target sources. By controlling the blocking duration of the blocking structure shield, false alarm target sources with different flickering forms can be formed.

[0016] 4. The shielding mechanism moves by driving the connecting rod through an electromagnet, which has a simple structure and low cost.

[0017] 5. The square target plate is fixed by a spring compression mechanism to ensure the position accuracy of the target plate and facilitate the insertion and removal of the target plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An optical system diagram of an example of the present invention;

[0019] Figure 2 This is a diagram of the external structure of an example of the present invention;

[0020] Figure 3 It is a diagram of the internal structure of an example of the present invention;

[0021] Figure 4 This is a structural diagram of the shielding mechanism of an example of the present invention;

[0022] Figure 5 This is a diagram showing the structure of an internal interference source according to an embodiment of the present invention; DETAILED DESCRIPTION

[0023] The present invention will be further described below through specific examples.

[0024] A target simulator with a false alarm function comprises an external interference source 1 (1), a shell (2), an upper cover plate 1 (3), an external interference source 2 (4), an upper cover plate 2 (5), a handle component (6), a primary mirror protection cover (7), an external interference source 3 (8), an internal interference source connector (9), an infrared light source connector (10), an indicator light (11), an external interference source connector (12), an internal interference light source (13), a square target plate (14), a shielding mechanism component (15), an infrared light source (16), a spectroscope (17), a primary mirror (18), and a primary mirror pressure ring (19).

[0025] like Figure 1 As shown, the optical system of the present invention adopts a refractive-diffractive hybrid configuration. A single zinc selenide objective lens is used to achieve convergent imaging, and the front surface of the primary mirror uses both an aspheric surface and a diffractive surface to achieve aberration and chromatic aberration elimination. The front surface of the primary mirror uses both an aspheric surface and a diffractive surface, and the parameters of the primary mirror are:

[0026] Radius of curvature thickness front surface 265.1mm 12mm rear surface 604.84mm Zinc selenide (ZNSE)

[0027] Front surface aspheric coefficient and diffraction surface coefficient:

[0028] Aspheric parameters c A B C D 1 / 265.1 -1.5586e-9 -1.9982e-14 -2.1781e-19 -4.6084e-24 Diffraction surface parameters C1 C2 C3 Etching depth Refractive index -5.2139e-5 -1.6593e-10 -9.6120e-16 6.373μm 2.412230 (at 9μm)

[0029] Aspheric formula:

[0030]

[0031] Diffraction surface formula:

[0032]

[0033] The above formula is the standard formula in the optical industry.

[0034] like Figure 2 As shown, the shell (2) is the bearing part of the entire target simulator, the upper cover 1 (3) and the upper cover 2 (5) are installed on the upper end surface of the shell, and the handle component is installed on the upper cover 2 (5), which constitutes the shell component of the target simulator.

[0035] like Figure 2 As shown, external interference source 1 (1) is installed on the left side of the front end of the shell, external interference source 2 (4) is installed on the upper cover plate 1 (3) of the front end of the shell, and external interference source 3 (8) is installed on the right side of the front end of the shell, forming three external interference sources on the target simulator.

[0036] like Figure 3The primary mirror (18) is mounted on the front end of the housing component through a mirror seat and fixed by a primary mirror pressing ring (19). The external design of the primary mirror pressing ring (19) is threaded. The primary mirror protective cover (7) is installed. When using the target simulator, the primary mirror protective cover is removed and installed after use.

[0037] like Figure 3 As shown, the spectroscope (17) component is installed at the rear end of the housing, the optical axis of the spectroscope is placed at 45 degrees to the optical axis of the main mirror, the infrared light source (16) is located on the left side of the spectroscope, and the infrared light source point hole is located at the focus of the optical system to ensure clear imaging of the target source.

[0038] like Figure 3 As shown, the internal interference source (13) is installed on the rear side of the spectroscope. The internal interference source component consists of a light source and a bracket. The bracket has a U-shaped groove for installing a square target plate (14). The square target plate is inserted into the front of the internal interference light source through the right side hole of the shell.

[0039] like Figure 4 As shown, the square target plate is inserted into the U-shaped groove of the bracket through the square hole on the right side of the housing. Target plate guide grooves 1 and 2 are installed on the side of the bracket to guide the target plate into the U-shaped groove of the bracket. The spring compression mechanism relies on the spring compression force to press the target plate to prevent it from loosening.

[0040] like Figure 5 As shown, the shielding mechanism is installed on the left side of the internal interference source, and the shielding mechanism baffle is located in front of the target plate. The shielding mechanism relies on the electromagnet as a driving force to drive the baffle to rotate. By controlling the power-on duration and power-on frequency of the electromagnet, the light from the internal interference source through the point hole of the target plate forms a flashing false alarm target source.

[0041] like Figure 2 As shown, the internal interference source connector (9), the infrared light source connector (10), and the external interference source connector (12) are installed on the right side of the housing and connected to the external connector to provide voltage to the light source.

[0042] Parts of the present invention that are not described in detail belong to the well-known technology in the art.

Claims

1. A target simulator with a false alarm function, characterized in that: The target simulator comprises an external interference source 1 (1), a shell (2), an upper cover plate 1 (3), an external interference source 2 (4), an upper cover plate 2 (5), a handle component (6), a primary mirror protective cover (7), an external interference source 3 (8), an internal interference source connector (9), an infrared light source connector (10), an indicator light (11), an external interference source connector (12), an internal interference light source (13), a square target plate (14), a shielding mechanism component (15), an infrared light source (16), a spectrometer (17), a primary mirror (18), and a primary mirror pressure ring (19), wherein the shell (2) is a bearing component of the entire target simulator, the upper cover plate 1 (3) and the upper cover plate 2 (5) are mounted on the upper end surface of the shell, the primary mirror is mounted on the front end of the shell component and fixed by the primary mirror pressure ring (19), the external design of the primary mirror pressure ring (19) is threaded, the primary mirror protective cover (7) is installed, the external interference source 1 (1) The external interference source 2 (4) is installed on the front left side of the shell, the external interference source 3 (8) is installed on the front right side of the shell, the handle component is installed on the upper cover 2 (5), the spectroscope (17) component is installed on the rear end of the shell for splitting, the infrared light source (16) is installed on the left bracket of the spectroscope (17), the internal interference light source (13) is installed on the rear side of the spectroscope (17), the square target plate (14) is inserted into the front of the internal interference light source (13) through the hole on the right side of the shell, and is clamped and fixed by a spring clamping mechanism, the shielding mechanism component (15) is installed on the left side of the internal interference light source, and the shielding mechanism baffle is located in front of the square target plate, the internal interference light source connector (9), the infrared light source connector (10), the indicator light (11), and the external interference source connector (12) are installed on the right side of the shell and connected to the external connector.

2. A target simulator with a false alarm function according to claim 1, characterized in that: The primary mirror is the core component of the target simulator optical system. The optical system adopts a refraction-diffraction hybrid configuration and uses a single zinc selenide objective lens to achieve convergent imaging. The front surface of the primary mirror adopts both an aspheric surface and a diffraction surface to achieve aberration and chromatic aberration elimination.

3. A target simulator with a false alarm function according to claim 1, characterized in that: The external interference source 1, the external interference source 2, and the external interference source 3 are installed in the front of the target simulator to form external interference sources. The three external interference sources all have incandescent lamps as light sources.

4. The target simulator with a false alarm function according to claim 1, wherein: The infrared light source blackbody has a central target plate point hole installed in front of the infrared light source. The infrared light beam is emitted through the point hole, deflected by the beam splitter and passes through the main mirror to form a parallel light beam.

5. The target simulator with a false alarm function according to claim 1, wherein: The internal interference light source is an infrared black body. A square target plate is installed on the front. The target plate is inserted from the side of the shell. Target plates with different point hole forms can be switched as needed.

6. A target simulator with a false alarm function according to claim 1 or 5, characterized in that: The internal interference light source bracket is provided with a pressing mechanism, which presses the target plate by spring force after the square target plate is inserted to prevent the target plate from loosening.

7. The target simulator with a false alarm function according to claim 1, characterized in that: The shielding mechanism's blocking piece is displaced in front of the internal interference light source target plate point hole, and the shielding mechanism controls the movement of the connecting rod mechanism through the extension and contraction of the electromagnet core shaft, thereby generating a flashing light source with different flashing durations.

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