A star simulator with adjustable magnitude and color temperature for multiple stars

Abstract

The present invention provides a star simulator with adjustable magnitude and color temperature for multiple stars, including an optical telecentric collimation module arranged at the front of the star simulator, a star point position simulation module arranged at the middle of the star simulator, a star point light transmission module and a star point beam coupling module arranged inside the star simulator, and a star point light generation module arranged at the rear of the star simulator; the star point light generation module generates a simulated light source; the star point light generation module is composed of no less than two LED modules and a control circuit, the control circuit modulates the external input electrical signal and outputs it to the LED module, each LED module provides a star point generation source for one star, and the control circuit independently controls the size of the color component of each LED module. A modular design method is adopted to realize the function of online adjustable calibration of star magnitude and color temperature, and the magnitude and color temperature of multiple star points can be simulated, with high star point position accuracy, small magnitude error and high color temperature simulation.

Description

Technical Field

[0001] The invention belongs to the technical field related to aerospace ground optical test equipment, and relates to a multi-star static star simulator which can be used for docking with a star sensor in routine ground tests to realize star magnitude and color temperature simulation. Background Art

[0002] With the improvement of the accuracy of aerospace navigation positioning and the requirements of test items, in order to meet the actual needs of aerospace star sensor detection, it is necessary to develop a star simulator that can detect the actual star magnitude and spectral reception and recognition capabilities of star sensors.

[0003] Traditional star simulators can only simulate the accuracy of star point positions and the angular distance between stars, but cannot simulate the magnitude and spectral type of actual star points. Or they can only simulate the magnitude and spectral type information of a single star, but cannot simulate the distribution of star point positions. Therefore, there is currently no spectral static star simulator in the simulator field that can simultaneously meet the requirements of multiple star positions, multiple star magnitudes, and adjustable color temperature. Summary of the invention

[0004] The present invention solves the above technical problems and adopts a modular design method to achieve the simulation of the magnitudes of multiple stars and star spectra. The magnitudes and color temperatures of multiple stars are adjustable and can be normally identified and extracted by star sensors, thereby greatly improving the detection accuracy of ground detection equipment.

[0005] The present invention provides a static star simulator with a simulation design that can simulate the magnitude and spectrum of multiple star point targets. The device is compact and lightweight, and can accurately calibrate the magnitude and spectrum of the simulator's star points using online adjustable calibration technology to meet high-precision usage requirements. The present invention adopts the following technical solutions:

[0006] A multi-star magnitude and color temperature adjustable star simulator, comprising an optical telecentric collimation module arranged at the front of the star simulator, a star point position simulation module arranged at the middle of the star simulator, a star point light transmission module and a star point light beam coupling module arranged inside the star simulator, and a star point light generation module arranged at the rear of the star simulator;

[0007] The star point light generating module generates a simulated light source, modulates the brightness and color temperature of the light source, and realizes the change of the magnitude and spectral type of the simulated star point; the star point light generating module is composed of no less than two LED modules and a control circuit, the control circuit modulates the external input electrical signal and outputs it to the LED module, each LED module provides a star point generating source for one star, and the control circuit individually controls the size of the color component of each LED module.

[0008] Furthermore, the star point beam coupling module includes an array mounting plate, a coupling connector, and a coupling lens; the array mounting plate is provided with a plurality of mounting holes, the coupling connector is installed therein, a coupling lens is provided inside the coupling connector, one end of the coupling connector is connected to an LED light source, the LED module inputs the light beam into the star point beam coupling module, and the star point beam coupling module couples the light beam and introduces it into the optical fiber for conduction.

[0009] Furthermore, the star point light transmission module includes a fiber optic collimator, a transmission fiber and a fiber optic connector; one end of the fiber optic connector is connected to a coupling connector, and the other end of the fiber optic connector is connected to the transmission fiber. After the light beam passes through the transmission fiber and the fiber optic collimator, it is emitted in the form of collimated light. After the star point light transmission module performs secondary homogenization and collimation on the light beam, it is projected into the star point position simulation module in a collimated manner.

[0010] Furthermore, the star point position simulation module includes a laser precision etched star point plate, a collimator positioning hole plate and a coaxial mounting seat; the collimator empty hole plate is installed inside the coaxial mounting seat, and its porous positions are consistent with the distribution of star point positions etched on the laser precision etched star point plate, the optical fiber collimator is installed in the collimator positioning hole plate, the collimator positioning plate is installed in the coaxial mounting seat, and corresponds one by one to the star point positions distributed on the laser precision etched star point plate, the optical fiber collimator and the laser precision etched star point plate are aligned and fixed according to the star point positions, and the star point position simulation module realizes the simulation of precise star point positions in the sky area.

[0011] Furthermore, the optical telecentric collimation module includes an optical telecentric collimation lens, a focusing ring and an optical attenuation plate group; the optical attenuation group attenuates the illumination of the star points displayed on the laser precision etching plate, the optical telecentric collimation lens projects the star points to infinity for observation by the star sensor, the focusing ring focuses the optical telecentric collimation lens, and the optical telecentric collimation module projects the simulated star points out of the device in the form of infinity.

[0012] The present invention has the following advantages: adopting online adjustable calibration technology to ensure the accuracy of simulated star magnitude and spectral type, breaking through the technical problem that traditional star simulators cannot simulate star magnitude and star spectral type; realizing the simulation of multiple star point targets; the device is compact in size, light in weight, and easy to install and debug. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a multi-star magnitude and color temperature adjustable star simulator of the present invention;

[0014] Figure 2 It is an internal structure diagram of the multi-star magnitude and color temperature adjustable star simulator of the present invention;

[0015] Figure 3 The present invention is a block diagram of the composition of a multi-star magnitude and color temperature adjustable star simulator.

[0016] Among them: 100-optical telecentric collimation module; 101-star point position simulation module; 102-star point light transmission module; 103 star point beam coupling module; 104-star point light generation module; 1-optical telecentric collimation lens; 2-focusing ring; 3-optical attenuation plate group; 4-laser precision etched star point plate; 5-collimator positioning hole plate; 6-coaxial mounting seat; 7-fiber collimator; 8-conduction optical fiber; 9-fiber connector; 10-array mounting plate; 11-coupling connector; 12-coupling lens; 13-LED module; 14-control circuit. DETAILED DESCRIPTION

[0017] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1-Figure 2 As shown: the present invention is a star simulator with adjustable magnitude and color temperature of multiple stars, comprising an optical telecentric collimation module 100 arranged at the front of the star simulator, a star point position simulation module 101 arranged at the middle of the star simulator, a star point light transmission module 102 and a star point beam coupling module 103 arranged inside the star simulator, and a star point light generating module 104 arranged at the rear of the star simulator, wherein the star point light generating module 104 generates a simulated light source, modulates the brightness and color temperature of the light source, and realizes the change of the magnitude and spectrum type of the simulated star point; the star point light generating module 104 is composed of an LED module 13 and a control circuit 14, the control circuit 14 modulates the external input electrical signal and outputs it to the LED module 13, each LED module provides a star point generating source for one star, the control circuit 14 independently controls the size of the color component of each LED module 13, and can accurately calibrate the magnitude and spectrum of the star point of the simulator by online adjustable calibration technology, and the multiple stars with adjustable magnitude and color temperature can be normally identified and extracted by a star sensor.

[0019] The simulator works as follows:

[0020] like Figure 2 and Figure 3As shown: First, the control circuit 14 in the star point light generating module 104 modulates the external input electrical signal and outputs it to the LED module 13. The LED module 13 adopts red, green, blue and white four-color micro light sources and is controlled by the control circuit 14. The control circuit 14 adopts a pulse width modulation design method to achieve brightness adjustment of each monochromatic light source in the LED module. In this embodiment, there are 10 LED modules 13, which can provide star point light generating sources for a total of 10 star points. The number of LED modules and the number of star points can be determined according to actual conditions. Each LED module 13 adopts a red, green, blue and white four-color display method, and the control circuit 14 can independently control the size of the color component of each LED module 13 to achieve the output of the magnitude and spectral type of different star points; the pulse width modulation method is used to adjust the brightness of each monochromatic light source in the LED module 13, and different brightness can be matched, thereby meeting the accurate simulation of the magnitude and color temperature.

[0021] After the LED module 13 in the star point beam coupling module 103 receives the signal from the control circuit 14, the LED module 13 is turned on and the light beam is input into the star point beam coupling module 103. After the light beam is coupled by the coupling lens 12, it is input into the optical fiber for transmission. The two ends of the coupling connector 11 are provided with dedicated interfaces. One end is connected to the LED light source, and the other end is connected to the optical fiber connector 9. The coupling connector is provided with a coupling lens 12 inside, which can couple the LED light beam into the optical fiber. The array mounting plate 10 is provided with 10 "D"-shaped openings to prevent the coupling connector 11 from rotating by itself. When the coupling connector 11 is installed in the array mounting plate 10, it can be firmly locked. The display mounting plate 10 is provided with multiple mounting holes, which can be used to install the coupling connector 11 and prevent it from being damaged by rotation. The LED module 13 inputs the light beam into the star point beam coupling module 103. The star point beam coupling module 103 couples the light beam and introduces it into the optical fiber for transmission.

[0022] The star point light transmission module 102 includes an optical fiber connector 9, a transmission optical fiber 8 and an optical fiber collimator 7. The optical fiber connector 9 is used to connect the transmission optical fiber 8 and the coupling connector 11. After the light beam passes through the transmission optical fiber 8 and the optical fiber collimator 7, it is emitted in the form of collimated light to the star point hole on the laser precision etched star point plate 4 to illuminate the star point. The star point light transmission module 102 performs secondary uniformity and collimation on the light beam, and then projects it into the star point position simulation module 101 with a smaller spot size and collimation.

[0023] The star point position simulation module 101 is provided with a collimator positioning hole plate 5 processed according to the actual star point position, the collimator positioning hole plate 5 is installed inside the coaxial mounting seat 6, and its multi-hole position is consistent with the distribution of the star point position etched on the laser precision etched star point plate 4, the optical fiber collimator 7 can be installed in the mounting hole of the collimator positioning hole plate 5, the optical fiber collimator 7 is installed in the collimator positioning hole plate 5, the collimator positioning plate 5 is installed in the coaxial mounting seat 6, and is consistent with the star point position distributed on the laser precision etched star point plate 4, and the coaxial mounting seat 6 can ensure that the optical fiber collimator 7 and the laser precision etched star point plate 4 are aligned and fixed according to the star point position after centering processing. The star point position simulation module 101 realizes the simulation of the precise star point position in the sky area.

[0024] The optical attenuation sheet group 3 in the optical telecentric collimation module 100 can attenuate the illumination of the star points displayed on the laser precision-etched star point plate 4, and achieve the illumination range of the star magnitude by online adjustable calibration and replacement of attenuation sheets with different transmittances. The optical telecentric collimation lens 1 can project the star points to infinity for observation by the star sensor, and the focusing ring 2 is used as the optical telecentric collimation lens for focusing to ensure that its focal plane is on the plane of the star point plate. The optical telecentric collimation lens 1 adopts an image-side telecentric optical structure to ensure that the star point light simulated by the back-end module in each field of view can completely fill the optical pupil diameter, avoiding the phenomenon of blurred or lost display of the star points in the edge field of view. The optical attenuation sheet group includes multiple groups of correctly calibrated and multi-layer attenuation sheets, which can attenuate the illumination of the occurring star points to the range of the star magnitude. The optical telecentric collimation module 100 projects the simulated star points out of the device in the form of infinity.

[0025] The star simulator can project star point images with position distribution information, magnitude and color temperature information of multiple stars to infinity to provide simulated navigation attitude information for the star sensor.

[0026] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0027] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A multi-star magnitude and color temperature adjustable star simulator, comprising an optical telecentric collimation module (100) arranged at the front of the star simulator, a star point position simulation module (101) arranged at the middle of the star simulator, a star point light transmission module (102) and a star point light beam coupling module (103) arranged inside the star simulator; characterized in that: It also includes a star point light generating module (104) arranged at the rear of the star simulator, wherein the star point light generating module (104) generates a simulated light source, modulates the brightness and color temperature of the light source, and realizes changes in the magnitude and spectrum type of the simulated star point; The star point light generating module (104) is composed of at least two LED modules (13) and a control circuit (14); the control circuit (14) modulates an external input electrical signal and outputs the signal to the LED module (13); each LED module (13) provides a star point generating source for one star; and the control circuit (14) independently controls the size of the color component of each LED module (13); The LED module (13) comprises four monochromatic light sources: red, green, blue and white; and the control circuit (14) uses a pulse width modulation method to adjust the brightness of each monochromatic light source in the LED module (13).

2. The multi-star magnitude and color temperature adjustable star simulator according to claim 1, characterized in that: The star point beam coupling module (103) comprises an array mounting plate (10), a coupling connector (11), and a coupling lens (12); The array mounting plate (10) is provided with a plurality of mounting holes, into which the coupling connector (11) is installed; a coupling lens (12) is provided inside the coupling connector (11); one end of the coupling connector (11) is connected to an LED light source; The LED module (13) inputs a light beam into the star point light beam coupling module (103), and the star point light beam coupling module (103) couples the light beam and then guides the light beam into the optical fiber for conduction.

3. The multi-star magnitude and color temperature adjustable star simulator according to claim 1, characterized in that: The star point optical transmission module (102) comprises an optical fiber collimator (7), a transmission optical fiber (8) and an optical fiber connector (9); One end of the optical fiber connector (9) is connected to a coupling connector (11), and the other end of the optical fiber connector (9) is connected to the transmission optical fiber (8), and the light beam is emitted in the form of collimated light after passing through the transmission optical fiber (8) and the optical fiber collimator (7); The star point light transmission module (102) performs secondary homogenization and collimation on the light beam, and then projects the collimated light beam into the star point position simulation module (101).

4. The multi-star magnitude and color temperature adjustable star simulator as claimed in claim 3, characterized in that: The star point position simulation module (101) comprises a laser precision-etched star point plate (4), a collimator positioning hole plate (5) and a coaxial mounting seat (6); The collimator vacant hole plate (5) is installed inside the coaxial mounting seat (6), and its multi-hole positions are consistent with the distribution of the star point positions etched on the laser precision-etched star point plate (4). The optical fiber collimator (7) is installed in the collimator positioning hole plate (5), and the collimator positioning hole plate (5) is installed in the coaxial mounting seat (6) and corresponds one-to-one with the star point positions distributed on the laser precision-etched star point plate (4). The optical fiber collimator (7) and the laser precision-etched star point plate (4) are aligned and fixed according to the star point positions; The star point position simulation module (101) realizes the simulation of the precise star point position in the sky area.

5. The multi-star magnitude and color temperature adjustable star simulator according to claim 1, characterized in that: The optical telecentric collimation module (100) comprises an optical telecentric collimation lens (1), a focus ring (2) and an optical attenuation sheet group (3); The optical attenuation sheet group (3) attenuates the illumination of the star points displayed on the laser precision-etched star point plate (4), the optical telecentric collimator lens (1) projects the star points to infinity for observation by the star sensor, and the focusing ring (2) focuses the optical telecentric collimator lens (1); The optical telecentric collimation module (100) projects the simulated star point out of the device in the form of infinity.

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