Satellite-borne infrared and laser active and passive integrated detection system

Abstract

The invention discloses a satellite-borne infrared and laser active and passive integrated detection system, which is characterized in that an infrared detection subsystem and a laser ranging subsystem share a main optical system during laser emission and echo receiving, so that the infrared detection subsystem and the laser ranging subsystem are combined into one system; a highly integrated infrared and laser active and passive integrated detection system is realized. The system has the advantages that the system integration is higher, the multi-dimensional information of the target is acquired at the same time, the resource demand is reduced, the inter-axis transmission error is reduced, the tracking and pointing precision is improved, and thousand-kilometer-level target measurement is realized.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and particularly to a spaceborne infrared and laser active and passive integrated detection system. Background Art

[0002] With the development of infrared detection technology, high-sensitivity infrared detection has become one of the main research directions and has broad application prospects in the fields of infrared imaging, long-distance detection of weak targets, infrared astronomical observation, etc. In the aspect of long-distance detection of weak targets in space, the infrared detection system has obvious advantages. By collecting the infrared radiation signal of the target, it passively detects the target; the laser ranging system actively emits ranging laser under the guidance of the infrared system, and determines the target distance by returning the photon signal, realizing the long-distance detection and ranging of weak targets. The traditional integrated idea includes using a separate small-aperture optical telescope to send laser, and using a large-aperture telescope for echo reception and infrared imaging. This solution cannot achieve the emission of an ultra-narrow divergence angle laser beam due to the limitation of the aperture of the separate optical telescope, and it is difficult to be applied to the field above the level of thousands of kilometers. In addition, the inter-axis calibration error also limits the tracking accuracy and affects the ranging function.

[0003] The Chinese invention patent (publication number CN 114488172 B), a multi-target three-dimensional information rapid acquisition optoelectronic detection system, has functions such as infrared imaging, search and tracking, and three-dimensional information acquisition of the target. In one detection cycle, it can simultaneously obtain multi-dimensional information such as the space, thermal radiation, and distance of the target, which is convenient for imaging and tracking of the target and threat judgment, etc. This patent is applied to the fields of area warning, airborne ground detection, long-distance reconnaissance and monitoring, etc., and does not involve the detection and measurement of spaceborne space long-distance weak and small targets. The differences between the present invention and it are: 1) the detection target is a space micro-target (cross-sectional area of 1 square meter); 2) the infrared optical system is a deep cryogenic detection system; 3) a cryogenic narrowband radiation isolation window is set to isolate the infrared radiation of the normal temperature laser ranging system, reducing the influence on the infrared detection system; 4) for the normal temperature laser ranging system, the laser ranging uses a single-photon detector to receive the signal.

[0004] The Chinese invention patent (publication number CN 117471438 A), an on-orbit calibration method for the optical axis of a space laser ranging system, realizes the on-orbit calibration function of the optical axis of the space laser ranging system, calibrates the optical axis parallelism error caused by factors such as mechanical shock, vacuum, and weightlessness, and realizes high-precision tracking.

[0005] For this purpose, the present invention proposes a spaceborne infrared and laser active-passive integrated detection system. The infrared detection subsystem and the laser ranging subsystem share the main optical system during laser emission and echo reception; the infrared detection and laser ranging subsystems are combined into one system, with higher integration, obtaining multi-dimensional information of the target simultaneously, reducing resource requirements, reducing the axial transfer error, improving the tracking and pointing accuracy, and achieving measurements at longer distances. Summary of the Invention

[0006] In order to solve the problems existing in the above-mentioned prior art, the present invention designs a spaceborne infrared and laser active-passive integrated detection system.

[0007] The technical solution adopted by the present invention is: a spaceborne infrared and laser active-passive integrated detection system, including a large-aperture main optical system (1), an infrared-laser dichroic filter (2), an infrared detection subsystem, and a laser ranging subsystem. The main optical system simultaneously receives the target radiation light and the laser emission echo beam, combining the infrared detection and laser ranging subsystems into one system, realizing a highly integrated active-passive integrated detection system.

[0008] Infrared detection subsystem: including an infrared detection subsystem (3) and an infrared detector (4);

[0009] Laser ranging subsystem: including a laser emission device (5), a laser receiving subsystem (6), a laser receiving detector (7), and a narrowband radiation isolation window (8);

[0010] The active-passive integrated detection system is installed on a two-axis turntable. The turntable points to the target area. The cryogenic main optical system (1) collects the signals of distant weak point targets. The infrared signal passes through the red laser dichroic filter (2) and is imaged onto the infrared detector (4) through the cryogenic infrared detection subsystem (3) to capture the target signal. The infrared information processing unit extracts the multi-band infrared information of the target. The target information refresh rate is 100 Hz, guiding the two-axis turntable tracking system to point, so that the target falls near the center of the field of view and stably tracks the target; the laser emission device (5) emits ranging laser pulses, which pass through the cryogenic narrowband radiation isolation window (8), are reflected by the infrared-laser dichroic filter (2), and the main optical system (1) realizes the emission of a laser beam with an ultra-narrow divergence angle. The laser beam irradiates the target, and the reflected photons are converged by the main optical system (1), pass through the cryogenic narrowband radiation isolation window (8), isolate the echo interference signal, are reflected by the infrared-laser dichroic filter (2), pass through the laser receiving subsystem (6), and are converged onto the laser receiving single-photon detector (7). The target distance information is obtained through analytical calculation. The active-passive joint detection is completed, and the multi-dimensional information of the target is obtained. The main optical system (1) is an off-axis reflective optical system.

[0011] Further, the infrared laser dichroic filter (2) is made of zinc selenide, with a coating that reflects laser light and transmits in the infrared spectral band.

[0012] Further, the infrared detection subsystem (3) is a transmissive optical system that can achieve multi-channel spectral splitting and co-aperture joint detection.

[0013] Further, the main optical system (1) and the infrared detection subsystem (3) are cryogenic detection systems with an operating temperature of 100 K, while the laser detection system is a room-temperature system with an operating temperature of 293 K.

[0014] Further, the laser emission device (5) is a high-power pulsed laser with a laser wavelength of 0.532 μm.

[0015] Further, the laser receiving detector (7) is a single-photon detector.

[0016] Further, the narrowband radiation isolation window (8) is made of quartz, with a coating of a 532 nm narrowband bandpass filter and an operating temperature of 100 K; in the infrared band, it has a high reflectivity film system with a reflectivity greater than 0.9.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention integrates a spaceborne infrared detection system and a laser ranging system into a single active and passive integrated detection system, enabling the infrared detection subsystem and the laser ranging subsystem to share a large-aperture main optical system during laser emission and echo reception. The system has a higher level of integration, can simultaneously obtain multi-dimensional information of the target, reduce resource requirements, and use a single set of optical systems for laser emission and reception, reducing the axial transfer error and achieving target measurement at the thousand-kilometer level. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the composition of a spaceborne infrared and laser active and passive integrated detection system.

[0019] Marking description: 1. Main optical system, 2. Infrared laser dichroic filter, 3. Infrared detection subsystem, 4. Infrared detector, 5. Laser emission device, 6. Laser receiving subsystem, 7. Laser receiving detector, 8. Narrowband radiation isolation window. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following further details the present invention in conjunction with the appended Figure 1 drawings and embodiments:

[0021] Example 1

[0022] As Figure 1As shown in the figure, the active and passive integrated detection system includes a main optical system 1, an infrared laser dichroic filter 2, an infrared detection subsystem 3, an infrared detector 4, a laser emission device 5, a laser reception subsystem 6, a laser reception detector 7, and a narrowband radiation isolation window 8.

[0023] Embodiment of the present invention: The active and passive integrated detection system is installed on a two-dimensional turntable, and the turntable points to the target area. The cryogenic main optical system 1 collects the signals of distant weak point targets. The infrared signals pass through the red laser dichroic filter 2 and are imaged onto the infrared detector 4 through the cryogenic infrared detection subsystem 3 to capture the target signals. The infrared information processing unit extracts the multi-band infrared information of the target. The target information refresh rate is 100 Hz, which guides the two-dimensional turntable tracking system to point, so that the target falls near the center of the field of view and stably tracks the target. The laser emission device 5 emits ranging laser pulses. After passing through the cryogenic narrowband radiation isolation window 8 and being reflected by the infrared laser dichroic filter 2, the main optical system 1 realizes the emission of a laser beam with an ultra-narrow divergence angle. The laser beam irradiates the target, and the reflected photons are converged by the main optical system 1, pass through the cryogenic narrowband radiation isolation window 8 to isolate the echo interference signals, are reflected by the infrared laser dichroic filter 2, pass through the laser reception subsystem 6, and are converged onto the laser reception single-photon detector 7. The target distance information is obtained through analysis and calculation. The active and passive joint detection is completed to obtain the multi-dimensional information of the target.

[0024] This specific embodiment is only an explanation of the present invention and does not limit the present invention. Those skilled in the art can make modifications without creative contributions to this embodiment as needed after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. An on-orbit integrated active and passive detection system combining infrared and laser, characterized in that It includes a main optical system (1), an infrared laser dichroic filter (2), an infrared detection subsystem, and a laser ranging subsystem. The main optical system simultaneously receives the target light and the laser echo beam. Infrared detection subsystem: It includes an infrared detection subsystem (3) and an infrared detector (4). Laser ranging subsystem: It includes a laser emission device (5), a laser receiving subsystem (6), a laser receiving detector (7), and a narrowband radiation isolation window (8). The active and passive integrated detection system is installed on a two-dimensional turntable. The turntable points to the target area. The cryogenic main optical system (1) collects the signals of distant weak point targets. The infrared signal passes through the red laser dichroic filter (2), and is imaged onto the infrared detector (4) through the cryogenic infrared detection subsystem (3) to capture the target signal. The infrared information processing unit extracts the multi-band infrared information of the target. The target information refresh rate is 100 Hz, guiding the two-axis turntable tracking system to point, so that the target falls near the center of the field of view and stably tracks the target. The laser emission device (5) emits ranging laser pulses, which pass through the cryogenic narrowband radiation isolation window (8) and are reflected by the infrared laser dichroic filter (2). The main optical system (1) realizes the emission of a laser beam with an ultra-narrow divergence angle. The laser beam irradiates the target, and the reflected photons are converged by the main optical system (1), pass through the cryogenic narrowband radiation isolation window (8) to isolate the echo interference signal, are reflected by the infrared laser dichroic filter (2), pass through the laser receiving subsystem (6), and are converged onto the laser receiving single-photon detector (7). The target distance information is obtained through analytical calculation to complete the active and passive joint detection and obtain the multi-dimensional information of the target.

2. The spaceborne infrared and laser active and passive integrated detection system according to claim 1, characterized in that The main optical system (1) is an off-axis reflective optical system.

3. The spaceborne infrared and laser active and passive integrated detection system according to claim 1, characterized in that, The infrared laser dichroic filter (2) is made of zinc selenide, and the coating is for reflecting laser and transmitting the infrared spectral band.

4. The spaceborne infrared and laser active and passive integrated detection system according to claim 1, characterized in that, The infrared detection subsystem (3) is a transmissive optical system.

5. The spaceborne infrared and laser active and passive integrated detection system according to claim 1, wherein The main optical system (1) and the infrared detection subsystem (3) are cryogenic detection systems with an operating temperature of 100 K, and the laser detection system is a normal temperature system with an operating temperature of 293 K.

6. The spaceborne infrared and laser active and passive integrated detection system according to claim 1, characterized in that The laser emission device (5) is a high-power pulsed laser with a laser wavelength of 0.532 μm.

7. The spaceborne infrared and laser active and passive integrated detection system according to claim 1, wherein The laser receiving detector (7) is a single-photon detector.

8. The spaceborne infrared and laser active and passive integrated detection system according to claim 1, characterized in that, The narrowband radiation isolation window (8) is made of quartz, and the coating is a 532 nm narrowband band-pass filter film with an operating temperature of 100 K; the infrared band is a high-reflectivity film system with a reflectivity greater than 0.9.

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