A spaceborne infrared and laser active-passive integrated detection system

Abstract

The application discloses a satellite-borne infrared and laser active-passive integrated detection system, wherein an infrared detection subsystem and a laser ranging subsystem share a main optical system during laser emission and echo reception, the infrared detection and the laser ranging are combined into one system, and the highly integrated infrared and laser active-passive integrated detection system is realized. The application has the advantages that the system integration is higher, multi-dimensional information of a target can be acquired simultaneously, the demand for resources is reduced, the transmission error between axes is reduced, the tracking and aiming precision is improved, and the target measurement of thousands of kilometers can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection, in particular to a spaceborne infrared and laser active-passive integrated detection system. BACKGROUND

[0002] With the development of infrared detection technology, high-sensitivity infrared detection has become one of the main research directions, and has wide application prospects in the fields of infrared imaging, long-distance detection of weak targets, infrared astronomical observation, etc. In the field of long-distance detection of space weak targets, the infrared detection system has obvious advantages. It passively detects the target by collecting the target's infrared radiation signal; the laser ranging system actively emits ranging laser under the guidance of the infrared system, determines the target distance through the return photon signal, and realizes long-distance detection and ranging of weak targets. The traditional integration idea includes using a separate small-aperture optical telescope to transmit laser, and using a large-aperture telescope for return wave reception and infrared imaging. Due to the limitation of the aperture of the separate optical telescope, this scheme cannot realize the transmission of ultra-narrow divergence angle laser beams, and is difficult to apply to fields above 1000 kilometers. In addition, the inter-axis calibration error also limits the accuracy of tracking and sighting, affecting the ranging function.

[0003] Chinese invention patent (publication number CN 114488172 B) A multi-target three-dimensional information rapid acquisition photoelectric detection system has the functions of infrared imaging, search tracking, three-dimensional information acquisition, etc. on the target. In one detection period, it can acquire multi-dimensional information such as space, thermal radiation, distance, etc. of the target, which is convenient for imaging tracking and threat judgment, etc. This patent is applied to the fields of regional alert, airborne ground detection, long-distance reconnaissance and monitoring, etc. and does not involve the detection and measurement of space long-distance weak point targets. The present application is different from it in that: 1) the detected target is a space micro-target (cross-sectional area 1 square meter), 2) the infrared optical system is a deep cryogenic detection system, 3) a low-temperature narrow-band 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) the normal-temperature laser ranging system uses a single-photon detector to receive signals.

[0004] Chinese invention patent (publication number CN 117471438 A) A method for on-orbit calibration of 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 parallelism error of the optical axis caused by factors such as mechanical impact, vacuum, weightlessness, etc., and realizes high-precision tracking and sighting.

[0005] To this end, the application provides a spaceborne infrared and laser active-passive integrated detection system. SUMMARY

[0006] To solve the problems in the prior art, the application provides a spaceborne infrared and laser active-passive integrated detection system.

[0007] The application adopts the technical scheme of the spaceborne infrared and laser active-passive integrated detection system, which comprises a large-aperture main optical system (1), an infrared and laser dichroic filter (2), an infrared detection subsystem, and a laser ranging subsystem.

[0008] The infrared detection subsystem comprises an infrared detection subsystem (3) and an infrared detector (4).

[0009] The laser ranging subsystem comprises a laser emission device (5), a laser receiving subsystem (6), a laser receiving detector (7), and a narrow-band radiation isolation window (8).

[0010] The active-passive integrated detection system is installed on a two-dimensional turntable, the turntable points to a target area, the low-temperature main optical system (1) collects a weak point target signal at a long distance, the infrared signal passes through the infrared and laser dichroic filter (2), is imaged onto the infrared detector (4) through the low-temperature infrared detection subsystem (3), and captures the target signal, the infrared information processing unit extracts multi-band infrared information of the target, the target information refresh rate is 100 Hz, the two-dimensional turntable tracking system is guided to point to the target so that the target falls near the center of the field of view and is stably tracked, the laser emission device (5) emits a ranging laser pulse, passes through the low-temperature narrow-band radiation isolation window (8), is reflected by the infrared and laser dichroic filter (2), the main optical system (1) realizes emission of a laser beam with an ultra-narrow divergence angle, the laser beam irradiates the target, reflected photons are converged through the main optical system (1), pass through the low-temperature narrow-band radiation isolation window (8) to isolate echo interference signals, are reflected by the infrared and laser dichroic filter (2), pass through the laser receiving subsystem (6), and are converged onto the laser receiving single-photon detector (7), and target distance information is obtained through analysis and calculation. The active-passive joint detection is completed, and 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 color separation sheet (2) is made of zinc selenide, and the film is a laser reflection film and an infrared transmission film.

[0012] Further, the infrared detection subsystem (3) is a transmission optical system, and can realize multi-channel light splitting and common-aperture joint detection.

[0013] Further, the main optical system (1) and the infrared detection subsystem (3) are low-temperature detection systems, and the working temperature is 100K; the laser detection system is a normal-temperature system, and the working temperature is 293K.

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

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

[0016] Further, the narrow-band radiation isolation window (8) is made of quartz, and the film is a 532nm narrow-band bandpass filter film, and the working temperature is 100K; the infrared waveband is a high-reflectivity film system, and the reflectivity is greater than 0.9.

[0017] Compared with the prior art, the present application has the beneficial effects that: the present application integrates the spaceborne infrared detection system and the laser ranging system into a main-passive integrated detection system, realizes that the infrared detection subsystem and the laser ranging subsystem share the large-aperture main optical system when laser emission and echo reception, the system integration is higher, multi-dimensional information of the target is acquired at the same time, the demand for resources is reduced, the laser emission and reception share an optical system, the inter-axis transmission error is reduced, and the target measurement of thousands of kilometers is realized. BRIEF DESCRIPTION OF DRAWINGS

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

[0019] Label description: 1. Main optical system, 2. Infrared laser color separation sheet, 3. Infrared detection subsystem, 4. Infrared detector, 5. Laser emission device, 6. Laser receiving subsystem, 7. Laser receiving detector, 8. Narrow-band radiation isolation window. DETAILED DESCRIPTION

[0020] The present application will be further described below in combination with the drawings and embodiments. Figure 1

[0021] Embodiment 1

[0022] As Figure 1 ​As shown, the active and passive integrated detection system comprises a main optical system 1, an infrared laser dichroic filter 2, an infrared detection subsystem 3, an infrared detector 4, a laser emitting device 5, a laser receiving subsystem 6, a laser receiving detector 7, and a narrow-band radiation isolation window 8.

[0023] In the embodiment of the present application, the active and passive integrated detection system is installed on a two-dimensional turntable, the turntable is directed to a target area, the low-temperature main optical system 1 collects a weak point target signal at a long distance, the infrared signal passes through the infrared laser dichroic filter 2, is imaged on the infrared detector 4 through the low-temperature infrared detection subsystem 3, and captures 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, the two-dimensional turntable tracking system is guided to be directed so that the target falls near the center of the field of view and the target is stably tracked, the laser emitting device 5 emits a ranging laser pulse, passes through the low-temperature narrow-band radiation isolation window 8, is reflected by the infrared laser dichroic filter 2, the main optical system 1 realizes emission of a laser beam with an ultra-narrow divergence angle, the laser beam is irradiated on the target, reflected photons are converged through the main optical system 1, pass through the low-temperature narrow-band radiation isolation window 8 to isolate echo interference signals, are reflected by the infrared laser dichroic filter 2, pass through the laser receiving subsystem 6, and are converged on the laser receiving single-photon detector 7, and the target distance information is obtained through analysis and calculation. The active and passive combined detection is completed, and multi-dimensional information of the target is obtained.

[0024] The specific embodiment is only an explanation of the present application, and is not a limitation of the present application, and those skilled in the art can make a modification of the embodiment without creative contribution according to the need after reading the present specification, but as long as the modification is within the scope of the claims of the present application, is protected by the patent law.

Claims

1. A spaceborne infrared and laser active-passive integrated detection system, characterized in that, It comprises a main optical system (1), an infrared laser dichroic filter (2), an infrared detection subsystem and a laser ranging subsystem. The infrared detection subsystem comprises an infrared detection subsystem (3) and an infrared detector (4). The laser ranging subsystem comprises a laser emitting device (5), a laser receiving subsystem (6), a laser receiving detector (7) and a narrow-band radiation isolation window (8). The active and passive integrated detection system is installed on a two-dimensional turntable, the turntable points to a target area, the low-temperature main optical system (1) collects a weak point target signal at a long distance, the infrared signal passes through the red laser dichroic filter (2), is imaged onto the infrared detector (4) by the low-temperature infrared detection subsystem (3), and captures the target signal, the infrared information processing unit extracts the target multi-band infrared information, the target information refresh rate is 100 Hz, the two-dimensional turntable tracking system is guided to point, so that the target falls near the center of the field of view and the target is stably tracked; the laser emitting device (5) emits a ranging laser pulse, passes through the low-temperature narrow-band radiation isolation window (8), is 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, the reflected photons are converged by the main optical system (1), pass through the low-temperature narrow-band radiation isolation window (8), isolate the echo interference signal, pass through the infrared laser dichroic filter (2), pass through the laser receiving subsystem (6), and converge on the laser receiving detector (7), the target distance information is obtained by analysis and calculation, the active and passive joint detection is completed, and multi-dimensional information of the target is acquired.

2. The spaceborne infrared and laser active-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-passive integrated detection system according to claim 1, characterized in that, The infrared laser dichroic filter (2) is made of zinc selenide, and the film coating is a reflective laser and a transmissive infrared spectrum.

4. The spaceborne infrared and laser active-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-passive integrated detection system according to claim 1, characterized in that, The main optical system (1) and the infrared detection subsystem (3) are low-temperature detection systems with a working temperature of 100K, and the laser detection system is a normal-temperature system with a working temperature of 293K.

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

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

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

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