CN102749625A - Range-gating laser-imaging detection method for cat-eye effect target - Google Patents
Range-gating laser-imaging detection method for cat-eye effect target Download PDFInfo
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- CN102749625A CN102749625A CN2012102224243A CN201210222424A CN102749625A CN 102749625 A CN102749625 A CN 102749625A CN 2012102224243 A CN2012102224243 A CN 2012102224243A CN 201210222424 A CN201210222424 A CN 201210222424A CN 102749625 A CN102749625 A CN 102749625A
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Abstract
The invention provides a range-gating laser-imaging detection method for a cat-eye effect target. According to the range-gating laser-imaging detection method, a 808nm pulsed semiconductor laser is adopted as a lighting source, a synchronization control circuit is used for carrying out synchronization control on gates of the pulsed semiconductor laser and an ICCD (Intensified Charge Coupled Device), the ICCD with the functions of high-speed gating and low-light-level imaging is used for receiving imaged images, stepwise gating imaging can be carried out on an observation area, the cat-eye effect target is subjected to imaging and ranging, and the interference on the cat-eye effect target caused by background noise is reduced. The method is applicable to the detection and the ranging of long-range cat-eye effect targets, and has better practical values and broad application prospects in the fields of optoelectronic countermeasures and laser imaging.
Description
(1) technical field
The present invention relates to technique of laser imaging, is a kind ofly can survey the active optics imaging technique that obtains remote chatoyancy target, belongs to laser imaging field.
(2) background technology
Along with the application of photoelectronic imaging equipment in each system is increasing, just for how to survey and to find that this type systematic provides a kind of new demand.General, the combination of regarding lens and a detector focal plane as that imaging optical system can be similar to is when the collimated laser beam of a branch of incident focuses on the focal plane; Because the focal plane is a plane of reflection; According to the principle of reversibility of light, laser beam can be returned along Yuan Lu, thereby produce power is concentrated, the reflected in parallel light of good directionality; Its light intensity substantially exceeds common diffuse reflection light intensity, " chatoyancy " of Here it is imaging optical system.
Under severe weather conditions such as the light-transfer characteristic difference of distance, atmosphere or back scattering be serious,, be difficult to survey and find target even the low-light level imaging system can not provide enough resolution.Infrared imaging system receives the low restriction of temperature contrast also to have similar problem.In order to overcome above shortcoming, adopt near infrared pulsed laser device and gating ICCD (the CCD camera that has the image intensifying function) to design a kind of range gating laser active imaging system, can the round-the-clock detection of a target.Range gating laser Active Imaging technology can overcome the shortcoming that passive imaging system is influenced by ambient lighting, has characteristics such as imaging is clear, contrast height.
Based on range gating laser imaging chatoyancy object detection method, be a kind of Detection Techniques to remote chatoyancy target.Adopt impulse semiconductor laser that target is belonged to the specific region illumination; Realization is to the detection and the range finding of chatoyancy target, the influence that can overcome that pulses of radiation and echoed signal are transmitted in air path, The atmospheric background radiation, transmitance, scattering and factors such as absorption and turbulent flow produces to illumination imaging initiatively.
(3) summary of the invention
1, purpose: it is near to the present invention is directed to traditional chatoyancy object detection method detection range; During long-range detection; Receive characteristics such as ground unrest interference easily; The illumination of employing impulse semiconductor laser, the storbing gate of synchronization control circuit paired pulses semiconductor laser and ICCD is carried out synchro control, uses the ICCD with high-speed strobe and low-light level imaging function to receive imaging; Can survey and find range particular depth of view chatoyancy target, reduce of the interference of target background noise the chatoyancy target.
2, technical scheme: the present invention has provided a kind of based on range gating laser imaging chatoyancy object detection method, utilizes chatoyancy more specific target to be identified from other target (like complex background etc.).The crucial part of chatoyancy just is that target-echo intensity is far longer than the echo strength of other type target, disturbs but when distance is far away, receive ground unrest easily.Rangerate-gate technique is to utilize pulsed laser and gating video camera; Separate scattered light and the reflected light of target on the different distance with the priority of time; Make by being observed just arrival video camera and the imaging in the time of video camera gating work of pulses of radiation that target reflection is returned; Can reduce the complexity of images acquired, increase the chatoyancy target and extract probability.
The concrete performing step of range gating laser imaging chatoyancy object detection method is:
The first, in laser Active Imaging illumination end, it is that 2 μ s, frequency are the pulse signal of 10KHz that synchronization control circuit generates pulsewidth, driving laser emission laser pulse.
The second, at laser Active Imaging receiving end, synchronization control circuit control gate type ICCD storbing gate opens and closes, and the light pulse of search coverage different distance target reflection is received.
The 3rd, synchronization control circuit calculates the distance of chatoyancy target in the particular depth of view according to the time delay of gating imaging setting.
3, advantage and effect: advantage of the present invention is that synchronization control circuit control gate type ICCD storbing gate opens and closes, and can be carried out to picture to the particular depth of view target, has reduced the background complexity, has reduced the target background noise to the interference from the chatoyancy target.Synchronization control circuit can calculate the distance of chatoyancy target in the particular depth of view according to the time delay of gating imaging setting.
(4) description of drawings
Accompanying drawing 1 is a range gating laser imaging chatoyancy target detection system block diagram.System mainly is made up of laser instrument, ICCD and synchronization control circuit.LASER Light Source is made up of pulsed laser, and the bright dipping of synchronization control circuit control laser instrument, and control ICCD switching are observed the particular depth of view target.
Fig. 1 symbol description is following: 1, semiconductor laser; 2, emission camera lens; 3, chatoyancy target; 4, receive camera lens; 5, ICCD; 6, back-end processing platform; 7 synchronization control circuits.
(5) practical implementation method
The present invention is through synchronization control circuit gating pulse laser instrument emission pulse laser, and synchronization control circuit control ICCD opens and closes, and receives the pulsed light beam that different distance is returned, thereby specific chatoyancy target is observed.
See that Fig. 1 the present invention is a range gating laser imaging chatoyancy object detection method, concrete performing step is:
1. in laser Active Imaging illumination end, it is that 2 μ s, frequency are the pulse signal of 10KHz that synchronization control circuit generates pulsewidth, drives 808nm semiconductor pulse laser emission laser pulse, and search coverage is carried out the step-by-step movement illumination.
2. at laser Active Imaging receiving end, synchronization control circuit control gate type ICCD opens and closes, and the light pulse of search coverage different distance target reflection is received, thereby certain observation zone chatoyancy target is carried out the step-by-step movement search.
3. synchronization control circuit calculates the distance of chatoyancy target in the particular depth of view according to the time delay of gating imaging setting.
Advantage of the present invention is, can survey particular depth of view chatoyancy target, reduced the interference of target background noise to remote chatoyancy target.
Claims (4)
1. one kind based on range gating laser imaging chatoyancy object detection method; It is characterized in that: adopt the 808nm impulse semiconductor laser as lighting source; The storbing gate of synchronization control circuit paired pulses laser instrument and ICCD is carried out synchro control, uses the ICCD with high-speed strobe and low-light level imaging function to receive imaging, can carry out the imaging of step-by-step movement gating to viewing area; The chatoyancy target is carried out to picture and range finding, has reduced the interference of ground unrest the chatoyancy target.It may further comprise the steps:
(1) in laser Active Imaging illumination end, it is that 2 μ s, frequency are the pulse signal of 10KHz that synchronization control circuit generates pulsewidth, drive laser emission laser pulse.
(2) at laser Active Imaging receiving end, synchronization control circuit control gate type ICCD storbing gate opens and closes, and the light pulse of search coverage different distance target reflection is received.
(3) synchronization control circuit calculates the distance of chatoyancy target in the particular depth of view according to the time delay of gating imaging setting.
2. according to claims 1 described range gating laser imaging chatoyancy object detection method, it is characterized in that: adopt the pulse laser of synchronization control circuit control 808nm that remote chatoyancy target is thrown light on.
3. according to claims 1 described range gating laser imaging chatoyancy object detection method, it is characterized in that: at the imaging receiving end, ICCD opens and closes through synchronization control circuit control gate type, thereby different depth of field chatoyancy targets are surveyed.
4. according to claims 1 described range gating laser imaging chatoyancy object detection method, it is characterized in that: synchronization control circuit can calculate the distance of chatoyancy target in the particular depth of view according to the time delay of gating imaging setting.
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| CN103592651A (en) * | 2013-11-21 | 2014-02-19 | 北京理工大学 | Active-passive imaging system for cat eye target detection |
| CN103777193A (en) * | 2014-01-01 | 2014-05-07 | 西安应用光学研究所 | Inverse photoelectric sighting device |
| CN105204032A (en) * | 2015-09-29 | 2015-12-30 | 中国人民解放军装备学院 | Laser detection system for three-dimensional imaging of moving object and imaging method |
| CN106506996A (en) * | 2016-11-11 | 2017-03-15 | 山东大学 | A kind of short-wave infrared imaging system illuminated based on linear array laser and its method of work |
| CN108008408A (en) * | 2017-11-24 | 2018-05-08 | 北京国泰蓝盾科技有限公司 | Search and track imaging method, apparatus and system |
| CN110187356A (en) * | 2019-06-14 | 2019-08-30 | 中国科学技术大学 | Remote super-resolution single photon image reconstructing method |
| CN110297253A (en) * | 2019-07-12 | 2019-10-01 | 南京第五十五所技术开发有限公司 | Enhanced sonar assists range gating Laser Underwater imaging device and method |
| CN112782718A (en) * | 2021-01-04 | 2021-05-11 | 北京环境特性研究所 | Perspective glass imaging method and system based on laser gating |
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| CN106506996A (en) * | 2016-11-11 | 2017-03-15 | 山东大学 | A kind of short-wave infrared imaging system illuminated based on linear array laser and its method of work |
| CN106506996B (en) * | 2016-11-11 | 2019-03-08 | 山东大学 | A kind of short-wave infrared imaging system and its working method based on linear array laser illumination |
| CN108008408A (en) * | 2017-11-24 | 2018-05-08 | 北京国泰蓝盾科技有限公司 | Search and track imaging method, apparatus and system |
| CN110187356A (en) * | 2019-06-14 | 2019-08-30 | 中国科学技术大学 | Remote super-resolution single photon image reconstructing method |
| CN110297253A (en) * | 2019-07-12 | 2019-10-01 | 南京第五十五所技术开发有限公司 | Enhanced sonar assists range gating Laser Underwater imaging device and method |
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