As an important branch of lidar technology, laser 3D imaging technology can be used to detect the outside of the target features, and in the military vehicles, aircraft to be practical application, has been the world’s military attention and recognized. Laser 3D imaging can detect and display the information such as the appearance and outline of the target object, and can be combined with image processing technology, GPS technology, and pattern recognition technology, to finally realize the position and external details of the target object. Compared with the traditional two-dimensional remote sensing and image photography technology, it can more truly and carefully reflect the characteristics of the target object, so the three-dimensional imaging lidar technology has great development prospects. This paper introduces the principle of 3D imaging lidar, working system and the key technology in the development process, and analyzed the development trend and characteristics of 3D imaging lidar, comparing the application of 3D imaging lidar technology at home and abroad, and finally puts forward the development trend of 3D imaging lidar on the airborne platform.
In this paper, several test methods provided in this standard are analyzed, and the influence of the attenuation amount introduced in the test process on the test results of laser divergence angle is analyzed. Considering the test error introduced by attenuation, a method to eliminate this error is proposed, which provides the basis for accurate measurement of divergence angle.
This paper introduces a simulation system for laser remote ranging. The device provides a simulation range of more than 300km, which can realize multiple echo pulses and conduct the test of the verification period maximum range of the remote ranging algorithm. The device accuracy simulates the distance up to 150m, error of 0.9m. The width of the echo pulse can vary depending on the transmission distance and the target characteristics. Considering the simulated distance measurement of the dynamic target, the change of the echo pulse return moment corresponds to the target movement speed, the ranging algorithm of the dynamic target can be verified.
According to the influence of light intensity fluctuation, source and image jitter and beam expansion, the paper studies the following aspects: 1. the maximum ranging equation for small target is analyzed, considering the influence of atmospheric introduction, the key indexes affecting laser remote ranging ability are analyzed; 2. the existing test methods are analyzed and their limitations are put forward; 3. combined with the far field test environment, the improved test method is put forward.
In this paper, a device for fast energy measurement and spot quality measurement for large aperture laser illuminator is designed. The device has compact structure, small volume and high sensitivity. It can quickly test the energy and spot performance of the structural detector on line, and provide a test environment for evaluating the performance index of the structural detector.
This paper presents a retractable infrared laser characteristic fusion target design configuration. In this configuration, the folding mechanism provides the retraction and playback function to drive the simulated target to extend in the length direction, and the extension length can be adjusted according to the background and scene requirements. The simulated target has both infrared and laser characteristics, which can provide a fixed laser reflectivity and cross-sectional area of the characteristic body target. At the same time, the characteristic body target has infrared radiation characteristics of 3~5um and 8~12um bands, respectively, for detection and recognition of high-sensitivity infrared detector, and for the verification of laser range finder's ranging ability.
The wide temperature range measuring equipment introduced in this paper adopts precision multi-spectral optical axis measurement, high and low temperature optics-mechanical compensation and so on. It has the function of debugging and testing the emission optical axis. It has the advantages of advanced technical index, good performance, strong generality, strong expansibility, etc., and can work stably at -40°C~60°C.
The laser anti-collision imaging radar is composed of the following key technologies: high beam quality, high repetition frequency, high power laser shooting machine technology, high sensitivity-high precision receiving technology, high efficiency-fast and linear optical scanning technology, and fast image processing and obstacle recognition and warning technology, etc. This paper studies on the key technology above.
KEYWORDS: Laser applications, Laser systems engineering, Unmanned aerial vehicles, Laser processing, Signal detection, Power supplies, Control systems, Signal processing, Airborne laser technology, Pulsed laser operation
This paper introduced some kind of rapid an accurate detected laser system using on UAV. Composing, function and key technology of this system were discussed. A kind of detected system with character of miniaturization and lightweight was designed. This system can be used on UAV and detect rapidly an accurately.
KEYWORDS: Ranging, Single photon, Signal detection, Optical simulations, Single photon detectors, Detection and tracking algorithms, Interference (communication), Laser systems engineering, Environmental sensing, Laser energy
In this paper, the test environment of all-state single-photon remote detection system established in the laboratory is introduced. In this environment, a noise-free test environment is established, and a quantitative measurement device is established for the sensitivity test of the single-photon receiving system, and the sensitivity test can be carried out without background noise and background noise so as to verify the compliance of the design. And a dynamic target algorithm verification environment is established to test the single-photon dynamic algorithm. The test system is matched with a narrow line-width high-repetition frequency test device, and basically can test the main performance indexes of single-photon, and provides technical support for the design and development of a single-photon remote test system.
In this paper, a comprehensive test environment is designed to simulate one or more enemy laser sources with different characteristics in the laboratory, which can be used to test the main technical specifications of the laser alarm system. The same optical path as the laser source is also the infrared target source, which provides targets with infrared characteristics for tracking and performance measurement of infrared interference systems. At the same time, the environment is dynamic, which can simulate the relative motion of the carrier and the target machine, and investigate the dynamic performance index. The establishment of this environment can test the main performance indexes of laser alarm system and infrared interference system, and can investigate the stability of the index in dynamic environment.
The key technologies involved in airborne wireless laser communication are: high power miniaturized laser design technology, fast acquisition of moving targets, tracking technology, high sensitivity anti-disturbance optical signal receiving technology and so on. In addition, the technologies that need to be considered are pneumatic optical compensation technology, atmospheric channel compensation technology and multi-platform laser communication networking technology. In this paper, the above techniques are studied.
KEYWORDS: Target detection, Single photon, Ranging, Defense and security, Signal detection, Signal to noise ratio, Quantum physics, Quantum information, Laser applications, Defense technologies
In modern war, high-speed moving targets such as fighter planes are the key point to reverse the situation of war. Such targets not only move fast, but also stealth performance is getting better and better. By studying the characteristics of high speed moving stealth target, the key technologies of laser defense against high speed moving stealth target are analyzed from the aspects of quantum imaging and quantum detection, and the problems that need to be studied in each technology are pointed out.
This paper presents a wave front distortion compensation technique applied to single photon ranging system. The key technologies in the design and the expected results are analyzed, which provides the design basis for the remote detection of the single photon ranging system.
In this paper, a testing system is introduced to monitor the beam quality of a laser beam propagating over a long distance. The system consists of a large aperture optical system, a high sensitivity receiving system, a fast signal processing circuit and so on. The laser beam quality propagating 10km can be tested, and the two-dimensional energy distribution, pre-mirror energy density, centroid coordinate and other parameters can be obtained.
In this paper, the key technologies of single photon detection in airborne laser ranging are analyzed. Aiming at the engineering application, we propose the next investigation of single photon detection. 1) the compensation of pulse propagation in atmosphere; 2) the problem of ranging accuracy for moving targets; 3) high accuracy optical axis coherence of receiving and transmitting. Further research can improve the airborne adaptability of single photon ranging system.
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