KEYWORDS: Amplifiers, Power supplies, Signal to noise ratio, Sensors, Signal detection, LIDAR, Photodetectors, Interference (communication), Electronics, Signal processing
It is of great significance to detect fast weak optical signal in the field of LiDAR. This article proposes a kind of broadband high-sensitive light pulse detection module that uses two-stage amplified circuit to achieve photoelectric conversion and amplification. The photoelectric detector is AD500-10 avalanche photodiode developed by the First Sensor Corporation. The computing amplifiers are LMH6629 and LTC6268, and the high-voltage power supply is the N1 series ultra-small high-voltage module power of Dongwen Company. The test results show that the module can enlarge the light pulse with the wavelength of 1064 nm, the repetition frequency of 10MHz, the average power of 1nW. The noise peak is about 50mV, and the output pulse width is about 14ns, which can avoid overlapping when the repetition frequency of light pulse is 10MHz.
This paper studies the interception and analysis technology of battlefield photoelectric threat signal based on the principle of photoelectric countermeasure reconnaissance and warning. The designed laser warning signal decoding and identifying experimental system is composed of laser target simulation designator and laser decoding analyzer. Each part includes hardware and control software module, the laser target simulation designator is used to generate the coded laser of semi-active guidance weapon in the specified format, the laser decoding analyzer is used to receive, preprocess, decode, analyze and identify the coded laser signal, obtain and display the laser coding, the closed-loop system can facilitate the experiment of laser warning and the verification research of relevant algorithms.
This paper presents an integrated system for generating and collecting pulse-interval coded laser effectively. The system realize the generation of coded laser with either fixed-frequency or 3-10 bits pulse-intervals, the coded laser is collected and processed by our system using the memory segment technique. The whole system is highly intelligent based on LabVIEW software and potential for laser guided weapons and laser warning systems.
Intensive study on the system noise of infrared detection system in optical satellites could provide an important for the
detection performance research and system design. The source of system noise of the infrared detection system in optical
satellites is analyzed and the models of system noise including electronic noise, background noise and optic system noise
are constructed. Firstly, the electronic noise model is built based by comprehensive analysis of system equivalent power
and scan parameters; then, the earth and atmosphere background noise is established on the basis of the Combined
Atmospheric Radiative Transfer software; lastly, the optic system heat radiation noise is studied using blackbody radiation
theory. On the basis of those models, the electronic noise, background noise and optic system noise are studied, furthermore,
the rule by which the system noise varies according to the changes of temperature and the influence on system noise of
each noise source is studied. The results show that, firstly, the optic system noise could be ignored when the system
temperature blowing 250K; secondly, the electronic noise is the primary source of system noise at 2.7μm and the
background noise is the primary source at 2.7μm and 2.85μm4.19μm.
With the development of electro-optical countermeasure equipment and military combat training needs, we propose to build a comprehensive test system. It analyzes equipment test requirements and system architecture, introduces the general composition and main functions of the comprehensive test system, and discusses the key test contents and test equipment. The integrated test system is convenient for equipment use and support personnel to monitor, evaluate and predict the equipment indicators and state, which is also providing data support for electro-optical countermeasure equipment operation, training, maintenance and management in order to continuously improve the equipment and support technology innovation.
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