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High - speed short-range pulse ranging system for laser proximity fuze

Author: ChenGuangXin
Tutor: YangHuaJun
School: University of Electronic Science and Technology
Course: Optics
Keywords: Laser proximity fuze Photoelectric conversion Propagation delay method FPGA
CLC: TJ439.2
Type: Master's thesis
Year: 2008
Downloads: 258
Quote: 1
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Abstract


Laser proximity fuze technology is an important technology to improve weapons target damage efficiency. Laser, high-power, high-quality beam quality, strong anti-jamming capability, makes weapons systems with a high hit rate, and therefore play an increasingly important role in the modern warfare. The laser proximity fuze technology is becoming the world's research focus. Laser Fuze distance is very short, high-precision measurement of the distance, which has strict requirements ranging system's processing speed and distance measurement accuracy. For laser proximity fuze ranging system requirements of high-speed, high-precision, air defense weapons and ammunition systems laser proximity fuze background pulse ranging system of high-speed short-range part of photoelectric conversion and signal processing carried out a detailed analysis of research and the design and prototype of indoor and field experiments. The tests showed that this high-speed short-range pulse ranging system can be applied in-air combat weapons laser proximity fuze has important significance for improving the level of China's national defense construction. The main contents are: 1) introduces the principle of pulse laser ranging, short-range pulsed laser ranging equation derivation, and briefly describes the main part of the system and the respective functions. 2) In the photoelectric conversion design, the pulsed laser signal spectrum analysis, to establish the response of the system bandwidth of the front-end analog circuitry, and the silicon-PIN photodetector circuit simulation model for engineering analysis and design. Based on the transistor emitter follower amplifier design to achieve high efficiency of the photoelectric conversion. Simulation and actual test proved pulsed laser ranging system being used in this paper. 3) in the design of machine control and signal processing, it is necessary to achieve the high speed of the target distance, high-precision measurement, must accurately at high speed for timing the start and timing of the end of the time interval measurement. To solve the problem, based on the transfer delay and FPGA (field programmable gate array) working principle of the high-speed ranging technology research, the development of the A to achieve 150ns after the receipt of the sampling pulse timing circuits ranging , ranging in judgment error of ± 0.4m, and the circuit is integrated in a programmable logic device. The method reduces the circuit area and power consumption, and enhanced anti-jamming capability. FPGA chip, laser rangefinder machine control and information processing system, to solve the shortcomings of the phase separation of the the traditional laser rangefinder control system and information processing system, achieve system requirements ranging high-speed and high-precision. 4) of the rangefinder design prototype successfully indoor and field experiments, the test results show that the effective role of the rangefinder distance of 1 ~ 2m, ranging error is ± 0.4m, ranging time is less than 150ns. Meet a laser proximity fuze ranging system of high-speed, high-precision requirements.

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CLC: > Industrial Technology > Arms industry > Ammunition, fuses, pyrotechnics > Fuse > Other fuse > Laser fuze
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