高速偽隨機碼調(diào)制激光測距雷達電子學系統(tǒng)設(shè)計
[Abstract]:With the development of laser technology, embedded technology and integrated optics, laser ranging is developing towards digitalization, automation, low cost and miniaturization. Laser ranging has a series of advantages, such as high measurement accuracy, fast measuring speed, strong anti-interference ability, small volume, light weight and convenient installation and adjustment. It can be used to measure length, distance, speed, time, etc. Its measuring accuracy is 1 to 2 orders of magnitude higher than that of general instruments, and its range of application is more and more extensive, so it is one of the most ideal methods of high precision ranging at present. An electronic system based on high performance FPGA is developed for high speed pseudorandom code modulation laser ranging based on photon counting. In this system, pseudorandom code modulation signals are transmitted, photonic data received, cumulative operations, cross-correlation operations, distance information extracted, encoder pulse counting, Waveform data output and network communication are integrated into Stratix IV series FPGA chips of a single Altera company. At present, the laser technology of 1550nm is very mature, and the repetition rate of laser pulse can reach 10 kHz. In order to adapt to the development of laser technology, the repetition rate of pseudorandom code transmission and photonic data receiving module is up to 10kHz, the modulation rate of pseudorandom code and the sampling frequency of photonic data are up to 1GHz. After 10 accumulations and threshold comparisons, the received symbols are cross-correlated by 1024 parallel identical or logic. The repetition rate of cross-correlation operation and distance information extraction is 1kHz. The field test results of the laboratory and the whole machine show that the system meets the design requirements. The thesis mainly includes five parts: background and significance, system hardware design, system software design and system test. In the first part of the thesis, the laser ranging technology is introduced, and the principle of pseudorandom code modulation laser ranging is introduced and the significance of the topic is analyzed. The second part of the thesis mainly introduces the hardware design of the pseudorandom code modulated laser ranging radar electronic system, mainly introduces the interface design of each function module, according to the function requirement and performance requirement of pseudorandom code modulated laser ranging radar. The hardware design scheme of the system is determined, the selection of the main chips of the system hardware is briefly introduced, and the design of the hardware circuit of each module is introduced. The third part of this paper discusses the design of FPGA logic and Nios II system, which is the key part of this paper. It mainly completes the data acquisition and processing of pseudorandom code modulated laser ranging radar, which is the difficulty of the design. The fourth part of the paper discusses the system test, including the laboratory test and the whole machine field test, and analyzes the test data. Finally, the fifth part of the paper summarizes the results of the paper and points out the shortcomings of the paper.
【學位授予單位】:中國海洋大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN958.98
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