【作者】 赵陆；

【导师】 张洪臣；

【作者基本信息】 长春理工大学 ， 信息与通信工程， 2010， 硕士

【摘要】 本文重点研究提高脉冲激光测距系统测量精度和提高接收系统信噪比两方面内容。在提高测量精度方面,总结各种时间间隔测量方法,重点介绍了时间数字转换芯片TDC-GP2,并且根据该芯片的特点设计高精度时间间隔测量电路。在提高接收系统信噪比方面,提出了采用采样率为2Gsps的超高速A/D转换器和FPGA组成的数字化接收系统。对激光脉冲回波信号进行A/D转换,后利用数字信号处理的方法对回波信号进行处理,来提高信号的信噪比。在算法上采用Haar小波变换域的LMS和整数5/3小波变换来消除系统中噪声。利用MATLAB、DSP Builder和其它相关的EDA工具,在FPGA实现两种算法。同时根据前面的介绍提出两种新的数字化脉冲激光测距系统。更多还原

【Abstract】 This thesis mainly study in two two aspects of the pulse laser distance measurement system that one is to improve the measurement precision and the other is to increase the signal to noise ratio of laser echo pulse.In the part of the measurement precision, it is to sum up many kinds of time interval measurement method and focus on studying in the time-to-digital-converters TDC-GP2.And it designs a high-precision time interval measurement circuit in accordance with the characteristics of TDC-GP2. In the part of increasing the signal to noise ratio of the receiving system, the thesis introduces a new digital receiver system which are formed with ultra-high-speed A / D converter in sampling rate of 2Gsps and FPGA. TO convert laser pulse-echo signals to digital signals in using A / D and then using digital signal processing to increas e signal to noise ratio of laser pulse-echo signals.The algorithms are Haar wavelet transform domain LMS and integer 5/3 wavelet transform, which are using to eliminate system noise. Making use of MATLAB, DSP Builder, and other related EDA tools, FPGA can realise two algorithms. According to the previous presentation, the thesis develop two new digital pulse laser distance measurement system.更多还原