二维空间偏振编码信号的同步与译码研究

【作者】 魏凯强；

【导师】 陈延如；

【作者基本信息】 南京理工大学 ， 光学工程， 2010， 硕士

【摘要】 激光驾束制导的核心是激光的编、译码技术。空间偏振编码技术利用光波偏振态在空间分布的差异使光束含有空间位置信息。空间位置的确定需要水平和垂直两个方向的位置信息,二维编码信号的同步传输与区分是空间偏振编、译码技术的难点。介绍了激光驾束制导系统的基本原理,研究了光束空间偏振编、译码技术,提出了一种实现二维偏振编码信号同步传输与译码的方案。采用不同频率的矩形脉冲信号对水平编码器和垂直编码器的驱动电压进行调制,实现了二维偏振编码信号的同步传输。利用带通滤波器完成了二维编码信号的区分。根据空间偏振译码原理和二维同步偏振编码信号的特点,构建了由接收光学系统和信号处理电路组成的接收译码系统。信号处理电路以单片机为系统控制和数据运算的核心,结合滤波器等外围电路实现了二维空间偏振编码信号的译码。在实验室条件下,进行了二维偏振编码信号的区分及译码,并对实验中可能存在的误差做出了分析。实验结果表明二维偏振编码信号的同步与译码方案具有可行性。更多还原

【Abstract】 The core of laser beam-riding guidance is the laser encoding and decoding technology. The spatial polarization encoding technology uses the difference of polarization states in space to make the light contain position information. The determination of spatial position needs both horizontal and vertical information, The synchronous transmission and distinction of two-dimensional encoded signal is the key of laser encoding and decoding technology. The fundamental theory of laser beam-riding guidance is introduced, spatial polarization encoding and decoding technology is studied, a mothod to achieve the synchronous transmission and distinction of two-dimensional encoded signal is present. To achieve the synchronous transmission of two-dimensional signal, rectangular pulse signals with different frequency are used and to modulate the horizontal & vertical encoders’driving voltage. Band-pass filter is used to distinguish the two-dimentional encoded signal. According to the principle of spatial polarization decoding and the characteristics of two-dimensional synchronous encoded signal, the signal receiving and decoding system is set up, including optical receiving system and signal processing circuit. A single chip microcomputer is used as the core chip in the signal processing circuit, it decodes the two-dimentional encoded signal with band-pass filter and other modules. Under the laboratory condition, the two-dimentional encoded signal is decoded, and the system errors possibly existing are analyzed. The results show that the method to synchronously transmit and decode two-dimensional polarization encoded signal is feasible.更多还原