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为了实现大气湍流参数的实时估计,提出并设计了一种基于FPGA和DSP技术的自适应光学系统在线大气参数测量平台。该测量平台采用FPGA作为前端处理器,在自适应光学系统闭环工作时,利用多通道并行技术和流水线技术从闭环数据高速复原开环泽尼克系数,采用DSP作为后端处理器,根据复原的开环泽尼克系数,利用其编程灵活的特点实现大气相干长度r0、外尺度L0、风速v和相干时间t0的复杂统计运算。最后将该测量平台应用在127单元的自适应光学系统上,以实际天文恒星为观测目标,进行了大气湍流参数的测量。
In order to realize real-time estimation of atmospheric turbulence parameters, an on-line atmospheric parameter measurement platform of adaptive optics system based on FPGA and DSP is proposed and designed. The measurement platform uses FPGA as the front-end processor. When the closed loop of the adaptive optics system works, the open-loop Zernike coefficient is recovered from the closed-loop data at high speed by using multi-channel parallel technology and pipeline technology. The DSP is used as the back- Cyclic Zernike coefficients, the use of its programming flexibility to achieve the complex statistical calculation of atmospheric coherence length r0, outer scale L0, wind speed v and coherence time t0. Finally, the measurement platform was applied to the 127-unit adaptive optics system. With the actual astronomical stars as the observation target, the atmospheric turbulence parameters were measured.