紫外临边成像光谱仪时间同步系统的优化

发布时间：2018-07-03 00:27

本文选题：紫外临边成像光谱仪 + 时间系统　；参考：《红外与激光工程》2014年07期

【摘要】：为了提高紫外临边成像光谱仪的系统在轨时间同步精度,提出了采用参考时钟源计算时钟漂移率的方法。对光谱仪的时间系统工作原理进行了分析,利用光谱仪系统中的1553B接口芯片的时标单元作为参考时钟源,获得连续的样本数据,确定了线性拟合计算时钟漂移率,实现对时钟漂移进行动态补偿和光谱仪时间系统优化。给出了基于GPS时钟源的实时检测方法,采用高速FPGA芯片设计了时间同步系统;应用仿真测试设备,记录光谱仪时间同步误差的动态变化,实现了动态测量优化后的光谱仪时间同步误差的目的。实验结果表明:优化后的系统实际测量开始时间误差13ms,不同测量持续时间下的测量结束误差466.8 ms,不同积分时间下的测量结束误差362.5 ms,满足光谱仪数据反演精度时间系统误差512ms的要求。
[Abstract]:In order to improve the accuracy of time synchronization in the system of ultraviolet edge imaging spectrometer, a method of calculating clock drift rate using reference clock source is proposed. The working principle of the time system of the spectrometer is analyzed. The time scale unit of the 1553B interface chip in the spectrometer system is used as the reference clock source to obtain the continuous sample data and determine the clock drift rate calculated by linear fitting. Dynamic compensation of clock drift and optimization of spectrometer time system are realized. The real-time detection method based on GPS clock source is presented, the time synchronization system is designed by using high speed FPGA chip, and the dynamic change of time synchronization error of spectrometer is recorded by using simulation test equipment. The time synchronization error of the optimized spectrometer after dynamic measurement is realized. The experimental results show that the actual measurement start time error of the optimized system is 13 Ms, the measurement end error under different measurement duration is 466.8 Ms, and the measurement end error under different integral time is 362.5 Ms, which satisfies the precision of data retrieval of spectrometer. System error between the requirements of 512ms.
【作者单位】：中国科学院长春光学精密机械与物理研究所;
【基金】：国家自然科学基金(41105014)
【分类号】：TH744.1

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