CAJ | 학술논문

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1553 B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<13 ms，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<512 ms的要求。
위료제고자외림변성상광보의적계통재궤시간동보정도，제출료채용삼고시종원계산시종표이솔적방법。대광보의적시간계통공작원리진행료분석，이용광보의계통중적1553 B접구심편적시표단원작위삼고시종원，획득련속적양본수거，학정료선성의합계산시종표이솔，실현대시종표이진행동태보상화광보의시간계통우화。급출료기우GPS시종원적실시검측방법，채용고속FPGA심편설계료시간동보계통；응용방진측시설비，기록광보의시간동보오차적동태변화，실현료동태측량우화후적광보의시간동보오차적목적。실험결과표명：우화후적계통실제측량개시시간오차<13 ms，불동측량지속시간하적측량결속오차<466.8 ms，불동적분시간하적측량결속오차<362.5 ms，만족광보의수거반연정도시간계통오차<512 ms적요구。
To improve the time synchronization precision of ultraviolet limb imaging spectrometer, the algorithm of clock drift rate calculation which was based on reference clock source was put forward. Firstly, the principle of limb time system was analyzed, then by using time tag unit of 1553B interface chip as clock reference source, the continual sample data was obtained and clock drift rate based on linear fit was calculated. Lastly, dynamic compensation of clock drift rate and optimization of limb system were realized. With using GPS time synchronization system, time synchronization system of high speed FPGA chip was designed, therefore dynamic changes of limb time synchronization errors were recorded by simulation and test equipment, furthermore limb time synchronization errors were measured dynamically. Time synchronization precision was measured. Experimental results indicate that time synchronization errors are no more than 13 ms for imaging beginning time error , the imaging finish time errors no more than 466.8 ms in different imaging time and no more than 362.5 ms in different integration time, which meets the demand of no more than 512 ms of qualification.