基于外差檢測原理的絕對測距性能理論研究
[Abstract]:Based on the principle of double optical frequency comb heterodyne, the three key ranging characteristics of long fuzzy distance, high precision and high update rate are perfectly combined, and the measurement performance can meet the needs of many fields, such as aerospace, scientific research and industrial production. However, the pulse time domain width, repetition rate and relative difference of the double optical frequency comb, and the inherent time jitter of the pulse will affect the performance of ranging. Based on the principle of double optical frequency comb heterodyne, this paper makes a comprehensive theoretical analysis, and numerically simulates the data pulse width, repetition frequency difference of double optical frequency comb, chirp parameter, timing noise, etc. The effect of pulse type and other factors on ranging performance. The simulation results show that the Nyquist sampling law has a significant effect on the ranging accuracy. It shows that the choice of data pulse width and repetition frequency difference should strictly meet the Nyquist sampling law. When there is a certain time jitter in femtosecond pulse sequence, the smaller the repetition frequency difference is, the worse the ranging performance is, and the chirp characteristic of pulse can be transformed into the influence of pulse width, and the pulse width is compressed with the increase of chirp. The critical value of repetition difference corresponding to Nyquist sampling frequency will also become smaller. The above numerical analysis provides important guidance for researchers to optimize ranging performance under specific experimental conditions.
【作者單位】: 中國科學(xué)院國家授時中心;中國科學(xué)院大學(xué);
【基金】:國家自然科學(xué)基金(91336108,11273024,61127901);國家自然科學(xué)基金青年科學(xué)基金(11403031) 中科院科技創(chuàng)新“交叉與合作團(tuán)隊”項目(中科院人教字(2012)119號);中科院科研裝備研制項目和中組部“青年拔尖人才支持計劃”(組廳字[2013]33號)項目資助
【分類號】:TN249
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