The penetrating depth analysis of Lunar Penetrating Radar onboard Chang'e-3 rover
The penetrating depth analysis of Lunar Penetrating Radar onboard Chang'e-3 rover
复制标题
嫦娥三号月球车探月雷达探测深度分析
DOI：
10.1088/1674-4527/17/5/46
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发表时间：
2017
影响因子：
1.8
通讯作者：
Li Chun-Lai
中科院分区：
文献类型：
--
作者：
Xing Shu-Guo;Su Yan;Feng Jian-Qing;Dai Shun;Xiao Yuan;Ding Chun-Yu;Li Chun-Lai
探月雷达（LPR）在对月球进行原位探测的过程中，成功地获取了大量的科学数据。对目标穿透深度的分析可以帮助确定目标是否在有效探测距离内，并有助于区分有用的回波和噪声。首先，本文介绍了两种传统的方法，都基于雷达传输方程，计算穿透深度。两种方法的区别仅在于前者采用标定报告中给出的系统标定参数，而后者采用高压关断雷达数据。然而，雷达方程需要一些先验知识和假设，假设的准确性将直接影响最终的结果。因此，本研究提出一种新的方法，称为相关系数法（CCM），它只基于雷达数据，没有任何先验假设。CCM可以根据反射回波与噪声之间的不同相关性来获得穿透深度。确切地说，在有用的反射回波中存在强相关性，而在相邻数据道之间的噪声中存在随机相关性。此外，该方法可以获得沿探测器剖面沿着变化的探测深度，而传统方法只能获得单一的深度值。通过仿真，验证了CCM是一种有效的侵彻深度获取方法。本文还对这三种方法的计算结果进行了比较和分析。最后，结果表明，通道1的最终穿透深度和通道2的估计穿透深度范围为136.9 m至165.5 m（
Lunar Penetrating Radar (LPR) has successfully been used to acquire a large amount of scientific data during its in-situ detection. The analysis of penetrating depth can help to determine whether the target is within the effective detection range and contribute to distinguishing useful echoes from noise. First, this study introduces two traditional methods, both based on a radar transmission equation, to calculate the penetrating depth. The only difference between the two methods is that the first method adopts system calibration parameters given in the calibration report and the second one uses high-voltage-off radar data. However, some prior knowledge and assumptions are needed in the radar equation and the accuracy of assumptions will directly influence the final results. Therefore, a new method termed the Correlation Coefficient Method (CCM) is provided in this study, which is only based on radar data without any a priori assumptions. The CCM can obtain the penetrating depth according to the different correlation between reflected echoes and noise. To be exact, there is a strong correlation in the useful reflected echoes and a random correlation in the noise between adjacent data traces. In addition, this method can acquire a variable penetrating depth along the profile of the rover, but only one single depth value can be obtained from traditional methods. Through a simulation, the CCM has been verified as an effective method to obtain penetration depth. The comparisons and analysis of the calculation results of these three methods are also implemented in this study. Finally, results show that the ultimate penetrating depth of Channel 1 and the estimated penetrating depth of Channel 2 range from 136.9 m to 165.5 m (