面向火星表面巡视探测的热惯量反演模型及试验验证

A Thermal Inertia Inversion Model for Mars Surface Exploration and Experimental Verification

基于火星表面土壤温度的昼夜周期性变化特性,建立了一种面向火星表面巡视探测的热惯量反演模型,可根据表层不同深度的热电偶测温数据计算被测区域的热惯量,实现表面巡视探测过程中的热惯量在线反演。为验证模型正确性,在地面建立了火星表面热特性试验测试系统,通过对比被测模拟火星土壤的热惯量实际值与模型计算值,验证热惯量反演模型的精度。结果表明,与试验模拟火星土壤的热惯量数值相比,该模型对热惯量的反演误差小于6%,为在线反演火星表面不同土壤地形的热惯量,辅助识别地形可通过性提供了一种可行方法。

Based on the periodicity of day and night variation of soil temperature on the surface of Mars,in order to judge the terrain characteristics and traversability,a thermal inertia inversion model for Martian surface exploration is established.The model can calculate the thermal inertia of the measured area based on the thermocouple temperature measurement data at different surface depths and realize the online thermal inertia inversion during the surface exploration.To verify the model’s accuracy,an experimental test system for the thermal properties of the Martian surface is established on the ground.The accuracy of the thermal inertia inversion model is verified by comparing the actual value of thermal inertia of the measured simulated Martian soil with the calculated value of the model.The results show that the inversion error of the model for thermal inertia is less than 6%compared with the thermal inertia values of the experimental simulated Martian soil,which provides a feasible method for online inversion of the thermal inertia of different soil terrains on the Martian surface to assist in identifying terrain traversiability.