To address communication interference in complex noise environments inside and outside helmets,this study aims to improve the acoustic communication quality of in-helmet systems.A four-element microphone array communication hardware system was designed and implemented for use within the confined space of a helmet.Based on simulations of the internal acoustic field,the system incorporates a set of signal processing techniques,including array beamforming,echo cancellation,stationary noise speech enhancement,non-stationary noise suppression,and automatic gain control,forming a complete voice signal processing framework.Experimental results show that the proposed in-helmet microphone array noise reduction system achieves favorable downlink voice clarity under a total noise level of 85 dB(A),preliminarily validating the effectiveness and applicability of the implemented algorithms.This research provides essential technical and theoretical support for the future design and development of open-form in-helmet communication systems.

During long-term extravehicular activities(EVA),there have been multiple instances of localized discomfort due to cold extremities such as hands and feet.The primary reason is that the design of space suit gloves prioritizes maximizing operational flexibility,which leads to reduced passive thermal protection in certain areas.Insufficient local thermal protection can cause the hands to lose metabolic heat in cold environments over time,resulting in cold stress.Therefore,it is necessary to conduct research on temperature control technology to meet the thermal comfort requirements of astronauts' hands during EVA.Effective active temperature measures can expand the range of low temperature working environments that astronauts' hands can adapt to during EVA,enhance hand thermal comfort,and ensure hand operational capabilities,preventing excessive cold from exceeding medical requirement and affecting extravehicular missions.This paper combines the metabolic heat generation patterns of the human hand to analyze the temperature control requirements for extravehicular gloves,simulate and optimize the layout of electric heaters,and evaluate the feasibility of the electric heating system for extravehicular gloves by building a thermal simulation model.Through prototype vacuum thermal testing,comprehensive verification of the temperature control module for extravehicular gloves was achieved,demonstrating the effectiveness of the temperature control system.