本项目旨在研究和开发一种能同时满足中层大气探测功能与电离层等离子体探测功能的新体制探测系统，即中层大气-电离层（Middle atmosphere —Ionosphere, MAI）探测系统。该系统基于伪随机码调相脉冲压缩技术，针对中层大气和电离层探测需求，分别采用脉内相位编码和脉间相位编码探测体制，在国际上首次将中层大气探测功能与电离层等离子体探测功能进行一体化设计，可在同一硬件平台上、同一天线阵列上，开展中层大气探测和电离层探测，实现一机多能，不仅可获取中层大气风场信息、电离层探测信息，且可获得从电离层D层到F层的连续电子密度剖面。该系统具有探测模式多样、探测参数多、发射功率小、天线单元体积小、工程造价低等特点，可有效地提高设备功能和应用效率，节约资源。本项目的实现对于深入了解电离层变化、研究中层（低热层）—电离层相互作用和耦合机制及空间天气学研究具有重要科学意义和工程应用价值。

The modern tendency of space exploration technologies aims at the direction of miniaturization, multifunction, automation, systematization and integration. The main target for this proposal is to research and develop a new atmospheric and ionospheric detection system which is called Middle Atmosphere —Ionosphere (MAI) system. Pseudo-random code phase modulation pulse compression technology based on intra-pulse phase encoding and inter-pule phase encoding is utilised. The new system, for the first time, integrates the middle atmospheric detection and ionospheric detection by using one hardware platform and antenna array. This new system is able to observe both the wind field and continuous height profile of electron density. This new system has various detection modes and parameters, low transmitter power, small antenna array, low construction price and fast installation. This project is of great importance for the research of ionospheric changes, coupling of middle atmosphere/ low thermosphere and ionosphere.