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| 低轨卫星L频段中继通信载荷技术研究 |
| 刘冕.,赵晖.,胡一皓.,刘才瑞.,薛晟.,王晋阳.,梁显锋 |
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| (1.中国科学院国家空间科学中心,北京 100190;2.中国科学院大学,北京 100049) |
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| 摘要: |
| 针对深远海和陆基间高速率实时数据通信需求，完成了一种应用于低轨卫星的高集成度、低成本、低功耗L频段中继通信载荷的设计和实现。该中继通信载荷将通信天线、射频前端、信号处理单元、电源变换单元和接口单元等集成化设计。接收前端采用有源相控阵天线设计，发射前端设计了GaN功率放大器以提高接收单元獹/T值和发射单元等效全向辐射功率(Effective Isotropic Radiated Power,EIRP)。信号处理单元集成了零中频接收结构和直接射频调制结构，可完成反向链路8Mb/s载荷数据接收解调及前向链路数据处理转发的功能。载荷单机和装星后的环境模拟测试以及星地通信回路模拟测试结果表明，装星载荷可实现L频段卫星通信。整机质量为12.87 kg，在工作温度-25℃～+55℃范围内，发射端功率放大器输出大于30 W时，最大功耗为91.2 W(3.04 A/30 V)。 |
| 关键词: 低轨卫星 L频段中继通信 相控阵天线 |
| DOI：10.20079/j.issn.1001-893x.220624002 |
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| 基金项目:中国科学院战略性先导科技专项（A类）（XDA22000000） |
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| Research on L-band Relay Communication Payload Technology for LEO Satellites |
| LIU Mian,ZHAO Hui,HU Yihao,LIU Cairui,XUE Sheng,WANG Jinyang,LIANG Xianfeng |
| (1.National Space Science Center,Chinese Academy of Science,Beijing 100190,China;2.University of Chinese Academy of Science,Beijing 100049,China) |
| Abstract: |
| To support the real-time high data rates communications between sea and land-based systems,a highly integrated,low-cost and low-power L-band relay communication payload is designed and implemented for low Earth orbit(LEO) satellites.The relay communication payload integrates the communication antenna,radio frequency(RF) front-end,signal processing unit,power conversion unit and interface unit.The receiving front-end is designed with an active phased array antenna,and the transmitting unit is designed with a GaN power amplifier to improve the 獹/T value of the receiving unit and the effective isotropic radiated power(EIRP) of the transmitting unit.The signal processing unit integrates a zero intermediate frequency(IF) receiving structure and a direct RF modulation structure to complete the functions of receiving and demodulating 8 Mb/s data in the reverse link and processing and forwarding data in the forward link.The space environment simulation experiments in individual and followed with the satellite situations are done and the simulation tests of the communications link between the satellite and the ground systems are finished.The payload on board enables L-band satellite communications.Its mass is 12.87 kg and power consumption in more than 30 W RF power is 91.2 W(3.04 A/30 V) in -25 ℃～+55 ℃ conditions. |
| Key words: LEO satellite relay communication phased array antenna |
