用于卫星入轨段测控的箭载天基测控中继系统

为满足卫星入轨段关键遥测参数下传和遥控指令上传的需求，设计了一种用于卫星入轨段测控的中继系统，方案主要基于火箭现成天基测控终端和卫星现成测控设备。介绍了中继系统的组成、工作原理和工作流程，研究了天基测控相控阵天线波束指向算法，设计了一种卫星遥测、遥控信号中继功能的地面测试系统。该箭载中继系统在快舟一号甲火箭上完成了两次飞行试验验证，两次飞行试验中继转发的卫星遥测数据完整，箭载卫星通信终端接收用户卫星遥测数据的载噪比大于20dB；地面测控中心接收天基遥测返向信号比特信噪比相对接收门限有3dB以上的余量。试验表明，该箭载天基测控中继系统通信链路余量充足，工作可靠，相比通过地面测控资源保障或卫星自身使用天基测控可节省一半以上成本。

Space-based TT & C relay system of launch vehicle during satellite orbit entry

In order to meet the demand of transmitting down the key telemetry parameters and transmitting up the remote control command in the period of satellite orbit entry，a launch vehicle space-based TT & C relay system during satellite orbit entry was designed.The scheme was mainly based on rocket ready-made space-based TT & C terminal and satellite ready-made TT & C equipment.The composition，working principle and workflow of the relay system were introduced，the beam pointing algorithm for space based TT & C phased array antenna was studied，and a kind of ground test system for satellite telemetry relay and remote control communication function was designed.The relay system completed two flight tests in KZ-1A flying commission，the relay forward data of satellite was intact，and the carrier to noise ratio of the satellite communication terminal were all greater than 20dB.The bit signal to noise ratio of space-based telemetry return signal received by ground TT&C center had more than 3dB margins to the receiving threshold.The test shows that the relay system has sufficient communication link margin and reliable operation，which can save more than half of the cost compared with the support of ground TT & C resources or the use of space-based TT & C by the satellite itself.