Study on Spacecraft Communication and Ranging technologies over Ultra-Long Distance for Future Jupiter Mission

更好的接收机灵敏度，结合涡轮编码方案的基础上，并通过板载再生操作，提高测距链路的能力是必要的未来木星使命计划将由JAXA进行。在我们的研究中，我们建立并验证了我们的地面站系统模型，以证明我们的新接收机的更好的性能，开发我们的turbo编码电路板，并完成我们的第一个再生测距系统结合我们预先开发的机载转发器模型。地面站模型被构建为一组VME总线系统上的电路板，其包含从A/D转换器到跟随从S波段下变频的IF信号到任何必要的接收器功能（如解调和解码）的所有结。设计了更窄的锁相环载波捕获带宽和稳定的锁相环工作，使得能够在比以往低得多的输入电平下解调残留载波PM调制信号。在输入信噪比为-0.2dB的情况下，从载波捕获到符号同步的硬件损耗小于0.1dB。该输入电平条件对应于CCSDS Turbo编码定义的要求。这意味着我们新开发的接收机工作良好的涡轮编码方案。测距系统作为我们的地面站模型的一部分。这是我们的再生测距方案的第一个演示器，使用我们新的深空应答器，该方案使测距链路提高了15 dB以上。

The better receiver sensitivity, incorporation of turbo coding scheme based on it, and improved ranging link capability through onboard regenerative operation are necessary for the future Jupiter mission program to be conducted by JAXA. In our research, we have built and verified our ground station system model to demonstrate the better performance of our new receiver, to develop our circuit board for turbo coding, and to complete our first regenerative ranging system combining it with our pre-developed onboard transponder model.The ground station model was constructed as a set of circuit board on VME bus system, which contains all the Junctions ranging from A/D converter to follow IF signals down-converted from S-band to any necessary receiver capabilities like demodulation and decoding. Narrower PLL bandwidth in carrier capturing and its stable operation were designed to enable demodulation of residual carrier PM modulation signals at much lower input level than ever. The hardware loss through the carrier acquisition to symbol synchronization was evaluated to be less than 0.1dB with the input of -0.2dB of S/N. This input level condition corresponds to the requirement of CCSDS turbo coding definition. It means that our newly developed receiver works well as one for turbo coding scheme.The ranging system was introduced as a part of our ground station model. It was a first demonstrator of our regenerative ranging scheme, which leads to more than 15 dB improved ranging link with the use of our new deep space transponder.