【作者】 陈浩；

【导师】 金仲和； 王春晖；

【作者基本信息】 浙江大学 ， 电子与通信工程（专业学位）， 2013， 硕士

【摘要】 随着微小卫星编队系统的高速发展,星间高精度测距已经成为一个重要课题,受到国内外的广泛关注。双程转发载波测距系统可以测得一个载波波长范围内高精度的相对距离值,并且实现简单,已经在已有的模拟平台上以模拟转发载波的方式得到了初步验证。从双程转发载波测距用于绝对距离测量的发展方向出发,同时为了方便进一步研究验证,本文提出以数字转发载波的方式实现稳定的双程转发载波测距。本文首先在已有的数字平台上以数字转发载波的方式对双程转发载波测距进行验证,发现存在与模拟转发载波相同的距离零值跳变问题。文中对该问题进行了详细地分析并提出了相应的解决方案,同时也分析了影响测距性能的因素并提出了相应的改进方案。根据提出的方案,本文对实验平台提出了新的需求,并根据需求建立了双程数字转发载波测距实验平台,包括硬件平台的设计与软件平台的改进。硬件平台设计分为C波段射频板、晶振板、中频滤波板的设计和中频板与S波段射频板的改进,软件平台改进包括相干转发方式、数字锁相环参数、处理位数、滤波性能等的改进。本文最后对实验平台进行了测试验证,首先验证了硬件实验平台的功能与性能,然后结合软件平台对双程数字转发载波测距系统进行全面测试验证。对引起距离零值跳变问题的三方面原因进行对比测试消除零值跳变现象,对软件部分每个改进点都进行相同条件下的对比测试,提升了测距精度。结合本文所有测试结果,表明本文设计的实验平台用数字转发载波的方式实现了稳定的双程转发载波测距系统。目前系统单独用于测量相对距离(有零值跳变),测试时间为10分钟与11秒时的距离精度分别可以达到36.4um与20.35um；用于测量绝对距离(无零值跳变),测试时间为10分钟与11秒时的距离精度分别可以达到125.9um与59.09um,满足了亚毫米精度的指标要求,为与伪码测距系统结合完成高精度绝对距离的测量作了准备。更多还原

【Abstract】 With the rapid development of the formation systems of micro satellites, precision ranging between satellites has become an important topic. Dual-transponder carrier ranging system can be used to measure high precision relative distances and can be simply achieved, and it has been simply validated on the existing analog platform by analog way. In order to measure the absolute distance in the future, and in order for the convenience of further research, the system should be achieved by digital way finally.In this paper, dual-transponder carrier ranging is validated on the existing digital platform at first, and there is a distance initial value changing problem. A detailed analysis of the above problems is carried out and corresponding solutions are put forward, then the factors that affect the ranging performance are analysed and the ways to improve them are introduced. According to the previously proposed solutions, new needs to the experimental platform are raised and new experimental platform for carrier ranging system by digital way is build in this paper, including the design of hardware platform and the improvement of the software platform. At last, the new experimental platform is tested in this paper. Functionality and performance of the hardware platform are verified, then the dual-digital-transponder carrier ranging system is fully tested based on the combination of hardware and software platform, including distance initial value test and precision test.In summary, dual-transponder carrier ranging system is realized stably by digital way in this paper, with elimination of the problems and enhancement of the ranging precision. The final results reach the sub-millimeter precision.更多还原