双程数字转发载波测距系统的设计与验证

发布时间：2018-02-01 07:43

本文关键词： 载波测距数字转发载波零值跳变实验平台亚毫米精度　出处：《浙江大学》2013年硕士论文　论文类型：学位论文

【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。
[Abstract]:With the rapid development of micro-satellite formation system, high-precision ranging between satellites has become an important issue. Dual-pass forward carrier ranging system can measure a high precision relative distance value in the carrier wavelength range, and it is simple to realize. It has been preliminarily verified on the existing simulation platform in the way of analog forwarding carrier. Starting from the development direction of dual-pass forward carrier ranging used for absolute distance measurement, and in order to facilitate further research and verification. In this paper, a digital forwarding carrier is proposed to achieve a stable dual-way forward carrier ranging. In this paper, we first verify the dual-pass carrier distance measurement by digital forwarding carrier on the existing digital platform. It is found that there is the same distance zero jump problem as analog forward carrier. This problem is analyzed in detail and the corresponding solution is put forward. At the same time, the factors that affect the ranging performance are analyzed and the corresponding improvement scheme is put forward. According to the proposed scheme, this paper puts forward new requirements for the experimental platform. And according to the needs of dual-pass digital forwarding carrier ranging experimental platform, including hardware platform design and software platform improvement. The hardware platform design is divided into C-band RF board, crystal oscillator board. The design of if filter board and the improvement of if board and S-band RF board. The improvement of software platform includes coherent forwarding mode, digital phase-locked loop parameters, processing bit number. Finally, the experiment platform is tested and verified. Firstly, the function and performance of the hardware experimental platform are verified. Then combined with the software platform to carry out a comprehensive test verification of the dual-pass digital forwarding carrier ranging system, and compared the three causes of the zero-value jump problem to eliminate the zero-value jump phenomenon. The accuracy of ranging is improved by comparing and testing each improvement point of software under the same conditions. Combined with all the test results in this article. It shows that the experimental platform designed in this paper realizes a stable dual-pass relay carrier ranging system by digital forwarding carrier, and the system is used to measure relative distance (zero jump). The distance accuracy of 10 minutes and 11 seconds can reach 36.4um and 20.35umrespectively. For measuring absolute distance (no zero jump), the distance accuracy of 10 minutes and 11 seconds can reach 125.9um and 59.09um, respectively. It meets the requirement of submillimeter precision, and makes preparation for high precision absolute distance measurement combined with pseudo-code ranging system.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P225.2

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