本文關鍵詞： 載波測距 數(shù)字轉發(fā)載波 零值跳變 實驗平臺 亞毫米精度　出處：《浙江大學》2013年碩士論文　論文類型：學位論文

【摘要】：隨著微小衛(wèi)星編隊系統(tǒng)的高速發(fā)展,星間高精度測距已經成為一個重要課題,受到國內外的廣泛關注。雙程轉發(fā)載波測距系統(tǒng)可以測得一個載波波長范圍內高精度的相對距離值,并且實現(xiàn)簡單,已經在已有的模擬平臺上以模擬轉發(fā)載波的方式得到了初步驗證。從雙程轉發(fā)載波測距用于絕對距離測量的發(fā)展方向出發(fā),同時為了方便進一步研究驗證,本文提出以數(shù)字轉發(fā)載波的方式實現(xiàn)穩(wěn)定的雙程轉發(fā)載波測距。 本文首先在已有的數(shù)字平臺上以數(shù)字轉發(fā)載波的方式對雙程轉發(fā)載波測距進行驗證,發(fā)現(xiàn)存在與模擬轉發(fā)載波相同的距離零值跳變問題。文中對該問題進行了詳細地分析并提出了相應的解決方案,同時也分析了影響測距性能的因素并提出了相應的改進方案。根據(jù)提出的方案,本文對實驗平臺提出了新的需求,并根據(jù)需求建立了雙程數(shù)字轉發(fā)載波測距實驗平臺,包括硬件平臺的設計與軟件平臺的改進。硬件平臺設計分為C波段射頻板、晶振板、中頻濾波板的設計和中頻板與S波段射頻板的改進,軟件平臺改進包括相干轉發(fā)方式、數(shù)字鎖相環(huán)參數(shù)、處理位數(shù)、濾波性能等的改進。本文最后對實驗平臺進行了測試驗證,首先驗證了硬件實驗平臺的功能與性能,然后結合軟件平臺對雙程數(shù)字轉發(fā)載波測距系統(tǒng)進行全面測試驗證。對引起距離零值跳變問題的三方面原因進行對比測試消除零值跳變現(xiàn)象,對軟件部分每個改進點都進行相同條件下的對比測試,提升了測距精度。 結合本文所有測試結果,表明本文設計的實驗平臺用數(shù)字轉發(fā)載波的方式實現(xiàn)了穩(wěn)定的雙程轉發(fā)載波測距系統(tǒng)。目前系統(tǒng)單獨用于測量相對距離(有零值跳變),測試時間為10分鐘與11秒時的距離精度分別可以達到36.4um與20.35um；用于測量絕對距離(無零值跳變),測試時間為10分鐘與11秒時的距離精度分別可以達到125.9um與59.09um,滿足了亞毫米精度的指標要求,為與偽碼測距系統(tǒng)結合完成高精度絕對距離的測量作了準備。
[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.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P225.2

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