本文關鍵詞： 時延估計 大范圍 高精度 自適應迭代 Farrow濾波器　出處：《北京理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：在雷達、聲納及通信等很多領域中，時間延遲是表征信號的重要參量，準確、迅速地估計接收器所接收到的同源信號之間的時間延遲，對距離、速度等相關參量的確定具有十分重要的意義。隨著時延估計在很多領域的廣泛應用，時延估計方法需要更多的考慮各種實際因素，對該技術的研究也呈現出多樣性。一般而言，時延估計的精度要求越高，對算法復雜度的需求就越高，因此在對大范圍時變時延進行精確估計時，就對算法的高效性提出了挑戰(zhàn)。 論文結合自適應算法理論和非整周期延時濾波理論，提出一種針對大范圍時變時延的自適應時延估計方法，，仿真及實現結果表明采用該方法可在使用資源較低的情況下，獲得較快的收斂速度以及幾十皮秒的估計精度。 論文的主要工作如下： 1.研究了自適應算法和非整周期延時濾波的相關理論，結合最小均方誤差自適應算法和Farrow小數延時濾波器結構，提出了一種針對大范圍時變時延的估計方法，給出了Farrow濾波器和自適應迭代算法中相應參數的公式推導，仿真驗證了算法的有效性； 2.基于FPGA設計實現所提方法，給出總體設計及各模塊的詳細設計，Modelsim仿真驗證設計的正確性。
[Abstract]:In many fields, such as radar, sonar and communication, time delay is an important parameter to characterize the signal. It can estimate the time delay and distance between the signals received by the receiver accurately and quickly. It is very important to determine the relative parameters such as velocity. With the wide application of time delay estimation in many fields, more practical factors need to be considered in the time delay estimation method. Generally speaking, the higher the precision of time delay estimation is, the higher the complexity of the algorithm is, so when we estimate the time-varying time delay in a large range accurately. It challenges the efficiency of the algorithm. Based on the theory of adaptive algorithm and the theory of non-integer periodic delay filtering, an adaptive time-delay estimation method is proposed for time-varying delay in a large range. The results of simulation and implementation show that the proposed method can obtain fast convergence speed and estimation accuracy of tens of picoseconds under the condition of low resources. The main work of the thesis is as follows: 1. The relevant theories of adaptive algorithm and non-integer periodic delay filter are studied, combined with the least mean square error adaptive algorithm and the structure of Farrow fractional delay filter. A method for estimating time-varying time delay in a large range is proposed. The formula derivation of the corresponding parameters in the Farrow filter and the adaptive iterative algorithm is given, and the validity of the algorithm is verified by simulation. 2. Based on the proposed method of FPGA design, the overall design and the detailed design of each module are given to verify the correctness of the design.
【學位授予單位】：北京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN713

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