【摘要】：為了解決高動態(tài)下對GPS信號快速捕獲的問題,提出了改進的部分匹配濾波(PMF)和快速傅里葉變換(FFT)相結合的粗捕方法,對其原理和結構進行了分析,并針對其引起的扇貝損失和捕獲性能不高的問題,對傳統(tǒng)PMF+FFT方法進行加窗處理;考慮到高動態(tài)下基于擴展卡爾曼跟蹤的方法對捕獲后參數(shù)的精度要求很高,因此在粗捕的基礎上提出了基于線性調(diào)頻Z變換(CZT)算法的精捕方法,并在GPS信號理論模型和模擬高動態(tài)軌跡的基礎上,實現(xiàn)了高動態(tài)GPS數(shù)字中頻信號的生成,為進一步加快捕獲速度,對于冷啟動時提出了一種組合碼相關的衛(wèi)星快速盲搜方法;最后通過MATLAB進行系統(tǒng)仿真實驗,驗證了所提出的高動態(tài)GPS信號粗捕和精捕算法能在加速度為100 g的高動態(tài)環(huán)境下有約10 Hz的捕獲精度。
[Abstract]:In order to solve the problem of fast acquisition of GPS signal in high dynamic condition, an improved coarse capture method combining partial matched filter (PMF) and Fast Fourier transform (FFT) is proposed, and its principle and structure are analyzed. Aiming at the problem of scallop loss and poor capture performance caused by scallop, the traditional PMF FFT method is windowed. Considering that the precision of parameters after acquisition is very high based on extended Kalman tracking under high dynamic conditions, a precision capture method based on linear frequency modulation Z transform (CZT) algorithm is proposed on the basis of coarse trapping. Based on the theoretical model of GPS signal and the simulation of high dynamic trajectory, the generation of high dynamic GPS digital intermediate frequency signal is realized. In order to further accelerate the acquisition speed, a fast blind search method based on combination code correlation is proposed for cold start. Finally, the system simulation experiments with MATLAB show that the proposed coarse and fine capture algorithm of high dynamic GPS signal can capture the accuracy of about 10 Hz in the high dynamic environment with acceleration of 100g.
【作者單位】： 北京微電子技術研究所;
【基金】：核高基重大專項(2009ZX01031-001-014) 中國第二代衛(wèi)星導航系統(tǒng)重大專項(GFZX03030204)~~
【分類號】：TN911.7;P228.4

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